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面积平衡法与川东大池干推覆带区域滑脱面预测
引用本文:刘玉萍,张洁,尹宏伟,徐士进.面积平衡法与川东大池干推覆带区域滑脱面预测[J].大地构造与成矿学,2008,32(4).
作者姓名:刘玉萍  张洁  尹宏伟  徐士进
作者单位:南京大学地球科学系及成矿作用国家重点实验室,江苏,南京,210093
基金项目:国家自然科学基金项目(  
摘    要:本文详细介绍了面积平衡法的原理与方法,并将该方法应用于川东大池干构造的解释。利用面积平衡法,本文预测出在该地区可能有三个较大的区域滑脱面,它们分别位于3.53km处的中三叠统(由石膏、盐岩和泥页岩组成),7.79km处的下寒武统(由页岩、石膏和岩盐层组成),以及8.67km处的下寒武统(由页岩、石膏和岩盐层组成)地层之中。根据以上滑脱面的分析结果,作者认为大池干构造可以解释为滑脱褶皱和断层转折褶皱两种成因模式。在滑脱褶皱模式中,主滑脱面为8.67km处的非能干层;在断层转折褶皱模式中,该地区被认为具有上下两个滑脱面,其上滑脱面为3.53km处的非能干层,而其下滑脱面为7.79km处的非能干层。两种模式所对应的面积深度直线都具有较好的相关性,表明两种构造解释都具有内部岩层一致性,剖面达到平衡,故具有相对的合理性。

关 键 词:平衡与恢复  面积平衡法  大池干构造  滑脱深度  滑脱褶皱  断层转折褶皱

THE REGIONAL DETACHMENT OF DACHIGAN THRUST BELT, EASTERN SICHUAN: RESULTS FROM GEOLOGICAL SECTION RESTORATION BASED ON AREA-DEPTH TECHNIQUE
LIU Yuping,ZHANG Jie,YIN Hongwei,XU Shijin.THE REGIONAL DETACHMENT OF DACHIGAN THRUST BELT, EASTERN SICHUAN: RESULTS FROM GEOLOGICAL SECTION RESTORATION BASED ON AREA-DEPTH TECHNIQUE[J].Geotectonica et Metallogenia,2008,32(4).
Authors:LIU Yuping  ZHANG Jie  YIN Hongwei  XU Shijin
Abstract:This paper reviewed the principles and procedures of Area-Depth technique,and then applied this technique to interpret Dachigan structure,Eastern Sichuan.Based on the corresponding area-depth diagram and measuring the excess area and depth of seven strata,we propose that there were three potential large-scale regional detachments in this region.The first potential detachment is the middle Triassic gypsum,salt and shale at the depth of 3.53km.The second potential detachment has a depth of 7.79 km,which is the lower Cambrian shale,gypsum,and salt.The other potential detachment lies on the lower Cambrian shale,gypsum,and salt,with a depth of 8.67 km.The above three detachments are corresponding to two different models of the Dachigan structure.The first model is the detachment folding.In this model,we interpreted the Dachigan structure as an anticline deformed above the regional detachment of the lower Cambrian at the depth of 8.67 km.Alternatively,we interpreted the Dachigan structure as fault-bend fold with an upper detachment at the depth of 3.53 km and a lower detachment at the depth of 7.79km.In both models,the area-depth diagram has good correlation,which means that both interpretations are internally consistent and balanced,and hence reasonable.
Keywords:Balancing and restoration  area-depth  Dachigan thrust belt  detachment depth  detachment fold  fault-bend fold
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