摘要
根据冷却年龄理论和大别造山带变质岩K-Ar表面年龄的平面分布,指出这些年龄既不代表岩石形成事件,也不简单地反映后期热事件,而代表岩石经剥蚀隆起温度下降到该矿物封度温度以来的时间,即反映地区的构造隆起历史。现有资料说明大别造山带整体在印支期开始隆起,但中部罗田—英山一带则隆起较快或地热增温率高,因而表现出年轻(燕山期)的表面年龄。
Based on the theory of cooling age and distribution of K-Ar apparent ages ofmetamorphic rocks from the Dabie orogen,it is indicated that these apparent agesrepresent neither the time when the rocks were formed, nor simple thermal dis-turbance, but the time since the temperature of the rock fell to below the closuretemperature of dated minerals because of erosion and/or uplifting, i. e. the historyof tectonic uplifting of the block. Data available indicate that the uplifting of theDabie orogen started in the Indosinian period, but the central part of the orogen,i. e. the Luotian-Yinshan area, shows young (Yanshanian) apparent ages due tofast uplifting and/or high geothermal gradient.
出处
《地质论评》
CAS
CSCD
北大核心
1993年第1期17-22,共6页
Geological Review
基金
国家自然科学基金(49070160)
关键词
钾
氢
年龄
造山带
地块
地壳
K--Ar apparent ages
the history of crust uplifting
the Dabie orogen
