摘要
岩石压磁效应是构造应力作用的产物,根据压磁与应力二者转换计量公式和压磁矢量特性,探求压磁效应与成矿元素预富集-富集的对应关系:①压磁系数和磁化率的变化强度与断裂规模和矿床大小相对应,磁化强度大的岩石有利于金元素的富集,抗磁性矿种和铁磁性矿种分别集中与磁斥力和磁引力有内在联系;②粘滞剩磁和剩磁矫顽力是压磁不可逆性的两个重要参数,对成矿阶段所出现的抗磁性与顺磁性矿物交替规律、岩体转动使磁铁矿和黄铜矿二者对顶分布、基性程度高比重大的矽卡岩矿物呈反向分带序列的存在等都具有一定的相关关系;③含金量高的黄铁矿和方铅矿等硫化物矿石条带常平行于石英脉分布,是受压磁的大小、方向和应力三者作用的共同控制;④压磁效应和岩石粒化有利于成矿元素的富集;⑤压磁引起的电磁波效应有利于对围岩矿质的萃取和深部铁磁性元素的富集。基于压磁三重特性(与应力转换性、大小和方向性)和元素磁性四大类(铁磁性、反铁磁性、顺磁性和抗磁性)的划分,可建立构造应力-磁化强度(感磁+剩磁,压磁属剩磁的一种)-矿质聚集三者间量化关系。
The rock piezomagnetic effect is caused by the tectonic stress. This paper searches the corresponding relations between piezomagnetic effect and metallogenetic element preliminary enrichmentenrichment according to the piezomagnetic vector characteristic and the computing expressions of transform between piezomagnetic effect and stress. The main views are as follows. （1） The variational intensity of piezomagnetic coefficient and susceptibility corresponds to tectonic scale and the size of deposit. The rocks magnetized with intensity greatly enrich gold elements easy. The diamagnetic minerals and the ferromagnetic minerals centralized respectively have internal relation with magnetic repulsion and magnetic gravitation. （2） Both viscous remanent and remanence coercive force are important parameters of piezomagnetic irreversibilhy, which have something to do with alternate regularity of paramagnetic and diamagnetic mineral in metallogenetie period, magnetite perpendicular distribution to ehaleopyrite brought by the rock rotating and there is reverse zoning in skarn minerals. （3） Sulfide ores （such as pyrite and galena） with Au often are parallel to quartz vein, which are controlled by piezomagnetie size, direction and stress. （4） The piezomagnetie effect and rock granulitization are propitious to metallogenetie element enrichment. （5） Electromagnetic wave effect caused by piezomagnetism is propitious to extract wall-rock mineral and enrich ferromagnetic mineral in deep. On the basis of size, direction and transforming relation with stress of the piezomagnetism and element magnetism divided into four types, set up measuring relation among tectonic stress, magnetic intensity and mineral enrichment.
出处
《吉林地质》
2007年第4期18-24,共7页
Jilin Geology
基金
国家自然科学基金(40272051
41072036)
国家自然科学重点基金(40234051)资助
关键词
压磁效应
成矿元素
预富集
富集
Piezomagnetie effect, Metallogenetie element, Pre-enriehment, Enrichment
