Stratigraphic correlation of Cambrian-Ordovician deposits along the Himalaya: Implications for the age and nature of rocks in the Mount Everest region
Myrow, Paul M.1; Hughes, Nigel C.2; Searle, Michael P.3; Fanning, C. M.4; Peng, S-C (彭善池)5; Parcha, S. K.6
2009-03-01
发表期刊GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
卷号121期号:3-4页码:323-332
摘要

The depositional age and stratigraphic correlations of metamorphosed and variably deformed rocks of Mount Everest are poorly known because of limited recovery of diagnostic fossils. Detailed study of Cambrian and Ordovician strata from along the length of the Himalaya has produced a coherent stratigraphy that stretches from northern India to Tibet. Our work also demonstrates that the North Col Formation rocks (= Everest series), between the Qomolangma and Lhotse detachments of the South Tibetan detachment system, still locally preserve sedimentary textures and primary stratigraphy that match those within Cambrian strata similar to 1100 km to the west in northern India. This demonstrates a coherency of depositional systems and stratigraphic architecture for Cambrian deposits along much of the Himalaya Tethyan margin. It also allows, for the first time, identification of precise depositional ages of several units in the Everest region, in particular, the Yellow Band carbonate and directly underlying siliciclastic strata, which are both shown to be late Middle Cambrian in age. Detrital zircon data presented herein for a sample from these siliciclastic strata contain a similar age spectrum to those from Middle Cambrian strata in northern India, as well as grains as young as ca. 526 Ma, both of which support the depositional age and continuity of depositional systems along the length of the Himalaya. Highly fractured rocks of the Ordovician lower Chiatsun Group in the hanging wall of the South Tibetan detachment system in Nyalam, 75 km to the west of Everest, correlate with Ordovician strata of the Mount Qomolangma Formation on Mount Everest. Our correlations indicate that the base of the summit pyramid of Everest, the foot of the "Third Step," is composed of a 60-m-thick, white-weathering thrombolite bed. The top of this ancient microbial deposit crops out only 70 m below the summit of Mount Everest.

关键词India Himalaya Parahio Formation Cambrian Tethyan Everest
DOI10.1130/B26384.1
语种英语
关键词[WOS]Tibetan Detachment System ; U-th-pb ; Northwestern Himalaya ; Sedimentary History ; Indian Himalaya ; Passive Margin ; Metamorphism ; Deformation ; Zanskar ; Massif
资助项目National Science Foundation (NSF)[EAR-9980376] ; National Science Foundation (NSF)[EAR-0543340] ; Natural Environment Research Council (NERC ; UK)[EAR-9980426] ; Natural Environment Research Council (NERC ; UK)[EAR-053868] ; NITS[NER/K/S/2000/00951] ; CAS (China)[2006CB806408] ; CAS (China)[2006FY120300] ; CAS (China)[KZCX2-YW-122]
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000262964700001
项目资助者National Science Foundation (NSF) ; Natural Environment Research Council (NERC ; UK) ; NITS ; CAS (China)
出版者GEOLOGICAL SOC AMER, INC
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/231
专题中国科学院南京地质古生物研究所
其他
通讯作者Myrow, Paul M.
作者单位1.Colorado Coll, Dept Geol, Colorado Springs, CO 80903 USA
2.Univ Calif Riverside, Dept Earth Sci, Riverside, CA 92521 USA
3.Univ Oxford, Dept Earth Sci, Oxford OX1 3PR, England
4.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
5.Nanjing Inst Geol & Paleontol, State Key Lab Paleobiol & Stratig, Nanjing 210008, Peoples R China
6.Wadia Inst Himalayan Geol, Dehra Dun 248001, Uttar Pradesh, India
推荐引用方式
GB/T 7714
Myrow, Paul M.,Hughes, Nigel C.,Searle, Michael P.,et al. Stratigraphic correlation of Cambrian-Ordovician deposits along the Himalaya: Implications for the age and nature of rocks in the Mount Everest region[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2009,121(3-4):323-332.
APA Myrow, Paul M.,Hughes, Nigel C.,Searle, Michael P.,Fanning, C. M.,Peng, S-C ,&Parcha, S. K..(2009).Stratigraphic correlation of Cambrian-Ordovician deposits along the Himalaya: Implications for the age and nature of rocks in the Mount Everest region.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,121(3-4),323-332.
MLA Myrow, Paul M.,et al."Stratigraphic correlation of Cambrian-Ordovician deposits along the Himalaya: Implications for the age and nature of rocks in the Mount Everest region".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 121.3-4(2009):323-332.
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