摘要
变质核杂岩是岩石圈伸展减薄的典型构造形式,也是研究岩石圈减薄机制的“窗口”。在大量前人研究的基础上,对华南中生代岩石圈减薄的时间与机制和华南变质核杂岩的研究现状进行了综述。变质核杂岩是华南中生代岩石圈伸展与减薄的重要产物,它在华南地区的广泛出现为讨论岩石圈伸展与减薄作用提供了重要约束。同位素地质年代统计表明,华南地区变质核杂岩主体形成与剥露的峰期介于140-120Ma的早白垩世,它们的出现与华南大规模岩石圈减薄、岩浆活动及大规模成矿作用的时间非常吻合。本文还介绍了一些关于变质核杂岩和岩石圈减薄机制研究的最新进展,这些研究进展表明,加强对变质核杂岩等伸展构造的研究,对研究岩石圈板块演化的时间、机制、运动学,进而建立更加完善的岩石圈演化模型具有重要意义。
The metamorphic core complex is a typical pattern of lithospheric extending and thinning. It is also a window through which we may reveal the thinning mechanism of a lithosphere. This paper will review the geochro-nology and mechanism of lithospheric thinning and the metamorphic core complexes, an important product of lithos-pheric processes (extending and thinning) during the Mesozoic in South China. The statistics of isotope geochronology of the metamorphic core complexes in South China indicates that the peak time of its formation and erosion is at 140-120Ma. This is well consistent with the time of lithospheric thinning, magma activity and mineralization. Some advanced studies on the topic suggest that it is of important significance to study the history, mechanism and kinematics of the lithospheric evolution for better understanding metamorphic core complexes.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2008年第1期11-19,共9页
Geotectonica et Metallogenia
基金
国家自然科学基金项目(40573017)资助
关键词
变质核杂岩
岩石圈减薄
中生代
华南
metamorphic core complexes
lithospheric thinning
Mesozoic era
South China