Physical Modeling of the Jura-Type Folds in Eastern Sichuan
详细信息
- 责任者：Xie Guoai (School of Earth Sciences and Engineering ; Nanjing University ; Nanjing 210093 ; China) ; Jia Dong
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(6)
- 关键词：褶皱带 ; fold belts ; 四川 ; Sichuan Province
- 页码：p.773-788
- 图表：illus., 21 refs.
- 分类号：0300
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
Jura-type folds are well-developed in the Eastern Sichuan fold-thrust belt.This belt extends from Huayingshan Fault to Dayin Fault and is separated into two areas with different structural styles by the Qirue Fault.Ejective folds occur in the west of the Qirue Fault , while trough-like folds in the east.To better understand the controlling factors of the ejective and trough-like folds in this area , six sand box experiments with varying main controlling factors were designed to simulate the evolution of the thrustfold belt.Loose dry quartz sand and glass micro-beads were used to construct the overlying sediments. Silicone putty on basement represents the detachment layer.Different basal highs of silicone putty simulate different depth of detachment layers.The experimental results show that the basal detachment depth plays an important role in controlling deformation styles of the Jura-type folds.Deeper detachment layers result in trough-like folds , while shallower detachment layers lead to ejective folds.These experiments also suggest that micro-glass beads are appropriate to simulate overlying sediments of the Jura-type folds.We infer from these experiments that the skinned structure of Eastern Sichuan were dominated by ductile deformation.