| 鄂尔多斯盆地上三叠统延长组重矿物的成岩作用 |
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| 引用本文： | 李云,胡作维,贺静,袁效奇,邓秀芹.鄂尔多斯盆地上三叠统延长组重矿物的成岩作用[J].古地理学报,2015,17(1):119-128. |
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| 作者姓名： | 李云 胡作维 贺静 袁效奇 邓秀芹 |
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| 作者单位： | 1.成都理工大学沉积地质研究院, 四川成都 6100592 “油气藏地质及开发工程”国家重点实验室(成都理工大学), 四川成都 6100593 中国石油长庆油田分公司勘探开发研究院, 陕西西安 710018 |
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| 摘 要： | 砂岩中重矿物在埋藏成岩环境中会发生溶蚀甚至形成新的重矿物胶结物。利用重矿物特征进行物源分析是鄂尔多斯盆地上三叠统延长组物源分析的最重要方法之一,但石榴子石、榍石和绿帘石这3种重矿物在成岩作用期间发生了明显的后生变化。研究表明,延长卡中石榴子石发生溶蚀形成粒内溶孔和刻面石榴子石,部分被方解石、绿泥石或硅质交代;见自生榍石晶体及榍石次生加大,且榍石的生长具有多期次性;见自生绿帘石晶体及绿帘石次生加大,部分绿帘石被绿泥石或硅质交代;相对稳定性强的石榴子石部分被溶蚀,而相对稳定性弱的碎屑状榍石、绿帘石并未见到溶蚀现象,这与以往研究中对于重矿物稳定性的认识是不一致的,希望能引起未来研究者的重视。
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| 关 键 词： | 重矿物 石榴子石 绿帘石 榍石 溶蚀 次生加大 重矿物稳定性 |
| 收稿时间： | 2014-09-10 |
Diagenesis of heavy minerals in the Upper Triassic Yanchang Formation of Ordos Basin |
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| LiYun,HuZuowei
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HeJing,YuanXiaoqi
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DengXiuqin.Diagenesis of heavy minerals in the Upper Triassic Yanchang Formation of Ordos Basin[J].Journal of Palaeogeography,2015,17(1):119-128. |
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| Authors: | LiYun HuZuowei HeJing YuanXiaoqi DengXiuqin |
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| Institution: | 1.Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan3.Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, Shaanxi |
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| Abstract: | The heavy minerals in sandstones in the burial diagenetic environment will suffer the solution and even form new heavy mineral cements. Provenance analysis method by using the characteristics of heavy minerals is one of the most important methods in the Upper Triassic Yanchang Formation of Ordos Basin. However,three kinds of heavy minerals, including garnet,sphene and epidote, have changed a lot during their diagenetic stage. Garnet was dissolved and become facet garnet,some was replaced by calcite,chlorite or quartz. The authigenic sphene crystals and sphene overgrowth were discovered,and sphene growth had several times. Authigenic epidote crystals and epidote overgrowths were seen,part of epidotes were replaced by chlorite or quartz. Garnet with relatively strong stability was dissolved,and detrital sphene and epidote with relative weak stability were not dissolved. This phenomenon is not consistent with knowledge of the heavy mineral stability in previous studies,and we hope it could be taken seriously by the researchers in the future. |
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| Keywords: | heavy mineral garnet epidote sphene dissolution overgrowth stability of heavy minerals |
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