海洋地质与第四纪地质2024，Vol.44Issue(4)：108-122,15.DOI:10.16562/j.cnki.0256-1492.2023032802
逆冲-走滑作用叠加的复合构造变形机制砂箱模拟研究:以张家口-蓬莱断裂带渤海段为例
Sandbox modeling on the reworking of strike-slip faulting from pre-existing thrusts:A case study of Zhangjiakou-Penglai Fault Zone in Bohai area
摘要
Abstract
It is common in nature for thrust structures to form new composite structural systems under the influence of strike-slip faulting.Since the Cenozoic,the sinistral strike-slip movement of the Zhangjiakou-Penglai fault zone in Bohai basin altered the pre-existed Yanshanian thrust structure.Driven by the subduction of the Pacific Plate since the Cenozoic,the NW-trending Zhangjiakou-Penglai fault zone fault zone co-worked with the conjugate NE-trending Tancheng-Lujiang fault zone and established the modern tectonic pattern of the Bohai Bay Basin.This area is an earthquake-prone area and also an oil-gas accumulation area.To understand the mechanism of strike-slip faulting from pre-existing thrusts,we conducted sandbox modeling with various strike-slip rates and basement rigidity setting.Results show a series of thrust faults forming thrust imbricate fan and pop-up structures under compression.After the superposition of thrusting by strike-slip motion,some strike-slip faults were formed and they cut through pre-existing thrusts,presenting a flower structure.Seen in the cross-section,the larger the strike-slip rate,the more faults,the larger the fault spacing,and the more complex flower structure.In the local plastic basement model,the strike-slip zone without superposition can form a fault depression.Combined with the tectonic evolution process of the study area,the modeled results showed a similar pattern of the tectonic pattern of the Zhangjiakou-Penglai fault zone,especially those of the flower structures in the Shabei fault and Shadong fault.Therefore,the strike-slip fault played a role in controlling the tectonic trap.This study provided a reference for understanding the dynamic mechanism of tectonic superposition of strike-slip faulting and thrusting.关键词
砂箱模拟/逆冲构造/走滑构造/叠加改造/张家口-蓬莱断裂带Key words
sandbox modeling/thrust-nappe structures/strike-slip structures/superimposed transformation/Zhangjiakou-Penglai fault zone分类
海洋科学引用本文复制引用
吕春晓,郭玲莉,陶圩,张家轩,周琦杰,张京京,陈欣,王光增,李三忠..逆冲-走滑作用叠加的复合构造变形机制砂箱模拟研究:以张家口-蓬莱断裂带渤海段为例[J].海洋地质与第四纪地质,2024,44(4):108-122,15.基金项目
崂山实验室科技创新项目"基于数字孪生的全球深时地貌重塑与资源环境预测"(LSKJ202204400) （LSKJ202204400）
国家自然科学基金创新研究群体项目"海底古地貌动态重建"(42121005) （42121005）
国家自然科学基金重大计划重点支持项目(92058211) （92058211）
国家自然科学基金面上项目"走滑派生构造差异演化主控因素的砂箱实验研究:以郯庐断裂渤海-山东段张扭派生的构造为例"(42072235) （42072235）
李三忠教授泰山学者攀登计划项目(tspd20210305) （tspd20210305）
邢会林教授泰山学者特聘专家计划项目(tstp20221112) （tstp20221112）
