| 摘要: |
| 上白垩统竟柱山组在西藏措勤地区主要沿班公湖-怒江缝合带、且坎-古昌-阿索断裂带和塔若错北-达瓦错南-秋措麦凹陷带断续分布。主要为一套磨拉石的紫红色碎屑岩,其沉积环境以扇三角洲和三角洲为主。扇三角洲和三角洲的前积层理指示了其进积方向,表明早期物源来自北部,而晚期来自南部的陆源物质增加。竟柱山组磨拉石沉积的发育,是班公湖-怒江缝合带造山运动的证据。 |
| 关键词: 竟柱山组 措勤地区 沉积相 班公湖-怒江缝合带 磨拉石 |
| DOI： |
| 附件 |
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| 基金项目: |
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| Sedimentary characteristics and tectonic implications of the Jingzhushan Formation in the Coqen region,Xizang |
| TANG Xiong, TAO Xiao-feng |
| (College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China) |
| Abstract: |
| The Upper Cretaceous Jingzhushan Formation in the Coqen region,Xizang is arranged along the Bangong Lake-Nujiang suture zone,Qiekan-Goicang-Asog fault and northern Taro Lake-southern Dawa Lake-Qiucuomai depression zone.Lithologically,the Jingzhushan Formation is made up of a suite of purplish red molasse clastic rocks which were laid down in the fan delta and delta environments.The progradational directions indicated by the foreset beddings in these environments suggest an early provenance from the north and an additional late provenance from the south.The development of the molasses deposits in the Jingzhushan Formation has provided a convincing orogenic evidence of the Bangong Lake-Nujiang suture zone. |
| Key words: Jingzhushan Formation Coqen region sedimentary facies Bangong Lake-Nujiang suture zone molasses |
