[an error occurred while processing this directive] 世界地质 2018, 37(4) 1018-1032 DOI:   10.3969/j.issn.1004-5589.2018.04.003  ISSN: 1004-5589 CN: 22-1111/P
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锆石LA-ICP-MS U-Pb定年
胶-辽-吉活动带
盖州梁屯地区
炭质方解大理岩
高家峪岩组
本文作者相关文章
杨成会
赵辰
崔育菘
刘锦
彭游博
姜春宇
刘文彬
PubMed
Article by Yang C
Article by Zhao C
Article by Cui Y
Article by Liu J
Article by Peng Y
Article by Jiang C
Article by Liu W
辽东半岛盖州市梁屯地区古元古代大理岩的碎屑锆石U-Pb定年及地质意义
杨成会1, 赵辰2,3, 崔育菘1, 刘锦2,3, 彭游博1, 姜春宇1, 刘文彬1
1. 辽宁省地质矿产调查院, 沈阳 110031;
2. 中山大学 地球科学与工程学院, 广州 510275;
3. 广东省地球动力作用与地质灾害重点实验室, 广州 510275
摘要： 通过地层对比、锆石LA-ICP-MS U-Pb定年及岩石地球化学研究限定胶-辽-吉活动带北东段辽东半岛盖州市梁屯地区一套碳酸盐岩建造的原岩形成时代、物质来源和地层归属等。其炭质方解大理岩锆石阴极发光（CL）图像显示碎屑锆石核部大都具有振荡环带，且其Th/U比值较高（Th/U=0.15~2.04），表明其为岩浆来源成因。锆石U-Pb年代学定年结果显示存在两个主要的年龄峰值，主要年龄峰值为新太古代晚期（2 560~2 500 Ma），次要峰值为古元古代中晚期（2 040~2 000 Ma），其沉积时限应晚于2.0 Ga，与古元古代辽河岩群沉积时代一致。此外，该年龄与区域上的太古代基底和大量出露的辽吉花岗岩的年龄相一致，表明炭质方解大理岩物质来源于太古代基底和辽吉花岗岩。并通过岩相学、岩石地球化学、年代学和区域对比等研究，确认梁屯地区分布的这套富含炭质的大理岩建造（原岩为沉积石灰岩）可与辽河群高家峪岩组对比，而非前人认为的大石桥岩组。
关键词： 锆石LA-ICP-MS U-Pb定年   胶-辽-吉活动带   盖州梁屯地区   炭质方解大理岩   高家峪岩组  
Detrital zircon U-Pb geochronology of Paleoproterozoic marble from Liangtun area of Gaizhou in Liaodong Peninsula and its geological significance
YANG Cheng-hui1, ZHAO Chen2,3, CUI Yu-song1, LIU Jin2,3, PENG You-bo1, JIANG Chun-yu1, LIU Wen-bin1
1. Liaoning Survey Academy of Geology and Mineral Resources, Shenyang 110031, China;
2. School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;
3. Guangdong Provincial Key Lab of Geodynamics and Geohazards, Guangzhou 510275, China
Abstract: The depositional age, provenance and stratigraphic attribution of the protolith of the carbonate formation in Liangtun area, Gaizhou, Liaodong Peninsula, northeastern section of Jiao-Liao-Ji belt are delineated via stratigraphic correlation, zircon LA-ICP-MS U-Pb dating and geochemistry. The cathodoluminescence image of carbon-based calcite marble shows that the zircons have oscillatory zoning, and they are characterized by high Th/U ratios(Th/U=0.15~2.04), indicating magmatic origin. The U-Pb chronological analysis reveals two peak ages, of which the main peak age is Late Neoarchean(2 560~2 500 Ma), whereas the minor peak age is Mid-Late Paleoproterozoic(2 040~2 000 Ma). The depositional age is later than 2.0 Ga, which is consistent with the Liaohe Group. In addition, the age is completely consistent with the Archean basement and Liao-Ji granitoids,indicating that the Archean basement and Liao-Ji granitoids are the major provenance of the carbon-based calcite marble. Combined with petrography,geochemistry,chronology and regional correlation, it is concluded that the carbon-based calcite marble(from sedimentary limestone protolith)within Liangtun area can be correlated with Gaojiayu Formation, rather than Dashiqiao Formation.
Keywords: zircon LA-ICP-MS U-Pb dating   Jiao-Liao-Ji belt   Liangtun area of Gaizhou   carbon-based calcite marble   Gaojiayu Formation  
收稿日期 2018-05-09 修回日期 2018-07-11 网络版发布日期  
DOI: 10.3969/j.issn.1004-5589.2018.04.003
基金项目:

中国地质调查局辽东-吉南成矿带永吉-凤城地区地质矿产调查项目（DD20160049）.

通讯作者: 赵辰(1988-),男,博士,构造地质学专业,从事华北克拉通前寒武纪地质方面研究.E-mail:zhaoch55@mail2.sysu.edu.cn
作者简介:
作者Email: zhaoch55@mail2.sysu.edu.cn
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