准噶尔盆地东南缘侏罗系重矿物演化特征及对博格达山隆升的响应  

Heavy Mineral Evolution Characteristics of Jurassic Deposits in the Southeastern Margin of the Junggar Basin and its Response to Bogda Mountains Uplift

作　　者：郑有伟 王亚东[1] 郭建明[1] 刘兴旺[1] 赵光亮[4] 苏龙[1] 郑建京[1] 

机构地区：[1]甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,兰州730000 [2]中国科学院大学,北京100049 [3]内蒙古科技大学,内蒙古包头014010 [4]中国石油塔里木油田勘探开发研究院,新疆库尔勒841000

出　　处：《沉积学报》2016年第6期1147-1154,共8页Acta Sedimentologica Sinica

基　　金：中国科学院西部行动计划(KZCX2-XB3-12);中国科学院"西部之光"人才培养计划项目(Y404RC1);甘肃省重点实验室专项(1309RTSA041)~~

摘　　要：准噶尔盆地是我国大型含油气盆地之一,其南缘发现了一系列油气田,但博格达山前带油气勘探没有取得大的突破,究其原因可能为博格达山体与周缘凹陷的盆山关系认识不够,以及后期演化对成盆成烃的控制与约束作用认识不够深入。沉积盆地中保存的碎屑物质记录了盆地在沉积过程中周缘造山带岩石圈特征和盆地动力学性质,而沉积重矿物由于其自身的稳定性全程参与在这漫长而复杂的地质过程中,所以碎屑重矿物是源区母岩信息的重要载体。根据重矿物碎屑的磨圆情况、含量变化、组合特征以及不同重矿物指数等矿物岩石学特征,研究侏罗纪时期博格达山隆升过程,为博格达山隆升发生在中侏罗世头屯河时期提供有力的佐证。依据重矿物特征将侏罗纪博格达地区构造演化分为两个阶段:早侏罗世—中侏罗晚期,构造相对稳定阶段;中侏罗晚期—晚侏罗世,构造隆升强烈阶段。并结合前人的构造热年代学、U-Pb年龄,古水流等研究成果,认为在早侏罗世—中侏罗晚期,博格达山地区为汇水沉积区,物源主要来自卡拉美丽山,在中侏罗晚期—晚侏罗世,物源来自于博格达山,认为此时博格达山已经隆升。Junggar basin is one of the largest petroliferous basins in China,although a series of oil and gas fields had been found in the south of the basin,the oil-gas exploration in the fore mountain belt of Bogda Mountain did not make great breakthroughs. The reason may be associated with the few awareness of the evolution of the Bogda Mountain to control,restrain the evolution of the late peripheral sags and the hydrocarbon generation and the basin formation. The conservative fragmentary materials in sedimentary basins had recorded the lithosphere features of the orogenic belts at the margin of the South China block and kinetics characterization of basins during the sedimentary evolution. At the same time,as sedimentary heavy minerals were very stable and they had been participating in this long and complicated geological processes,which could provide the important information to the source rocks. Thus,in this text,based on the mineral petrology characteristics of heavy minerals,such as roundings,content changes,combination features and the different heavy mineral indexes,to study the uplift processes of Bogda Mountain in the period of Jurassic,which could provide strong evidence that Bogda Mountain uplifted in Toutunhe Formation of Middle Jurassic. Moreover,according to the features of heavy minerals,the tectonic evolution stages of Bogda Mountain during Jurassic period were divided into two parts： 1） from early Jurassic to the late period of middle Jurassic,the tectonic evolution was relatively stable,and 2） from the late period of middle Jurassic to late Jurassic,tectonic uplifting was strong. In addition,combined with the previous research results such as tectono-thermochronology,U-Pb age and paleocurrent,we considered that the provenances of Bogda area were from Kalameili Montain during early Jurassic to the late period of middle Jurassic and Bogda Mountain during the late period of middle Jurassic to late Jurassic. And that,in the later period,the Bogda Mountain had been uplifted.

关 键 词：准噶尔盆地 东南缘 侏罗系 重矿物分析 博格达山 隆升 

分 类 号：P534.52[天文地球—古生物学与地层学] P597.3[天文地球—地质学]