ORCID Profile
0000-0002-6940-1035
Current Organisations
Peking University Shenzhen Graduate School
,
Trinity College Dublin
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Geology | Geochronology | Isotope Geochemistry | Tectonics
Publisher: Wiley
Date: 21-06-2013
Publisher: Geological Society of America
Date: 2007
DOI: 10.1130/G23768A.1
Publisher: Elsevier BV
Date: 09-2014
Publisher: Geological Society of London
Date: 2011
DOI: 10.1144/M36.44
Publisher: Elsevier BV
Date: 12-2020
Publisher: MDPI AG
Date: 03-06-2014
DOI: 10.3390/MIN4020503
Publisher: Wiley
Date: 23-01-2021
DOI: 10.1111/BRE.12527
Publisher: Wiley
Date: 21-06-2006
Publisher: Elsevier BV
Date: 02-2014
Publisher: Springer Science and Business Media LLC
Date: 04-2020
Publisher: Elsevier BV
Date: 05-2018
Publisher: Geological Society of London
Date: 07-02-2023
DOI: 10.1144/JGS2022-039
Abstract: The Limerick Igneous Suite (LIS) in County Limerick, SW Ireland, contains two distinct basaltic igneous units: the Knockroe and Knockseefin, which are expressed as hypabyssal intrusions, porphyritic dykes, diatremes, lava flows, agglomerates and tuffs. These units make up two distinct evolutionary trends: the Knockroe igneous units which range from alkaline basalts to trachyandesites, and the Knockseefin igneous units which range from alkaline basalts to basanites. U‒Pb dating of apatite establishes a primary crystallization age of c. 350 Ma for the Knockroe units. Strontium and Nd isotopes from the least-altered Knockroe bulk rock s les range over 0.70301–0.70454 and 0.512457–0.512493, respectively. The Sr isotopes for the least-altered Knockseefin s les are similar, ranging over 0.70325–0.70386, but the Nd values are slightly more radiogenic, spanning 0.512431–0.512437. Altered s les are buffered against changes in Nd, but some show excursions towards radiogenic Sr, suggesting contamination from Carboniferous seawater and/or introduction of Rb. Rb–Sr calculations conducted on altered Knockroe s les returned ages within uncertainty of the U‒Pb dates. The bulk rock isotope values, normalized trace element plots as well as Zr/Sm, Ce/Pb and Nb/U values demonstrate the LIS is comparable to ocean island basalts and Ce/Y and Zr/Nb values suggest the units likely originated from low degrees of partial melting likely caused by extension related to the amalgamation of Laurussia and Gondwana. Supplementary material: ESM 1, whole rock geochemistry data ESM 2, apatite chemistry and geochronology data and ESM 3, supplementary figures are available at 0.6084/m9.figshare.c.6297395
Publisher: Elsevier BV
Date: 11-2008
Publisher: American Chemical Society (ACS)
Date: 02-11-2021
Publisher: Elsevier BV
Date: 07-2017
Publisher: Geological Society of America
Date: 06-10-2010
DOI: 10.1130/B30139.1
Publisher: Cambridge University Press (CUP)
Date: 24-04-2019
DOI: 10.1017/S0016756819000220
Abstract: The Stac Fada Member of the Stoer Group, within the Torridonian succession of NW Scotland, is a melt-rich, impact-related deposit that has not been conclusively correlated with any known impact structure. However, a gravity low approximately 50 km east of the preserved Stac Fada Member outcrops has recently been proposed as the associated impact site. We investigate the location of the impact structure through a provenance study of detrital zircon and apatite in five s les from the Stoer Group. Our zircon U–Pb data are dominated by Archaean grains ( 2.5 Ga), consistent with earlier interpretations that the detritus was largely derived from local Lewisian Gneiss Complex, whereas the apatite data (the first for the Stoer Group) display a single major peak at c. 1.7 Ga, consistent with regional Laxfordian metamorphism. The almost complete absence of Archaean-aged apatite is best explained by later heating of the 2.5 Ga Lewisian basement (the likely source region) above the closure temperature of the apatite U–Pb system ( c. 375–450°C). The U–Pb age distributions for zircon and apatite show no significant variation with stratigraphic height. This may be interpreted as evidence that there was no major change in provenance during the course of deposition of the Stoer Group or, if there was any significant change, the different source regions were characterized by similar apatite and zircon U–Pb age populations. Consequently, the new data do not provide independent constraints on the location of the structure associated with the Stac Fada Member impact event.
