西巴伊亚造山带（巴西奥弗朗西斯科克拉通）的Rhyacian （2218-2066 Ma）俯冲相关火山-沉积增生及其构造意义

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-09-26 DOI:10.1016/j.precamres.2025.107925

Michel Macedo Meira , Simone Cerqueira Pereira Cruz , Elson Paiva Oliveira , Joseneusa Brilhante Rodrigues , Angela Beatriz de Menezes Leal , Cristiano Lana

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引用次数: 0

摘要

来自西北弗朗西斯科克拉通的新证据揭示了米纳斯-巴伊亚造山带的古元古代构造演化。boqueir o de Baixo组和Chapada Grande组两个变质火山-沉积层序记录了一个流纹造山系的阶段，通过综合地层、岩石学、地球化学、年代学和同位素数据进行了表征。boqueir o de Baixo组变质火山岩主要为细粒拉斑闪长岩，锆石ƐHf(t)值为+3.78 ~ + 5.6，在2218±18 Ma结晶，在2020±7 Ma变质。查帕达大组由变质沉积岩和钙碱性-超经典基性-中变质火山岩组成，结晶年龄在2096±20 Ma ~ 2066±6 Ma之间，演化的同位素特征为ƐHf(t)−18.5 ~−8.84。这些地层发育于Bom Jesus da Lapa地体东部边缘的大陆弧环境中，其变质沉积岩记录了弧前、弧内和被动边缘沉积。碰撞后的左旋走滑剪切带形成了拉分盆地，有利于沉积和瓜南壁正长岩套的侵位。该研究细化了米纳斯-巴伊亚造山系的构造演化，为研究流-奥造山带和哥伦比亚超大陆的早期组装提供了新的认识。

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Rhyacian (2218–2066 Ma) subduction-related volcanosedimentary accretion in the Western Bahia Orogenic Domain (São Francisco Craton, Brazil), and tectonic implications

New evidence from the northwestern São Francisco Craton sheds light on Paleoproterozoic tectonic evolution in the Minas-Bahia Orogen. Two metavolcanosedimentary sequences—the Boqueirão de Baixo and Chapada Grande formations—record stages of a Rhyacian orogenic system, characterized through integrated stratigraphic, petrographic, geochemical, geochronological, and isotopic data. The metavolcanic rocks of the Boqueirão de Baixo Formation consist mainly of fine-grained tholeiitic amphibolites, with juvenile zircon Ɛ_Hf(t) values (+3.78 to + 5.6), which crystallized at 2218 ± 18 Ma and were metamorphosed at 2020 ± 7 Ma. The Chapada Grande Formation comprises metasedimentary rocks and calc-alkaline to ultrapotassic mafic to intermediate metavolcanics, with crystallization ages between 2096 ± 20 Ma and 2066 ± 6 Ma and evolved isotopic signatures (Ɛ_Hf(t) −18.5 to −8.84). These formations developed in a continental arc setting along the eastern margin of the Bom Jesus da Lapa Terrane, with the metasedimentary rocks recording forearc, intra-arc, and passive margin deposition. Post-collisional sinistral strike-slip shear zones subsequently generated a pull-apart basin, which favored sediment deposition and the emplacement of the Guanambi Syenite Suite. This study refines the tectonic evolution of the Minas–Bahia Orogenic System and provides new insights into Rhyacian–Orosirian orogenic belts and the early assembly of the Columbia Supercontinent.

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来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.