The Serra das Araras Batholith: An example of Ediacaran syntectonic peraluminous granitic magmatism in the southwestern Paraíba do Sul Domain

IF 1.5 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Journal of South American Earth Sciences Pub Date : 2017-10-01 DOI:10.1016/j.jsames.2017.05.013

Iuri Retamal , Rômulo Machado , Ruy Paulo Philipp , Cristiano Lana , Guilherme O. Gonçalves

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引用次数: 1

Abstract

The Serra das Araras Batholith (SAB), located at the southwest portion of the Paraíba do Sul Domain, Central Ribeira Belt, is composed of orthogneisses with peraluminous character. Combined LA-ICP-MS U-Pb and Lu-Hf isotopic analyses have been performed in zircon grains for a representative sample (SA-3H) of SAB. Data point to Rhyacian to Orosirian (ca. 2.1–1.8 Ga) inherited zircon cores with positive ɛHf_(t) values and Ediacaran U-Pb crystallization age (595 ± 8 Ma). A leucogranite dyke (SA-3D), 15–25 cm thick, which crosscuts SAB and a biotite-hornblende quartz diorite enclave (SA-06) have been analyzed. Crystallization ages for the three samples (ca. 600-590 Ma) and ɛHf_(t) values, ranging from −5.6 to −29.4 for Neoproterozoic zircon grains, indicate an Ediacaran crustal magmatism involving mid to lower crust anatexis and the reworking of Paleoproterozoic juvenile and crustal rocks.

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Serra das Araras岩基:西南Paraíba do Sul地区埃迪卡拉系同构造过铝质花岗质岩浆活动的一个例子

Serra das Araras Batholith (SAB)位于里贝拉带中部Paraíba do Sul域的西南部分，由具有过铝质特征的正交岩组成。结合LA-ICP-MS对SAB的代表性样品(SA-3H)进行了锆石U-Pb和Lu-Hf同位素分析。数据表明，中、奥陶系(约2.1 ~ 1.8 Ga)继承的锆石核具有正的Hf(t)值，埃迪卡拉系U-Pb结晶年龄(595±8 Ma)。分析了一条15 ~ 25 cm厚的浅花岗岩脉(SA-3D)和一条黑云母-角闪石石英闪长岩包体(SA-06)。3个样品的结晶年龄(约600 ~ 590 Ma)和α Hf(t)值(新元古代锆石颗粒)在−5.6 ~−29.4之间，表明埃迪卡拉期地壳岩浆作用，包括中-下地壳深熔和古元古代幼岩和地壳岩石的改造。

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.