中国地质2024，Vol.51Issue(1)：1-16,16.DOI:10.12029/gc20231124001
胶西北金矿控矿断裂深部特征及对找矿的启示
Deep characteristics of ore-controlling faults in Jiaoxibei gold deposits and its implications for prospecting:Evidence from geophysical surveys
摘要
Abstract
This paper is the result of mineral exploration engineering. [Objective]Jiaodong Peninsula is a famous gold metallogenic area in the world.The gold deposits are mainly controlled by fracture.Certainly,there are still many fractures in this area without ore.In the past,the deep form of the fracture and the distinction between the ore-bearing faults and the ore-free faults have not been thoroughly studied.[Methods]In this paper,the gravity,magnetic and electric length profiles,wide area electromagnetic profiles and reflection seismic profiles that traverse the main gold deposits areas in Jiaoxibei area are used to reveal the deep characteristics of the fractures,providing important evidence for the identification of ore-bearing faults and ore free faults.[Results]The geophysical detection shows that there are deep faults with steep dip angle,shovel faults with gentle dip angle and small faults with steep dip angle in Jiaoxibei area,among which the ore-controlling Sanshandao,Jiaojia and Zhaoping faults are shovel faults.Combined with the study on the gold deposits,it is found that the deposits mainly occur in the gentle dip faults,the ore bodies present the step-like mineralization pattern,while no obvious gold mineralization alteration has been found in the deep faults,and the maximum depth of the present gold deposits are about 5 km.[Conclusions]Comprehensive analysis shows that the low-angle detachment faults and the large-angle small faults have better physical trap conditions,which are conducive to mineralization enrichment.However,the deep faults with flat and steep dip do not have the condition of physical trap,which are not conducive to mineralization.The prospecting direction of Jiaodong type gold deposits should be concentrated in the vicinity of the gentle dip shovel faults and its derived and associated small steep dip faults.关键词
金矿床/深部探测/地球物理剖面/断裂构造/阶梯赋矿/矿产勘查工程/胶东Key words
gold deposits/deep exploration/geophysical profile/faults/step-like mineralization pattern/mineral exploration engineering/Eastern Shandong Province(Jiaodong Peninsula)分类
天文与地球科学引用本文复制引用
宋明春,李秀章,张尚坤,张文,李大鹏,王英鹏,董磊磊,李健,王怀洪,高继雷,朱裕振,王洪军,陈大磊,王润生,刘洪波,贺春艳,魏印涛,李杰,曹静杰,牛树银,田京祥..胶西北金矿控矿断裂深部特征及对找矿的启示[J].中国地质,2024,51(1):1-16,16.基金项目
国家自然科学基金重点支持项目NSFC—山东省联合基金"胶东深部金矿断裂控矿机理"(U2006201)资助.Supported by National Natural Science Foundation of China(NSFC-Shandong Joint Fund)"The mechanism of structural ore controlling of the deep-seated gold deposits in Jiaodong Peninsula"(No.U2006201). （U2006201）
