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Geochemistry and Sr-Nd-Pb isotopic constraints on the petrogenesis of Cenozoic lavas from the Pali Aike and Morro Chico area (52°S), southern Patagonia, South America

Cited 4 time in scopus
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Title
Geochemistry and Sr-Nd-Pb isotopic constraints on the petrogenesis of Cenozoic lavas from the Pali Aike and Morro Chico area (52°S), southern Patagonia, South America
Other Titles
남미 파타고니아 팔리아이케, 모로치고 신생대 화산암의 성인 및 지구화학
Authors
Lee, Jong Ik
Park, Kye-Hun
Kim, Kyu Han
Lee, Mi Jung
Choo, Mi Kyung
Subject
Geology
Keywords
Asthenosphere; HIMU-like ocean island basalt; Morro Chico; Pali Aike; Sr– Nd– Pb isotopes
Issue Date
2012
Publisher
Wiley
Citation
Lee, Jong Ik, et al. 2012. "Geochemistry and Sr-Nd-Pb isotopic constraints on the petrogenesis of Cenozoic lavas from the Pali Aike and Morro Chico area (52°S), southern Patagonia, South America". ISLAND ARC, 21(4): 327-350.
Abstract
Geochemical and isotopic analyses (Sr-Nd-Pb) of late Miocene to Quaternary plateau lavas from the Pali Aike and Morro Chico areas (52°S) were undertaken to constrain the melting processes and mantle sources that contributed to magma generation and the geodynamic evolution of southernmost Patagonia, South America. The Pali Aike and Morro Chico lavas are alkaline (Pali Aike, 45?49 wt.% SiO2;4.3?5.9 wt.% Na2O+K2O) and subalkaline (Morro Chico, 50.5?50.8 wt.% SiO2;4.0?4.4 wt.% Na2O+K2O), relatively primitive (Pali Aike, 9.5?13.7 wt.% MgO;Morro Chico, 7.6?8.8 wt.% MgO) mafic volcanic rocks that have typical intraplate ocean island basalt-like signatures. Incompatible trace element ratios and isotopic ratios of the Pali Aike and Morro Chico lavas differ from those of the majority of Neogene southern Patagonian slab window lavas in showing more enriched characteristics and are similar to HIMU-like basalts.On the basis of geochemical and isotope data and the available geological and geotectonic reconstructions, a link between the HIMU asthenospheric mantle domain beneath southernmost Patagonia and the HIMU mega-province of the southwestern Pacific Ocean is proposed.neration and the geodynamic evolution of southernmost Patagonia, South America. The Pali Aike and Morro Chico lavas are alkaline (Pali Aike, 45?49 wt.% SiO2;4.3?5.9 wt.% Na2O+K2O) and subalkaline (Morro Chico, 50.5?50.8 wt.% SiO2;4.0?4.4 wt.% Na2O+K2O), relatively primitive (Pali Aike, 9.5?13.7 wt.% MgO;Morro Chico, 7.6?8.8 wt.% MgO) mafic volcanic rocks that have typical intraplate ocean island basalt-like signatures. Incompatible trace element ratios and isotopic ratios of the Pali Aike and Morro Chico lavas differ from those of the majority of Neogene southern Patagonian slab window lavas in showing more enriched characteristics and are similar to HIMU-like basalts.On the basis of geochemical an
URI
http://repository.kopri.re.kr/handle/201206/6405
DOI
http://dx.doi.org/10.1111/iar.12002
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