东海陆架盆地椒江凹陷锆石U-Pb定年及意义
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摘要
为确定东海陆架盆地椒江凹陷前新生代沉积基底的年龄,并对凹陷内断陷期的沉积物源进行示踪研究,选取了椒江凹陷内典型钻孔中的岩屑样品进行锆石U-Pb定年分析测试,并和已有研究成果进行了对比研究。椒江凹陷前新生代基底以岩浆岩为主,碎屑锆石年龄分布特征复杂,主峰值年龄为227 Ma,主要形成于印支晚期,形成环境属于大洋岛弧环境,和丽水东次凹及雁荡低凸起等已有岩浆记录具有一致性;断陷末期古新统明月峰组碎屑锆石具典型岩浆岩特征,其锆石主峰年龄集中在140～90 Ma,其形成环境属于大陆边缘环境。椒江凹陷古新世物源较为单一,与丽水东次凹具有较大可对比性,东部的雁荡低凸起为其古新世断陷期持续提供物源供应。
Using zircon U-Pb dating as the main analysis method, the age of the pre-Cenozoic sedimentary basement was determined and the sediment source in the sag during the fault depression was traced in the Jiaojiang Sag, East China Sea Shelf Basin. The pre-Cenozoic basement of Jiaojiang Sag is dominated by magmatic rocks. The age distribution of detrital zircons is complex, with the main peak age of 227 Ma, mainly formed in the late Indosinian period. The formation environment belongs to the oceanic island arc environment, which is consistent with the existing magmatic records of Lishui East Sub-Sag and Yushandang Low Uplift. The clastic zircons of the Paleocene Mingyuefeng Formation have typical magmatic characteristics, with the main zircon peak ages ranging from 140 Ma to 90 Ma. The formation environment belongs to a continental margin environment. The Paleocene provenance of Jiaojiang Sag is relatively single, which is comparable to Lishui Eastern Sub-Sag. The Yandang Low Uplift in the east of Jiaojiang Sag provides a continuous provenance supply during the Paleocene fault depression.
Using zircon U-Pb dating as the main analysis method, the age of the pre-Cenozoic sedimentary basement was determined and the sediment source in the sag during the fault depression was traced in the Jiaojiang Sag, East China Sea Shelf Basin. The pre-Cenozoic basement of Jiaojiang Sag is dominated by magmatic rocks. The age distribution of detrital zircons is complex, with the main peak age of 227 Ma, mainly formed in the late Indosinian period. The formation environment belongs to the oceanic island arc environment, which is consistent with the existing magmatic records of Lishui East Sub-Sag and Yushandang Low Uplift. The clastic zircons of the Paleocene Mingyuefeng Formation have typical magmatic characteristics, with the main zircon peak ages ranging from 140 Ma to 90 Ma. The formation environment belongs to a continental margin environment. The Paleocene provenance of Jiaojiang Sag is relatively single, which is comparable to Lishui Eastern Sub-Sag. The Yandang Low Uplift in the east of Jiaojiang Sag provides a continuous provenance supply during the Paleocene fault depression.
引文
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[18] 陈春峰,钟锴,朱伟林,等.东海丽水凹陷物源及其对储层物性影响[J].石油与天然气地质,2017,38(5):963-972.CHEN Chunfeng,ZHONG Kai,ZHU Weilin,et al.Provenance of sediments and its effects on reservoir physical properties in Lishui Sag,East China Sea Shelf Basin[J].Oil & Gas Geology,2017,38(5):963-972.
[19] 秦兰芝,刘金水,李帅,等.东海西湖凹陷中央反转带花港组锆石特征及物源指示意义[J].石油实验地质,2017,39(4):498-504.QIN Lanzhi,LIU Jinshui,LI Shuai,et al.Characteristics of zircon in the Huagang Formation of the central inversion zone of Xihu Sag and its provenance indication[J].Petroleum Geology and Experiment,2017,39(4):498-504.
