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• 沉积学与地层学 • 上一篇    下一篇

西藏改则热那错地区上三叠统日干配错组碳酸盐岩C、O同位素特征及其地质意

侯恩刚,高金汉,王训练,王根厚,胡歆睿,马占川   

  1. 中国地质大学(北京) 地球科学与资源学院,北京100083
  • 出版日期:2013-12-16 发布日期:2014-02-21
  • 作者简介:侯恩刚,男,博士研究生,1981年出生,古生物学与地层学专业,主要从事综合地层学方面的研究工作。 Email:houengang@cugb.edu.cn
  • 基金资助:

    中国地质调查局项目(2-5-2011-67);中央高校基本科研业务费项目(2011YYL118)。

Characteristics of Carbon and Oxygen Isotopes of Carbonate Rocks in Riganpeicuo Formation of Upper Triassic in Renacuo Area of Gaize,  Tibet and Its Geological Significance

HOU Engang, GAO Jinhan, WANG Xunlian, WANG Genhou, HU Xinrui, MA Zhanchuan   

  1. School of Earth Sciences and Resources, China University of Geoscience, Beijing100083,China
  • Online:2013-12-16 Published:2014-02-21

摘要:

西藏改则热那错地区位于南羌塘盆地南缘,在该区发育了一套厚度较大的碳酸盐岩沉积。对该区碳酸盐岩C、O稳定同位素的研究,可以恢复其形成的古环境及沉积特征。在野外剖面测制(1∶2 000)、样品系统采集的基础上,对其碳酸盐岩进行C、O同位素的测试及分析,结果表明:西藏改则热那错地区古海水盐度Z值为12632~13537,属正常海水—超咸水;古海水温度平均值为224 ℃,代表温暖的气候环境;δ18O、δ13C值均随海平面的变化而变化,海水越深,δ18O值越大。根据C、O同位素计算出的古温度、古盐度与所划分的沉积相带是相互对应的。

关键词: C、O同位素, 古环境, 上三叠统日干配错组, 西藏改则热那错

Abstract:

The Renacuo area of Gaize, Tibet, in the southern Qiangtang Basin, shows a series of strikingly thick carbonate layersResearch on C and O isotopes in the area plays an important role in the reconstruction of the paleoenvironment and the identification of the sedimentary characteristicsBased on the geological map of the lithostratigraphy (1∶2,000), the numerous samples collected in the field and analysis of the C and O isotopes, the Z values of salinity from 12632 to 13537, which indicates that the paleoseawater in the Renacuo area of Gaize ranges from normal marine to hypersalineIn addition, the average temperature of the paleoseawater is 224 ℃, firm evidence of a warm climateBoth the rates of δ18O and δ13C vary with respect to the sea level: the deeper the seawater, the higher the δ18OThe paleotemperature and paleosalinity from the determination of C and O isotopes closely reflect the related sedimentary facies

Key words: carbon and oxygen isotope, paleoenvironment, Riganpeicuo Formation of Upper Triassic, Renacuo area of Gaize, , Tibet

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