摘要
为加深闽西推覆构造带形成过程及其动力学机制的认识,采用构造解析与区域背景分析相结合的方法,对位于闽西推覆构造带前锋处小溪洋煤田构造的几何学、运动学特征及其构造演化的动力学机制进行分析.结果表明:井田内存在滑脱和推覆2种性质的构造;井田构造整体几何形态呈"仑"字型,其中"人"字代表多次逆冲推覆的叠瓦状构造,"匕"指井田的倒转向斜构造和其内部沿轴面的滑脱断层;早三叠世与中侏罗世华夏、库拉板块先后分别向西侧的扬子和华夏陆块下俯冲,引起武夷山脉隆起,导致井田在来自北西的2期继承性的挤压应力作用下,于印支期先后产生重力和挤压顺层滑脱构造,形成倒转复向斜褶皱,并最终于早燕山期形成"仑"型背骑式逆冲推覆构造;燕山晚期和喜山期在区域拉张环境下井田遭受剥蚀改造,并使部分构造产生反转.
In order to understand the evolutionary history and dynamic mechanism of thrusting nappe structural zone of western Fujian province, the characteristics of geometry and kinematics and dy structural structural namic analysi zone. structure and thr mechanism of structure in Xiaoxiyang coalfield were studied by combining s with background analysis, which locates the front part of thrusting nappe The results show that there are two basic structural types of decollement usting nappe structure. The whole profile of coalfield is in the form of ＂＇f~＂ pattern, where the ＂Jr＂ represents the imbricate arrangement of multi-period thrusting nappes and the ＂ K＂ the reversed syncline and its decollement fault along with axial plane. At early tri- assic and middle Jurassic, Cathysia and Kula plates respectively underthrust beneath the Yan- gtze block and Cathysia block, which results in the regional compression and the uplift of Wuy- ishan mountain. By the pressure and gravity from northwestern, the bedding decollement structure and the formation of reversed syncline successively developed at the Indosinian epoch,and the thrusting nappe structure ultimately generated in the coalfield at early Yanshanian epoch. In late Yanshanian and Himalayan epoch, the well field suffered from the reformation and erosion and parts of structure were inversed under the regional tension environment.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2008年第6期839-847,共9页
Journal of China University of Mining & Technology
基金
国家重点基础研究发展计划(973)项目(2003CB214600)
国家重点科技攻关项目(2004BA616A-06-01)
关键词
推覆构造
演化
动力学机制
小溪洋井田
thrust-nappe structure
evolvement
dynamics mechanism
Xiaoxiyang coalfield
