| 银额盆地哈日凹陷下白垩统热水沉积岩特征及成因 |
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| 引用本文： | 陈志鹏,任战利,于春勇,祁凯,任文波,杨燕,马骞.银额盆地哈日凹陷下白垩统热水沉积岩特征及成因[J].地球科学,2018,43(6):1941-1956. |
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| 作者姓名： | 陈志鹏 任战利 于春勇 祁凯 任文波 杨燕 马骞 |
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| 作者单位： | 西北大学地质学系, 大陆动力学国家重点实验室, 陕西西安 710069 |
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| 基金项目： | 延长油田科研项目资助的成果No.KT2016SFW0001"十三五"国家重大专项No.2017ZX05005002-008国家自然科学基金重点项目No.41630312 |
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| 摘 要： | 银额盆地哈日凹陷下白垩统具有独特的沉积构造和矿物组成.通过开展岩石矿物和地球化学研究，论证其热水成因，探讨沉积环境和形成模式.研究区下白垩统发育方沸石、菱铁矿和白云石等矿物，富含Fe、Mn和Ba等元素，具有高∑REE、LREE富集和负Eu异常的稀土元素特征.结合Fe vs.Mn vs.（Cu+Co+Ni）×10和Ni vs.Co vs.Zn三角图解，证实下白垩统普遍含有热液成分.微量元素及碳氧同位素分析指示热水沉积岩形成于缺氧、封闭的咸水湖泊环境；氧同位素计算形成温度为43.94~86.08 ℃.研究表明，丰富的断裂系统为湖水下渗和热液喷流提供通道，湖水与热液的对流活动为湖盆持续输入热量和成矿离子.此类湖相热水沉积持续时间长、影响范围广，主要受物源供给和热液性质控制，代表一类特殊的沉积模式.
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| 关 键 词： | 湖相热水沉积 地球化学特征 形成温度 热液喷流 银额盆地 下白垩统 石油地质 |
| 收稿时间： | 2018-02-01 |
Characteristics and Genetic Analysis of Hydrothermal Sediment of Lower Cretaceous in Hari Depression,Yin'e Basin |
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| Abstract: | The Lower Cretaceous of the Hari sag in the Yin'e basin has a unique sedimentary structure and mineral composition. The cause, sedimentary environment and formation pattern of the hydrothermal sediment of Lower Cretaceous in Hari depression, Yin'e basin are discussed in this study, based on its mineralogy, petrology and geochemistry. The Lower Cretaceous in Hari depression with lots of minerals including ganalcites, siderite and dolomite, is rich in Fe, Mn and Ba, characterized by high content of ∑REE, enrichment of LREE, and the negative Eu anomaly. Combined with Fe vs. Mn vs. (Cu+Co+Ni)×10 and Ni vs. Co vs. Zn ternary diagrams, it is proved that the Lower Cretaceous received long-term hydrothermal input during deposition. Analyses of trace elements, carbon and oxygen isotopes indicate the anoxic, closed, salty and lacustrine depositional environment. The formation temperatures of carbonate calculated by oxygen isotopes range from 43.94 ℃ to 86.08 ℃. It is concluded that complex faulting system provides the access to the lake water infiltrating down and the hydrothermal fluids upwelling. Moreover, convection activities between the hydrothermal fluids and the lake water continually offer heat and mineral elements to the lake. This type of hydrothermal sedimentation is long enduring and wide ranging, controlled by both terrigenous detrital materials supply and hydrothermal fluid property, which represents a special sedimentary model. |
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