| 扬子克拉通黄陵背斜南部～860 Ma岩墙的成因及地质意义 |
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| 引用本文： | 蒋幸福,彭松柏,韩庆森.扬子克拉通黄陵背斜南部～860 Ma岩墙的成因及地质意义[J].地球科学,2021,46(6):2117-2132. |
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| 作者姓名： | 蒋幸福 彭松柏 韩庆森 |
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| 作者单位： | 东华理工大学地球科学学院,核资源与环境国家重点实验室,江西南昌 330013;中国地质大学地球科学学院,湖北武汉 430074;中国地质大学地球科学学院,湖北武汉 430074;中国地质大学全球大地构造中心,湖北武汉430074;中国地质大学地球科学学院,湖北武汉 430074 |
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| 基金项目： | 东华理工大学核资源与环境国家重点实验室开放基金NRE1911国家自然科学基金项目41272242东华理工大学博士启动基金项目DHBK2015321 |
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| 摘 要： | 首次报道了扬子克拉通黄陵背斜南部由辉绿岩脉、花岗闪长岩脉和正长花岗岩脉组成的新元古代早期小型岩墙.辉绿岩脉和花岗闪长岩脉的锆石U-Pb定年结果分别为856±6.4 Ma和860±6.0 Ma.全岩主量和微量元素数据显示岩墙中辉绿岩具有高Pb含量，且Ba/Nb和La/Nb比值变化较大，而花岗闪长岩脉和正长花岗岩脉样品的Y和Nb含量较低，结合继承性锆石年龄分布特征，暗示岩墙形成过程中遭受了不同程度的年轻岛弧地壳物质混染.黄陵南部~860 Ma小型岩墙的发现，表明扬子克拉通在早于该时期已进入后碰撞的伸展构造环境.综合区域已有资料，认为扬子克拉通前寒武纪基底的裂解在时空上均表现出较大差异.
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| 关 键 词： | 扬子克拉通 黄陵背斜南部 860 Ma岩墙 新生地壳混染 伸展构造环境 岩石学 |
| 收稿时间： | 2020-05-28 |
Petrogenesis and Geological Significance of ca. 860 Ma Dikes in Southern Huangling Anticline,Yangtze Craton |
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| Jiang Xingfu,Peng Songbai,Han Qingsen.Petrogenesis and Geological Significance of ca. 860 Ma Dikes in Southern Huangling Anticline,Yangtze Craton[J].Earth Science-Journal of China University of Geosciences,2021,46(6):2117-2132. |
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| Authors: | Jiang Xingfu Peng Songbai Han Qingsen |
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| Abstract: | It reports the first occurrence of Early Neoproterozoic dike swarm located in the southern Huangling anticline, Yangtze craton, which is composed of diabase, granodiorite and syengranite. Zircon U-Pb dating of diabasic and granodioritic dikes yields weighted mean 206Pb/238U ages of 856±6.4 Ma and 860±6.0 Ma, respectively, which are interpreted as the formation ages of the dike swarm. Whole-rock geochemical results show that diabasic dikes show high contents of Pb, variable Ba/Nb and La/Nb ratios, however, the granodioritic and syengranitic dikes have relative low contents of Y and Nb. In combination with age spectrums of inherited zircons from analytical dikes, it is proposed that the dike swarm experienced a certain crustal contamination of juvenile island arc during formed process. Document of ca. 860 Ma dike swarm in the southern Huangling anticline indicates that the Yangtze craton entered into the post-collisional extensional environment before 860 Ma. Therefore, it is inferred that Precambrian basement breakup of the Yangtze craton shows difference in spatial-temporal distribution. |
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