新疆石油地质

新疆石油地质 ›› 2004, Vol. 25 ›› Issue (6): 631-633.

• 油气勘探 • 上一篇    下一篇

巴楚寒武-奥陶系碳酸盐岩微量元素及沉积环境

何宏1, 彭苏萍2, 邵龙义2   

  1. 1.中石化石油勘探开发科学研究院,北京 100083;
    2.中国矿业大学,北京 100083
  • 收稿日期:2004-02-10 修回日期:2004-07-16 发布日期:2021-01-14
  • 作者简介:何宏(1971-),女,陕西汉中人,工程师,沉积学。联系电话:010-82312946

Trace Elements and Sedimentary Settings of Cambrian-Ordovician Carbonates in Bachu Area, Tarim Basin

HE Hong1, PENG Su-ping2, SHAO Long-yi2   

  1. 1. Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China;
    2. China University of Mining and Technology, Beijing 100083, China
  • Received:2004-02-10 Revised:2004-07-16 Published:2021-01-14

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摘要： 研究了塔里木盆地巴楚地区寒武-奥陶系海相碳酸盐岩的微量元素特征,探讨了微量元素的富集机制。分析表明,微量元素的富集与原始沉积环境有着极为密切的关系:微量元素K、Na、Al Fe等含量在开阔台地和台地边缘浅滩均较低,而在台地斜坡带较高;Mn、Cr、Ni、V等元素的含量从浅水到深水总体呈增加之势,因此可以指示古水深的变化。常量元素w(Ca)/1v(Mg)比值在以白云岩为主的蒸发台地、局限台地相中最低,在潮下开阔台地、台地边缘浅滩沉积中则由于白云岩不发育而比较高。开阔台地相x0(Sr)/w(Ba)比值较高,而局限台地相、蒸发台地相则相对较低。碳酸盐岩的微量元素结合常量元素分析可以作为沉积环境判别的有效的标志。

关键词: 塔里木盆地, 巴楚, 寒武系, 奥陶系, 碳酸盐岩, 微量元素, 环境

Abstract: The trace element characteristics of Cambian-Ordovician carbonates in Bachu area of Tarim basin are studied, and their enrichment mechanisms are discussed. The results show that the enrichment of trace elements is closely related to the original sedimentary settings. The contents of trace elements as K, Na, Al and Fe are relatively low in open platform and platform marginal shoal in comparison with relatively high contents in the slope zone. Trace elements as Mn, Cr, Ni and V trend towards increases from shallow to deep water sedimentary settings, thus could be used to indicate relatively changes of paleo-water depth. The w(Ca)/w(Mg) ratio of major elements is relatively low in dolomite-domi-nated evaporate platform and restricted platform facies, while relatively high in open platform and platform marginal shoal deposits where dolomite is not developed. The w(Sr)/ w(Ba) ratio of open platform facies is relatively high, while relatively low in dolomite-dominated evaporate platform and restricted platform facies. Hence, the trace elements together with major elements of carbonates could be used as effective mark for identification of the sedimentary settings in this area.

Key words: Tarim basin, Buchu, Cambrian, Ordovician, carbonate, trace element, setting, environment

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