尼帕-博图奥巴反斜长岩基底片麻岩和花岗岩:通古斯超岩系和马干地层(南西伯利亚克拉通)边界带的阿新世和古新生代地壳关系的制约因素

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
O. M. Turkina, A. V. Plyusnin, T. V. Donskaya, I. V. Afonin, S. S. Sanin
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引用次数: 0

摘要

本文介绍了尼泊尔-博图奥巴反斜长岩西南部基底的三个深钻孔(Yalykskaya-4、Danilovskaya-532 和 Srednenepskaya-1)中片麻岩和花岗岩的地球化学和地球同步学数据。根据 U-Pb 锆石年代测定法,确定了花岗岩岩浆活动的三个阶段:2.8、2.0 和 1.87 Ga。在大约 2.8 Ga 的岩浆 TTG 原岩中形成了黑云母-闪长片麻岩(Yalykskaya-4 号钻孔),这些岩石代表了中新世地壳,并在新元古代末期(∼2.53 Ga)经历了西伯利亚克拉通通古斯超岩带的典型热效应。黑云母片麻岩(2.0 Ga ∼ 2.0 Ga)(Danilovskaya-532 号钻孔)在年龄上与马干地台和阿基坦造山带基底的花岗岩相关联,来自主要由古生代幼壳岩侵蚀形成的变质岩源。1.88 Ga A 型花岗岩(Srednenepskaya-1 号钻孔)与南西伯利亚岩浆带中碰撞后花岗岩岩浆活动的主要阶段相对应。约 2.8 Ga 的生物玢岩2.8Ga的生物玢岩-闪长岩片麻岩标志着通古斯超特异性岩带南部的奥陶纪地壳与古新生代幼生代地壳的东部边界,两者之间由具有中间同位素特征的花岗岩侵入的过渡带分隔。古新生代片麻岩和花岗岩的同位素组成表明,与通古斯超跨接触的马干南部边缘陆相包括阿切安和古新生代地壳区块,从而显示出与阿基坦造山带和增生造山带的相似性。通古斯超岩系与西伯利亚地台基底东部岩块的最终合并,相当于1.88 Ga的里程碑。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Gneisses and Granitoids of the Basement of the Nepa-Botuoba Anteclise: Constraints for Relation of the Archean and Paleoproterozoic Crust in the Boundary Zone between the Tungus Superterrane and Magan Terrane (South Siberian Craton)

Gneisses and Granitoids of the Basement of the Nepa-Botuoba Anteclise: Constraints for Relation of the Archean and Paleoproterozoic Crust in the Boundary Zone between the Tungus Superterrane and Magan Terrane (South Siberian Craton)

Gneisses and Granitoids of the Basement of the Nepa-Botuoba Anteclise: Constraints for Relation of the Archean and Paleoproterozoic Crust in the Boundary Zone between the Tungus Superterrane and Magan Terrane (South Siberian Craton)

The paper presents geochemical and geochronological data on gneisses and granitoids from three deep boreholes (Yalykskaya-4, Danilovskaya-532, Srednenepskaya-1) in the basement of the southwestern part of the Nepa-Botuoba anteclise. Based on U-Pb zircon dating, three stages of granitoid magmatism were identified: ∼2.8, 2.0 and 1.87 Ga. At ca. 2.8 Ga magmatic TTG protoliths of biotite–amphibole gneisses (Yalykskaya-4 borehole) were formed, these rocks represent the Mesoarchean crust and experienced thermal effects typical of the Tungus superterrane of the Siberian craton at the terminal Neoarchean (∼2.53 Ga). Biotite gneissic granites (∼2.0 Ga) (Danilovskaya-532 borehole), which correlate in age with the granitoids of the basement of the Magan terrane and the Akitkan orogenic belt, were derived from a metasedimentary source formed by the erosion of predominantly Paleoproterozoic juvenile crust rocks. The 1.88 Ga A-type granite (Srednenepskaya-1 borehole) corresponds to the main stage of post-collision granite magmatism within the South Siberian magmatic belt. The ca. 2.8 Ga biotite–amphibole gneisses mark the eastern boundary of the Archean crust with Paleoproterozoic juvenile crust in the south of the Tungus superterrane, which are separated by a transitional zone intruded by granites having intermediate isotopic characteristics. The isotopic composition of Paleoproterozoic gneisses and granitoids indicates that marginal southern Magan terrane in contact with the Tungus superterrane includes blocks of both Archean and Paleoproterozoic crust, thus showing similarity with the Akitkan orogenic belt and accretionary orogens. The final amalgamation of the Tungus superterrane with blocks of the eastern part of the Siberian platform basement corresponds to a milestone of 1.88 Ga.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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