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地质科学  2018, Vol. 53 Issue (2): 458-469    DOI: 10.12017/dzkx.2018.025
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鄂尔多斯盆地南缘铜川地区三叠系延长组油页岩中“钙质结核”的成因初探
马 瑶1    李文厚2    刘江斌3    李智超4
  1. 西安石油大学地球科学与工程学院,陕西省油气成藏地质学重点实验室  西安    710065
  2. 大陆动力学国家重点实验室,西北大学地质学系  西安    710069
  3. 延安大学石油工程与环境工程学院  延安    716000
  4. 长安大学  西安    710064
A preliminary discussion on the origin of calcareous concretion in oil shale of Yanchang Formation in Tongchuan area, southern Ordos Basin
Ma Yao1    Li Wenhou2    Liu Jiangbin3    Li Zhichao4
  1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Key Laboratory of Shaanxi Province for Oil and Gas Accumulation Geology, Xi'an 710065
  2. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069
  3. School of Petroleum and Environment Engineering, Yan'an University, Yan'an, Shaanxi 716000
  4. Chang'an University, Xi'an 710064
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摘要 

在鄂尔多斯盆地南缘铜川地区野外露头三叠系延长组长7段油页岩中发现了一些“钙质结核”,野外露头中呈层状发育于长7段油页岩中,形态为“透镜状”、“椭球状”、“飞碟状”,直径大小约为10~70 cm。为探明其岩石类型和主要岩石组分,运用显微镜薄片鉴定、电子探针实验、能谱分析等方法,对结核体进行岩石学特征分析。在此基础上,对其成因进行初步探讨。岩石学特征显示,霸王庄和宜君套滩剖面的“钙质结核”主要成分为重结晶方解石和晶粒方解石,具“球粒状”结构,岩石类型为灰岩;瑶曲聂家河剖面结核体主要岩石类型为泥—粉晶白云岩。分析认为这些“钙质结核”其野外产状和岩石成分,符合热水沉积碳酸盐岩和受热液活动影响的特征,并且铜川地区在长7期具备热液活动的条件。初步认为这些“钙质结核”为湖底热液活动成因的湖相碳酸盐岩。

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马瑶 李文厚 刘江斌 李智超
关键词鄂尔多斯盆地   铜川地区   延长组   油页岩   湖相碳酸盐岩   热液活动   热水沉积碳酸盐岩     
Abstract

Some “calcareous concretion” were found in the oil shale of Chang 7 section of Yanchang Formation in the outcrops of the Tongchuan area, the southern part of the Ordos Basin. These “calcareous concretion” were layered developed in the oil shale of the Chang 7 section in the outcrops, in the form of “lenticular”,“ellipsoid”,“discoid”, about 10~70 cm in diameter. In order to identify the rock type and main rock components, the petrological characteristics of these concretion were analyzed by microscope observation of section, electron microprobe experiment and EDS analysis. On this basis, the origin of these “calcareous concretion” were preliminarily discussed. The “calcareous concretion” in Bawangzhuang and Taotan field section of Tongchuan area are mainly composed of recrystallised calcite and crystalline calcite, with “globular” structure, and its rock type is limestone. The rock type of “calcareous concretion” in Niejiahe field section are silt-micrite dolostone. The results show that these “calcareous concretion” in the field occurence and the composition of the rocks meet the characteristics of hydrothermal exhalative deposition of carbonate rocks and hydrothermal activities. And the Tongchuan area had the condition of hydrothermal activity in the Chang 7 period. It is tentatively believed that these “calcareous concretion” are lacustrine carbonate rocks that contribute to the hydrothermal activity.

Key wordsOrdos Basin   Tongchuan area   Yanchang Formation   Oil shale   Lacustrine carbonate rocks   Hydrothermal activity   Hydrothermal sedimentary carbonate rocks   
收稿日期: 2017-08-10;
基金资助:

国家自然科学青年基金项目(编号:41702117)、国家自然科学重点基金项目(编号:41330315)和陕西省自然科学基础研究青年项目(编号:2017JQ4018)资助。

作者简介: 马瑶,女,1990年3月生,博士,讲师,沉积学和石油地质学专业。E-mail:mayao90s@163.com
引用本文:   
马瑶 李文厚 刘江斌 李智超. 2018, 鄂尔多斯盆地南缘铜川地区三叠系延长组油页岩中“钙质结核”的成因初探. 地质科学, 53(2): 458-469.
Ma Yao Li Wenhou Liu Jiangbin Li Zhichao. A preliminary discussion on the origin of calcareous concretion in oil shale of Yanchang Formation in Tongchuan area, southern Ordos Basin[J]. Chinese Journal of Geology, 2018, 53(2): 458-469.
 
没有本文参考文献
[1] 王飞飞 刘池洋 王建强 邱欣卫 程相虎 李 被 杜芳鹏. 鄂尔多斯盆地延长期沉积中心迁移及其动力学背景[J]. 地质科学, 2018, 53(3): 941-958.
 
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