摘要
海房沟组火山岩是辽西中生代火山岩的重要成员,其岩石共生组合为粗安岩-安山岩-英安岩-粗面英安岩,属于高钾钙碱性-钙碱性火山岩系。火山岩主量元素、稀土元素和微量元素研究表明:海房沟组火山岩属埃达克质岩;这些火山岩的源岩较深,可能为古老的下地壳玄武质岩石部分熔融产物。海房沟组埃达克质岩的确认对探讨辽西地区火山岩浆起源、壳幔相互作用、中生代构造应力场的重大转换及大规模断陷盆地群的形成具有重要意义。
In West Liaoning of northeast China, the Middle Jurassic volcanic rocks of Haifanggou Formation are important members of the Mesozoic rocks, which consist of trachyandesiteandesitedacitetrachydacite. The volcanic rocks belong to highK calcalkaline and calcalkaline series. By studing the major elements in volcanic rocks, rare earth elements and trace elements, the authors found that the volcanic rocks of Haifanggou Formation have similar petrography and geochemical characteristics to adakite. They are recognized as adakitelike rocks. The volcanic rocks were derived from the partial melting of ancient basaltic rocks in the lower crust, and the depth of volcanic sourcerocks is very large. The identification of adakitelike rocks in Haifanggou Formation have an important geological significance in discussing magma derivation, crustmantle process, the obvious transformation of Mesozoic tectonic stress field and formation of a plentiful of fault basins in West Liaoning, northeast China.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第5期457-461,共5页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
辽河石油勘探局基础研究项目(LYK19930622-01)
关键词
埃达克质岩
下地壳
海房沟组
中侏罗统
辽西
adakite-like rocks
the lower crust
Haifanggou Formation
Middle Jurassic
West Liaoning
