赣北萍乐拗陷是对冲构造还是巨型构造窗?  

Is the Pingle depression a ramp faults zone or a huge tectonic window?

作　　者：宋鸿林[1] 朱忠[1,2] 颜丹平[1] 

机构地区：[1]中国地质大学 [2]江西应用技术职业学院,江西赣州341000

出　　处：《地质通报》2003年第2期124-129,共6页Geological Bulletin of China

基　　金：国家自然科学基金项目(40172070)资助。

摘　　要：对“板溪群”构造属性的认识存在多种观点,各家观点都有证据支持,但相互之间又有矛盾。综合分析多家研究成果,多方面证据显示江西境内的萍乐拗陷很可能是一个巨型构造窗,沿萍乡至乐平一带出露的晚古生代至早三叠纪地层是原地系统,附近的“板溪群”是外来系统,上古生界中的对冲构造可能是另一期的构造。这一带的“板溪群”既包含有前震旦纪变质岩系,同时更可能包含有中生代的构造混杂岩的成分。There are several views regarding the tectonic significance of the'Banxi Group'.Each of them is supported by some evidence but conflicts with other geological facts.An integrated analysis of the re-search results obtained by previous researchers,combined with the authors' reconnaissances in several areas,shows that the Pingle depression in Jiangxi is most likely to be a huge tectonic window rather than a ramp faults zone.The Late Paleozoic-Early Triassic strata exposed in the Pingxiang-Leping area might be an autochthon,while the'Banxi Group'nearby might be an allochthon.The ramp structure in the Up-per Paleozoic might be the structure of another generation.The'Banxi Group'in the area consists of both Pre-Sinian metamorphic series and more possibly Mesozoic tectonic mélange.

关 键 词：板溪群 萍乐拗陷 构造窗 江西 

分 类 号：P54[天文地球—构造地质学]