物探与化探2024，Vol.48Issue(3)：675-683,9.DOI:10.11720/wtyht.2024.1428
辽东郑屯地区基于广域电磁法的深孔验证
Deep-hole verification of wide-field electromagnetic method-derived results in the Zhengtun area of the Liaodong region
摘要
Abstract
The development of gold deposits in the Liaodong region is considered to be controlled by the superimposed detachment fault zone of the metamorphic core complex system.The traditional view holds that the thickness of the cap rocks of the Yongning Formation in the Yongning Basin can exceed thousands of meters,thus hindering the migration of ore-bearing fluids and the formation of large-scale metal deposits.The exploration of deposits in the Liaodong region has remained within a depth of 1 km due to limited exploration efforts and insufficient research.This study obtained the resistivity distribution characteristics within a depth of 3 km in the Zhengtun area using the wide-field electromagnetic method(WFEM),ascertaining that the thickness of the cap rocks in the Liaodong region is a-round 1 km,in sharp contrast to the extremely thick cap rocks in the Yongning Formation.As verified by the 2 km deep drilling,an unconformable contact between the Yongning Formation and the underlying Archean basement was observed at a hole depth of 1 345 m,without significant structural detachment near the boundary.This study demonstrates that the thickness of the cap rocks in the Yongning Basin is merely around 1 km.Considering multistage active fault structures and densely distributed hypabyssal rock vein swarms in the area,it is preliminarily determined that the geological setting for mineralization in the Yongning Basin is akin to that of the Jiaodong gold ore concentration area.The ore-bearing metamorphic fluids or magmatic-hydrothermal fluids might have migrated to the upper part of the boundary for mineralization during the destruction of the North China craton.Overall,the Liaodong region has the potential to a-chieve breakthroughs in polymetallic prospecting,and the WFEM pinpoints the deep mineralization prediction.关键词
华北克拉通/辽东/盖层/广域电磁法/深钻Key words
North China craton/Liaodong/cap rock/wide-field electromagnetic method(WFEM)/deep drilling分类
天文与地球科学引用本文复制引用
梁维天,李帝铨,孙新胜,王东波,冯家新,李浩,樊金虎..辽东郑屯地区基于广域电磁法的深孔验证[J].物探与化探,2024,48(3):675-683,9.基金项目
辽宁省2020年财政出资项目(JH20-210000-05760) （JH20-210000-05760）
