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黔东及邻区地质构造特征及其演化
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摘要
根据黔东及邻区地质构造特征,划分出了四个构造旋回期,即洋陆转换阶段的武陵构造旋回期和加里东构造旋回期,板内活动阶段的燕山构造旋回期和喜马拉雅构造旋回期。采用造山带构造分析的原理、方法,对其各构造旋回期的物质结构、几何结构特征进行了研究和分析。
     通过对该地区物质结构的研究,首次对该地区进行了大地构造相的划分,并且根据不同的造山性质,提出了洋陆转换造山性质和板内造山性质的大地构造相划分方案,使之能更清晰地反映出本区不同造山性质的构造演化历程。
     通过对该地区几何结构的研究,发育的典型构造样式有(开阔、紧闭型)阿尔卑斯式褶皱、韧性(过渡性)剪切带、变质核杂岩构造、侏罗山式褶皱、逆冲推覆构造、平行走滑构造、地垒—地堑式构造等。
     通过对区域地质资料的综合研究和分析,提出该地区演化是从洋陆转换阶段向板内活动阶段演化,从活动型地壳向稳定型地壳演化历程。根据不同构造旋回期沉积盆地的性质、位置的迁移,典型构造样式的发育及其平面变化,不整合界面的性质、平面变化、界面上伏与下覆地层的关系及其平面变化,变质特征及变化等,首次提出了该地区武陵运动的中心位置为贵州梵净山北、湖南大庸、岳阳、平江一线,加里东运动的中心位置为广西罗城—龙胜、湖南通道一线,燕山运动形成的造山带中心位置应在研究区东侧的绍兴——萍乡——北海一线,喜山构造旋回期进入板内隆升活动阶段。
     提出该地区大地构造单元新的划分方案,即以师宗—松桃—慈利—九江一带为界,其北西为扬子陆块,以绍兴—萍乡—北海断裂带为界,其南东为华夏陆块,其间则为江南造山带,它是位于扬子陆块(北西侧)和华夏陆块(南东侧)之间的一个同级别构造单元。江南造山带尚可进一步划分为三个亚带,即以师宗——松桃——慈利——九江一带为北亚带,以广西罗城——龙胜——湖南桃江——景德镇一带为中亚带,以绍兴—萍乡—北海断裂带为南亚带,其间夹黔东—湘西中间地块、南宁—长沙中间地块。首次提出了江南造山带西南段是一个由武陵期造山亚带(即北亚带)、加里东期造山亚带(即中亚带)和燕山期造山亚带(即南亚带)共同构成的复合造山带。
Based on the geological and tectonic features of the East Guizhou and its adjacent regions,four tectonic cycles were suggested in this area, namely,the Wuling Cycle,the Caledonan Cycle(transformation from ocean to continent), the Yanshanian Cycle and the Himalayan Cycle(developed in an intra-plate orogen).Employing associated tectonic analyses methods of orogenic belt, the material frame and geometrical features of these four tectonic Cycles were analyzed in detail.
     We tried to divide the tectonic facies the studied area into two different tectonic facies based on the studies of material textures and features of different orogen: orogen formed during transformation from ocean and continent and intra-plate orogenics. This classification may better illustrate the tectonic evolutions of different orogens in the East Guizhou and its adjacent regions.
     Based on the studies of geometrical features,Typical structural patterns were found in the East Guizhou and its adjacent region including the Alps-type fold(widen and closeness),the Jurassic type fold,thrust nappe,the ductile shear zone,orogen-paralleled sliding structures,the metamorphosed core-complex (MCC))structure,extensional detachment,and horst-graben structure.Meanwhile, the main structural traces in different tectonic cycles were unique.
     According to comprehensive analyses of the regional geological data,we presented a tectonic evolution history as follows:the Wuling to Caledonan Cycles (represented a transformation from ocean to continent),and the Yanshanian and Himalayan Cycles(intra-plate activation).By this process,the active crust evolved into a stable one.
     Our researches were focused on these following areas: nature of sedimentary basins formed in different tectonic cycles and their migration; characters of typical tectonic patterns and their areal distribution; properties of unconformity surfaces, their distribution and the relationship between their lower and upper strata. Based on the above sedimentology and structure geology studies, we firstly proposed that the center of Wuling Movement is located along North Fanjingshan(in Guizhou Province)-Dayong(in Hunan province)-Yueyang(in Hunan province)-Pingjiang(in Hunan province) while the center of Caledonian Movement is located along Luocheng(in Guangxi province)-Longsheng(in Guangxi province)-Tongdao(in Hunan province) and the center of Yanshanian orogen is located along Shaoxing-Pingxiang-Beihai. The tectonic movement in this area stepped into intraplate uplifting during Indo-Chinese periods.
     Accordingly,a new tectonic division schedule for the study area was proposed and described below.The first-level tectonic unit was the Jiangnan Orogen, which is bounded northerly by the Shizong-Songtao-Chili-Jiujiang belt and southerly by the Shaoxin-Pingxiang-Beihai fault system.The Jiangnan orogen is bracketed by the Yangtz (Northwest) and Cathisian (Southeast) blocks, and it was subdivided into three sub-units: the southern boundary of the northern sub-unit is the Shizong-Songtao-Chili-Jiujiang belt;between the Shizong-Songtao-Chili-Jiujiang belt and the Luocheng-Longshen-Taojiang-Jingdezhen was the middle sub-unit; and south of the Luocheng-Longshen-Taojiang-Jingdezhen belt belongs to the southern sub-unit , where the Qiandong-Xiangxi and Nanning-Changsha blocks were enclosed.In conclusion,the Jiangnan Orogen is a composite one formed by multi-stages orogenesis of the Wuling northern sub-orogen,the Caledonan middle sub-orogen,and the Yanshanian southern sub-orogen.
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