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| 西藏边坝-洛隆地区下白垩统边坝组的建立及其意义 |
| 田立富,朱才伐,向树元,泽仁扎西,陈洁 |
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(1. 石家庄经济学院, 河北石家庄 050031;
2. 中国石油大学, 北京 102200;
3. 中国地质大学, 湖北武汉 430074;
4. 西藏地调院二分院, 西藏拉萨 850012) |
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| 摘要: |
| 边坝组是新建立的一个岩石地层单位。该组与下伏下白垩统多尼组呈整合接触,与上覆上白垩统宗给组呈角度不整合接触关系。岩性以紫红色深灰色粉砂质泥岩夹薄层白云岩为特征,深灰色薄层粉砂质泥岩中产丰富的双壳类化石Trigonioides(Diversitrigonioides)xizangensis-Pleuromya spitiensis组合。边坝组的建立完善了该地区下白垩统地层系统,对冈底斯北缘弧后前陆盆地白垩纪岩相古地理研究具有重要意义。 |
| 关键词: 下白垩统 边坝组 边坝-洛隆 藏东 |
| DOI： |
| 附件 |
| 投稿时间：2007-04-15 |
| 基金项目:中国地质调查局1:25万《嘉黎县幅、边坝县幅》区域地质调查项目(200313000022)。 |
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| Establishment and significance of the Lower Cretaceous Banbar Formation in the Banbar-Lhorong region, Xizang |
| TIAN Li-fu, ZHU Cai-fa, XIANG Shu-yuan, Zerenzhaxi, CHEN Jie |
(1. Shijiazhuang University of Economics, Shijiazhuang 050031, Hebei, China;
2. China University of Petroleum, Beijing 102200, China;
3. China University of Geosciences, Wuhan 430074, Hubei, China;
4. Xizang Institute of Geological Survey, Lhasa 850012, Xizang, China) |
| Abstract: |
| The Banbar Formation is a newly established lithostratigraphic unit in the Banbar-Lhorong region, eastern Xizang. It is in conformable contact with the underlying Lower Cretaceous Duoni Formation and in angular unconformable contact with the overlying Upper Cretaceous Zonggei Formation. The lithology is characterized by the purplish red and dark grey silty mudstone intercalated with thin-bedded dolostone. Abundant bivalve fossils Trigonioides (Diversitrigonioides) xizangensis-Pleuromya spitiensis assemblage occurs in the dark grey silty mudstone.The establishment of the Banbar Formation facilitates the improvement of the Lower Cretaceous stratigraphic systems in this region and has important implications for the examination of the Cretaceous sedimentary facies and palaeogeography in the back-arc foreland basins on the northern margin of the Gangdise zone. |
| Key words: Lower Cretaceous Banbar Formation Banbar-Lhorong region eastern Xizang |