| 铜陵中生代中酸性侵入岩特征及成因 |
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| 引用本文：吴才来,陈松永,史仁灯,郝美英.2003.铜陵中生代中酸性侵入岩特征及成因[J].地球学报,24(1):41-48. |
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| 基金项目:国家自然科学基金项目(批准号:49772106) |
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| 中文摘要:铜陵地区中酸性侵入岩可以划分为橄榄安粗岩系列和高钾钙碱性系列 ,橄榄安粗岩系列的岩石组合为辉石二长闪长岩 +二长闪长岩 +石英二长岩 ,这些岩石的里特曼指数大于 4(变化于 4.2～ 5 .8之间 ) ,岩石的稀土总量 ((REE)变化于2 11× 10 -6～ 2 6 4× 10 -6之间 ,且与金矿床关系较密切。高钾钙碱性系列侵入岩岩石组合为闪长岩 +石英二长闪长岩 +花岗闪长岩 ,岩石的里特曼指数小于 4(1.8～ 3 .2 ) ,ΣREE为 130× 10 -6～ 188× 10 -6,与铜矿床关系较为密切。结合包体岩石学研究得出 ,橄榄安粗岩系列岩浆为幔源碱性基性岩浆分异的产物 ,高钾钙碱性系列岩浆是分异的幔源岩浆和壳源酸性岩浆混合的产物。 |
| 中文关键词:高钾钙碱性系列 橄榄安粗岩系列 侵入岩 成因 铜陵 |
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| Origin and Features of the Mesozoic Intermediate-acid Intrusive in the Tongling Area, Anhui, China |
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| Abstract:The Mesozoic intermediate-acid intrusive rocks in Tongling area can be divided into two magmatic series, namely the shoshonitic series and the high-potassium (K) calc-alkaline series. The shoshonitic series is characterized by an association of pyroxene monzodiorites+monzodiorites+quartz monzonites, the Rittmann indices of these rocks are greater than 4 (ranging from 4.2 to 5.8), the total of rare earth elements (ΣREE) ranges from 210×10 -6 to 260×10 -6,and has good relationship with gold deposits. The high-potassium calc-alkaline series is by an association of diorite+quartz monzodiorites+granodiorites, the Rittmann indices are less than 4 (1.8～3.2),ΣREE 130×10 -6～180×10 -6,and has good relationship with copper deposits. Together lithoenclave study, it can be concluded that the shoshonitic series magma is derived from the differentiation of the alkaline basic magma in mantle and the high-potassium (K) calc-alkaline series magma is mixture between the differentiated mantle magma and crustal magma. |
| keywords:high-K calc-alkaline series shoshonitic series intrusive rock origin Tongling |
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