滇西腾冲新岐花岗岩年代学、地球化学及其构造意义
Geochronology and Geochemistry of Granites in the Tengchong Xinqi Area, Western Yunnan and Their Tectonic Implication
查看参考文献35篇
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文摘
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为探明滇西腾冲地区含矿花岗岩特征、钨锡多金属矿的成矿与成岩关系,以及花岗岩在区域构造上的意义,对腾冲新岐地区古永岩体与新岐岩体开展了系统的地球化学研究。结果表明,两岩体均具有高硅、高钾、富碱、富铝、低钛等特征。其 CaO/Na_2O、Rb/Ba、Rb/Sr值反应其源岩为富黏土质砂岩,微量及稀土特征差异表明其具有不同的结晶演化过程。锆石U-Pb定年获得古永岩体的成岩年龄为62. 9±1. 9 Ma,新岐岩体的成岩年龄为61. 9±1. 4 Ma,表明二者应为同时或近乎同时侵入于该地区,在形成年代上无明显界限。在区域上,两岩体成岩年龄与冈底斯林子宗火成岩年龄60~ 64. 47 Ma相当,是冈底斯东南缘对印度板块与欧亚板块初始碰撞的响应。 |
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其他语种文摘
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In order to detect the features of ore-containing granites,the relationship between the Tungsten polymetallic ore mineralization and diagenesis,the regional tectonic significance of granite in the Tengchong region of west Yunnan,a systematical geochemical study on Guyong and Xinqi rock bodies in the Xinqi region of Tengchong was carried out. Results indicated that these two rock bodies have features of high-silicon,high potassium,rich alkaline,rich aluminum,and low titanium. The CaO/Na_2O,Rb /Ba and Rb /Sr values of these rock beds reflected that their sources were clay-rich sandstone; the difference between trace and rare-earth elements contents indicated that the rock beds had different crystalline evolution processes. The diagenesis ages of the Guyong rock body and the Xinqi rock body by Zircon U-Pb dating are 62. 9± 1. 9 Ma and 61. 9 ± 1. 4 Ma,respectively,indicating that they invaded this area simultaneously or almost simultaneously. On the regional perspective,the diagenesis ages of the two rock bodies are similar to that of the Gangdese Lingzizong igneous rock (60 to 64. 47 Ma),which represents the initial collision between the south-eastern edge of the Gangdese- Indian Plate and the Euro-Asian Plate. |
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来源
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矿物岩石地球化学通报
,2015,34(1):139-148 【核心库】
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DOI
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10.3969/j.issn.1007-2802.2015.01.016
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关键词
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腾冲新岐
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花岗岩
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地球化学特征
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锆石U-Pb
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地址
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳, 550002
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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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1007-2802 |
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学科
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地质学 |
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基金
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中国地质调查局委托项目
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文献收藏号
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CSCD:5350729
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