摘要
由基底片麻岩（内核）、剥离断层（接合面）及滑覆层状岩系（外壳）构成的佛坪穹隆构造，从其岩石组成、早期的运动学特征、变质变形改造和同位素测年资料综合分析，表明佛坪穹隆可能形成于印支期的主造山期前，并受印支期主造山期褶皱变形和燕山期逆冲、走滑作用的叠加改造。它经历了中元古代—前印支期隆－滑构造形成阶段，而与造山后期变质核杂岩明显不同，在造山带构造演化中具有重要意义。隆－滑构造发生的深部背景是造山带岩石圈垂向加积增生作用。该穹隆突出而重要地参与了秦岭造山带的形成与演化，具有重要的大陆动力学意义。
Foping dome in the Qinling orogenic belt consists of basement gneiss(core), detachment fault(contact plane) and sliding sedimentary seguence(cover). It is revealed, through synthetic analysis, on rock assemblages, early kinematics, characteristics of metamorphism and deformation, and geochronological data, that the Foping dome was formed before, transformed by Hercynian and Indosinian orogenic folding, and Yanshanian thrusting and strike sliping. Foping dome, different from metamorphic core complex, underwent uplift bedding delamination structural evolution from Mesoproterozoic to Caledonian. This process is important for the development of the Qinling orogenic belt. Therefore, it suggests vertical accretion of lithosphere in deep crustal setting of orogenic belts and shows its importance in continental dynamics.
出处
《长春科技大学学报》
CSCD
1998年第1期23-29,共7页
Journal of Changchun University of Science and Technology
关键词
佛坪地区
隆滑构造
秦岭
造山带
断层
滑覆层
Foping area, uplift bedding delamination structures, pre orogenic, the Qinling orogenic belt
