摘要
云开地块区域混合岩是在低压变质作用基础上形成的。多数古成体原岩是富黑云母的过铝质片麻岩。混合岩野外特征、岩石学、矿物空间分布和地球化学综合研究均表明，该区浅色体是深熔成因的。单颗粒锆石定年结果表明，混合岩形成于加里东期，其时代为３９４ ～４４９Ｍａ，这期混合岩化作用可能与云开地块大规模的加里东期岩浆活动有关。
The regional migmatites were developed in the Yunkai Block on the basis of low pressure metamorphism. The majority of their protolithes are biotite rich peraluminous gneisses. Comprehensive studies of the field observations, petrology, mineral spatial distribution statistics and geochemistry have been carried out, and the results show that the leucosomes of the Yunkai migmatites were derived from anatexis. The single grain zircon U Pb dating data suggest that there was a migmatization during the Caledonia period, which may represent an important anatexis in the age duration of 394～449 Ma. The migmatization may be related to the large scaled Caledonian magmatism in the Yunkai Block.
出处
《地球化学》
CAS
CSCD
北大核心
1999年第3期231-238,共8页
Geochimica
基金
广东省自然科学基金!(编号:950680
930899)
