| 西藏日喀则群昂仁组时代问题新资料 |
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| 引用本文： | 钱定宇,章树民,顾庆阁.西藏日喀则群昂仁组时代问题新资料[J].地质科学,1982,0(3):329-332. |
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| 作者姓名： | 钱定宇 章树民 顾庆阁 |
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| 作者单位： | 西藏地质局 |
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| 摘 要： | 昂仁组是一套复理石和类复理石沉积,含晚白垩世土伦期的菊石Mammites1,2],但因未发现直接的上覆地层和化石稀少而不能肯定是否还包括晚于土伦期或至早第三纪的沉积1,3]。1980年,笔者在昂仁、萨噶一带的昂仁组中采到瓣鳃、腹足化石;我局区调队在仲巴县错江顶一带,发现连续沉积于昂仁组之上,整合于下第三系之下一套含Masstrichtian期菊石(Sphenodiscus)的杂色地层。本文报道这一发现和对昂仁组时代问题的认识(图1)。
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| 关 键 词： | , |
| 收稿时间： | 1981-09-14 |
| 修稿时间： | 1981-09-14; |
SOME NEW DATA ON THE AGE OF THE NGAMRING FORMATION OF THE XIGAZE GROUP IN SOUTHERN XIZANG (TIBET),CHINA |
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| Qian Dingyu,Zhang Shumin,Gu Qingge.SOME NEW DATA ON THE AGE OF THE NGAMRING FORMATION OF THE XIGAZE GROUP IN SOUTHERN XIZANG (TIBET),CHINA[J].Chinese Journal of Geology,1982,0(3):329-332. |
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| Authors: | Qian Dingyu Zhang Shumin Gu Qingge |
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| Institution: | The Geological Bureau of Xizang Autonomous Segion, China |
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| Abstract: | According to a new horizon in the stratigraphieal section from Late Cretaceous to Early Tertiary at Cojiangding lake area,40km north of Zhongba County together with some mollusca fossils from formerly Ngamring formation in the district between Ngamring and Saga Counties,the age and stratigraphical position of the Ngamring formation of the Xigaze group are discussed herein.It is suggested that the Ngamring formation only represents these deposits ranging in age from Turonian to Pre-Maastrichtian stages.A suite of variegated rocks located between Ngamring formation and lower Tertiary rocks,consisting of marl,mudstone and siltstone interbeded with bioclastic limestone with Maastrichtian ammonites (Sphenodiscus),may represent the highest strati-graphical horizon of Late Cretaceous in this region. |
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| Keywords: | , |
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