ORCID Profile
0000-0003-2444-2404
Current Organisation
Universidade de São Paulo Instituto de Geociências
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Publisher: Elsevier BV
Date: 09-2019
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 08-1999
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 11-2008
Publisher: Elsevier BV
Date: 05-1995
Publisher: Sociedade Brasileira de Geologia
Date: 12-2008
Publisher: EDP Sciences
Date: 05-2003
DOI: 10.1051/JP4:20030250
Publisher: Geological Society of London
Date: 2008
DOI: 10.1144/SP294.9
Publisher: Elsevier
Date: 2009
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 12-2004
Publisher: Elsevier BV
Date: 03-2005
Publisher: FapUNIFESP (SciELO)
Date: 06-2016
DOI: 10.1590/2317-488920160030285
Abstract: ABSTRACT: The Bambuí Group, the most extensive carbonate-siliciclastic cover on the São Francisco craton, has been a matter of debate because of its potential correlations to global glacial events. Unfortunately, most available chemostratigraphic data came from s les collected on surface rock exposures, ever susceptible to the aggressive chemical weathering that characterizes the southeastern Brazil. On the other hand, we present here high-resolution chemostratigraphic studies based on C, O and Sr isotopic data from 53 s les collected along a weathering-free, continuous, 175 m thick sedimentary succession. This succession was recovered by borehole drilling in the southwestern São Francisco craton, where occur the Carrancas and Sete Lagoas formations, the lowermost units of the Bambuí Group. The drill cores reveal extremely irregular contacts between the basal diamictite and its basement, an Archaean foliated granodiorite. Geochronological and sedimentological data strongly suggest that the diamictite represents a lodgement till. This glaciogenic deposit is covered by a limestone succession which starts with impure carbonates showing aragonite pseudomorph fans and thin bands of black shale. The limestone pile grades to a marl-mudstone interval, which turns to a carbonate with biological components, succeeded by stromatolitic dolomite at the top. C and O isotopic signatures (referred to V-PDB) allow to the sub ision of the lower carbonate-pelite section into three intervals. The first isotopic interval corresponds to a cap carbonate, and displays negative values of δ13C (c . -4‰), and a large oscillation of the δ18O (-6 to -15‰). The Interval II shows a striking homogeneity in δ13C and δ18O, around 1‰ and -7‰, respectively. At the top, Interval III shows a large positive excursion of the δ13C (up to 8‰) and δ18O (-8 to -3‰) values. Unaltered 86Sr/87Sr ratios range from 0.7075 to 0.7077, mainly at the top of the section. The geochemistry of the carbonates is controlled by their terrigenous content (mostly quartz and clay minerals) which is concentrated in the lower units. S les free of terrigenous contamination show Y/Ho ratios ranging from 25 to 50, suggesting a freshwater input during carbonate deposition. It is concluded that the diamictite has a glaciogenic origin and is covered by a cap carbonate. This pair has been identified along the basin and is related to one of the main Neoproterozoic glaciations. Discrepancy between the 86Sr/87Sr values and the global variation curves can be related to freshwater input during the carbonate deposition. Based on the regional tectonic context, the Bambuí Basin may have been a restricted marine basin, totally or partially surrounded by mountain ranges within Gondwana, in the Neoproterozoic/Paleozoic boundary. In its early stages, the sedimentation was influenced by a global glacial event, whose melting phase was responsible by freshwater input in the basin. The gradual rise of the temperature was followed by an increase of the biological activity. Finally, a sudden increase in the biological activity could have been driven by paleogeographic changes caused by the active tectonic.
