福建武平岩基岩石谱系单位划分  

Classification of Litholineage Units of Wuping Batholith in Fujian Province

作　　者：马金清[1] 冯宗帜 

机构地区：[1]福建省区域地质调查队,三明365001

出　　处：《福建地质》1998年第4期177-187,共11页Geology of Fujian

摘　　要：根据近几年来在1：5万区调中采用岩石谱系单位新理论、新方法填图的成果，以及岩石成分、结构构造特征、群居关系、侵人接触类型等，将过去1：20万区调均划属燕山早期黑云母花岗岩及细粒花岗岩的武平岩体，解体为志留纪、晚三叠世、侏罗纪、白垩纪等不同时代深成岩体，划分出中（基）性、中酸性及酸性岩等岩石类型。圈定深成岩体40个，独立侵人体15个，共33个单元，归并为6个超单元，5个独立单元。并认为志留纪侵人岩浆属改造型，三叠纪─侏罗纪侵入岩浆以同熔型为主，白垩纪侵入岩浆既有同熔型也有分异型。基本查明志留纪、中晚侏罗世岩体主要为挤压环境的主动就位，而晚三叠世─早株罗世早期白垩纪岩体则主要为拉张环境的被动就位，其定位环境与北西向及北东向断裂生成发展密切相关。Wuping batholith is locatd in the boundary of Fujian Province and Guangdong Province and in the famous Shanghang-Yunxian NW-trending and Zhenghe-Dapu NE-trending tectomagmative active belts. The batholith was only put under early Yanshanina biotite granite and fine granite in the 1: 200000 regional geological surveying. According to the results by the new theory and methods of litholineage unit mapping (1: 50000 scale) and to the composition, textures, structures, and intrusive contact of the rocks, the batholith can be divided into Silurian, Late Triassic, Jurassic and Cretaceous plutons and intermediate (basic ), intermediate-acid and acid rocky types. It is dismembered for 40 plutons, 15 independent intrusive bodies, and 33 units, and grouped under 5 superunits and 1 sequence and 5 independent units. It is considered that the magma of Silurian intrusive rocks is remelting type, the magma of Triassic-Jurassic intrusive rocks mainly a syntexis type and the magma of Cretaceous intrusive rocks syntexis and differentiated types. It is found out that Silurian-Jurassic masses are mainly in the initiative emplacement in a compressed environment, and the Late Cretaceous-Early Jurassic masses are in the passive emplacement in a tensile environment. The emplacement environments are a close relationship with the NE and NW-trending faults.

关 键 词：谱系单位 岩浆成因 就位机制 武平岩基 岩石 

分 类 号：P584[天文地球—岩石学] P588.11[天文地球—地质学]