[20] DIWU C R,SUN Y,Yuan H,et al.U-Pb ages and Hf isotopes for detrital zircons from quartzite in the Paleoproterozoic Songshan Group on the southwestern margin of the North China Craton[J].Chinese Science Bulletin,2008,53(18):2828-2839.
[21] LUDWIG K R,Isoplot 3.00:a geochronological toolkit for Microsoft Excel[M].Berkeley,California:Berkeley Geochronology Center,2003.
[2] 张建培,张田,唐贤君.东海陆架盆地类型及其形成的动力学环境[J].地质学报,2014,88(11):2033-2043.ZHANG Jianpei,ZHANG Tian,TANG Xianjun.Basin type and dynamic environment in the East China Sea Shelf Basin[J].Acta Geologica Sinica,2014,88(11):2033-2043.
[3] 姜涌泉.东海基底性质及其油气地质意义[J].中国海上油气(地质),1990,4(5):19-27.JIANG Yongquan.Nature of basement in East China Sea Basin & its petroleum geologic significance[J].China Offshore Oil and Gas (Geology),1990,4(5):19-27.
[4] 王长势,朱伟林,陈春峰,等.东海丽水—椒江新生代凹陷基底的岩性及分布[J].同济大学学报(自然科学版),2014,42(4):636-644.WANG Changshi,ZHU Weilin,CHEN Chunfeng,et al.Basement lithology and distribution of Lishui-Jiaojiang Cenozoic Sag in East China Sea[J].Journal of Tongji University (Natural Science),2014,42(4):636-644.
[5] 郭真,高顺莉,王建强,等.东海丽水凹陷新生代基底岩体锆石U-Pb年龄及其构造意义[J].海洋通报,2015,34(6):675-687.GUO Zhen,GAO Shunli,WANG Jianqiang,et al.U-Pb dating of the zircon from Cenozoic basement rock and its tectonic significance in the Lishui Sag of the East China Sea Shelf Basin[J].Marine Science Bulletin,2015,34(6):675-687.
[6] 周新民.对华南花岗岩研究的若干思考[J].高校地质学报,2003,9(4):556-565.ZHOU Xinmim.My thinking about granite geneses of South China[J].Geological Journal of China Universities,2003,9(4):556-565.
[7] 王德滋,沈渭洲.中国东南部花岗岩成因与地壳演化[J].地学前缘,2003,10(3):209-220.WANG Dezi,SHEN Weizhou.Genesis of granitoids and crustal evolution in Southeast China[J].Earth Science Frontiers,2003,10(3):209-220.
[8] 贾成业,夏斌,王核,等.东海陆架盆地丽水凹陷构造演化及油气地质分析[J].天然气地球科学,2006,17(3):397-401.JIA Chengye,XIA Bin,WANG He,et al.Characteristic of tectonic evolution and petroleum geology in Lishui Sag,East China Sea Basin[J].Natural Gas Geoscience,2006,17(3):397-401.
[9] 杨传胜,李刚,栾锡武,等.东海陆架盆地雁荡低凸起综合地球物理解释及其成因探讨[J].地球物理学报,2014,57(9):2981-2992.YANG Chuansheng,LI Gang,LUAN Xiwu,et al.The geophysical interpretation of Yandang Low Uplift and discussion on its genesis in the East China Sea Shelf Basin[J].Chinese Journal of Geophysics,2014,57(9):2981-2992.
[10] 王毅,姜亮,杨伟利.丽水—椒江凹陷断裂构造运动学[J].地质科学,2000,35(4):441-448.WANG Yi,JIANG Liang,YANG Weili.Kinematical analysis on faults in the Lishui-Jiaojiang Sag[J].Acta Geologica Sinica,2000,35(4):441-448.
[11] 张胜利,夏斌.丽水-椒江凹陷构造演化特征与油气聚集[J].天然气地球科学,2005,16(3):324-328.ZHANG Shengli,XIA Bin.Characters of tectonic evolution of the Lishui-Jiaojiang Sag and oil accumulation[J].Natural Gas Geoscience,2005,16(3):324-328.