Publisher: Elsevier BV
Date: 07-2013
Publisher: Elsevier BV
Date: 08-2018
Publisher: Geological Society of London
Date: 2011
DOI: 10.1144/M36.50
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier
Date: 2009
Publisher: Frontiers Media SA
Date: 03-08-2021
DOI: 10.3389/FEART.2021.692895
Abstract: The Ediacaran-Cambrian transition is marked by the ersification of metazoans in the marine realm. However, this is not recorded by the Ediacaran-Cambrian Bambuí Group of the São Francisco basin, Brazil. Containing the sedimentary record of a partially confined foreland basin system, the Bambuí strata bear rare metazoan remnants and a major carbon isotope positive excursion decoupled from the global record. This has been explained by changes in the paleogeography of the basin, which became a restricted epicontinental sea in the core of the Gondwana supercontinent, promoting episodes of shallow water anoxia. Here, we report new δ 15 N bulk data from the two lowermost second-order transgressive-regressive sequences of the Bambuí Group. The results show a rise of δ 15 N values from +2 to +5‰ in the transgressive system tract of the basal sequence, which was deposited when the basin was connected to other marginal seas. Such excursion is interpreted as an oxygenation event in the Bambuí sea. Above, in the regressive systems tract, δ 15 N values vary from +2 to +5‰, pointing to instabilities in the N-cyle that are concomitant with the onset of basin restrictions, higher sedimentary supply/accommodation ratios, and the episodic anoxia. In the transgressive systems tract, the δ 15 N values stabilise at ∼+3.5‰, pointing to the establishment of an appreciable nitrate pool in shallow waters in spite of the basin full restriction as marked by the onset of a positive carbon isotope excursion. In sum, our data show that the N-cycle and its fluctuations were associated with variations in sedimentary supply/accommodation ratios induced by tectonically-related paleogeographic changes. The instability of the N-cycle and redox conditions plus the scarcity of nitrate along regression episodes might have hindered the development of early benthic metazoans within the Bambuí seawater and probably within other epicontinental seas during the late Ediacaran-Cambrian transition.
Publisher: Wiley
Date: 26-01-2022
DOI: 10.1111/GGR.12413
Abstract: This study has determined the trace element and the U‐Pb, Sm‐Nd and Sr‐Sr isotope composition of the Sumé apatite (from NE Brazil) to assess its suitability as a primary/secondary reference material for LA‐ICP‐MS. Reproducibility tests demonstrate that one batch (~ 100 g) of the Sumé apatite (Sumé‐570) is uniform in terms of Nd‐Nd and U‐Pb isotope compositions. Bulk isotope dilution TIMS/ICP‐MS and LA‐MC‐ICP‐MS analyses confirm that the apatite is well suited for use as quality control material for Nd isotopes and U‐Pb geochronology. U‐Pb ID‐TIMS analyses yield weighted mean ratios of 0.09211 ± 0.00053 (2 s 206 Pb*/ 238 U) and 0.06120 ± 0.00063 (2 s 207 Pb*/ 206 Pb*) and a weighted mean 206 Pb*/ 238 U date of 568 ± 3 Ma (95% c.l.). U‐Pb LA‐(SF/MC)‐ICP‐MS runs using Sumé‐570 as a primary RM and reproduces the dates of other established RMs within 1% deviation (except for Durango 2–4%). Major and trace element abundances show that Sumé‐570 is a fluorapatite derived from a syenitic source. It also strongly shows LREE‐enriched chondrite‐normalised REE patterns with significant negative Eu anomalies, due to crystallisation of plagioclase in the residue.
