摘要
河北省涞水县安妥岭钼矿是一个大型斑岩钼矿,有望成为超大型钼矿床。文章以安妥岭斑岩钼矿EH4测深剖面所揭示的深部精细电阻率结构为基础,结合钻孔(ZK1004和ZK1403)岩心编录成果分析,认为物性结构的分布型式与透岩浆流体的自组织行为有关,见矿深度位于电阻率急剧变化的位置,进而提出地质体地质结构的地质学完整性+地球物理学不完整性可作为找矿标志。
High resolution resistivity structure features of geologic units from surface to --1000m under- ground by EH4 Magnetotelluric method in Antuoling porphyry Mo deposit are recognized. Double-layered structure of higher resistivity anomalies in four EH4 sections has been shown vividly and is characterized by discontinuous and small size higher resistivity anomalies in upper part, continuous and bigger size high- er resistivity anomalies in lower part. According to the geologic features and drill hole logging, higher re sistivity anomalies distributed in south and north part of EH4 sections are the representation of gneiss, and higher resistivity anomalies in shallower and deeper of middle area in EH4 sections are the representa- tion of quartz porphyry, granodiorite porphyry and breccia resulted mainly from granodiorite porphyry. Lower resistivity anomalies in deeper EH4 sections are match of the products of alteration, which has sug- gested the lower resistivity anomalies are likely to be the record of deep fluid activities. Both higher and lower resistivity anomalies are complex shape, and the contacts of them are gulf-like contours that are considered the interaction between deep fluid and incomplete consolidation magma. In process of seconda- ry boiling and cryptoexplosion resulted from deep fluid （transmagmatic fluids） injecting into incomplete consolidated magma, mineralization materials was unloaded because of the sharp pressure decrease, and effectively enclosed by shallower magma and wall rock of gneiss. Three exploration targets are discussed in EH4 sections of Antuoling porphyry Mo deposit on the basis of combination between geologic integrali- ty and geophysical unintegrality, such as lower resitivity anomalies under --1000m in EH4 sections, oc- currence torsion part of deeper igneous body, and the top of bigger size higher resistivity anomalies dis- played resistivity dispersional structure.
出处
《地质找矿论丛》
CAS
CSCD
2013年第4期594-603,共10页
Contributions to Geology and Mineral Resources Research
基金
中国地质调查局地质调查项目(编号:1212011220921)
河南省国土资源厅科技攻关项目(编号:2011-622-25
2011-622-36)
天津华北地质勘查总院科研项目(编号:KY2008-2)联合资助
关键词
安妥岭
高频大地电磁法
斑岩钼矿
透岩浆流体
深部找矿
太行山地区
Antuoling, EH4 magnetotelluric section, porphyry Mo deposit, Transmagmatic fluids,deep ore prospecting, Taihang Mountain
