地质通报2024，Vol.43Issue(2)：289-301,13.DOI:10.12097/gbc.2023.04.007
华北克拉通东北缘改造:来自吉林辉南地区构造热事件的古地磁记录
Reconstruction of the northeastern margin of the North China Craton:Paleomagnetic records from tectonic thermal events in Huinan of Jilin Province
摘要
Abstract
The northeastern margin of North China Craton is located in an active area of tectonic movement.Paleomagnetic study can provide a basis record for tectonic evolution and magmatic thermal events.246 samples were collected from 32 mining sites of the Middle Cambrian in Huinan area,Jilin Province,for petrology,rock magnetism and systematic thermal demagnetization experiments.Rock magnetic study implies that the main magnetic minerals of the Xuzhuang Formation sandy mudstone are hematite and magnetite.The main magnetic minerals of the Zhangxia Formation limestone are magnetite with smaller particles and a small amount of pyrite.Stepwise thermal demagnetization succeeded in isolating the middle-temperature characteristic directions of the samples.The average direction of the Xuzhuang Formation(D/I = 10.9°/50.8°,α95 = 11.7°,corresponding pole position is 76°N,264.6°E,A95 = 13°),indicates that magmatic activity in the Early Cretaceous affected it.The average direction of the Zhangxia Formation(D/I = 29.1°/59.0°,α95 = 6.5°,corresponding pole position is 68°N,213.7°E,A95 = 8.4°)were remagnetized which is related to Quaternary volcanic activity.Based on the analysis of regional geological background,at least two strong tectonic thermal events may have occurred from the Early Cretaceous to Quaternary respectively in Huinan area of Jilin Province,which also moved toward north large distance affected by Dunhua-Minshan sinistral slip fault during that time.These magnetic minerals were all remagnetizd and recorded a stable middle-temperature characteristic direction.关键词
华北克拉通东北缘/中寒武世/重磁化/构造热事件Key words
northeastern margin of North China Craton/Middle Cambrian/remagnetization/tectonic thermal event分类
天文与地球科学引用本文复制引用
金继浩,任收麦,王胜建,刘永江,侯啓东,刘一珉,王浩..华北克拉通东北缘改造:来自吉林辉南地区构造热事件的古地磁记录[J].地质通报,2024,43(2):289-301,13.基金项目
国家自然科学基金项目《松嫩和佳木斯地块晚古生代构造重建:来自古地磁的约束》(编号:41472197)、科技部重点研发计划项目《东亚俯冲陆缘的构造变形响应与转换》(编号:2022YFF0800401-2)、泰山学者计划《洋陆过渡带构造演化研究》(编号:ts20190918) （编号:41472197）