Publisher: Elsevier BV
Date: 03-2012
Publisher: Geological Society of London
Date: 2011
DOI: 10.1144/M36.49
Publisher: Geological Society of London
Date: 2011
DOI: 10.1144/M36.46
Publisher: Elsevier BV
Date: 04-2013
Publisher: Elsevier
Date: 2019
Publisher: Elsevier BV
Date: 04-2007
Publisher: Elsevier BV
Date: 11-2020
Publisher: Geological Society of London
Date: 2011
DOI: 10.1144/M36.45
Publisher: Wiley
Date: 10-2009
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 10-2001
Publisher: Elsevier BV
Date: 08-2018
Publisher: Wiley
Date: 04-03-2021
DOI: 10.1111/GBI.12438
Abstract: Microbial activity is often invoked as a direct or indirect contributor to the precipitation of ancient chemical sedimentary rocks such as Precambrian iron formations (IFs). Determining a specific metabolic pathway from the geological record remains a challenge, however, due to a lack of constraints on the initial conditions and microbially induced redox reactions involved in the formation of iron oxides. Thus, there is ongoing debate concerning the role of photoferrotrophy, that is the process by which inorganic carbon is fixed into organic matter using light as an energy source and Fe(II) as an electron donor, in the deposition of IFs. Here, we examine ~2.74‐Ga‐old Neoarchean IFs and associated carbonates from the Carajás Mineral Province, Brazil, to reconstruct redox conditions and to infer the oxidizing mechanism that allowed one of the world's largest iron deposits to form. The absence of cerium (Ce) anomalies reveals that conditions were pervasively anoxic during IF deposition, while unprecedented europium (Eu) anomalies imply that Fe was supplied by intense hydrothermal activity. A positive and homogeneous Fe isotopic signal in space and time in these IFs indicates a low degree of partial oxidation of Fe(II), which, combined with the presence of 13 C‐depleted organic matter, points to a photoautotrophic metabolic driver. Collectively, our results argue in favor of reducing conditions during IF deposition and suggest anoxygenic photosynthesis as the most plausible mechanism responsible for Fe oxidation in the Carajás Basin.
Publisher: American Chemical Society (ACS)
Date: 18-11-2008
DOI: 10.1021/AC8019587
Abstract: We developed an analytical method and constrained procedural boundary conditions that enable accurate and precise Zn isotope ratio measurements in urban aerosols. We also demonstrate the potential of this new isotope system for air pollutant source tracing. The procedural blank is around 5 ng and significantly lower than published methods due to a tailored ion chromatographic separation. Accurate mass bias correction using external correction with Cu is limited to Zn s le content of approximately 50 ng due to the combined effect of blank contribution of Cu and Zn from the ion exchange procedure and the need to maintain a Cu/Zn ratio of approximately 1. Mass bias is corrected for by applying the common analyte internal standardization method approach. Comparison with other mass bias correction methods demonstrates the accuracy of the method. The average precision of delta(66)Zn determinations in aerosols is around 0.05 per thousand per atomic mass unit. The method was tested on aerosols collected in Sao Paulo City, Brazil. The measurements reveal significant variations in delta(66)Zn(Imperial) ranging between -0.96 and -0.37 per thousand in coarse and between -1.04 and 0.02 per thousand in fine particular matter. This variability suggests that Zn isotopic compositions distinguish atmospheric sources. The isotopic light signature suggests traffic as the main source. We present further delta(66)Zn(Imperial) data for the standard reference material NIST SRM 2783 (delta(66)Zn(Imperial) = 0.26 +/- 0.10 per thousand).
Publisher: FapUNIFESP (SciELO)
Date: 2018
Publisher: FapUNIFESP (SciELO)
Date: 03-2014
Publisher: Elsevier BV
Date: 07-1995
Publisher: SAGE Publications
Date: 05-2009
Abstract: A 72 cm long core was collected from Lagoa da Viração (LV), a small pond in the Fernando de Noronha island, northern Brazil. Sediments from the lower section of the core (20—72 cm depth) contain essentially mineral matter, while in the upper section (0—20 cm depth) mineral matter is mixed with organic matter. Lithogenic conservative elements — Si, Al, Fe, Ti, Co, Cr, Cu, Ba, Ga, Hf, Nb, Ni, Y, V, Zn, Zr and REE — exhibit remarkably constant values throughout the core, with concentrations similar to those of the bedrock. The vertical distribution of soluble elements — Ca, Mg, Na, K, P, Mn and Sr — is also homogeneous, but these elements are systematically depleted in relation to the bedrock. LOI, TOC, Br, Se, Hg and Pb, although showing nearly constant values in the lower section of the core, are significantly enriched in the upper section. The concentration profiles of Br and Se suggest that they may be accounted for by natural processes, related to the slight affinity of these elements for organic matter. On the other hand, the elevated levels of Hg and Pb in recent sediments may be explained by their long-range atmospheric transport and deposition. Furthermore, the isotopic composition of Pb clearly indicates that anthropogenic sources contributed to the Pb burden in the uppermost pond sediments.
