| 内蒙古解放营子花岗闪长岩岩浆混合机制——来自斜长石和角闪石的矿物化学证据 |
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| 引用本文： | 吕前露,刘建峰,赵硕,郭春丽,车亚文.内蒙古解放营子花岗闪长岩岩浆混合机制——来自斜长石和角闪石的矿物化学证据[J].岩石矿物学杂志,2022,41(2):322-338. |
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| 作者姓名： | 吕前露 刘建峰 赵硕 郭春丽 车亚文 |
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| 作者单位： | 1. 中国地质科学院地质研究所;2. 中国地质大学(北京);3. 中国地质科学院矿产资源研究所 |
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| 基金项目： | 国家重点研发计划项目(2017YFC0601301)；;国家自然科学基金项目(41472055)；;中国地质调查局项目(DD20190004,DD20160201-01)~~； |
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| 摘 要： | 为揭示华北克拉通北缘中晚三叠世解放营子花岗闪长岩的岩浆混合机制,对寄主岩石和镁铁质包体中斜长石和角闪石开展了电子探针分析.分析结果显示,多斑和少斑包体边部的斜长石斑晶发育An值增加的突变环带,环带的An值为32～46,明显高于核部和边部斜长石的An值(18～31),而核部的An值与寄主岩石中斜长石的An值一致,该特征指...
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| 关 键 词： | 解放营子岩体 矿物化学 岩浆混合 暗色包体 |
| 收稿时间： | 2021/8/24 0:00:00 |
| 修稿时间： | 2022/1/11 0:00:00 |
Magma mixing mechanism of the Jiefangyingzi granodiorite in Inner Mongolia:Evidence from mineral chemistry of plagioclase and hornblende |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;China University of Geosciences, Beijing 100083, China;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | In order to reveal the magma mixing mechanism of the Mid-late Triassic Jiefangyingzi Pluton on the northern margin of the North China Craton, this paper carried out electron microprobe analyses of plagioclase and hornblende in host rock and mafic enclaves. The results show that the plagioclase phenocrysts in rich-phenocrysts enclaves and the edges of poor-phenocrysts enclaves develop the spike zone of increased An value. The spike zone of An value (32~46) is higher than those of the core and rim in same plagioclase grain, and the An value of the core is consistent with that of plagioclase in host rock, indicating the spike zone was the result of the mafic magma capturing and modifying the plagioclase from host rock. The core of plagioclase at the central part of poor-phenocrysts enclaves has an erosion sieve structure, and the An value of the residual part (40~47) is higher than that of the erosion part (32~36) in the core of the plagioclase grain, but generally higher than that of rim in the phenocryst and fine-grained plagioclase in the matrix (17~35), indicating the central part of the enclaves has been modified by felsic composition. On the other hand, the TiO2 content of hornblende phenocrysts in host rocks (0.50%~1.10%) is significantly lower than that of hornblende in enclaves (1.17%~2.47%), while the TiO2 content of fine-grained hornblende in the matrix (1.58%~2.26%) is similar to that of hornblende in enclave, indicating that there was a mixture of mafic components at the late stage of host rocks evolution. The above studies show that magma mingling on a macroscopic scale and the migration of minerals and elements of magma mixing on a microscopic scale occurred between mafic and felsic magma during the formation of Jiefangyingzi Pluton. |
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| Keywords: | Jiefangyingzi Pluton mineral chemistry magma mixing mafic enclaves |
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