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| 鄂尔多斯盆地三叠－侏罗系的成岩作用及其成藏成矿响应 | |
| 引用本文： | 柳益群,李继红,冯乔,陈法正,邢秀娟,樊爱萍.鄂尔多斯盆地三叠－侏罗系的成岩作用及其成藏成矿响应[J].岩石学报,2009,25(10):2331-2339. |
| 作者姓名： | 柳益群 李继红 冯乔 陈法正 邢秀娟 樊爱萍 |
| 作者单位： | 1. 西北大学大陆动力学教育部重点实验室,西北大学地质学系,西安,710069 2. 山东科技大学,地球科学与信息学院,青岛,266510 3. 核工业208大队,包头,014010 |
| 基金项目： | 国家重点基础研究发展规划973项目 |
| 摘 要： | 鄂尔多斯盆地三叠-侏罗系的成岩作用显示出受周边活动带干扰的类克拉通型特征.来自北部老山的岩浆岩碎屑、铁镁质矿物及火山喷发的火山灰导致在同生.早期成岩阶段孔隙水中释放大量铁、镁、硅、铝等离子,从而析出大量蒙脱石和富铁的绿泥石、沸石类和硅质矿物;在上三叠统中夹有由火山灰成岩转变而成的多层斑脱岩;同时导致富铀碎屑的聚集和由于粘土矿物、褐煤等的吸附作用造成的铀离子的预富集.在中成岩阶段,石油生成并在粘土矿物放出大量孔隙水作为载体的情况下初次运移,有机溶液进入储层使铝硅酸盐矿物溶解产生次生孔隙;同时蒙脱石和伊利石对油和气的生成具有催化作用,显示出典型的有机-无机成岩成藏作用过程.中晚燕山运动是一次构造热事件,此时期发生的表生成岩阶段是鄂尔多斯盆地成藏成矿的重要时期,不但促进了三叠系油和古生界天然气的生成,而且提供了油气运聚成藏的动力学条件;另一方面,天然气向盆地北东向的大规模运移散失造成强还原环境,促使具备铀矿形成条件的东胜地区侏罗系中大型铀矿的形成,是典型的有机-无机成岩成矿作用的结果. |
| 关 键 词： | 有机-无机成岩成矿作用 石油 天然气 煤 铀 鄂尔多斯盆地 |
Diagenesis with its responsivity of ore-forming on Triassic and Jurassic in Ordos basin |
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| LIU YiQun,LI JiHong,FENG Qiao,CHEN FaZheng,XING XiuJuan and FAN AiPing.Diagenesis with its responsivity of ore-forming on Triassic and Jurassic in Ordos basin[J].Acta Petrologica Sinica,2009,25(10):2331-2339. | |
| Authors: | LIU YiQun LI JiHong FENG Qiao CHEN FaZheng XING XiuJuan and FAN AiPing |
| Affiliation: | State Key Laboratory of Continental Dynamics, Northwest University; Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Northwest University; Department of Geology, Northwest University, Xi'an 710069, China;Science and Engineering College, Sandong University of Science and Technology, Qingdao 266510, China;Geologic Party No.208, CNNC, Baotou, Inner Mongolia 014010, China;State Key Laboratory of Continental Dynamics, Northwest University; Department of Geology, Northwest University, Xi'an 710069, China;Science and Engineering College, Sandong University of Science and Technology, Qingdao 266510, China |
| Abstract: | The diagenesis of Triassic-Jurassic in Ordos Basin, revealed the characteristics of quasi-craton, which were influenced by the peripheral active belts of the basin. The volcanic material and ferromagnesian coming from the north ancient mountain, set out abundant Fe2+, Mg2+, Si4+,Al3+to pore water, and formed zeolite and silicoide in syndiagenetic and ealy diagenetic phases. The Bentonite interlayer in Upper Triassic was also formed at same time. The accumulation of riching Uranium clastics, and the pre-concentration of hydronium U caused by adsorption of hydrosyalites and brown coal, was also made in this period. In middle diagenetic phase, the hydrocarbon was created, and made its primary migration carried by the pore water, which was released from hydrosyalites. In this period, organic liquid entered into reservoirs and made the aluminumsilicate minerals dissolved to create secondary pore. Montmorillonite and illite catalysed the creation of oil-gas. All these appeared typical organic-inorganic agency of diagenesis and hydrocarbon accumulation. Hypergene diagenetic phase was important to oil-gas enrichment and minerogenesis in Ordos Baisn. Middle-late Yanshan movement was a tectothermal event, that not only caused the maturation of the oil in Triassic and the gas in palaeozoic, but also provided the dynamic conditions for the migration of oil-gas. On the other hand, strong reducing environment caused by the large-scale migration of gas to north-eastern and the gas's missing in Dongsheng area, contributed to enrichment of large uranium mine in Jurassic, where the hydrographic conditions were available to the accumulation of the uranium mine. So, the enrichment of the uranium mine of Jurassic in Dongsheng area was the result of typical organic-inorganic agency of diagenesis and metallogenesis. |
| Keywords: | Organic-inorganic diagenesis-agency Oil Gas Coal Uranium Ordos basin |
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