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Neoarchean-Palaeoproterozoic sedimentary basins in the Sarmatian Craton: Global correlations and connections
Geological Journal ( IF 1.8 ) Pub Date : 2021-06-06 , DOI: 10.1002/gj.4185
Konstantin A. Savko 1, 2 , Aleksandr V. Samsonov 3 , M. Santosh 4, 5 , Marina Yu. Ovchinnikova 1
Affiliation  

The East European Craton is a collage of Early Precambrian crustal fragments including Fennoscandia, Sarmatia, and Volga-Uralia, which are welded by Palaeoproterozoic collisional orogens. Here, we present a detailed overview of the sedimentary basins in Sarmatia that incorporate giant belts of banded iron formations (BIFs) and are therefore important in understanding the geological history and global correlations during the Archean-Proterozoic transition. Among the two sedimentary basins in Sarmatia (Mikhailovsky and Tim-Kryvyi Rih), the Mikhailovsky Basin is characterized by the presence of a carbonate platform underlying BIFs. The BIFs are locally overlain by thin clastic deposits. Thick-bedded dolomites occur with BIF in the Tim Kryvyi Rih Basin. In the Mikhailovsky Basin, after their deposition there was a long-lasting hiatus. In the Mikhailovsky Basin, there are no sedimentary rocks after the regional hiatus except for glacial deposits. Sedimentation resumed with the development of continental rift-related structures, where the accumulation of terrigenous sediments was accompanied by, and culminated with, outflows of basalts at 2.1 Ga. A detailed evaluation of the history of sedimentary basins in Sarmatia record transgression (~2.6–2.4 Ga) with the accumulation of giant BIFs (~2.50–2.45 Ga), regression (~2.4–2.2 Ga), hiatus and glaciations (~2.4–2.2 Ga), and rift-related volcanism (~2.2–2.1 Ga). We attempt a correlation of the sedimentary sequences in Sarmatia with those of Pilbara, Kaapvaal, and São Francisco cratons which show that the geological events on all these cratons were similar during 2.6–2.4 Ga. We thus propose that the Sarmatia Craton may serve as a link in the palaeocontinental correlations of the Vaalbara Supercraton and the São Francisco Craton, based on the striking similarity in the Neoarchean-Early Palaeoproterozoic sedimentary basins.

中文翻译:

萨尔马提亚克拉通新太古代-古元古代沉积盆地:全球相关性和联系

东欧克拉通是由古元古代碰撞造山带焊接的包括芬诺斯坎迪亚、萨尔马提亚和伏尔加-乌拉利亚在内的早前寒武纪地壳碎片的拼贴画。在这里,我们详细概述了 Sarmatia 的沉积盆地,这些盆地包含巨大的带状铁层 (BIF) 带,因此对于了解太古代 - 元古代过渡期间的地质历史和全球相关性非常重要。在 Sarmatia 的两个沉积盆地(Mikhailovsky 和 ​​Tim-Kryvyi Rih)中,Mikhailovsky 盆地的特点是在 BIF 下存在碳酸盐台地。BIF 局部被薄的碎屑沉积物覆盖。厚层白云岩与 BIF 一起出现在 Tim Kryvyi Rih 盆地。在米哈伊洛夫斯基盆地,沉积后出现了长期中断。在米哈伊洛夫斯基盆地,区域间断后除冰川沉积外没有其他沉积岩。随着大陆裂谷相关构造的发展,沉积作用恢复,其中陆源沉积物的积累伴随着 2.1 Ga 玄武岩的流出并达到顶峰。对 Sarmatia 沉积盆地历史的详细评估记录了海侵(~2.6- 2.4 Ga)伴随着巨大 BIF 的积累(~2.50-2.45 Ga)、回归(~2.4-2.2 Ga)、间断和冰川作用(~2.4-2.2 Ga)以及与裂谷相关的火山活动(~2.2-2.1 Ga)。我们尝试将 Sarmatia 的沉积层序与 Pilbara、Kaapvaal 和 São Francisco 克拉通的沉积层序进行对比,这表明所有这些克拉通的地质事件在 2.6-2.4 Ga 期间是相似的。
更新日期:2021-06-06
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