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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第40卷

期数:

2018年第03期

页码:

237-251

栏目:

基础地质与矿产地质

出版日期:

2018-05-15

文章信息/Info

Title:

LA-MC-ICP-MS Zircon U-Pb Ages of Kaikukang Formation and Their Tectonic Implications in Mohe Basin, Northeast China

文章编号:

1672-6561(2018)03-0237-15

作者:

杨晓平; 胡道功; 刘晓佳; 张文龙; 汪岩; 王超群

1.中国地质调查局沈阳地质调查中心，辽宁 沈阳 110034； 2.中国地质科学院地质力学研究所，北京 100081； 3.黑龙江省地质调查研究总院齐齐哈尔分院，黑龙江 哈尔滨 150036

Author(s):

YANG Xiao-ping;  HU Dao-gong;  LIU Xiao-jia;  ZHANG Wen-long;  WANG Yan;  WANG Chao-qun

1. Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China; 2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 3. Qiqihar Branch, Heilongjiang Institute of Geological Survey, Harbin 150036, Heilongjiang, China

关键词:

锆石U-Pb年龄; 凝灰岩; 砂岩; 下白垩统; 开库康组; 山间盆地; 逆冲推覆构造; 漠河盆地

Keywords:

zircon U-Pb age;  tuff;  sandstone;  Lower Cretaceous;  Kaikukang Formation;  intermountain basin;  thrust-nappe structure;  Mohe Basin

分类号:

P597

DOI:

-

文献标志码:

A

摘要:

通过对漠河盆地东北部“上侏罗统”开库康组的研究，发现了其与下伏中侏罗统二十二站组之间的不整合面，同时对开库康组砂岩和火山岩夹层进行了LA-MC-ICP-MS锆石U-Pb定年，获得的2个样品中最年轻的碎屑锆石²⁰⁶Pb/²³⁸U加权平均年龄均为159 Ma，反映了沉积下限不早于晚侏罗世；在其内的火山岩夹层中获得的岩浆锆石²⁰⁶Pb/²³⁸U年龄分别为(136.6±1.9)、(137.5±2.5)Ma，该年龄与开库康组内发育的Coniopteris-Phoenicopsis植物群晚期化石组合和Ruffordia-Onychiopsis早期化石组合反映的时代吻合，表明开库康组形成于早白垩世早期，而非原划分的晚侏罗世。开库康组形成时代及其下伏地层锆石U-Pb年龄揭示了构造不整合面形成于137~145 Ma，进一步约束了蒙古—鄂霍茨克洋闭合之后漠河逆冲推覆构造形成时间及从侏罗纪伸展盆地转化为白垩纪挤压山间盆地的时代。开库康组时代的重新厘定对进一步研究漠河盆地与蒙古—鄂霍茨克造山带的关系提供了新的资料。

Abstract:

Based on the geological investigation of “Upper Jurassic” Kaikukang Formation in the northeast of Mohe Basin, Northeast China, an unconformity is found between Kaikukang Formation and the underlying Ershierzhan Formation of Middle Jurassic. Meanwhile, the ages of sandstone on the interlayer and volcanic rocks in Kaikukang Formation were determined by LA-MC-ICP-MS zircon U-Pb dating. The youngest weighted average age of detrital zircon U-Pb is 159 Ma, indicating that the lower limit of deposition is not earlier than Early Cretaceous; the magmatic zircon ²⁰⁶Pb/²³⁸U ages obtained in the interlayer of volcanic rocks are (136.6±1.9)Ma and (137.5±2.5)Ma respectively, and they are in accordance with the age of reflection in the late fossil association of Coniopteris-Phoenicopsis flora and the early fossil association of Ruffordia-Onychiopsis flora in Kaikukang Formation. All these ages and fossils strata comparison results show that Kaikukang Formation forms in the early Early Cretaceous, rather than Late Jurassic classified by previous research. The structural unconformity between Kaikukang Formation and the underlying Ershierzhan Formation should be formed during 137-145 Ma according to the dating results, and this further restricts the formation time of Mohe thrust-nappe structure and the transformation age from Jurassic extensional basin to Cretaceous compresses intermountain basin after Mongolia-Okhotsk ocean closed. This redividing for Kaikukang Formation provides a new geological information for further studying the relationship between Mohe Basin and Mongolian-Okhotsk orogenic belt.

参考文献/References:

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备注/Memo

备注/Memo:

收稿日期:2018-01-25;修回日期:2018-04-04
基金项目:中国地质调查局地质调查项目(DD20160345-17)
作者简介:杨晓平(1969-),男,黑龙江哈尔滨人,高级工程师,E-mail:yangxiaoping0452@163.com。
通讯作者:胡道功(1963-),男,湖北钟祥人,研究员,理学博士,E-mail:hudg@263.net。

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更新日期/Last Update: 2018-06-05