Publisher: Elsevier BV
Date: 04-2015
Publisher: Sociedade Brasileira de Geologia
Date: 12-2005
Publisher: FapUNIFESP (SciELO)
Date: 09-2013
Publisher: Elsevier BV
Date: 12-2021
Publisher: Springer Science and Business Media LLC
Date: 23-06-2021
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 04-1995
Publisher: Elsevier BV
Date: 02-2000
Publisher: FapUNIFESP (SciELO)
Date: 2012
Publisher: Elsevier BV
Date: 11-2010
Publisher: Elsevier BV
Date: 04-2018
Publisher: FapUNIFESP (SciELO)
Date: 2008
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 03-1999
Publisher: Wiley
Date: 21-07-2007
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 2004
Publisher: Elsevier BV
Date: 04-2018
Publisher: FapUNIFESP (SciELO)
Date: 2020
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 07-1995
Publisher: Universidade de Sao Paulo, Agencia USP de Gestao da Informacao Academica (AGUIA)
Date: 12-2013
Publisher: Elsevier BV
Date: 07-1995
Publisher: Wiley
Date: 10-08-2022
DOI: 10.1111/GGR.12444
Abstract: The Khan River (Namibia) and Bear Lake (Canada) titanites are investigated as potential reference materials (RM) for LA‐ICP‐MS applications. The Bear Lake titanite is texturally and compositionally homogeneous. The Khan River titanite is texturally heterogeneous and characterised by variable trace element compositions and total rare earth element contents. However, both titanites have consistent U‐Pb and Nd‐isotope ratios. U‐Pb isotope dilution‐thermal ionisation mass spectrometry analyses yielded Pb c ‐uncorrected intercept ages of 516.3 ± 1.3 Ma (2 s , n = 5, MSWD = 2.4) and 1067.81 ± 0.74 Ma (2 s , n = 4, MSWD = 0.35) for Khan River and Bear Lake titanites, respectively. Multiple U‐Pb LA‐SF/MC‐ICP‐MS analyses gave consistent Pb c ‐uncorrected intercept ages for both, Khan River (517 ± 1/5 Ma, 2 s , n = 262, MSWD = 1.5) and Bear Lake (1070 ± 1/11 Ma, 2 s , n = 325, MSWD = 0.88). U‐Pb SHRIMP analyses on the same material returned identical (within uncertainty) ages. Khan River and Bear Lake gave internally consistent solution MC‐ICP‐MS 143 Nd/ 144 Nd ratios of 0.511587 ± 0.000027 (2 s , n = 2) and 0.512321 ± 0.000004 (2 s , n = 2), respectively. The 143 Nd/ 144 Nd ratios via solution‐MC‐ICP‐MS and LA‐ICP‐MS all agree within uncertainty and suggest that both titanites can be used as RMs for Nd‐isotope analyses.
Publisher: Elsevier BV
Date: 11-2020
Publisher: FapUNIFESP (SciELO)
Date: 03-2013
Publisher: Elsevier BV
Date: 02-2012
Publisher: Elsevier BV
Date: 07-2020
Publisher: Springer Science and Business Media LLC
Date: 26-06-2009
Publisher: Geochimica Brasiliensis
Date: 21-12-2020
DOI: 10.21715/GB2358-2812.2020342130
Abstract: Zinc isotopes ratios provide qualitative and quantitative information about contributions from different Zn sources in the environment. Here we present the results of a preliminary study to identify the main sources controlling Zn isotope signatures of sediments from Lake Paranoá (Brazil), an urban water reservoir. The Zn isotope ratios were measured by MC-ICP-MS and expressed as δ66/64Zn notation relative to the JMC 3-0749-L solution. The studied sediments showed a narrow isotopic range (+0.00 to +0.13 ‰ n = 10) similar to that reported for intensely weathered soils worldwide (from -0.4 to +0.2‰). The geoaccumulation index (Igeo) also suggests low or negligible influence of Zn anthropogenic source. This research provides a baseline assessment of the Zn isotopes signatures in lake sedimentary environments under the influence of these weathered soils.
