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Petrogenesis of Granites from the Ediacaran Socorro Batholith,SE Brazil:Constraints from Zircon Dating,Geochemistry and Sr-Nd-Hf Isotopes

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Journal of Earth Science 2021年第6期32卷 1397-1414页

作者： Bárbara Bueno Toledo valdecir de assis janasi Instituto de Geociências USPCEP 05508-900S∼ao PauloSPBrazil

Whole rock elemental and Sr-Nd isotope geochemistry and in situ zircon Hf isotope geochemistry were used to identify the sources of the Neoproterozoic granites from the Socorro batholith,Socorro-GuaxupéNappe(SGN),South Brasilia Orogen,*** trace elements and Hf isotope geochemistry provided information about sources and crystallization(T,f_(O2))*** main types of granites built the bulk of the batholiths,beginning with probably pre-collisional~640–630 Ma charnockites,and ending with~610 Ma voluminous post-collisional high-K calc-alkaline(HKCA)Ⅰ-type granites(Bragan?a Paulista-type).Several types of leucogranites were generated from 625 to 610 Ma,spanning the interval from collisional to post-collisional *** charnockite bodies occur in the study area:the~640 Ma Socorro charnockite has remarkable chemical similarities with Braganca Paulista-type granites,but higherε_(Nd)(t)=-6.1 and average zirconε_(Hf)(t)=-9.1 and lower^(86)Sr/^(87)Sr_(t)(0.7093)values,indicative of more juvenile and water-poor ***~633 Ma Atibaia charnockite has distinct geochemical signature(lower Mg^(#)and Sr content;higher Zr),more negativeε_(Nd)(t)=-14.1,similar average zirconε_(Hf)(t)=-8.9,and much higher^(86)Sr/^(87)Sr_(t)=0.7197,probably reflecting a larger component from old *** predominant~610 Ma Bragan?a Paulista-type granites were emplaced in a post-collisional setting,and correspond to porphyritic biotite-hornblende monzogranites of high-K calc-alkaline character with 61 wt.%–67 wt.%SiO_(2),high Mg^(#)(39–42),Sr/Y(19–40),La/Yb(12–69),highly negativeε_(Nd)(t)(-12.3 to-12.9)and zirconε_(Hf)(t)(-12 to-17)and^(87)Sr/^(86)Sr_(t)=0.7119–*** features are interpreted as indicative of magma generation in a thickened crust,where melts from enriched mantle sources emplaced in the lowermost crust,heated host old continental crust rocks(gneisses and granulites)and partially mixed with their melting *** plutons(SiO_(2)>72 wt.%)occur

关键词： U-Pb dating Socorro-GuaxupéNappe high-K calc-alkaline granites

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Preface

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Journal of Earth Science 2021年第6期32卷 1287-1288页

作者： Maria de Fátima Bitencourt valdecir de assis janasi Programa de Pós-Graduação em Geociências(PPGGEO) Universidade Federal do Rio Grande do Sul(UFRGS)Porto AlegreBrazil Instituto de Geociências USPCEP 05508-900 São Paulo-SPBrazil

Post-collisional settings have long been discussed, both in the aspect of nomenclature, tectonic significance, sources of magmatism, and their relations to pre-collisional and intraplate settings. To many authors, it should be synonymous with lateorogenic or late-collisional settings because the setting itself is defined as the period following the main impact of the colliding landmasses. On the other hand, terms like post-tectonic should be avoided when referring to post-collisional associations.

关键词： setting tectonic collisional

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