| 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,(4):52-62 |
| 小秦岭太古宙TTG质片麻岩的地球化学 |
| GEOCHEMISTRY OF ARCHEAN TTG GNEISSES IN XIAOQINLING DISTRICT |
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| DOI：10.6053/j.issn.1001-1412.1991.4. 005 |
| 中文关键词: TTG质片麻岩 地球化学 部分熔融 |
| 英文关键词: |
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| 中文摘要: |
| 小秦岭太古宙花岗岩—绿岩带由TTG质和分布其中的绿岩带所构成。TTG质片麻岩以底辟方式侵入绿岩带,以高铝型(Al2O3>15%)为主,大约占花岗岩—绿岩带组成的83%。TTG质片麻岩富Sr、Ba等LIL元素,贫Rb、Cr、Co、Ni,较低K/Rb和Rb/Sr为特征。具较强烈分馏的稀士元素分配模型,LREE强烈富集和HREE显著亏损,正Eu异常,无Eu异常或弱负Eu异常。REE模拟计算表明,TTG质片麻岩是斜长角闪岩经10～30%部分熔融形成的。 |
| 英文摘要: |
| 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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