GEOCHEMISTRY AND U-Pb GEOCHRONOLOGY OF THE NEOARCHEAN GNEISSES AND PALEOPROTEROZOIC GRANITES FROM JANUÁRIA HIGH: RECORDS OF JUVENILE AND YOUTHFUL EARTH IN THE SÃO FRANCISCO CRATON NUCLEUS (BRAZIL)

Q4 Earth and Planetary Sciences
Alexandre de Oliveira CHAVES, Christopher Rocha de REZENDE, Marco Antônio Leandro da SILVA, Ana Clara da Cruz PIRES
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Abstract

Within the proposal of secular evolution of the Earth system divided into seven phases: “Proto-Earth” (4.57–4.45 Ga); “Primordial Earth” (4.45–3.80 Ga); “Primitive Earth” (3.8–3.2 Ga); “Juvenile Earth” (3.2–2.5 Ga); “Youthful Earth” (2.5–1.8 Ga); “Middle Earth” (1.8–0.8 Ga); and “Contemporary Earth” (since 0.8 Ga), the 2.61-2.64 Ga High-K, meta- to peraluminous Januária High orthogneisses are inserted in the context of almost rigid behavior of the lithosphere, by the end of the Juvenile Earth. With protolith origin suggestive of intracrustal partial melting of local older TTG (tonalite-trondhjemite-granodiorite), these orthogneisses are the representatives in the São Francisco craton nucleus of the 2.8 Ga to 2.6 Ga potassic rocks found in archean cratons worldwide, and the occurrence of these rocks is a defining characteristic of the Juvenile Earth. Supported on evidence of the plate tectonic activity in Paleoproterozoic, the 2.14-2.19 Ga Januária High biotite granites are inserted in the context of Youthful Earth and they are the record of accretionary orogeny delineated by the edification of magmatic arc at that time. They are calc-alkaline, I-type rocks typical of subduction-related continental magmatic arcs. These biotite granites are probably derived from a High-K mafic source associated with tonalites.
JANUÁRIA高地新太古代片麻岩和古元古代花岗岩的地球化学和U-Pb年代学:巴西SÃO FRANCISCO克拉通核的幼年和幼年地球记录
地球系统的长期演化分为七个阶段:“原地球”(4.57-4.45 Ga);“原始地球”(4.45-3.80 Ga);“原始地球”(3.8-3.2 Ga);“少年地球”(3.2-2.5 Ga);“青年地球”(2.5-1.8 Ga);“中土世界”(1.8-0.8 Ga);和“当代地球”(自0.8 Ga以来),2.61-2.64 Ga高钾,元至过铝Januária高正性是在岩石圈几乎刚性行为的背景下插入的,在幼年地球结束时。这些正长石的原岩起源暗示了局部更古老的TTG(闪长岩-闪长岩-花岗闪长岩)在壳内部分熔融,是世界范围内太古宙克拉通中发现的2.8 Ga ~ 2.6 Ga钾质岩石的 o Francisco克拉通核的代表,它们的出现是地球幼期的一个决定性特征。在古元古代板块构造活动证据的支持下,2.14-2.19 Ga Januária高黑云母花岗岩是在年轻地球背景下插入的,是当时岩浆弧的陶冶所描绘的增生造山作用的记录。它们是钙碱性的i型岩石,是与俯冲有关的大陆岩浆弧的典型特征。这些黑云母花岗岩可能来源于与调性岩有关的高钾基性花岗岩。
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来源期刊
Geociencias
Geociencias Earth and Planetary Sciences-Earth and Planetary Sciences (all)
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0.70
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