PRELIMINARY STUDY ON THE DEEP GEOLOGICAL STRUCTURE IN THE XUEFENG AREA(THE JIANGKOU—DONGKOU SECTION)
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摘要: 据雪峰地区陆壳地质反射测深结果,结合作者野外地质工作的认识,并参考MT地电断面结构,建立重力模型和进行人机交互对话联合解释,初步编制区内深部地壳构造的几何形态和介质分布状态的有关图件,据此得出:(1)区内存在元古代"漂移"微陆块(海山？)和古生代碰撞造陆作用下产生的构造岩浆(变质)岩脉群及中新生代陆内俯冲伴生壳下塑性(碎裂)地幔岩(块);(2)区内古生代"软敛合"和中新生代"陆壳的榨挤"两种不同动力体制下的形变共存;(3)深部-浅部系列冲断构造块体和不对称扇形构造形变体是组成区内"华南造山带"中一个重要的构造单元。Abstract: In accordance with the data of deep seismic sounding,MT sectional structure,gravitymodel of the continental crust in the Xuefeng Area,as well as the interactive comprehen-sive interpretation and understanding of the field observations in the area,a series of mapsconcerning about the geometry of deep crustal structures and median rocks are preliminari-ly compiled in this paper.It is concluded as:(1)The Proterozoic underplating"drifted"micro-continental blocks(or sea mounts),and tectonomagmatic(metamorphic)dikeswarms formed under Palaeozoic collision and epeirogeny,and ductile(or brittle)pyroliticmasses accompanied with the Meso-Cenozoic intracontinental subduction must be occurredin the area.(2)Both the Paleozoic"mildly sutured"structure and the Meso-Cenozoic"in-tra-crustal squeeze"which were dominated by two different dynamic systems must havetaken place.(3)A group of deep-shallow thrusting sheets and asymmetric deformationfan-tectosomes is a key tectonic(division)domain in S.China orogenic zone.
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