| 张广才岭南部帽儿山岩体二长花岗岩年代学、地球化学特征及其构造意义 |
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| 引用本文： | 赵越,刘敬党,张国宾,张艳飞.张广才岭南部帽儿山岩体二长花岗岩年代学、地球化学特征及其构造意义[J].吉林大学学报(地球科学版),2021,51(4):1098-1118. |
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| 作者姓名： | 赵越 刘敬党 张国宾 张艳飞 |
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| 作者单位： | 1. 辽宁工程技术大学阜新转型创新发展研究院, 辽宁 阜新 123000;2. 辽宁工程技术大学矿业学院, 辽宁 阜新 123000;3. 中国地质调查局沈阳地质调查中心, 沈阳 110034 |
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| 基金项目： | 辽宁省科技厅基金项目（20170540428）；辽宁省教育厅面上基金项目（LJ2019JL027）；辽宁省教育厅青年科技人才"育苗"项目（LJ2020QNL003） |
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| 摘 要： | 张广才岭是松嫩地块与佳木斯地块之间的碰撞造山带，是东北"巨型花岗岩省"的重要组成部分。本文通过锆石U-Pb定年和岩石地球化学分析，研究了张广才岭南部帽儿山二长花岗岩年代学、地球化学特征和构造背景。锆石U-Pb年代学结果显示：张广才岭南部细粒二长花岗岩成岩年龄为（176.4±1.1）Ma，中粒二长花岗岩成岩年龄为（178.9±1.3）、（177.7±1.1）Ma，粗粒二长花岗岩成岩年龄为（180.0±1.8）、（179.9±1.2）Ma，成岩时代均属于早侏罗世。岩石地球化学研究显示：细粒二长花岗岩、中粒二长花岗岩和粗粒二长花岗岩均具有富硅、贫铝、高碱、低钙，富集Zr、Hf、Rb、K，亏损Ba、Sr、Nb、P、Ti，燕式型稀土配分模式等特征，成岩类型属于造山后A2型花岗岩。结合年代学和地球化学特征，研究区早侏罗世二长花岗岩形成于碰撞后构造背景，代表佳木斯地块和松嫩地块碰撞—拼合过程中的一次伸展作用，表明早侏罗世区域构造环境逐渐由挤压造山向造山后伸展环境转变。
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| 关 键 词： | 张广才岭 早侏罗世 二长花岗岩 锆石U-Pb定年 地球化学 岩石成因 构造背景 |
| 收稿时间： | 2021-01-26 |
Geochronology,Geochemistry and Tectonic Significance of the Monzonitic Granites of Maoershan Pluton from the Southern Zhangguangcai Range in Heilongjiang Province,China |
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| Zhao Yue,Liu Jingdang,Zhang Guobin,Zhang Yanfei.Geochronology,Geochemistry and Tectonic Significance of the Monzonitic Granites of Maoershan Pluton from the Southern Zhangguangcai Range in Heilongjiang Province,China[J].Journal of Jilin Unviersity:Earth Science Edition,2021,51(4):1098-1118. |
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| Authors: | Zhao Yue Liu Jingdang Zhang Guobin Zhang Yanfei |
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| Institution: | 1. Institute of Innovation and Development for Fuxin Transition, Liaoning Technical University, Fuxin 123000, Liaoning, China;2. Mining Institute, Liaoning Technical University, Fuxin 123000, Liaoning, China;3. Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China |
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| Abstract: | The Zhangguangcai Range is a collision orogenic belt between the Songnen massif and the Jiamusi massif, and is an important part of the "Giant Granite Province" in Northeast China. Based on zircon U-Pb dating and petrogeochemical analysis, we have studied the chronology, geochemical characteristics and tectonic setting of the Early Jurassic monzogranites in the southern Zhangguangcai Range. The zircon U-Pb dating results show that the diagenetic age of the fine-grained monzogranite granite sample is (176.4±1.1) Ma; The medium-grained monzogranite samples are(178.9±1.3)Ma,(177.7±1.1)Ma; The coarse-grained monzogranite samples are(180.0±1.8)Ma, (179.9±1.2)Ma. These ages belong to the Early Jurassic. Petrogeochemical results show that the fine-grained monzogranite samples, medium-grained monzogranite samples and coarse-grained monzogranite samples are rich in silicon, poor in aluminum, high in alkali, low in calcium, enriched in Zr, Hf, Rb, K, depleted in Ba, Sr, Nb, P, Ti, swallow-type rare earth distribution model and other characteristics, the diagenetic type belongs to post-orogenic A2 granite. Combining the characteristics of chronology and geoch emistry, the authors believe that the Early Jurassic monzonitic granite in the study area was formed in the post-collision tectonic setting, representing an extension during the collision-assembly process of the Jiamusi and Songnen blocks, indicating the Early Jurassic the regional tectonic environment gradually changed from compression orogenic to post-orogenic extensional environment. |
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| Keywords: | Zhangguangcai Range Early Jurassic monzogranite zircon U-Pb dating geochemistry petrogenesis tectonic setting |
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