摘要
本文依据南沙海域实际地震测线资料,相关证据显示早中新世(T_(60)-T_(40)之间)南沙腹地多盆地发生挤压反转构造,南沙西南部多见挤压褶皱。南沙海域及周边地区在早中新世开始发生全区的挤压隆升和剥蚀,经过局部剥蚀量和构造抬升量定量估算,认为隆升核心区域的九章盆地由于挤压隆升导致的地层剥蚀量大于3 500 m。"早中新世挤压隆升幕"形成一个以郑和隆起为核心的"碟形"剥蚀区,活动时间与西南次海盆的扩张时间一致,西南次海盆的扩张可能是造成隆升幕的重要原因。由于隆升剥蚀前存在深埋,南沙腹地(九章盆地为代表)和南沙北缘(中业、永登盆地为代表)的"浅、薄、小"盆地群的价值不容忽视。
Based on the actual seismic lines in Nansha basins, this article analyzed and relevant evidence to show that the middle Nansha had happened tectonic inversion at various basins, extrusion folds was common find in the southwest Nansha in Early Miocene(T_(60)-T_(40)). The Nansha basins and surrounding area began tectonic inversion and erosion under the action of compression force from the southwest sub-sea basin in the Early Miocene. After quantitative estimate of the amount denudation and uplift, that reveals out that the denudation of Jiuzhang Basin(which was the core area of uplift)caused by compression and uplift was greater than 3 500 m. The rifting fault terrace in Zhongye Basin was response to reactions of the southwest sub-sea basin opening. The"Early Miocene compressional uplift episodes"formed a"dish-shaped"denudation zone with Zhenghe Uplift as the core, and the active time was consistent with the expansion time of the southwest sub-basin, which may be the important reason for the uplift episodes. Due to the presence of buried before uplift and erosion. The exploration potential of some "shallow, thin, small" basin in hinterland(Jiuzhang Basin represented)and the northern margin(Zhongye Basin, Yongdeng Basin represented)of Nansha is worth evaluation.
作者
关成尧
漆家福
张厚和
廖宗宝
陈玮常
Guan Chengyao;Qi Jiafu;Zhang Houhe;Liao Zongbao;Chen Weichang(Hebei Key Laboratory of Earthquake Dynamics,Langfang,Hebei 065201;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249;Institute of Disaster Prevention Science and Technology,Langfang,Hebei 065201;CNOOC Research Institute,Beijing 100028;College of Geography and Planning,Jining Normal University,Ulanqab,Inner Mongolia 012000)
出处
《地质科学》
CAS
CSCD
北大核心
2022年第1期139-155,共17页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
中央高校基本科研业务费团队项目(编号:ZY20180104)
国家自然科学基金面上项目(编号:41572202,41772200)
十二五国家重大专项(编号:2011ZX05025-005)
国家重点研发计划项目(编号:2016YFC0303902-04)
内蒙古自治区高等学校科学技术研究项目(编号:NJZY20247)资助。
关键词
南沙盆地
剥蚀
隆升幕
挤压
构造恢复
反转构造
Nansha basins
Denudation
Uplift episodes
Compression
Structural recovery
Tectonic inversion
