| 东北准噶尔哈旦逊石炭纪弧岩浆及堆晶柱形成机制 |
| |
| 引用本文： | 司翠芹,刘伟,刘秀金.东北准噶尔哈旦逊石炭纪弧岩浆及堆晶柱形成机制[J].地球科学,2022,47(1):325-341. |
| |
| 作者姓名： | 司翠芹 刘伟 刘秀金 |
| |
| 作者单位： | 1.中国科学院矿产资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029 |
| |
| 基金项目： | 国家自然科学基金项目(Nos.41573030,41273019,92062104,41873059)。 |
| |
| 摘 要： | 为了阐明东北准噶尔弧岩浆形成机制和破译中地壳P波高速块体,对哈旦逊石炭纪侵入杂岩进行了锆石U-Pb年龄(324.8～323.1 Ma)和 δ18O及 εHf(t)、矿物化学、主微量元素和Nd-Sr同位素分析.其稀土元素分布模式上凹,从闪长岩(夹带角闪石岩堆晶)到二长花岗岩的主微量元素变异可以用两阶段分离结晶模拟.结果显...
|
| 关 键 词： | 角闪石岩堆晶 石炭纪埃达克岩 分离结晶 东准噶尔东北缘 洋内弧 南向俯冲 地球化学 |
| 收稿时间： | 2021-02-17 |
Generation Mechanism of Carboniferous Arc Magma and Cumulate Column in Middle Arc Crust,Hadanxun of Northeast Junggar |
| |
| Si Cuiqin,Liu Wei,Liu Xiujin.Generation Mechanism of Carboniferous Arc Magma and Cumulate Column in Middle Arc Crust,Hadanxun of Northeast Junggar[J].Earth Science-Journal of China University of Geosciences,2022,47(1):325-341. |
| |
| Authors: | Si Cuiqin Liu Wei Liu Xiujin |
| |
| Institution: | (Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone,Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China) |
| |
| Abstract: | Secondary-ion mass spectrometric U-Pb age(324.8-323.1 Ma)andδ18O and laser-ablation multi-collector ICP-MSεHf(t)of zircons,mineral chemistry and whole-rock geochemistry and Nd-Sr isotopes of the Carboniferous intrusive complex of Hadanxun were analyzed in this study in order to expound the mechanism of arc magma generation and decipher high P-wave velocity body in the middle crust of Northeast Junggar.Their rare earth element distribution patterns are concave-up.The major and trace element variations from diorite(with entrained hornblendite cumulate)to monzogranite,with decreasing Dy/Yb and primitive-mantle normalized NbN/TaN,can be reproduced with quantitative modeling of fractional crystallization of hornblendite(Stage 1)and feldspar-dominated minerals(Stage 2).They exhibit high Sr/Y,low Y and mean zirconδ18O of 6.42‰,suggesting derivation from subducting oceanic-slab.Al-in-hornblende barometer reveals that the hornblendite cumulate(population 1:26-22 km depth;population 2:20-18 km)constitutes high P-wave velocity body in the middle crust of Northeast Junggar.The Carboniferous intrusive complex of Hadanxun exhibits high positive zirconεHf(t)(weighted mean=12.99)and depletedεNd(t)(6.22-6.55)and(87Sr/86Sr)i(0.7037-0.7040),precluding oceanic crust and continental-crustal materials from Chinese Altay as source component.Thus,the Northeast Junggar was an intra-oceanic arc and the oceanic-plate subduction continued until the Carboniferous. |
| |
| Keywords: | hornblendite cumulate Carboniferous adakite fractional crystallization Northeast Junggar intra-oceanic arc southward subduction geochemistry |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《地球科学》浏览原始摘要信息 |
| 点击此处可从《地球科学》下载免费的PDF全文 |
|
