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引用本文:徐琳,胡林,肖进,李宁,伊海生,赵宇. 西藏措勤盆地下二叠统—下三叠统碳酸盐岩牙形石生物地层划分[J]. 中国地质, 2021, 48(6): 1781-1789.
XU Lin,HU Lin,XIAO Jin,LI Ning,YI Haisheng,ZHAO Yu. Conodont biostratigraphic division of Lower Permian-Lower Triassic carbonate rocks in Cuoqin Basin, Tibet[J]. Geology in China, 2021, 48(6): 1781-1789(in Chinese with English abstract).
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西藏措勤盆地下二叠统—下三叠统碳酸盐岩牙形石生物地层划分
徐琳1, 胡林1, 肖进1, 李宁1, 伊海生2, 赵宇3
1.四川省地质矿产勘查开发局川西北地质队, 四川 绵阳 621000;2.成都理工大学沉积地质研究院, 四川 成都 610059;3.西藏自治区地质矿产勘查开发局第六地质大队, 西藏 拉萨 851400
摘要:
措勤盆地下二叠统昂杰组之上广泛发育碳酸盐岩沉积,前人先后对这套碳酸盐岩进行了解体,建立了多个地层单元。本次报道剖面为盆地中的二叠系-三叠系的连续整合沉积剖面,通过牙形石研究在这套碳酸盐岩中识别出了下二叠统-下三叠统的5个牙形石带,即:Mesogondolella siciliensis-Sweetognathodus subsymmetricus带、Mesogondolella idahoensis带、Jingondolella aserrata带、Clarkina meishanensis带、Neospathodus dieneri带,并将下拉组时代修订为下二叠统空谷期-中二叠统末。
关键词:  下拉组  桑穷组  文布当桑组  嘎仁错组  牙形石  地质调查工程  措勤盆地  西藏
DOI:10.12029/gc20210610
分类号:P534.46;P534.51
基金项目:中国地质调查局项目(DD20160160)资助。
Conodont biostratigraphic division of Lower Permian-Lower Triassic carbonate rocks in Cuoqin Basin, Tibet
XU Lin1, HU Lin1, XIAO Jin1, LI Ning1, YI Haisheng2, ZHAO Yu3
1.Northwest sichuan geological team, Sichuan bureau of exploration and development of geology and mineral resources, Mianyang 621000, Sichuan, China;2.Institute of sedimentary geology, chengdu university of technology, Chengdu 610059, Sichuan, China;3.The sixth geological brigade of the bureau of geology and mineral exploration and development of the Tibet autonomous region, Lhasa 851400, Tibet, China
Abstract:
Carbonate sediment is widely developed above Lower Permain Angjie Formation in Coqin basin,which was disintegrated by previous research to establish several formations. Five conodont zones of Lower Permian-Lower Triassic were identified in the carbonate rocks through conodont studies, namely Mesogondolella siciliensis -Sweetognathodus subsymmetricu zone, Mesogondolella idahoensis zone, Jingondolella aserrata zone, Clarkina meishanensis zone, Neospathodus dieneri zone, and the stratigraphic age of the Xiala Formation was constrained at Lower Permian Kungurian-the later of Middle Permian.
Key words:  Xiala Formation  Sangqiong Formation  Wenbudangsang Formation  Garencuo Formation  Conodont  geological survey engineering  Coqen Basin  Tibet