Publisher: Frontiers Media SA
Date: 16-04-2021
DOI: 10.3389/FENVS.2021.623915
Abstract: Urban air pollution is a matter of concern due to its health hazards and the continuous population growth exposed to it at different urban areas worldwide. Nowadays, more than 55% of the world population live in urban areas. One of the main challenges to guide pollution control policies is related to pollutant source assessment. In this line, U.S. Environmental Protection Agency's Positive Matrix Factorization (EPA-PMF) has been extensively employed worldwide as a reference model for quantification of source contributions. However, EPA-PMF presents issues associated to source identification and discrimination due to the collinearities among the source tracers. Multi-Isotopic Fingerprints (MIF) have demonstrated good resolution for source discrimination, since urban sources are characterized by specific isotopic signatures. Source quantification based on total aerosol mass is the main limitation of MIF. This study reports strategies for PMF and MIF combination to improve source identification/discrimination and its quantification in urban areas. We have three main findings: (1) cross-validation of PMF source identification based on Pb and Zn isotopic fingerprints, (2) source apportionment in the MIF model for total PM mass, and (3) new insights into potential Zn isotopic signatures of biomass burning and secondary aerosol. We support future studies on the improvement of isotopic fingerprints database of sources based on erse elements or compounds to boost advances of MIF model applications in atmospheric sciences.
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 12-2016
Publisher: Copernicus GmbH
Date: 24-11-2016
DOI: 10.5194/ACP-16-14635-2016
Abstract: Abstract. Atmospheric aerosol is the primary source of cloud condensation nuclei (CCN). The microphysics and chemical composition of aerosols can affect cloud development and the precipitation process. Among studies conducted in Latin America, only a handful have reported the impact of urban aerosol on CCN activation parameters such as activation ratio (AR) and activation diameter (Dact). With over 20 million inhabitants, the Metropolitan Area of São Paulo (MASP) is the largest megacity in South America. To our knowledge, this is the first study to assess the impact that remote sources and new particle formation (NPF) events have on CCN activation properties in a South American megacity. The measurements were conducted in the MASP between August and September 2014. We measured the CCN within the 0.2–1.0 % range of supersaturation, together with particle number concentration (PNC) and particle number distribution (PND), as well as trace-element concentrations and black carbon (BC). NPF events were identified on 35 % of the s ling days. Combining multivariate analysis in the form of positive matrix factorization (PMF) with an aerosol profile from lidar and HYSPLIT model analyses allowed us to identify the main contribution of vehicular traffic on all days and sea salt and biomass burning from remote regions on 28 and 21 % of the s ling days, respectively. The AR and Dact parameters showed distinct patterns for daytime with intense vehicular traffic and nighttime periods. For ex le, CCN activation was lower during the daytime than during the nighttime periods, a pattern that was found to be associated mainly with local road-traffic emissions. A decrease in CCN activation was observed on the NPF event days, mainly due to high concentrations of particles with smaller diameters. We also found that aerosols from sea salt, industrial emissions, and biomass burning had minor effects on Dact. For ex le, nights with biomass burning and vehicular emissions showed slightly lower CCN activation properties than sea-salt, industrial and non-event nights. Our results show that particulate matter from local vehicular emissions during the daytime has a greater effect on CCN activation parameters than that from remote sources.
