丽水—椒江凹陷月桂峰组沉积物源性质及其物源方向:来自碎屑锆石U-Pb年代学和重矿物成分的证据  

Sediment Provenance and Its Direction of Yueguifeng Formation in Lishui-Jiaojiang Depression:Evidence from Detrital Zircon U-Pb Chronology and Heavy Minerals

作　　者：湛君明 唐友军[1,2] 刘彬[2] 徐雨 伍炼华 王庭旭 陈培[1,2] Zhan Junming;Tang Youjun;Liu Bin;Xu Yu;Wu Lianhua;Wang Tingxu;Chen Pei(Hubei Key Laboratory of Petroleum Geochemistry and Environment,Yangtze University,Wuhan 430100,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education,Yangtze University,Wuhan 430100,China)

机构地区：[1]长江大学油气地球化学与环境湖北省重点实验,湖北武汉430100 [2]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100

出　　处：《地球科学》2024年第4期1339-1351,共13页Earth Science

基　　金：国家自然科学基金(No.41972148).

摘　　要：月桂峰组是丽水-椒江凹陷的主力烃源岩层,但其物源的研究薄弱,给油气勘探带来较大的困难.通过锆石U-Pb测年和重矿物分析等方法,对月桂峰组物源特征、差异及其地质意义进行系统分析对比.结果显示:物源以中酸性火成岩为主,含有少量变质岩,年龄以130~100 Ma为主,主要含有锆石、赤褐铁矿和磁铁矿等稳定重矿物;椒江凹陷与丽水东次凹物源主要来自雁荡凸起,丽水西次凹物源主要来自闽浙隆起带;少量火成岩和变质岩来自研究区附近的基底;锆石圆度偏好和ZTR值较高,说明物源经过中长距离搬运,这有利于中酸性岩浆岩中的石英和长石矿物富集,形成抗压实较好的石英质砂岩储层.Yueguifeng Formation is the main source rock in Lishui-Jiaojiang depression,but it’s poor research on provenance which brings great difficulties to oil and gas exploration.Based on zircon U-Pb dating and heavy mineral analysis,it was systematically analyzed and compared for the provenance characteristics,differences and geological significance of the Yueguifeng Formation.The results show that the provenance is mainly medium-acid igneous rocks main ages of which are 130-100 Ma with a small amount of metamorphic rocks,mainly containing stable heavy minerals such as zircon,hematite and magnetite.The provenance of Jiaojiang depression and east Lishui sub-depression mainly came from Yandang uplift,and the provenance of west Lishui sub-depression mainly came from Fujian-Zhejiang uplift.A small amount of igneous and metamorphic rocks came from the basement near the study area.Zircon roundness preference and ZTR values are higher,indicating that the provenance was transported over medium and long distances,which is conducive to the enrichment of quartz and feldspar minerals in medium-acid magmatic rocks,forming quartz sandstone reservoirs with good compaction resistance.

关 键 词：物源分析 锆石U-Pb同位素定年 重矿物分析 矿床学 

分 类 号：P618[天文地球—矿床学]