一个超越地台阶段的地洼──钦州地区大地构造演化特征

来源期刊：中南大学学报(自然科学版)1994年第3期

论文作者：李玉平 陈世益 彭柏兴

文章页码：282 - 287

关键词：大地构造演化; 地洼学说; 残余地槽

Key words：geotectnic evolntion; Diwa theory; remainder geosyncline

摘    要：从沉积建造、岩浆建造、构造型相和地质发展史角度,论述了钦州地区的大地构造特征.该区在早古生代隶属华南地槽区,加里东运动后,在华南其它地区已进入地台区情况下,仍然为地槽.东吴运动期间,该地槽封闭,并随即开始了地槽阶段晚期——褶皱带期,为一个残留地槽.印支运动后,又同华南其它地区一起,演化到地洼区阶段,成了东南地洼区的一部分.由此可见,钦州地区是一个超越了地台阶段的地洼.它与其它经由地台阶段的地洼相比,具有如下特征：(1)残留地槽具有继承性特征,仅出现于其负地槽部位;(2)它的出现受控于长期活动的深断裂;(3)在残余地槽间的活动性稍差,而在地洼阶段早期的活动性较强.

Abstract: Based upon the sedimentary,magniatism formation and types of structural deforma-tions,this paper has discussed the geotectnic evolutioriary characteristics of Qinzhou district,which belonged to southern China geosyncline region in the early Palaeozoic Era and was stillgeosyncline region after Caledonian orogeny movement when the other district of southernChina had changed into platform region. This remainder geosyncline began to close and evo-lute into the later phase of geosyncline一fold phase in the Dongwu movement.It has evolutedinto Diwa region with the other dlstrict of southern China since the Indosinian movement andbelongs to the Southeastern Diwa region. In brief,Qinzhou district is a Diwa region which hassurpassed the platform and it has some distinct characteristics compared with other districtevoluting into Diwa stage from the platform stage. First,the remainder geosyncline has inher-ited nature and it only occured in the negative tectnic of geosyncline unit;secondly,it wascontrolled by deep faults activating long time,and thirdly,its activity was weaker in the re-mainder geosyncline and is stronger at the begining of Diwa stage.