赣闽粤地区早、中侏罗世构造地层研究  

STUDY OF THE EARLY-MIDDLE JURASSIC TECTONO-STRATIGRAPHY IN THE JIANGXI-FUJIAN-GUANGDONG REGION, SE CHINA

作　　者：王彬[1] 舒良树[1] 杨振宇[1] 

机构地区：[1]南京大学地球科学系,江苏南京210093

出　　处：《地层学杂志》2006年第1期42-49,共8页Journal of Stratigraphy

基　　金：国家自然科学基金项目(No.40172067;40132010;40572118);教育部研究项目;南京大学研究生教育创新研究项目;中国大陆超深钻工程和南京大学成矿作用国家重点实验室联合资助

摘　　要：对中国东南部浙闽赣湘粤地区侏罗纪以来的沉积地层和赣闽粤一带的早侏罗世—中侏罗世的地层特征和沉积规律进行了研究,结果表明:1)晚三叠世—早侏罗世时赣闽粤地区为东南高西北低的古地理格局,沉积环境差异明显;2)中侏罗世时受古太平洋板块在日本一带俯冲作用的影响,中国东南部发生了构造转换,构造格局发生了明显变动,以再一次的挤压隆升和山前快速堆积为特征,并使区域地层和构造格局从原先的近东西方向展布变成北东方向,尤以南岭东段的武夷山西部表现最明显,使早侏罗世的山地范围朝西北方向扩展,但是在南岭地区的闽西—赣南—粤北一带则以陆内裂谷和双峰式火山作用为特征,其成因可能与其深部动力学背景密切相关;3)从中侏罗世开始,在古太平洋板块强烈俯冲作用下,研究区逐步发生了从古亚洲—特提斯构造体制向古太平洋构造体制的转换,早白垩世已经完成这一构造转换,原先的近东西向构造域已经基本被北东向构造域所取代。中侏罗世是构造体制转换的重要时期,转换位置可能在南岭东段。To understand the geotectonic transition from paleo-Asian-Tethys regime to paleo-Pacific regime in SE China, this paper analyzed geological features of the Early Jurassic-Middle Jurassic sedimentary basins in the Jiangxi-Fujian-Guangdong region including distribution of basin, sedimentary features, petrological assemblages, and paleogeographic evolution, and so on. Study results suggest that 1） the paleogeographic framework of higher landform to the southeast side and depression to the northwestern side had been preliminarily developed during the Early Jurassic, which was revealed by sedimentary features from terrestrial coarser clastic rocks to fine clastic rocks from southeast to northwest; 2） during the Middle Jurassic, except the northern Guangdong-southern Jiangxi region, a further uplifting process that enhanced the Early Jurassic paleogeographic framework took place in the most part of SE China, causing an expansion of mountain relief toward inland. In some districts, the EW-striking strata and tectonic bodies were locally changed to NE-striking ones. The geodynamic setting was likely related to the subduction of paleo-Pacific plate along the Japanese continental margin; the western Fujian-southern Jiangxi rifting basin group of bimodal volcanic-intrusive rocks and the granitic magmatism dated at 170-180Ma in the Nanling region implied that paleo-Pacific magmatic activity had influenced these areas ; 3） most areas of SE China belonged to paleo-Asian-Tethys tectonic regime in the Early-Middle Jurassic. From the Middle Jurassic, study area had gradually changed the paleo-Asian-Tethys tectonic regime to the paleo-Pacific tectonic regime; strong volcanic eruption and granitic intrusion dated at 130-110Ma and preponderant attitude of NE-striking strata and tectonic outline in the Southeast China demonstrated that during the Early Cretaceous, geotectonic transition from paleo-Asian-Tethys regime to paleo-Pacific regime had been performed. So the Middle Jurassic seems to be an important geological period of

关 键 词：地层特征 盆地构造 早侏罗世 中侏罗世 构造体制转换 江西 福建 广东 

分 类 号：P534.52[天文地球—古生物学与地层学] P539[天文地球—地质学]