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本文描述了内华达州东北部六个二云母花岗岩的野外地质背景,并列出了分析数据。高的δ(18)~O和(87)~Sr/(80)~Sr值表明这些岩石均是由大陆壳形成的S型花岗岩。这些岩石的主要元素化学成分和副矿物含量也具有S型花岗岩的特征。文中列出了这些花岗岩中云母的化学成分、X光分结果和其它方面的资料。白云母明显高Fe_2O_3、FeO和MgO。除了一个水黑云母外,其它黑云母的MgO含量均接近6.0wt%。在本研究区内可分出两种不同类型的二云母花岗岩:一种类型是以白
This article describes the field geological background of six di-mica granites in northeastern Nevada and presents analytical data. High values of δ (18) ~ O and (87) ~ Sr / (80) ~ Sr indicate that these rocks are all S-type granites formed by continental crust. The major elemental chemical composition and accessory mineral content of these rocks also have the characteristics of S-type granites. The paper lists the chemical composition of mica in these granites, X-ray results and other aspects of the data. Muscovites obviously high Fe 2 O 3, FeO and MgO. Except for one water biotite, the other biotite MgO content is close to 6.0wt%. Two different types of mica micas can be distinguished in the study area: one is white