| 杜玉雕,吕鹏瑞,张东阳.西天山查汗萨拉岩体的地球化学特征及岩石成因[J].地质找矿论丛,2011,26(2):131-142 |
| 西天山查汗萨拉岩体的地球化学特征及岩石成因 |
| The geochemical characteristics and petrogenesis of the Chahansala intrusion in western Tianshan area |
| 投稿时间：2010-12-04 |
| DOI：10.6053/j.issn.1001-1412.2011.2. 002 |
| 中文关键词: 岩石成因 演化 地幔 查汗萨拉岩体 西天山 |
| 英文关键词:petrogenesis evolution mantle Chahansala intrusion western Tianshan |
| 基金项目:国家科技支撑计划重点项目(2006BAB07B01)资助 |
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| 中文摘要: |
| 查汗萨拉岩体位于西天山地区博罗科努山北坡查汗萨拉一带,处于伊连哈比尔尕金成矿带内,与金矿化关系较为密切,主要由闪长岩和辉长岩组成。研究表明:岩石属于准铝质钙碱性系列,总体上MgO,CaO,TFeO和TiO2随着SiO2的增高而有轻微的降低,Na2O,K2O,Al2O3和P2O5与SiO2没有明显的相关性;在微量元素配分中显示Th,Nb,Ta和Zr相对亏损,而U,Ba和Pb富集,显示负的Nb异常和高的正Pb异常;REE总量偏低,属轻稀土元素富集、重稀土元素亏损型,轻、重稀土元素分馏不明显,具有微弱的负铕异常。一部分角闪石是在岩浆上升过程中结晶的,另一部分可能是岩浆定位以后结晶的;岩体形成温度介于650~760℃之间。成岩物质来源于地壳物质,并且有大量地幔物质加入。海西中晚期大量地幔物质侵入到深部地壳环境,形成壳幔混合型岩浆;由于构造活动强烈,形成区域性深大断裂带,混合型岩浆沿着深大断裂从大约20 km深处快速上侵到深度约为6 km处并经过平衡部分熔融作用结晶成岩,形成深成侵入岩。 |
| 英文摘要: |
| The Chahansala intrusion at Chahansala in northern slope of Boluokenu Mountain of western Tianshan area lies in the Yilianhabierga gold metallogenic belt.It is mainly composed of gabbro and diorite associated with gold mineralization and characterized by metaluminous calc-alkaline rock series,slight decrease of MgO,CaO,TFeO and TiO2 with the increase of SiO2,no apparent correlations of Na2O,K2O,P2O5 and Al2O3 with SiO2,relative depletion of Th,Nb,Ta and Zr and U,Ba and Pb enrichment,significant Nb negative anomaly and high Pb positive anomaly,relative low∑REE,LREE enrichment and HREE depletion,weak Eu negative anomaly,and no apparent LREE and HREE fractionation.Some amphiboles crystallized during moving up of magma,the others may be crystallized after the magma positioning.The forming temperature of intrusion is in the range of 650-760℃.The rock-forming materials are derived from crustal materials incorporated with voluminous mantle materials.In the middle and late Hercynian period voluminous mantle materials intruded into the deep crustal environment leading to formation of the mixed crust-mantle magma and the regional deep faults are formed because of the strong tectonic activity.The magma fastly up-invaded from about 20km to about 6 km along the faults and crystallized to form the deep intrusion after balanced partial melting. |
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