| 中国西藏南部喜马拉雅相的乐平统 |
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| 引用本文： | 沈树忠,梅仕龙,等.中国西藏南部喜马拉雅相的乐平统[J].地质学报,2002,76(4):454-461. |
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| 作者姓名： | 沈树忠 梅仕龙 |
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| 作者单位： | 1. 中国科学院南京地质古生物研究所,210008
2. 中国地质大学地球科学学院,北京,100083 |
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| 基金项目： | 国家自然科学基金(编号 40072012),国家重点基础研究发展规划项目(编号 G2000077700)
中国科学院“引进海外杰出人才计划”
南京地质古生物研究所开放室基金(003107)共同资助成果 |
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| 摘 要： | 西藏南部二叠系色龙群,曲布日嘎组等“喜马拉雅相”地层产有冈瓦纳区系的以Siriferella rajah,Taeniothaerus densipustulatus,Neospirifer(Neospirifer)kubeiensis和Retimarginifera xizangensis为典型代表的腕足动物群。其组成和演进层序与属于冈瓦纳大陆北缘的巴基斯坦盐岭的Wargal组上部和Chhidru组,克什米尔的Zewan组,印度斯匹提Kuling页岩上部的Gngrei组,尼泊尔西北部的Senja组和澳大利亚西部Hardman组的很接近;时代曾被归入瓜达鲁普世或乐平世早期等,分歧较大。近年来在盐岭等地发现这一冈瓦纳区系动物群明显高于乐平世一部牙形类Clarkina dukouensis带,并与菊石Cyclolbus和有孔虫Claniella动物群共生。由此推定整个色龙群或曲布组和曲布日嘎组都应属于乐平统,它与上覆三叠系以牙形类化石Hindeodus parvus和菊石Otoceras出现为界,代表冈瓦纳大陆北缘乐平世沉积的一个三级地层层序。层序以海进初期沉积的低水位体系域的曲布组石英砂岩为标志,其顶界则为比二叠系－三叠系界线略低的一个快速海进面。
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| 关 键 词： | 喜马拉雅相 西藏 乐平统 喜马拉雅地区 色龙群 地层层序 腕足动物群 |
| 修稿时间： | 2001年9月10日 |
The Himalayan Lopingian Series (Late Permian) in Southern Tibet, China |
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| SHEN Shuzhong,CAO Changqun,WANG Xiangdong,MEI Shilong,JIN Yugan Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing, School of Geosciences,China University of Geosciences.The Himalayan Lopingian Series (Late Permian) in Southern Tibet, China[J].Acta Geologica Sinica,2002,76(4):454-461. |
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| Authors: | SHEN Shuzhong CAO Changqun WANG Xiangdong MEI Shilong JIN Yugan Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing School of Geosciences China University of Geosciences |
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| Abstract: | Investigations into three Permian-Triassic sections (the Selong Xishan, Qubu and Tulong sections) suggest the widespread distribution of the Lopingian Series (Late Permian) and the continuous Permian-Triassic bound-ary in southern Tibet. The Lopingian series in southern Tibet is characterized by containing typical Gondwana-type brachiopods such as Taeniothaerus, Fusispirifer, Neospirifer (Neospirifer) kubeiensis, Retimarginifera xizangensis and Spiriferella rajah, which suggest a correlation with those known from the upper part of the Wargal and Chhidru Formations in the Salt Range, Pakistan, the Zewan Formation in Kashmir, the Basleo Bed in West Timor, the Senja Formation in Northwest Nepal and the Hardman Formation in Western Australia. According to the occurrences of the conodont Clarkina dukouensis zone in the middle part of the Wargal Forma-tion and the Clarkina longicuspidata zone in the lower part of the Chhidru Formation, and the association with the ammonoid Cyclolobus and the foraminifer Colaniella fauna in the Salt Range, the Selong Group in the Hi-malayan region, as a whole, is considered to be Lopingian in age.The Himalayan Lopingian Series represents a third-order sequence and can be divided roughly into two dif-ferent sedimentary types. The Qubu-type Lopingian represents deposits developed in restricted coastal environ-ments along the northern peri-Gondwana continental margin. The Qubu Formation in the lower part consists mainly of quartzose sandstone interbedded with black shale containing the Glossopteris flora. The Qubuerga Formation in the upper part is composed of a siltstone- and bioclastic limestone-dominated member in the lower part with abundant brachiopods and a shale- and siltstone-dominated member in the upper part with the Atom-odesma fauna and abundant terrestrial palynomorphs and acritarchs. The Selong-type Lopingian represents a sequence developed on the inner shelf and is composed of the Selong Group dominated by carbonates with nu-merous brachiopods and a Waagenites bed in the lowest Kangshare Formation. |
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| Keywords: | Tibet Lopingian Himalayan region Selong Group Cyclolobus |
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