| 詹华明,罗照华,柯珊.一种岩浆混合作用的分类及其地质意义:以西昆仑山的3个岩体为例[J].地质找矿论丛,2010,25(4):271-281 |
| 一种岩浆混合作用的分类及其地质意义:以西昆仑山的3个岩体为例 |
| CLASSIFICATION OF MAGMA MIXING AND ITS GEOLOGICAL SIGNIFICANCE:IN CASE OF THREE PLUTONS IN THE WEST KUNLUN AREA |
| 投稿时间：2010-05-12 |
| DOI：10.6053/j.issn.1001-1412.2010.4. 001 |
| 中文关键词: 分类 混合作用 混杂作用 注入作用 |
| 英文关键词:classification hybridization minglization injection |
| 基金项目:国家重点基础发展计划“973”项目(G1998040807,2002CB412603);国家自然科学基金项目(40472038,40472033)联合资助 |
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| 中文摘要: |
| 文章以西昆仑山3个花岗质深成侵入体的研究为例,认为岩浆混合形成的深成岩特征取决于发生混合作用(hybridization)的岩浆的性质,如温度、黏度、成分等物理与化学条件。岩浆的大多数性质都与温度有关,因此可以以温度为主要指标将岩浆混合作用划分为混合、混杂和注入3种类型,分别对应于高、中、低温度条件。库地北岩体具有均一的外貌特征,岩石学和地球化学特征显示其产生具有幔源与壳源岩浆的贡献,是高温岩浆混合作用(mixing)的产物;胜利桥岩体含有大量镁铁质微粒包体,注入的基性岩浆团与其寄主岩浆作用不完全,是中温岩浆混杂作用(mingling)的典型代表,也是造山带出露最广的岩浆混合成因深成岩类;赛图拉岩体形成"双峰式"岩石组合,同时侵位的镁铁质岩浆和长英质岩浆之间基本上不发生物质交换,是两种低温岩浆相互注入的结果。由于岩浆混合作用是壳幔物质与能量交换的集中体现,混合作用的类型体现了区域地热梯度及其地质过程的强度。因此,区分不同的岩浆混合作用类型对了解岩浆混合作用过程、大地构造背景和壳幔相互作用具有重要意义。 |
| 英文摘要: |
| Based on researches on three plutons in the west Kunlun area characteristics of the plutons depend upon properties of the hybridized magma, such as temperature, viscosity and composition. Most of the properties are related to temperature of magma and this paper uses temperature as a main index to classify magma mixing into hybridization,minglization and injection types corresponding to high, medium and low temperature conditions. The northern Kuda pluton is homogeneous in appearance and its petrology and geochemistry are characterized by contribution of mantle and crustal magma sources and high temperature magma mixing. In Shengliqiao pluton there are a lot of micro-granular enclaves and basic magma injected is not reacted completely with the host rock. It is a typical mingled pluton with the most widely distributed outcrops. Saitula pluton is characterized by bimodel rock assemblage and mafic magma and felsic magma emplaced at the same time but no reaction and composition exchange take place thus it is the result of inter-injection of the two magma at low temperature. Magma mixing is the manifestation of material and energy exchange between mantle and crust and intensity of geothermal gradient and geological process is manifested by mixing type. Therefore, recognition of the magma mixing type is significant to understand the mixing process,geotetonic background and mantle-crust interaction. |
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