姚安和马厂箐富碱侵入岩体的地球化学特征
Geochemical characteristics of the Yao''''an and Machangqing alkaline-rich intrusions
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摘要: 姚安岩体和马厂箐岩体属哀牢山-金沙江富碱侵入岩带的组成部分，位于NW—WNW向哀牢山-金沙江深大断裂东侧。姚安岩体主要为正长斑岩，马厂箐岩体主要为花岗斑岩。两岩体化学成分上具有富碱、高钾的特点。岩石富轻稀土和Rb、Sr、Ba、Th、La等大离子亲石元素而亏损Nb、Ta和Ti等高场强元素。岩石的Rb／Sr、La／Nb和Ba／Nb以及LREE／HREE比值高，铕异常不明显，ISr值偏高，εNd值偏低。研究表明：(1)姚安岩体和马厂箐岩体形成于喜山期大陆弧伸展环境。两岩体的岩浆均起源于富集地幔(EMII)，其壳幔混合特征，主要是俯冲带地慢楔内壳．幔物质源区混合的结果；(2)尽管姚安和马厂箐岩体在成岩构造背景、成岩时代、成岩方式和源区特征以及成分上高碱富钾等方面具相似性，但它们在岩性和组成上仍存在较大差异。这种差异可能是由源区物质部分熔融程度不同，以及岩浆结晶时温压和氧逸度等条件的不同所造成；(3)金矿化主要与相对高温、低压和高氧逸度的碱性系列岩浆活动有关，而铜矿化则主要与相对低温、高压和低氧逸度的碱性-亚碱性过度系列岩浆活动有关。
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