论文部分内容阅读
江西弋阳存在与浙江陈蔡群相对应的两类斜长角闪岩 ,Ⅰ类为由拉斑玄武质岩石变质而成的正变质岩 ,Ⅱ类为由白云质泥灰岩经变质而成的副变质岩。通过对两地斜长角闪岩原岩的化学成分、微量元素、稀土元素、同位素及同位素年代学的对比研究 ,发现浙江陈蔡群的Ⅰ类斜长角闪岩原岩为大洋拉斑玄武岩 ,江西弋阳Ⅰ类斜长角闪岩原岩为岛弧拉斑玄武岩 ;显示两地Ⅰ类斜长角闪岩产出于不同的构造环境 ,并于晋宁期、加里东期、印支期共同受构造作用影响。
There are two types of amphibolite associated with Chencai Group in Zhejiang Province, Yiyang, Jiangxi Province. Type I is a positive metamorphic rock formed by the metamorphism of tholeiite basaltic rocks, and a type II is a metamorphic rock formed by metamorphism of dolomitic marl Metamorphic rocks. By comparing the chemical compositions, trace elements, rare earth elements, isotopes and isotopic chronologies of plagioclase amphiboles in the two places, it is found that the type Ⅰ amphibolite amphiboles of Chencai Group in Zhejiang Province are mainly composed of oceanic basalt, Jiangxi The original rocks of the Ⅰ type amphibolite in Yiyang are island arc tholeiitic basalts. It shows that the type Ⅰ amphibolites of the two places are produced in different tectonic settings and are commonly shared by Jinning Period, Caledonian Period and Indosinian Period Tectonic effects.