广西花山-姑婆山燕山期花岗岩的地球化学特征及成因研究
Geochemistry and petrogenesis of the Yanshanian Huashan-Guposhan granites in Guangxi
查看参考文献65篇
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文摘
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广西花山-姑婆山燕山期花岗岩体以高硅、高钾、富碱、低磷、准铝质为特征，具有较高的TFeO/MgO值，富集大离子亲石元素、高场强元素和稀土元素，普遍出现褐帘石，应归属于富钾的钙碱性花岗岩（KCG）系列岩石，相当于高钾钙碱性I型花岗岩。产生于后造山陆内挤压向拉张转换的地球动力学背景下，其形成与岩石圈伸展-减薄、亏损地幔岩浆的上涌和富含金云母-钾质碱镁闪石的岩石圈地幔的部分熔融有关。 |
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其他语种文摘
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The Yanshanian Huashan-Guposhan granites in Guangxi are characterized by high silicon, high potassium, high alkaline, low phosphor and metaluminous nature, with relatively high FeO^T/MgO ratios and enrichment of LILE, HFSE and REE. In addition, they commonly contain allanites. They can thus be assigned to the high-potassium calc-alkaline granite （or KCG in the classification system of Barbarin, 1999）. They were formed during the conversion of the tectonic setting from compression to extension. The extension-thinning of lithosphere, the upwelling of the depleted mantle, and the partial melting of the lithospheric mantle rich in phlogopite and K-richterite might have served as the principal factors in producing this kind of granitic rocks. |
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来源
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岩石矿物学杂志
,2006,25(2):97-109 【扩展库】
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关键词
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燕山期花山-姑婆山花岗岩体
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KCG
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含金云母-钾质碱镁闪石的岩石圈地幔
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后造山
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地址
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南京大学地球科学系, 内生金属矿床成矿机制研究国家重点实验室, 江苏, 南京, 210093
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-6524 |
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学科
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地质学 |
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基金
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国家973计划
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国家自然科学基金重点资助项目
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文献收藏号
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CSCD:2336836
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