引用本文:黄韶春, 龚臣, 彭建华, 杨志龙, 何俊.西藏措勤打加错地区上三叠统江让组的发现及其地质意义[J].沉积与特提斯地质,2014,(1):95-101.[点击复制]
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西藏措勤打加错地区上三叠统江让组的发现及其地质意义
黄韶春,龚臣,彭建华,杨志龙,何俊
0
(江西省地质调查研究院, 江西 南昌 330201)
摘要:
在西藏措勤打加错地区新发现上三叠统江让组,其为一套海相碎屑岩及碳酸盐岩沉积建造,岩性主要为不等厚层状石英质砾岩、深灰色薄层状-块状生物碎屑微晶灰岩、含砂粉砂质微晶灰岩、含石英砾质生物碎屑灰岩、砂屑灰岩夹钙质细砂岩,产珊瑚Distichophyllia sp.,Volzeia sp.,Montlivaltia sp.,M.cf.xainzaensis、海绵:Hartmanina sp.和双壳类Xenocardita ?sp.,时代为晚三叠世卡尼期-诺利期,与下二叠统昂杰组呈角度不整合接触。江让组在该地区的发现,完善了冈底斯西部三叠纪的地层系统,为研究印支运动对冈底斯西部的影响和古特提斯洋的演化提供了依据。
关键词:  江让组  上三叠统  角度不整合  印支运动  冈底斯西部  西藏
DOI:
投稿时间:2013-06-06修订日期:2013-06-24
基金项目:致谢:本文为1:5万打加错地区区调成果之一.化石由中国科学院南京地质古生物研究所邓占球研究员鉴定;参加野外地质调查的还有温华、蔡青龙、李国辉等同志;本文在成文过程中承蒙江西省地质调查研究院凌联海教授级高工的指导,在此深表感谢.
The discovery and significance of the Upper Triassic Jiangrang Formation in the Daggyai Lake area, Xizang
HUANG Shao-chun, GONG Chen, PENG Jian-hua, YANG Zhi-long, HE Jun
(Jiangxi Institute of Geological Survey, Nanchang 330201, Jiangxi, China)
Abstract:
The Upper Triassic Jiangrang Formation newly discovered in the Daggyai Lake area, Coqen, Xizang is built up of a succession of sedimentary formation composed of mixed marine clastic rocks and carbonate rocks. Lithologically, these rocks include bedded quartzose conglomerates, dark grey thin-bedded to massive bioclastic micritic limestones, sand-bearing silty micritic limestones, quartz-bearing gravelly bioclastic limestones and sandy limestones intercalated with calcareous fine-grained sandstones, in which there occur the Carnian-Norian (Late Triassic) organic fossils such as the corals Distichophyllia sp., Volzeia sp., Montlivaltia sp. and M. cf. xainzaensis, the sponges Hartmanina sp., and the bivalves Xenocardita ? sp.. The Jiangrang Formation displays an angular unconformable contact with the Lower Permian Angjie Formation. The discovery of the Jiangrang Formation will improve the Triassic stratigraphic systems in western Gangdise, and may provide the new evidence for the better understanding of the Indosinian movements in western Gangdise and the evolution of the PalaeoTethys.
Key words:  Jiangrang Formation  Upper Triassic  angular unconformity  Indosinian orogeny  western Gangdise  Xizang

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