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哀牢山-金沙江碱性岩带南段云南金平八一村钾质碱性花岗岩锆石SHRIMP U-Pb年龄 总被引:7,自引:4,他引:7
云南省金平县八一村钾质碱性花岗岩中的锆石由岩浆锆石和岩浆复合型锆石(老核新壳锆石)组成,以后者居多。锆石定年结果表明,岩浆锆石和岩浆复合型锆石的新壳SHRIMP U-Pb年龄为37Ma,反映岩浆上侵定位时的结晶时间,相当于始新世晚期。锆石老核获得的最大年龄为510Ma和177Ma,相当于晚寒武世和中侏罗世,表明该岩体保存有寒武纪和侏罗纪地质事件信息,而42~48Ma年龄可能是混合年龄。最后对锆石的成因和花岗岩的成岩机制等进行了初步探讨。 相似文献
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REE geochemistry of some alkali-rich intrusive rocks in China 总被引:3,自引:0,他引:3
Based on the REE analyses of about 300 samples from 40 alkali-rich intrusive rocks, a systematic study on the features of
REE composition was made, and the major factors controlling the REE distribution are discussed. According to REE, trace elements
composition and Sr, Nd isotopic characteristics, the source materials and petrogenetic process of the alkali-rich intrusive
rocks were studied. The petrogenetic models of Zijinshan, Sairna, Nianzishan and Shanhaiguan alkali-rich intrusive rocks were
calculated using multisequence fractional crystallization and assimilation fractional crystallization models.
Project supported by the President Foundation of Chinese Academy of Sciences. 相似文献
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