气候变化领域集成服务门户(CCPortal): First documentation of Middle Ordovician warm-water carbonates in the Mount Jolmo Lungma (Mount Everest) area; southern Xizang (Tibet); China; and its paleogeographic implications

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DOI	10.1016/j.palaeo.2019.05.030
	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 S.; Fang X.; Munnecke A.; Li W.; Zhen Y.; Li Y.; Wang Z.; Zhang Y.
发表日期	2019
ISSN	0031-0182
起始页码	136
结束页码	151
卷号	530
英文摘要	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 δ13C 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. © 2019 Elsevier B.V.
英文关键词	Carbonate microfacies; Chemostratigraphy; Conodont biostratigraphy; Darriwilian; Himalaya; Paleogeography
语种	英语
scopus关键词	biostratigraphy; carbonate system; chemostratigraphy; conodont; documentary source; Gondwana; marine environment; microfacies; new record; Ordovician; paleogeography; stratigraphic correlation; warm water; Australia; Bhutan; Canning Basin; China; Himalayas; Khumbu Himal; Lhasa; Mount Everest; Nepal; Nyalam; Western Australia; Xizang; Xizang; Zanskar Himalayas; algae; Brachiopoda; Bryozoa; Gastropoda; Pelmatozoa; Trilobitomorpha
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150900
作者单位	CAS Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, 210008, China; Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China; University of Science and Technology of China, Hefei, 230026, China; GeoZentrum Nordbayern, Fachgruppe Paläoumwelt, Loewenichstr. 28, Erlangen, D-91054, Germany; University of Chinese Academy of Sciences, Beijing, 100049, China; Geological Survey of New South Wales, W.B. Clarke Geoscience Centre, Londonderry, NSW 2753, Australia
推荐引用方式 GB/T 7714	Yu S.,Fang X.,Munnecke A.,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],2019,530.
APA	Yu S..,Fang X..,Munnecke A..,Li W..,Zhen Y..,...&Zhang Y..(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.
MLA	Yu S.,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).