特提斯—喜马拉雅赞斯卡尔—斯皮提寒武系昆赞拉组岩石地层的修正分类及其生物地层对比

IF 0.5 4区 地球科学 Q4 PALEONTOLOGY Journal of the Palaeontological Society of India Pub Date : 2023-09-21 DOI:10.1177/05529360231182287
Birendra P. Singh, O. N. Bhargava, Vishal Verma, Ravi S. Chaubey, S. K. Prasad
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引用次数: 0

摘要

在西北喜马拉雅地区,寒武系在赞斯卡尔和斯皮提地区保存完好,构成了特提斯喜马拉雅带的一部分。在目前的工作中,我们严格检查了在Zanskar(即Niri-Tsarap Chu和Kurgiakh山谷)和Spiti地区(即Chandra, Parahio, Pin和Sumna山谷剖面)暴露的寒武系Kunzam La组的地质,地层和生物地层方面。虽然昆扎姆拉组广泛发育,但从赞斯卡尔到斯皮提地区的任何一段都没有保存完整的序列。目前的工作表明,在每个研究剖面中都存在断层,从而消除了昆扎姆拉组的不同地层部分。因此,根据整体岩性特征、生物地层参数及局部保存状态,将该组重新划分为钱德拉、帕拉希奥和普尔尼3个正式段。本文还对Zanskar - Spiti地区的Kunzam La组进行了岩石地层对比和生物地层对比,验证了我们的岩石地层划分。
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Revised lithostratigraphic classification of the Cambrian Kunzam La Formation and its biostratigraphic correlations from Zanskar to Spiti, Tethyan Himalaya
In the northwest Himalayas, the Cambrian sequences forming part of the Tethyan Himalayan Zone are well preserved in the Zanskar and Spiti regions. In the present work, we critically examine the geologic, stratigraphic and biostratigraphic aspects of the Cambrian Kunzam La Formation exposed in the Zanskar (i.e., in the Niri-Tsarap Chu and Kurgiakh valleys) and Spiti regions (i.e., in Chandra, Parahio, Pin and Sumna valleys sections). Although the Kunzam La Formation is extensively developed, none of the sections from Zanskar to the Spiti regions preserves its complete succession. The present work reveals the presence of a fault in each studied section, which has eliminated different stratigraphic portions of the Kunzam La Formation. Therefore, based on overall lithologic characteristics, biostratigraphic parameters and local preservation state, this formation is re-classified into three formal members: the Chandra, Parahio and Purni. We also present lithostratigraphic and biostratigraphic correlations of the Kunzam La Formation from the Zanskar to Spiti regions, which validate our lithostratigraphic division.
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来源期刊
CiteScore
1.10
自引率
16.70%
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期刊介绍: The journal is devoted to the publication of original papers and review articles dealing with all aspects of Paleontology, Paleobotany, Stratigraphy, Geochronology, Anthropology and Pre-history.
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