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First documentation of Middle Ordovician warm-water carbonates in the Mount Jolmo Lungma (Mount Everest) area, southern Xizang (Tibet), China, and its paleogeographic implications
Yu, Shenyang (于深洋)1,2,3; Fang, Xiang (方翔)2; Munnecke, Axel4; Li, Wenjie1,2,5; Zhen, Yongyi6; Li, Yue (李越)1,2; Wang, Zhihao (王志浩)2; Zhang, Yuandong (张元动)1,2,5
2019-09-15
发表期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
卷号530页码:136-151
摘要

A Middle Ordovician limestone succession, representing part of the Alai Formation (middle part of the Chiatsun Group) of the Himalayan Orogenic Belt, is well exposed at Jiacun section in Nyalam County to the west of the Mount Jolmo Lungma (Mount Everest), southern Xizang (Tibet), China. The succession, though reported previously, has yet to be investigated in detail, especially in the aspects of precise dating, stratigraphic correlation and its paleogeographical affinities. In this contribution we document for the first time the conodont biostratigraphy, carbon isotope chemostratigraphy and microfacies analyses of this carbonate succession. The conodont fauna indicates a middle Darriwilian (Middle Ordovician) age corresponding to the Histiodella holodentata Biochronozone. The carbon isotope records have shown minor fluctuations of delta C-13 values, with only a small negative carbon excursion in the lower part. The microfacies analysis has resulted in the identification of seven microfacies, including micritic limestone, lithoclastic packstone, non-skeletal grainstone, bioclastic limestone, bioclastic-lithoclastic limestone, bioclastic-lithoclastic-oncoid limestone, and bioclastic-lithoclastic-oncoid-ooid limestone. From thin sections, fragments of crinoids, brachiopods, gastropods, trilobites, bryozoans and calcareous algae are identified. Abundant lithoclasts, cortoids, peloids, oncoids and ooids, together with the occurrences of dasyclad algae and hardgrounds, are also recognized, indicating a shallow- and warm-water marine environment, and a likely tropical or subtropical affinity. Comparison of the lithofacies and faunas of this limestone succession of the Alai Formation with coeval strata in the Zanskar-Spiti area (northern India), Nepal, Bhutan, Canning Basin (West Australia), Lhasa, Qiangtang, Sibumasu, Tarim and North China, suggests that during the Darriwilian these regions or terranes may have possessed a warm-water marine environment and were located in low-latitudinal zones. It seems likely that this region of the northeastern Gondwana and peri-Gondwana was protected from substantial influx of cool-water currents derived from high latitudes at that time.

关键词Carbonate microfacies Chemostratigraphy Conodont biostratigraphy Darriwilian Himalaya Paleogeography
DOI10.1016/j.palaeo.2019.05.030
语种英语
关键词[WOS]TARIM BASIN ; ISOTOPE STRATIGRAPHY ; NORTHWEST CHINA ; EXCURSION MDICE ; REEF COMPLEX ; EVOLUTION ; CHEMOSTRATIGRAPHY ; SUCCESSION ; GONDWANA ; HISTORY
资助项目Chinese Academy of Sciences[XDB26000000] ; Chinese Academy of Sciences[XDB10010503] ; Chinese Academy of Sciences[XDB10010102] ; Chinese Academy of Sciences[XDB10010104] ; SAFEA program of CAS ; National Natural Science Foundation of China[41772005] ; National Natural Science Foundation of China[41290260]
WOS研究方向Physical Geography ; Geology ; Paleontology
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号WOS:000478712100010
项目资助者Chinese Academy of Sciences ; SAFEA program of CAS ; National Natural Science Foundation of China
出版者ELSEVIER
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/27970
专题中国科学院南京地质古生物研究所
通讯作者Zhang, Yuandong (张元动)
作者单位1.Chinese Acad Sci, CAS Key Lab Econ Stratig & Palaeogeog, Nanjing Inst Geol & Palaeontol, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
4.Fachgrp Palaoumwelt, GeoZentrum Nordbayern, Loewenichstr 28, D-91054 Erlangen, Germany
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Geol Survey New South Wales, WB Clarke Geosci Ctr, Londonderry, NSW 2753, Australia
第一作者单位中国科学院南京地质古生物研究所
通讯作者单位中国科学院南京地质古生物研究所
推荐引用方式
GB/T 7714
Yu, Shenyang ,Fang, Xiang ,Munnecke, Axel,et al. First documentation of Middle Ordovician warm-water carbonates in the Mount Jolmo Lungma (Mount Everest) area, southern Xizang (Tibet), China, and its paleogeographic implications[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2019,530:136-151.
APA Yu, Shenyang .,Fang, Xiang .,Munnecke, Axel.,Li, Wenjie.,Zhen, Yongyi.,...&Zhang, Yuandong .(2019).First documentation of Middle Ordovician warm-water carbonates in the Mount Jolmo Lungma (Mount Everest) area, southern Xizang (Tibet), China, and its paleogeographic implications.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,530,136-151.
MLA Yu, Shenyang ,et al."First documentation of Middle Ordovician warm-water carbonates in the Mount Jolmo Lungma (Mount Everest) area, southern Xizang (Tibet), China, and its paleogeographic implications".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 530(2019):136-151.
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