摘要
文章讨论了对流地幔向大陆的输入是大陆成矿作用的直接驱动力。以华北燕山造山带为例,认为卷入的对流地幔可能深达670km界面。对流地幔的热和物质输入大陆诱发形成一个新的被扰乱的岩石圈–软流圈系统(LAS),它成为大陆成矿作用的重要深部环境。提出了被扰乱的大陆岩石圈–软流圈系统及其成矿作用的4个类型:①伸展环境下的岩石圈巨大减薄作用;②挤压环境下的岩石圈巨大减薄作用;③挤压环境下的岩石圈巨大加厚作用;④太古克拉通岩石圈根在造陆运动中,地幔深部小的热扰乱。最后讨论了大陆成矿作用的基本过程。
This paper deals with the input of heat and materials from the convectional mantle into the continent as a direct driving force for the continental metallogensis. With the North China Yanshanian orogenic belt as an example, it is held that the involved convectional mantle might reach the depth of 670 km interface. A disturbed lithosphere/asthenosphere system is believed to be the major deep setting. Four types of disturbed lithosphere/asthenosphere systems are suggested: (1) large lithosphere thinning in an extensional setting, (2) large lithosphere thinning in a compressional setting, (3) large lithosphere thickening in a compressional setting, and (4) small thermal disturbance of the Archean cratonic lithosphere-root. The basic process of continental metallogensis is also discussed.
出处
《矿床地质》
CAS
CSCD
北大核心
2004年第S1期24-31,共8页
Mineral Deposits
基金
中国地质调查局(编号:K1.4-1-2&200113900018)
国家自然科学基金重点项目(编号:402344048)
国土资源部科技专项计划项目(编号:20001010202&200010103)
"中国三维岩石圈深部物质模型研究"课题
中国科技部IGCP国际合作项目(编号:2001cb711002)
中国地质大学"岩石圈构造
深部过程及探测技术"教育部重点实验室开放课题(编号:2003009&2003010)联合资助
关键词
对流地幔
岩石圈-软流圈系统
大陆成矿作用
convective mantle, lithosphere/asthenosphere system, continental metallogenesis