[12] 刘俊海,杨香华,于水,等.东海盆地丽水凹陷古新统沉积岩的稀土元素地球化学特征[J].现代地质,2003,17(4):421-427.LIU Junhai,YANG Xianghua,YU Shui,et al.The REE geochemical characteristics of Paleocene-Eocene in the Lishui Sag of the Donghai Basin[J].Geoscience,2003,17(4):421-427.
[13] 陈国俊,李超,梁建设,等.东海陆架盆地瓯江凹陷明月峰组沉积相及沉积特征分析[J].天然气地球科学,2011,22(5):760-769.CHEN Guojun,LI Chao,LIANG Jianshe,et al.Sedimentary facies of Mingyuefeng Formation in Oujiang Sag,East China Sea Basin[J].Natural Gas Geoscience,2011,22(5):760-769.
[14] 田兵,李小燕,庞国印,等.叠合断陷盆地沉积体系分析—以东海丽水—椒江凹陷为例[J].沉积学报,2012,30(4):696-705.TIAN Bing,LI Xiaoyan,PANG Guoyin,et al.Sedimentary systems of the superimposed rift-subsidence basin:taking Lishui-Jiaojiang Sag of the East China Sea as an example[J].Acta Sedimentologica Sinica,2012,30(4):696-705.
[15] 崔敏,赵志刚.东海盆地丽水凹陷油气成藏制约因素分析[J].特种油气藏,2015,22(2):18-21.CUI Min,ZHAO Zhigang.Constraint analysis of lishui sag hydrocarbon accumulation in Donghai Basin[J].Special Oil & Gas Reservoirs,2015,22(2):18-21.
[16] 付晓伟,朱伟林,陈春峰,等.丽水—椒江凹陷西斜坡明月峰组上段碎屑锆石物源[J].地球科学(中国地质大学学报),2015,40(12):1987-2001.FU Xiaowei,ZHU Weilin,CHEN Chunfeng,et al.Detrital zircon provenance of Upper Mingyuefeng Formation in west slope of Lishui-Jiaojiang Sag,the East China Sea[J].Earth Science(Journal of China University of Geosciences),2015,40(12):1987-2001.
[17] 付晓伟,朱伟林,钟锴,等.东海丽水凹陷晚古生代碎屑锆石的发现及其意义[J].同济大学学报(自然科学版),2015,43(6):924-931.FU Xiaowei,ZHU Weilin,ZHONG Kai,et al.Discovery of Late Paleozoic detrital zircons in Lishui Sag,East China Sea,and its Significance[J].Journal of Tongji University (Natural Science),2015,43(6):924-931.
[18] 陈春峰,钟锴,朱伟林,等.东海丽水凹陷物源及其对储层物性影响[J].石油与天然气地质,2017,38(5):963-972.CHEN Chunfeng,ZHONG Kai,ZHU Weilin,et al.Provenance of sediments and its effects on reservoir physical properties in Lishui Sag,East China Sea Shelf Basin[J].Oil & Gas Geology,2017,38(5):963-972.
[19] 秦兰芝,刘金水,李帅,等.东海西湖凹陷中央反转带花港组锆石特征及物源指示意义[J].石油实验地质,2017,39(4):498-504.QIN Lanzhi,LIU Jinshui,LI Shuai,et al.Characteristics of zircon in the Huagang Formation of the central inversion zone of Xihu Sag and its provenance indication[J].Petroleum Geology and Experiment,2017,39(4):498-504.
[20] DIWU C R,SUN Y,Yuan H,et al.U-Pb ages and Hf isotopes for detrital zircons from quartzite in the Paleoproterozoic Songshan Group on the southwestern margin of the North China Craton[J].Chinese Science Bulletin,2008,53(18):2828-2839.
[21] LUDWIG K R,Isoplot 3.00:a geochronological toolkit for Microsoft Excel[M].Berkeley,California:Berkeley Geochronology Center,2003.