江西南城地区中—新生代推滑覆构造研究
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摘要
通过对江西南城地区侏罗系林山群与下伏前泥盆纪变质地层、白垩纪地层与前白垩纪地层接触关系调查和谢家构造窗、竺由新村构造窗、上乌石构造窗、望天石飞来峰的发现及钻孔验证,初步厘定了区内燕山期滑覆构造和喜马拉雅期推覆构造。燕山期滑覆构造发生在中侏罗世末,主滑面沿华力西—印支构造层(D—T2)、燕山构造层(T3—K1)与下伏地层间角度不整合面扩展而成,泥盆纪—早白垩世地层为滑覆体,滑覆在前泥盆纪变质地层之上,动力学来源为太平洋板块由南东向北西对欧亚板块俯冲。喜马拉雅期推覆构造规模大、动力学机制复杂(顺层和切层推覆),彻底打破了华南地区原有的地层沉积层序,形成了现存的横向分带、纵向分层的多层叠瓦、堆垛推覆构造格局。前白垩纪地质体为外来推覆体,由南东向北西推覆堆垛在白垩纪地层之上,白垩纪地层呈"构造窗"分布于前白垩纪地质体之下,动力学来源可能为印度板块与欧亚板块碰撞形成。
Based on geological surveying and drilling verification of stratum contact relations both between Jurassic Linshan Group and underlying Pre-Jurassic metamorphic strata and between Cretaceous and Pre-Cretaceous strata,this study has newly found the Xiejia structural window,Zhuyouxincun structural window,Shangwushi structural window and Wangtianshi klippe,and moreover,has determined the Yanshanian glide and Himalayan thrust nappe structures in Nancheng area,Jiangxi. The Yanshanian glide structure occurred in the end of Middle Jurassic along the expanding surface from unconformity surfaces between D-T2/ T3-K1( gliding nappe) and lower strata( underlying strata). The dynamics of glide structures maybe relate to the subduction of Pacific plate from southeast toward northwest. The large-scale Himalayan thrust nappe structure had thoroughly altered the former strata sequence and formed present tectonic framework. This framework is composed of multiple imbricated thrust and stacking faults( bedding and cross-bedding) and behaves a feature of lateral zonation and vertical stratification. The allochthon Pre-Cretaceous mass thrusts from southeast toward northwest and stacks on the autochthon Cretaceous strata. The autochthon Cretaceous strata exhibit some windows around by Pre-Cretaceous.The dynamics of Himalayan thrust nappe structure is complicated and maybe relate to the distant effect of the collision between the Eurasian plate and the Indian plate.
Based on geological surveying and drilling verification of stratum contact relations both between Jurassic Linshan Group and underlying Pre-Jurassic metamorphic strata and between Cretaceous and Pre-Cretaceous strata,this study has newly found the Xiejia structural window,Zhuyouxincun structural window,Shangwushi structural window and Wangtianshi klippe,and moreover,has determined the Yanshanian glide and Himalayan thrust nappe structures in Nancheng area,Jiangxi. The Yanshanian glide structure occurred in the end of Middle Jurassic along the expanding surface from unconformity surfaces between D-T2/ T3-K1( gliding nappe) and lower strata( underlying strata). The dynamics of glide structures maybe relate to the subduction of Pacific plate from southeast toward northwest. The large-scale Himalayan thrust nappe structure had thoroughly altered the former strata sequence and formed present tectonic framework. This framework is composed of multiple imbricated thrust and stacking faults( bedding and cross-bedding) and behaves a feature of lateral zonation and vertical stratification. The allochthon Pre-Cretaceous mass thrusts from southeast toward northwest and stacks on the autochthon Cretaceous strata. The autochthon Cretaceous strata exhibit some windows around by Pre-Cretaceous.The dynamics of Himalayan thrust nappe structure is complicated and maybe relate to the distant effect of the collision between the Eurasian plate and the Indian plate.
引文
[1]江西省地质矿产勘查开发局,江西省地质调查研究院.江西省区域地质志[M].北京:地质出版社,2013:1-10.
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[14]余心起,吴淦国,张达,等.北武夷地区逆冲推覆构造的特征及其控矿作用[J].地质通报,2008,27(10):1667-1677.
[15]邱骏挺,余心起,吴淦国,等.北武夷篁碧矿区逆冲推覆构造及其与钼、铅-锌成矿作用关系[J].地学前缘,2001,18(5):243-255.
[16]周玉龙,高琰,曹寿孙,等.赣中相山铀矿田逆冲推覆构造系统及动力学机制[J].世界核地质科学,2011,28(3):139-146.
[17]汪昌亮,颜丹平,张冰,等.雪峰山西部中生代厚皮逆冲推覆构造样式与变形特征研究[J].现代地质,2011,25(6):1021-1031.
[18]张岳桥.广西十万大山前陆冲断推覆构造[J].现代地质,1999,13(2):150-156.
