摘要
河北省围场-隆化一带中生代侵入岩分布广泛,其形成与板内造山作用关系密切。在区域地质调查和综合研究的基础上,把该区侵入岩划分为9个岩石谱系超单元。依据不同时代侵入岩的演化规律、就位机制、区域构造格局与演化序列以及地质建造与改造等,可将本区中生代燕山板内造山过程划分为两个侵入岩-造山旋回。第Ⅰ期侵入岩-造山旋回(晚三叠世早期-中侏罗世晚期)由A型侵入岩-伸展构造组合、Ⅰ型侵入岩-收缩构造组合和S型侵入岩-收缩构造组合组成,其相应的造山构造阶段早期呈拉张环境,中期和晚期为挤压;第Ⅱ期侵入岩-造山旋回(晚侏罗世早期-早白垩世晚期)由A型侵入岩-伸展构造组合组成,为断块式造山,形成了盆-山体系。
The Mesozoic intrusives are abroadly located in the Weichang-Longhua belt, Hebei Province, and have close relationship with Yanshan orogenic process. The authors divided the intrusives into 9 super rock units. Based on the their evolvement in different orogenic period, intruding process, regional structure, evolvement sequence, geological construction and alteration, it is suggested that the Mesozoic Yanshan orogenic process can be classified into 2 intruding-orogenic cycles. The first one is in the early period of late Triassic to late period of middle Jurassic, and developed the A-type intrusives with the extending structure assemblage, I-type intrusives with the contracting structure assemblage and S-type intrusion with thecontracting structure assemblage. Extension tectonic environment is mainly in the early period, and compression in the mid-late period. The second cycle is during early period of late Jurassic to late period of early Cretaceous. And it developed A-type intrusives with the extending structure assemblage, and belongs to fault-block orogenic movement, and formed basin-mountain system.
出处
《地质调查与研究》
2007年第1期1-12,共12页
Geological Survey and Research
基金
国家地质大调查项目:1:25隆化县幅(K50C003003)区域地质调查(项目编号20001300005101)
