| 辽宁北部秀水盆地下白垩统义县组火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 李晓海,陈树旺,丁秋红,李文博,张健.辽宁北部秀水盆地下白垩统义县组火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2020(5):659-669. |
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| 作者姓名： | 李晓海 陈树旺 丁秋红 李文博 张健 |
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| 作者单位： | 沈阳地质矿产研究所/中国地质调查局沈阳地质调查中心 |
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| 基金项目： | 中国地质调查局项目《松辽盆地外围西部盆地油气基础地质调查》(编号:DD20160163)和《松辽盆地北部及外围石炭-二叠系油气地质调查》(编号:DD20190097) |
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| 摘 要： | 为查明秀水盆地烃源岩层位形成时代,对侵位到秀D1井义县组三段沉积地层中的次火山岩样品和地表发育的义县组火山岩样品,分别进行LA-ICP-MS锆石U-Pb测年,获得火山岩同位素年龄值为121.5±1.2~121.3±3.5 Ma,时代为早白垩世。通过与区域相同时代火山岩同位素年代学对比研究表明,秀水盆地火山岩形成时期为义县组末期火山活动。秀水盆地义县组末期火山岩年龄的确定,不仅确定了义县组末期火山岩形成的上限年龄(121.3 Ma),同时也确定了秀水盆地主力烃源岩层位(义县组三段)的上限年龄(约121 Ma)。明确了义县组三段沉积层作为辽宁西北地区重要的油气勘探目的层系,为松辽盆地外围断陷盆地群油气勘探提供了新的目的层系。
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| 关 键 词： | 义县组 火山岩 U-PB年龄 辽宁北部 秀水盆地 |
LA-ICP-MS zircon U-Pb age of the volcanic rocks of the Lower Cretaceous Yixian Formation in the Xiushui basin of northern Liaoning Province and its geological significance |
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| LI Xiaohai,CHEN Shuwang,DING Qiuhong,LI Wenbo,ZHANG Jian.LA-ICP-MS zircon U-Pb age of the volcanic rocks of the Lower Cretaceous Yixian Formation in the Xiushui basin of northern Liaoning Province and its geological significance[J].Geologcal Bulletin OF China,2020(5):659-669. |
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| Authors: | LI Xiaohai CHEN Shuwang DING Qiuhong LI Wenbo ZHANG Jian |
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| Institution: | (Shenyang Institute of Geology and Mineral Resources,CGS,Shenyang 110034,Liaoning,China) |
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| Abstract: | In order to ascertain the hydrocarbon source strata age of Xiushui basin,LA-ICP-MS zircon U-Pb dating was conducted on the sub-volcanic rocks that was emplaced in the third member of Yixian Formation sedimentary strata in Xiu-D1 well and developed on the surface,which yielded an age of 121.5±1.2~121.3±3.5 Ma,indicating that the sub-volcanic rocks were formed in Early Cretaceous.In comparison with the volcanic rocks in the surrounding areas,the study of isotopic chronology shows that the volcanic rocks in Xiushui basin were formed during the volcanic activity at the end of the formation of Yixian Formation.The determination of the age defines not only the upper age limit(121.3 Ma)of the formation of volcanic rocks but also the upper age limit(121 Ma)of the main hydrocarbon source rocks(the third member of Yixian Formation)in Xiushui basin.The third member of Yixian Formation is an important oil and gas exploration target series in northwest Liaoning Province.It provides a new target series for oil and gas exploration in the peripheral fault basin group of Songliao basin. |
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| Keywords: | Yixian Formation volcanic rocks U-Pb age northern Liaoning Xiushui basin |
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