塔里木克拉通西北部阿克苏地区埃迪卡拉地层中岩浆岩的出现及其地质影响

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Acta Geologica Sinica ‐ English Edition Pub Date : 2024-10-28 DOI:10.1111/1755-6724.15214
Hongzhe XIE, Xiangkun ZHU, Xun WANG, Yuan HE, Weibing SHEN
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引用次数: 0

摘要

塔里木克拉通是一个古老的前寒武纪大陆块,详细了解其热构造历史对于了解大陆演化的早期历史至关重要。塔里木克拉通西北部阿克苏地区埃迪卡拉纪苏盖特布拉克地层(Fm.)现在已经发现了明显的侵入特征,包括截断埃迪卡拉沉积层的岩浆岩、与上覆岩和底壁岩相互作用的侵入烘烤边缘,以及从内部到边缘的细粒过渡带。新发现表明,阿克苏埃迪卡拉地层中的这些岩浆岩并非喷发玄武岩,而是侵入辉长岩堤。因此,这些岩浆岩不能用来确定阿克苏地区苏盖特布拉克地层的形成时间,也不能作为区域地层关联的标志层。此外,根据岩浆岩是熔岩的假设推断出的该地区埃迪卡拉纪的热构造演化也需要修正。
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Occurrence of Mafic Rocks within Ediacaran Strata in the Aksu Region, NW Tarim Craton, and its Geological Implications

The Tarim Craton is an ancient Precambrian continental block, and detailed knowledge of its thermo-tectonic history is crucial for understanding the early history of continental evolution. Abundant layered mafic rocks, which have commonly been regarded as basalts, occur within the Ediacaran Sugetbrak Formation (Fm.) in the Aksu region of the northwestern Tarim Craton. Clear intrusive features have now been discovered, including mafic rocks truncating Ediacaran sedimentary layers, exhibiting an intrusion-baked margin where they interact with both the overlying and bottom wall rocks, and displaying a fine-grained transition zone from their interior to their margins. The new findings demonstrate that these mafic rocks within the Aksu Ediacaran strata were not erupted basalts but instead are intrusive diabase dykes. Therefore, these mafic rocks cannot be used to constrain the timing of the Sugetbrak Fm. in the Aksu area, nor as marker layers for regional stratigraphic correlation. Furthermore, the Ediacaran thermo-tectonic evolution in this region, deduced from the assumption that the mafic rocks are lavas, needs to be revised.

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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
期刊最新文献
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