Publisher: Elsevier BV
Date: 08-2015
Publisher: Geological Society of America
Date: 05-2007
DOI: 10.1130/B26080.1
Publisher: Elsevier BV
Date: 10-11-2008
Publisher: MDPI AG
Date: 05-10-2021
DOI: 10.3390/MIN11101095
Abstract: The temperature sensitivity of the U-Pb apatite system (350–570 °C) makes it a powerful tool to study thermal histories in the deeper crust. Recent studies have exploited diffusive Pb loss from apatite crystals to generate t-T paths between ~350–570 °C, by comparing apatite U-Pb ID-TIMS (isotope dilution-thermal ionisation mass spectrometry) dates with grain size or by LA-MC-ICP-MS (laser ablation-multicollector-inductively coupled plasma-mass spectrometry) age depth profiling/traverses of apatite crystals, and assuming the effective diffusion domain is the entire crystal. The key assumptions of apatite U-Pb thermochronology are discussed including (i) that Pb has been lost by Fickian diffusion, (ii) can experimental apatite Pb diffusion parameters be extrapolated down temperature to geological settings and (iii) are apatite grain boundaries open (i.e., is Pb lost to an infinite reservoir). Particular emphasis is placed on detecting fluid-mediated remobilisation of Pb, which invalidates assumption (i). The highly erse and rock-type specific nature of apatite trace-element chemistry is very useful in this regard—metasomatic and low-grade metamorphic apatite can be easily distinguished from sub-categories of igneous rocks and high-grade metamorphic apatite. This enables reprecipitated domains to be identified geochemically and linked with petrographic observations. Other challenges in apatite U-Pb thermochronology are also discussed. An appropriate choice of initial Pb composition is critical, while U zoning remains an issue for inverse modelling of single crystal ID-TIMS dates, and LA-ICP-MS age traverses need to be integrated with U zoning information. A recommended apatite U-Pb thermochronology protocol for LA-MC-ICP-MS age depth profiling/traverses of apatite crystals and linked to petrographic and trace element information is presented.
Publisher: Elsevier BV
Date: 10-2019
Publisher: Geological Society of America
Date: 21-07-2009
DOI: 10.1130/B26488.1
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 11-2020
Publisher: American Geophysical Union (AGU)
Date: 12-2018
DOI: 10.1029/2018GC007850
Publisher: Elsevier BV
Date: 2019
Publisher: American Geophysical Union (AGU)
Date: 11-11-2010
DOI: 10.1029/2009TC002654
Publisher: Mineralogical Society of America
Date: 06-2015
Publisher: Elsevier BV
Date: 04-2018
DOI: 10.1016/J.SCITOTENV.2017.11.112
Abstract: Zinc (Zn) is a micronutrient for organisms and essential for plant growth, therefore knowledge of its elemental cycling in the surface environment is important regarding wider aspects of human nutrition and health. To explore the nature of Zn cycling, we compared its weathering behaviour in a sub-recent regolith versus an ancient laterite profile of the Deccan Traps, India - an area of known soil Zn deficiency. We demonstrate that progressive breakdown of primary minerals and the associated formation of phyllosilicates and iron oxides leads to a depletion in Zn, ultimately resulting in a loss of 80% in lateritic residues. This residue is mainly composed of resistant iron oxides and hydroxides ultimately delivering insufficient amounts of bio-available Zn. Moreover, (sub)-tropical weathering in regions experiencing extended tectonic quiescence (e.g., cratons) further enhance the development of old and deep soil profiles that become deficient in Zn. This situation is clearly revealed by the spatial correlation of the global distribution of laterites, cratons (Africa, India, South America and Australia) and known regions of Zn deficient soils that result in health problems for humans whose diet is derived from such land. We also investigate whether this elemental depletion of Zn is accompanied by isotope fractionation. In the saprolitic horizons of both weathering profiles, compositions of δ
Start Date: 2020
End Date: 11-2024
Amount: $320,000.00
Funder: Australian Research Council
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