[19]林全胜.武夷山东麓中生代推覆构造与铁多金属成矿规律研究[D].北京:中国地质大学(北京),2013.
[20]陶建华,陈福龙.福建推覆构造研究[J].石油实验地质,2006,28(3):259-263.
[21]王森,吕良冀,张达,等.闽西南广平推覆构造应力场特征及平衡剖面研究[J].地球科学前沿,2013,3(2):97-105.
[22]余心起,舒良树,邓国辉,等.江西吉泰盆地碱性玄武岩的地球化学特征及其构造意义[J].现代地质,2005,19(1):133-140.
[23]郑文,张芳荣.吉—泰盆地碱性系列基性侵入岩特征及其构造意义[J].江西地质科技,1996,23(增刊):57-61.
[24]LI Jianhua,ZHANG Yueqiao,DONG Shuwen,et al.Cretaceous tectonic evolution of South China:a preliminary synthesis[J].Earth-Science Reviews,2014,134:98-136.
①江西省地质调查研究院.1∶25万抚州市幅区域地质调查报告[R].南昌:江西省地质调查研究院,2007.
[2]梅勇文.江西南部推(滑)覆构造系统研究[J].江西地质,1997,11(3):51-59.
[3]张德宝,梁继涛,薄志宏.武夷—云开构造带北段构造变形及演化[J].火山地质与矿产,1991,12(3):37-48.
[4]刘亚光.江西恐龙蛋的分类及层位[J].江西地质,1999,13(1):2-6.
[5]PEARCC J A,CANNJ R.Tectonic setting of basic volcanic rocks determined using trace element analysis[J].Earth and Planetary Science Letters,1973,19:290-300.
[6]朱勤文,王方正,路凤香,等.湖南中新生代玄武岩岩石学特征[J].现代地质,1996,10(4):461-469.
[7]钟南昌,黄金喜,诸宝森,等.江西宜丰—乐平推覆构造特征及找矿研究[J].江西地质,1991,5(5):11-16.
[8]钟南昌.江西萍乡—乐平地区推覆构造[J].中国区域地质,1992(1):1-11.
[9]李均辉,廖永珍,何伟相.赣中峡江地区推滑覆构造特征及成因机制[J].中国地质,2002,29(4):382-386.
[10]崔学军,刘春根,钟达洪,等.井冈山逆冲推覆构造基本特征及找矿意义[J].大地构造与成矿学,2003,27(1):43-47.
[11]吴安国.江西主要推覆构造的基本特征、形成机制及控矿作用[J].中国区域地质,1990(1):37-48.
[12]马逸麟,梅丽辉.丰城洛市地区推、滑覆构造特征及其成因探讨[J].江西地质,1997,11(2):14-19.
[13]马逸麟,梅丽辉.信丰大桥煤田推覆构造特征及其对煤系(层)的控制[J].江西地质,1999,13(1):14-19.
[14]余心起,吴淦国,张达,等.北武夷地区逆冲推覆构造的特征及其控矿作用[J].地质通报,2008,27(10):1667-1677.
[15]邱骏挺,余心起,吴淦国,等.北武夷篁碧矿区逆冲推覆构造及其与钼、铅-锌成矿作用关系[J].地学前缘,2001,18(5):243-255.
[16]周玉龙,高琰,曹寿孙,等.赣中相山铀矿田逆冲推覆构造系统及动力学机制[J].世界核地质科学,2011,28(3):139-146.
[17]汪昌亮,颜丹平,张冰,等.雪峰山西部中生代厚皮逆冲推覆构造样式与变形特征研究[J].现代地质,2011,25(6):1021-1031.
[18]张岳桥.广西十万大山前陆冲断推覆构造[J].现代地质,1999,13(2):150-156.
[19]林全胜.武夷山东麓中生代推覆构造与铁多金属成矿规律研究[D].北京:中国地质大学(北京),2013.
[20]陶建华,陈福龙.福建推覆构造研究[J].石油实验地质,2006,28(3):259-263.
[21]王森,吕良冀,张达,等.闽西南广平推覆构造应力场特征及平衡剖面研究[J].地球科学前沿,2013,3(2):97-105.
[22]余心起,舒良树,邓国辉,等.江西吉泰盆地碱性玄武岩的地球化学特征及其构造意义[J].现代地质,2005,19(1):133-140.
[23]郑文,张芳荣.吉—泰盆地碱性系列基性侵入岩特征及其构造意义[J].江西地质科技,1996,23(增刊):57-61.
[24]LI Jianhua,ZHANG Yueqiao,DONG Shuwen,et al.Cretaceous tectonic evolution of South China:a preliminary synthesis[J].Earth-Science Reviews,2014,134:98-136.
①江西省地质调查研究院.1∶25万抚州市幅区域地质调查报告[R].南昌:江西省地质调查研究院,2007.