| 内蒙古科尔沁右翼中旗协和尔斯德中生代火山沉积地层时代研究 |
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| 引用本文： | 付俊彧,那福超,郑少林,钟辉,汪岩,宋维民,孙巍,杨帆.内蒙古科尔沁右翼中旗协和尔斯德中生代火山沉积地层时代研究[J].中国地质,2018,45(1):129-140. |
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| 作者姓名： | 付俊彧 那福超 郑少林 钟辉 汪岩 宋维民 孙巍 杨帆 |
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| 作者单位： | 中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110034,中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110034,中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110034,中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110034,中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110034,中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110034;东北大学资源与土木工程学院, 辽宁 沈阳 110819,中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110034,中国地质调查局沈阳地质调查中心, 辽宁 沈阳 110034;吉林大学地球科学学院, 吉林 长春 130061 |
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| 基金项目： | 中国地质调查局项目（121201207000171401，1212011220435，1212010881212）资助。 |
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| 摘 要： | 内蒙古科尔沁右翼中旗协和尔斯德一带出露一套中生代地层,岩石组合主要为酸性火山碎屑岩、火山碎屑沉积岩夹碎屑沉积岩及酸性火山熔岩。1∶50000区调依据在该套地层上部层位发现的木化石组合确定其时代为中—晚侏罗世,结合岩石组合,将该套地层划分为上侏罗统满克头鄂博组。为了准确厘定该套地层时代,为木化石延限研究及区域生物地层划分对比提供依据,本次研究在低于产木化石层位的酸性火山碎屑岩中采取了锆石测年样品(LA-ICP-MS),获得锆石U-Pb年龄(165±1)Ma,时代为中侏罗世。同时采取了侵入该套地层的斑状细晶闪长岩测年样品,获得锆石年龄(131±1)Ma,限定了地层形成的上限年龄。根据岩性组合的区域对比、测年结果、木化石组合时限、地层产状特征,认为该套地层应划为中侏罗统新民组,是突泉火山-沉积盆地充填物的一部分。
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| 关 键 词： | 协和尔斯德 中生代火山岩 年代学 木化石 新民组 |
| 收稿时间： | 2016/4/14 0:00:00 |
| 修稿时间： | 2017/11/10 0:00:00 |
A study of geological age of the Mesozoic volcanic-sedimentary strata in Xiehe' rside area, Horqin Right Wing Middle Banner, Inner Mongolia |
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| FU Junyu,NA Fuchao,ZHENG Shaolin,ZHONG Hui,WANG Yan,SONG Weiming,SUN Wei and YANG Fan.A study of geological age of the Mesozoic volcanic-sedimentary strata in Xiehe'' rside area, Horqin Right Wing Middle Banner, Inner Mongolia[J].Chinese Geology,2018,45(1):129-140. |
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| Authors: | FU Junyu NA Fuchao ZHENG Shaolin ZHONG Hui WANG Yan SONG Weiming SUN Wei and YANG Fan |
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| Institution: | Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China;College of Resources and Civil Engineering, Northeast University, Shenyang 110819, Liaoning, China,Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China and Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, Liaoning, China;College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China |
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| Abstract: | A suite of Mesozoic strata is exposed in the Xiehe'' rside area of Horqin Right Wing Middle Banner, Inner Mongolia. The lithological association is mainly composed of acidic pyroclastic rock and pyroclastic sedimentary rock intercalated with clastic sedimentary rock and acidic volcanic lava. Based on the fossil woods discovered in the upper layer of the strata by 1:50000 regional survey, the authors hold that the formation time is middle-late Jurassic. Combined with the lithological association, the authors assigned the strata to the Upper Jurassic Manketouebo Formation. In order to accurately redefine the stratigraphic age and provide a basis for the study of the age of fossil woods and the regional biostratigraphic.correlation, the authors collected zircon testing samples from the acidic pyroclastic rock in the horizon lower than that of the fossil woods, and determined that the zircon U-Pb age is (165±1) Ma, belonging to middle Jurassic. In addition, the age of the porphyritic fine-crystalline grained diorite which invaded the strata was obtained, and the zircon U-Pb age is (131±1) Ma, which defines the upper age limit of the strata. According to the regional correlation of lithological associations, dating results, time of fossil woods assemblage,and characteristics of attitude of strata, the authors conclude that the strata should be assigned to Middle Jurassic Xinmin Formation and constitute a part of the filler of Tuquan volcanic-sedimentary basin. |
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| Keywords: | Xiehe''rside Mesozoic volcanic rocks geochronology fossil wood Xinmin Formation |
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