| 内蒙古高尧乌拉白音高老组地质及年代学特征 |
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| 引用本文： | 董培培,李英杰,王根厚,辛后田,王金芳,李红阳.内蒙古高尧乌拉白音高老组地质及年代学特征[J].地质力学学报,2021,27(1):135-152. |
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| 作者姓名： | 董培培 李英杰 王根厚 辛后田 王金芳 李红阳 |
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| 作者单位： | 1.河北地质大学, 河北 石家庄 050031 |
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| 基金项目： | 国家自然科学基金项目（41502211,41972061）;中国地质调查局地质调查项目（1212011120711,12120114064201,DD20190004,DD20160039,DD20160041） |
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| 摘 要： | 通过1:50000区域地质调查,运用"火山构造-岩性岩相-火山地层"三重填图方法,将内蒙古东乌旗高尧乌拉白音高老组划分为3个岩性段,一段为火山碎屑沉积岩,二段为中性火山岩,三段为酸性火山岩,构成一个完整的沉积-喷发旋回。早期至晚期岩浆具有由中性向酸性演化的特征。划分出爆发相、侵出相、溢流相、火山通道相、喷发-沉积相及潜火山相等火山岩相;圈出12个Ⅴ级火山机构。获得高尧乌拉白音高老组二段粗安岩和三段流纹岩的LA-ICP-MS锆石U-Pb年龄分别为128.2±0.9 Ma和125.5±0.5 Ma,表明其形成时代为早白垩世。
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| 关 键 词： | 白音高老组 火山作用 LA-ICP-MS锆石U-Pb定年 高尧乌拉 内蒙古 |
| 收稿时间： | 2019/10/15 0:00:00 |
| 修稿时间： | 2020/3/25 0:00:00 |
Geological and chronological characteristics of the Baiyin'gaolao Formation in Gaoyaowula, Inner Mongolia |
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| DONG Peipei,LI Yingjie,WANG Genhou,XIN Houtian,WANG Jinfang,LI Hongyang.Geological and chronological characteristics of the Baiyin'gaolao Formation in Gaoyaowula, Inner Mongolia[J].Journal of Geomechanics,2021,27(1):135-152. |
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| Authors: | DONG Peipei LI Yingjie WANG Genhou XIN Houtian WANG Jinfang LI Hongyang |
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| Institution: | 1.Heibei GEO University, Shijiazhuang 050031, Hebei, China2.School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China3.Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China |
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| Abstract: | Based on a regional geological survey at a scale of 1:50000, it reveals that the volcanic rocks from the Baiyin''gaolao Formation of Gaoyaowula in Inner Mongolia could be divided into three lithologic segments by the triple mapping method of "volcanic structure-lithology and lithofacies-volcanic formation". The first lithologic segment is composed of pyroclastic sedimentary rocks, the second intermediate volcanic rocks and the third acidic volcanic rocks. The three lithologic segments constitute a complete depositonal-eruptive cycle, and the early to late magma is characterized by a transition from neutral to acid. The Baiyin''gaolao Formation can be classified into eruptive facies, intrusive facies, overflow facies, volcanic vent facies, eruption-deposition facies and subvolcanic facies, etc. Twelve V-grade volcanic apparatuses are delineated. The Zircon U-Pb LA-ICP-MS dating of the trachyandesite from the second lithologic segment of the Baiyin''gaolao Formation of Gaoyaowula and the rhyolite from the third are 128.2±0.9 Ma and 125.5±0.5 Ma respectively, indicating that the formation age is early-Cretaceous. |
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| Keywords: | Baiyin''gaolao Formation volcanism LA-ICP-MS zircon U-Pb dating Gaoyaowula Inner Mongolia |
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