| 小秦岭太古宙TTG质片麻岩的地球化学 |
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| 引用本文： | 李俊建,沈保丰.小秦岭太古宙TTG质片麻岩的地球化学[J].地质找矿论丛,1991,6(4):52-62. |
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| 作者姓名： | 李俊建 沈保丰 |
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| 作者单位： | 天津地质矿产研究所
(李俊建)，天津地质矿产研究所(沈保丰) |
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| 摘 要： |
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| 关 键 词： | 片麻岩 地球化学 TTG质 太古宙 |
GEOCHEMISTRY OF ARCHEAN TTG GNEISSES IN XIAOQINLING DISTRICT |
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| Li junjing and Shen Baofeng.GEOCHEMISTRY OF ARCHEAN TTG GNEISSES IN XIAOQINLING DISTRICT[J].Contributions to Geology and Mineral Resources Research,1991,6(4):52-62. |
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| Authors: | Li junjing and Shen Baofeng |
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| Institution: | Tianjin Institute of Geology and Mineral Resources;Tianjin Institute of Geology and Mineral Resources |
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| Abstract: | Xiaoqinling Archean granitoid-greenstone belts consists of greenstone belts and surrounding TTG gneisses(trondhjemitictonalitic-granodioritic gneisses). The TTG gneisses invades the greenstone belts. The dominant gneissic rock type is high Al2 O3(more than 15%)gneisses, which commonly comprises ca. 83% of the granitoid-greenstone belts. TTG gneisses is characterized by relatively high LIL elements(Sr, Ba), low contents Rb, Cr, Co, Ni, and low K/Rb ratio and Rb/Sr ratio. The REE patterns of TTG gneisses are relatively strongly fractionated, with LREE highly enriched and HREE remarkably depleted, positive Eu anomalies, non Eu anomalies or minor negative Eu anomalies. REE modelling indicates that TTG gneisses is formed by 10-30% partial melting amphibolite. |
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