摘要
对岩浆与伸展作用的关系、伸展作用中岩浆的成因和需加强的工作进行了讨论，并重点论述了变质核杂岩形成机制与侵入作用的关系。在造山带重力势能差和深部作用等各种因素导致的拉伸应力场作用下，岩石圈地幔和地壳通过减压或深部热活动发生部分熔融而形成岩浆，岩浆的上涌强化了地壳伸展，对地壳的弱化作用触发伸展构造的发生。岩浆作用是变质核杂岩形成的主导因素之一，其主要包括对地壳的加热、弱化导致拆离断层的形成及由其浮力和密度产生不均一隆升而形成穹隆。
The relationship between magmatism and extension,the genesis of magmatic rocks during extension,and the further studies needed in this field are discussed in this paper.The relationship between the magmatism and the formation of metamorphic core complex is mainly expounded with emphasis.The magma is the result of the partial melting of lithosphere mantle and crust caused by decompression and thermal activities in depth under extending stress field which is deduced by several causes such as gravity energy and deep process of the orogenic belt.The upwelling of the magma intensifies the extension of the crust,weakens the crust and triggers the occurrence of extensional structures.The magmatism plays a dominant role in the formation of metamorphic core complexes.The magmatism heats and weakens the crust,and results in the detachment faulting.The buoyancy and density of the magma lead to the differential uplift of the crust,which forms the metamorphic core complex.
出处
《地质科技情报》
CAS
CSCD
北大核心
1998年第1期19-25,共7页
Geological Science and Technology Information
基金
国家自然科学基金
博士后基金
