| 铜陵矿集区燕山期中酸性侵入岩地球化学特征及其地质意义 |
| |
| 关键词:intrusive rocks shoshonite series high-K calc-alkaline series tectonic setting Tongling |
| 基金项目:中国科学院地质与地球物理研究所矿产资源研究重点实验室资助; 国土资源部专项研究计划项目(编号:20010103) |
|
| 摘要点击次数: 9167 |
| 全文下载次数: 7064 |
| 摘要: |
| Geochemical Characteristics of the Yanshanian Intermediate-acid Intrusive Rocks in the Tongling Mineralization Concentration Area, Anhui Province, and Their Geological Implications |
| The intermediate-acid intrusive rocks in the Tongling mineralization concentration area can be divided into two series without magmatic differentiation relationship, i.e., shoshonite series (SiO_2<56%) and high-K calc-alkaline series (SiO_2>56%). Geochemical characteristics of the two series are obviously different from each other. The characteristics of the rare earth elements, trace elements, and oxygen, lead, strontium and neodymium isotopes of the two series were studied in detail. On such a basis, it is held that the original magma of the high-K calc-alkaline series was mainly the partial melting material of old metamorphic basement rocks. It was mixed with basaltic magma of the mantle, followed by the emplacement before the emplacement of other rocks. The primal magma of the shoshonite series was alkaline basalt which originated from the enriched mantle and then underwent assimilation, fractionation and crystallization. Delamination of the lower crust or the lithospheric mantle followed by upward migration of the thermal mantle was caused directly by the intrusive rocks. The intrusive magmatic activities were indicators of the tectonic setting which changed from compression to extension. |
| LI Jin-wen,PEI Rong-fu,ZHANG De-quan,MEI Yan-xiong,ZANG Wen-shuan,MENG Gui-xiang,ZENG Pu-sheng,LI Tie-jun,DI Yong-jun.2007.Geochemical Characteristics of the Yanshanian Intermediate-acid Intrusive Rocks in the Tongling Mineralization Concentration Area, Anhui Province, and Their Geological Implications[J].Acta Geoscientica Sinica,28(1):11-22. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|