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利用电子探针和激光探针剥蚀系统 (LA ICP MS) ,对北羌塘半岛湖新第三纪粗面安山岩中的碱性长石和斜长石进行了系统分析 ,讨论了激光探针原位 (insitu)测试方法的有关细节及其对暗色矿物和浅色矿物的耦合性。在此基础上分析归纳了本区长石矿物中痕量元素及稀土元素地球化学性状。结果表明 ,长石中强烈地富集了Rb、Sr、Ba和Eu ,在两类长石中 ,无论是大离子亲石元素还是稀土元素 ,均未显示明显的选择性富集规律。
Alkaline feldspar and plagioclase in the Neogene Tertiary andesite of Peninsula Lake in North Qiangtang were systematically analyzed by using electron probe and laser probe denudation system (LA ICP MS). The effects of laser probe in situ details of the insitu test method and their coupling to dark and light minerals. On this basis, the geochemical characteristics of trace elements and rare earth elements in feldspar minerals are analyzed and summarized. The results show that Rb, Sr, Ba and Eu are strongly enriched in feldspar. In both types of feldspar, neither the large ion lithophile nor the rare earth elements show obvious selective enrichment.