Publisher: Elsevier BV
Date: 12-2003
Publisher: Elsevier BV
Date: 11-2010
Publisher: Elsevier BV
Date: 03-2018
Publisher: Elsevier BV
Date: 10-2010
Publisher: Elsevier BV
Date: 07-2017
DOI: 10.1016/J.ENVPOL.2017.04.011
Abstract: The application of zinc (Zn) isotopes in bivalve tissues to identify zinc sources in estuaries was critically assessed. We determined the zinc isotope composition of mollusks (Crassostrea brasiliana and Perna perna) and suspended particulate matter (SPM) in a tropical estuary (Sepetiba Bay, Brazil) historically impacted by metallurgical activities. The zinc isotope systematics of the SPM was in line with mixing of zinc derived from fluvial material and from metallurgical activities. In contrast, source mixing alone cannot account for the isotope ratios observed in the bivalves, which are significantly lighter in the contaminated metallurgical zone (δ
Publisher: FapUNIFESP (SciELO)
Date: 06-2016
DOI: 10.1590/2317-4889201620150010
Abstract: ABSTRACT: The first results of Pb isotope compositions of the high-Ti Mesozoic dykes of the Southern Espinhaço are presented. The results do not show large variations and are significantly more radiogenic than the Pb isotope compositions of the high-Ti tholeiites from the Paraná Continental Flood Basalts. The data combined with published geochemical and Sr-Nd isotope results rule out crustal contamination processes in the genesis of the dykes, requiring magma generation in metasomatized subcontinental lithospheric mantle with the involvement of HIMU-type and carbonatite components. The magmas may have been also derived from a mantle source containing ~4 - 5% of pyroxenite and ~1% of carbonatite melts, agreeing with published Os isotope compositions of high-Ti rocks from the Paraná Continental Flood Basalts. These metasomatizing agents could be responsible for mantle source refertilization, as was also proposed in the literature to explain the characteristics of xenoliths of the Goiás Alkaline Province, which also occurs in the border of the São Francisco Craton. Additionally, to evaluate the risks of Pb contamination during s le preparation for analysis, several experimental tests were accomplished, which indicate the need of sawed surface removal and a careful washing of small-sized rock fragments before powdering, especially for rocks with [Pb] 7 µg/g.
Publisher: Elsevier BV
Date: 11-2009
Publisher: Elsevier BV
Date: 12-2020
Publisher: Sociedade Brasileira de Geologia
Date: 12-2005
Publisher: American Geophysical Union (AGU)
Date: 06-1996
DOI: 10.1029/95TC03247
Publisher: Universidade de Sao Paulo, Agencia USP de Gestao da Informacao Academica (AGUIA)
Date: 08-2011
Publisher: Informa UK Limited
Date: 02-2008
Publisher: FapUNIFESP (SciELO)
Date: 21-08-2017
DOI: 10.1590/2317-4889201720160126
Abstract: ABSTRACT: High-resolution chemostratigraphic data of carbonates from the Sete Lagoas Formation (Bambuí Group) show large variations on the C, O, and Sr isotope compositions. Impure limestones at the base show primal δ13C values between -1.0 and 0‰, and δ18O values between -12.0 and -8.0‰. However, some dolostones demonstrate δ13C values varying from +2.8 to -6.8‰, highly radiogenic 87Sr/86Sr ratios ( .7111), and low Sr concentrations ( ppm) related to post-depositional processes. In contrast, pure limestones at the top show very positive δ13C values between +8.3 and +12.8‰, δ18O values between -10.0 to -6.0‰, and 87Sr/86Sr ratios from 0.7073 to 0.7086, with high Sr concentrations ( ppm). They are linked to depositional controls on the carbonate platform, such as fluvial and/or submarine water influx, in which carbonates deposited on the proximal sector exhibit significant Sr isotopic variations and those on the distal sector were not subject to such controls, resulting in very homogeneous Sr isotope profiles. However, 87Sr/86Sr ratios of the distal carbonates are less radiogenic than carbonates expected for late Ediacaran (~0.7085). This discrepancy suggests a restricted marine basin without Sr isotopic homogenization with contemporary oceans and, in this case, global correlations based on Sr isotope stratigraphy are not reliable.
