高校地质学报2018，Vol.24Issue(1)：65-76,12.DOI:10.16108/j.issn1006-7493.2017047
粤东盆地早侏罗世金鸡组物源分析及其对华南构造背景的约束
Detrital Provenance of the Lower Jurassic Jinji Formation and Its Constrains to the Early Jurassic Geodynamic Background of South China
摘要
Abstract
Early Mesozoic geodynamic background of the South China Block(SCB) is still controversial. The Late Triassic-Early Jurassic Eastern Guangdong basin locates at southeastern margin of the SCB and contains key records of its geodynamic background. Detrital zircon LA-ICP-MS dating was carried on the Lower Jurassic Jinji Formation in the basin in this study.The results display eight age peaks,i.e.ca.196 Ma,247 Ma,320 Ma,432 Ma,770 Ma,1060 Ma,1820 Ma,and 2430 Ma.Provenance analysis suggests that the sources of the Lower Jurassic Jinji Formation were mainly derived from the northeast and north directions.Correlation of the detrital zircon age spectra reflects that the studied basin resembles the Yongan basin to the northeast and Dongkeng basin to the north. Integrated analysis of the sediment provenance,petrology and geochemistry of the Jinji Formation reveals that the Early Jurassic basins in southeastern China, even though bear characteristics of passive continental margin, already received sediment supply from the uplifts in more eastern region resulted from the northwestern subduction of the paleo-Pacific plate toward the SCB.关键词
华南板块/早侏罗世金鸡组/碎屑锆石/源区分析/构造背景Key words
South China Block/Lower Jurassic Jinji Formation/detrital zircon/sediment provenance/tectonic setting分类
天文与地球科学引用本文复制引用
刘念,姜宝玉,周雪瑶,周卫明..粤东盆地早侏罗世金鸡组物源分析及其对华南构造背景的约束[J].高校地质学报,2018,24(1):65-76,12.基金项目
国家自然科学基金(41330208 （）
41672010) （）
