Subduction of the Paleo Pacific Plate at the southeast edge of the South China Block during the Early to Middle Jurassic: Sedimentary records from Fujian Province
Long Leng, Zhongjie Xu, Kunning Cui, Shiyao Gao, Ningchen Sun
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引用次数: 0
Abstract
During the Mesozoic, the tectonic evolution of the southeastern margin of the South China Block was mainly influenced by the subduction of the Palaeo-Pacific Plate. The sedimentary basins along the southeastern margin of the South China Block have preserved the sedimentary record of this process. In this paper, the sedimentary rocks of the Lishan Formation and Zhangping Formation in the Zhangping area of the southeastern margin of the South China Block are studied in terms of sedimentology, petrography, lithogeochemistry, U–Pb chronology of detrital zircon, and zircon trace elements. The study shows that the detrital zircon U–Pb age of the Lishan Formation is 2965–202 Ma, with two major age groups: 253–220 Ma and 1925–1799 Ma; the detrital zircon U–Pb age of the Zhangping Formation is 2587–190 Ma, with two major age groups: 246–234 Ma and 1929–1861 Ma; the ancient sediments in the samples are affected by recycle, and the Early Jurassic source area in the study area is an acidic magma zone, while the Middle Jurassic source area is located in a moderately acidic magma zone and recycle body; the Early Jurassic Lishan Formation and Middle Jurassic Zhangping Formation are mainly derived from the Wuyi Massif. In the upper section of the Lishan Formation, the secondary age groups of ca.448 and ca.773 Ma occur, and the detrital zircons in this section are mainly from the Jiangnan orogenic belt. The ongoing subduction of the Paleo-Pacific Plate led to the formation of diverse back-arc basins within the region; during the Early Jurassic, it was a back-arc compressional basin, transitioning into a back-arc extensional basin during the Middle Jurassic.
中生代时期,华南地块东南缘的构造演化主要受古太平洋板块俯冲作用的影响。华南地块东南缘的沉积盆地保存了这一过程的沉积记录。本文从沉积学、岩相学、岩石地球化学、碎屑锆石U-Pb年代学和锆石微量元素等方面对华南地块东南缘漳平地区的黎山层和漳平层沉积岩进行了研究。研究表明,里山组的锆英石U-Pb年代为2965-202Ma,分为253-220Ma和1925-1799Ma两大年龄组;漳平组的锆英石U-Pb年代为2587-190Ma,分为246-234Ma和1929-1799Ma两大年龄组:样品中的古沉积物受循环影响,研究区早侏罗世源区为酸性岩浆带,中侏罗世源区位于中酸性岩浆带和循环体中;早侏罗世里山组和中侏罗世漳平组主要来源于武夷山地块。在里山地层上段,出现了约 448 Ma 和约 773 Ma 的第二年龄组,该段的碎屑锆石主要来自江南造山带。古太平洋板块的持续俯冲导致该地区形成了多种多样的弧后盆地;早侏罗世为弧后压缩盆地,中侏罗世过渡为弧后伸展盆地。
期刊介绍:
Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication.
Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.