| 大兴安岭中南段杜尔基地区早白垩世侵入岩岩石地球化学特征及构造环境 |
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| 引用本文： | 阿木古冷,;吉珍娃,;董德君,;辛本利,;谢振山,;张家利,;赵景军,;刘岩,;张大勇,;康国春,;于福生.大兴安岭中南段杜尔基地区早白垩世侵入岩岩石地球化学特征及构造环境[J].火山地质与矿产,2009(1):1-8. |
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| 作者姓名： | 阿木古冷 ;吉珍娃 ;董德君 ;辛本利 ;谢振山 ;张家利 ;赵景军 ;刘岩 ;张大勇 ;康国春 ;于福生 |
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| 作者单位： | [1]内蒙古自治区115地质队,内蒙古乌兰浩特137400; [2]中国石油大学石油天然气成藏机理教育部重点实验室,北京102249 |
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| 基金项目： | 基金项目：内蒙古自治区1：5万矿调项目资助（批准号：[2005]矿调2-4）. |
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| 摘 要： | 杜尔基地区处于大兴安岭中南段，区内中生代侵入岩广泛发育。八个样品K—Ar全岩法测年结果为100．15～120．29Ma，形成于早白垩世。岩石化学分析结果具有高硅、高钾、富碱、过铝、贫铁、镁、钙特征，属于碱性岩系列。稀土元素总量平均值为146．85μg/g，球粒陨石标准化曲线整体平缓右倾，显示富Rb，贫Sr、Ba特征，具有Eu负异常，微量元素具有明显的Sr、Ba、Ti负异常，反映了具有强烈分异的分离结晶作用存在，说明岩石形成于长期较稳定的构造背景，可能形成于非造山板内裂谷或热点地幔柱环境。
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| 关 键 词： | 内蒙古 大兴安岭 早白垩世 侵入岩 地球化学特征 |
Lithogeochemical characteristics and tectonic setting of Early Cretaceous intrusive rocks form Duerji area in the middle part of Daxin＇an Mountains |
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| Institution: | AMU Gu-leng ,JI Zhen-wa ,DONG De-jun ,XIN Ben-li ,XIE Zhen-shan, ZHANG Jia-li ,ZHAO Jing-jun ,LIU Yan ,ZHANG Da-yong, KANG Guo-chun ,YU Fu-sheng (1. NO. 115 Geological Brigade of Inner Mongolia Bureau of Geological Survey , Wulanhot , 137400,China) (2. Key Laboratory for Hydrocarbon Accumulation Mechanism ,Ministry of Education, University of Petroleum, Beijing , 102249, China) |
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| Abstract: | With wide-spread distribution of Mesozoic intrusive rocks, the Duerji area is located in the middle part of Daxin＇ an Mountains. Eight intrusive rock samples from the area were analyzed for K-Ar isotopes. The K-Ar age of the samples ranges from 100. 15 to 120. 29 Ma, suggesting that the intrusive rocks were formed in the Early Cretaceous. The rock samples are characterized by high Si, K, Ca, which can be regarded as of peraluminous total alkalis and Al, and low Fe, Mg, and alkaline rock series. The average content of ∑REE is 146.85 μg/g, the chondrite-normalized REE patterns display a gently right-clined shape, showing relatively high Rb, low Sr and Ba, with negative Eu anomalies. The primitive mantle-normalized trace elements spidergram is characterized by significant negative anomalies of Sr, Ba, Ti, resembling the intensive crystallization differentiation, long-term stability of tectonic settings and atectonic within-plate rift or hot spot plume environments during the formation of the intrusive rocks. |
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| Keywords: | Daxin＇ an Mountains Early Cretaceous intrusive rocks geochemicalcharacteristics |
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