ORCID Profile
0000-0003-4525-9967
Current Organisations
Universidade Federal do ABC
,
University of Melbourne
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Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 02-2020
Publisher: American Association for the Advancement of Science (AAAS)
Date: 04-03-2022
Abstract: Earth's carbon cycle is strongly influenced by subduction of sedimentary material into the mantle. The composition of the sedimentary subduction flux has changed considerably over Earth's history, but the impact of these changes on the mantle carbon cycle is unclear. Here, we show that the carbon isotopes of kimberlite magmas record a fundamental change in their deep-mantle source compositions during the Phanerozoic Eon. The
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TC00022B
Publisher: American Geophysical Union (AGU)
Date: 08-2022
DOI: 10.1029/2021GC010324
Abstract: Despite the scientific and economic significance of kimberlites and related magmas, their origin is unclear. Here, we address this issue using whole‐rock and perovskite‐derived Sr‐Nd‐Hf isotopes for the three occurrences of kimberlite, l roites and ultramafic l rophyres (UMLs) in Finland. Mesoproterozoic olivine l roites at Lentiira‐Kuhmo and UMLs at Kuusamo have different isotopic signatures yet were emplaced contemporaneously at 1,200 Ma in response to an extensional regime linked to the Baltica‐Laurentia breakup. The low εNd (i) and εHf (i) values of the olivine l roites are consistent with an enriched subcontinental lithospheric mantle (SCLM) source while UML compositions are intermediate between those of typical kimberlites and l roites and are interpreted to reflect mixing of asthenospheric melts and ∼10%–15% of melts sourced from metasomatized SCLM. The ∼750 Ma Kuusamo kimberlites, are probably linked to the mantle plume activity that initiated Rodinia's break‐up, exhibiting homogenous isotopic compositions which mirror the prominent Geodynamic and Source Constraints for ∼1,200 Ma Olivine L roite and Ultramafic L rophyre Magmatism in Eastern Finland (PREMA)‐like signature of kimberlites globally. By contrast, ∼620–585 Ma Kaavi‐Kuopio kimberlites show limited range in εNd (i) and 87 Sr/ 86 Sr (i) but have remarkably heterogeneous εHf (i) (+6.5 to −6.3) with a temporal trend toward lower εHf (i) values. While the Kuusamo kimberlites erupted during the early stage of continental break‐up, the Kaavi‐Kuopio kimberlites were emplaced when Rodinia break‐up was completed, coeval with formation of the Central Iapetus large igneous province. Magmas forming the Kaavi‐Kupio kimberlites may have formed from an upwelling mantle source similar to PREMA modified by increasing incorporation (up to 10%) of recycled crustal material through time accounting for the trend toward lower εHf (i) in these kimberlites.
Publisher: The Open Journal
Date: 09-06-2020
DOI: 10.21105/JOSS.02314
Location: Brazil
Location: Canada
Location: Canada
No related grants have been discovered for Hugo Gajardoni de Lemos.