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 07-2012
Publisher: Springer International Publishing
Date: 2014
Publisher: Sociedade Brasileira de Quimica (SBQ)
Date: 2016
Publisher: Geological Society of America
Date: 30-08-2021
DOI: 10.1130/G49134.1
Abstract: Global Neoproterozoic glaciations are related to extreme environmental changes and the reprise of iron formation in the rock record. However, the lack of narrow age constraints on Cryogenian successions bearing iron-formation deposits prevents correlation and understanding of these deposits on a global scale. Our new multiproxy data reveal a long Cryogenian record for the Jacadigo Group (Urucum District, Brazil) spanning the Sturtian and Marinoan ice ages. Deposition of the basal sequence of the Urucum Formation was influenced by Sturtian continental glaciation and was followed by a transgressive interglacial record of & m of carbonates that terminates in a glacioeustatic unconformity. Overlying this, there are up to 500 m of shale and sandstone interpreted as coeval to global Marinoan glacial advance. Glacial outwash delta deposits at the top of the formation correlate with diamictite-filled paleovalleys and are covered by massive Fe and Mn deposits of the Santa Cruz Formation and local carbonate. This second transgression is related to Marinoan deglaciation. Detrital zircon provenance supports glaciostatic control on Cryogenian sedimentary yield at the margins of the Amazon craton. These findings reveal the sedimentary response to two marked events of glacioeustatic incision and transgression, culminating in massive banded iron deposition during the Marinoan cryochron.
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier BV
Date: 07-2015
Publisher: FapUNIFESP (SciELO)
Date: 06-2016
Publisher: Elsevier BV
Date: 06-2021
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 02-2007
Publisher: Wiley
Date: 12-2007
Publisher: Cambridge University Press (CUP)
Date: 2012
DOI: 10.1016/J.YQRES.2011.09.007
Abstract: The paleoclimatic record of Juréia Paleolagoon, coastal southeastern Brazil, includes cyclic and gradual changes with different intensities and frequencies through geological time, and it is controlled by astronomical, geophysical, and geological phenomena. These variations are not due to one single cause, but they result from the interaction of several factors, which act at different temporal and spatial scales. Here, we describe paleoenvironmental evidence regarding climatic and sea level changes from the last 9400 cal yr BP at the Juréia Paleolagoon – one of the main groups of protected South Atlantic ecosystems. Geochemical evidences were used to identify anomalies from multi-proxy analyses of a paleolagoon sediment core. The anomalies of centennial scale were correlated to climate and transgression–regression cycles from the Holocene period. Decadal scale anomalous oscillations in the Quaternary paleolagoon sediments occur between 9400 and 7500 cal yr BP, correlated with long- and short-term natural events, which generated high sedimentation rates, mainly between 8385 and 8375 cal yr BP (10 cm/yr). Our results suggest that a modern-day short-duration North Atlantic climatic event, such as the 8.2 ka event, could affect the environmental equilibrium in South America and intensify the South American Summer Monsoon.
Start Date: 2005
End Date: 2008
Funder: São Paulo Research Foundation
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End Date: 2001
Funder: São Paulo Research Foundation
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End Date: 1998
Funder: São Paulo Research Foundation
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End Date: 2007
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2017
End Date: 2020
Funder: National Council for Scientific and Technological Development
View Funded ActivityStart Date: 1994
End Date: 1997
Funder: São Paulo Research Foundation
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End Date: 2003
Funder: São Paulo Research Foundation
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End Date: 2014
Funder: São Paulo Research Foundation
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Funder: São Paulo Research Foundation
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End Date: 2011
Funder: São Paulo Research Foundation
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End Date: 2013
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2011
End Date: 2015
Funder: São Paulo Research Foundation
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End Date: 2007
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2006
End Date: 2007
Funder: São Paulo Research Foundation
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End Date: 2018
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2003
End Date: 2006
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2005
End Date: 2008
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2016
End Date: 2021
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2016
End Date: 2021
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2017
End Date: 2022
Funder: São Paulo Research Foundation
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End Date: 2018
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2008
End Date: 2008
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2010
End Date: 2010
Funder: São Paulo Research Foundation
View Funded ActivityStart Date: 2017
End Date: 2020
Funder: National Council for Scientific and Technological Development
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