西北地质2012，Vol.45Issue(4)：134-144,11.
甘肃肃北黑山镍铜矿床产出特征及对比研究
Comparative Study on the Characteristic Occurrences of Heishang Ni-Cu Deposit in Subei County of Gansu Province
摘要
Abstract
Heishan Ni-Cu deposit is situated on the Heishan-Jiznquanzi Fault which is the south margin of Mazongshan middle block within Kazakhstan paleo- plate. The fault has the characteristics of marginal rift on the edge of paleo- plate, and regionally, the fault and rock mass appear the obvious gravity and magnetic anomaly. The ore-bearing rock body intruded into dolomite marble of Qingbaikou Series Dahui-oiuoshan Group, and Cambrian Shuanyingshan Formation carbonaceous-sificeous-slate, metamor-feldspar-quartz-sandstone and baritic rock. Viewing from the surface, the body is the pear shape with the outcrop area of nearly 0. 25 km2, slightly longer on the NW direction, about 800 m long and 470 m wide. It is a complex massif developed from multi-intrusive of the same source and period, mainly comprised of plagio-harzburgite, hornblende-olivinite, olivine-hornblende-gabbro, and hornblende gabbro. The first phase is hornblende-gabbro facies which consist of hornblende-gabbro and quartz-syenite block within gabbro. The second phase is olivine-hornblende-gabbro and plagio-harzzburgite facies which consist of olivine-hornblende-gabbro, hornblende-olivine-gabbro, hornblende gabbro, and plagio-harzburgite. The average of chemical composition is similar with ultrabasic rock. The basicity index σ is very low, average is 0. 05, TiO2 0. 28, m/f (Wu Liren) 4.79, Zavaritskiivalues b=56. 00, s = 39.77; m' = 81.68; Na2O>K2O, the basicity type is Pacific type. The protomagma is characterized of olivine-tholeiite, came from the upper mantle. The average value of Mg/Fe is 4. 79. Ni-Cu orebody with appearance of len, vein and stratiform-like mainly exist the middle and lower part of rock mass. Mother rock and ore-bearing rock mainly consist of harzbeugite, secondly hornblende-gabbro. The ore body is classified into 3 types; insitu liquation, late period injection and contact metamorphic body. The ore minerals include niccolite, chloanthite, chalcopyrite, millerite, magnetic pyrite, chalcocite, as well as some pyrite, violarite and natural copper. The metal oxide is magnetite. The associated elements have Co, Pt, Pd, Au, Ag, Os, Ir, Ru, Rhodium, Se, Te, Cr etc. The harmful elements have Pb, Zn, As, Bi. The chemical composition of ore is characterized of poor alkali, lower aluminium and calcium. Although a little differences of scale and neme-racalvalues, Heishan Ni-Cu deposit has the same condition with Jnchuan Ni-Cu deposit on geological setting of diagenesis and metallogensis, gravity and magnetic anomaly, occurrence of ore-bearing rock body, feature of ore body, petrochemistry and metallogenic elements, generally, these reflected similarity and consistency of two deposits on diagenesis and metallogenesis. Heishan district would be expected to be potential in depth. Regionally, around the area of gravity and magnetic anomaly on the deep-great fault at the edge of archicontinent or old block, the prospecting targets for magmatic Ni-Cu deposit should be focused on multi-phase intrusive outcrop or small scale concealed basic-ultrabasic complex body with anomaly zone of Fe, Cr, Ni, Co, V, Cu, Zn, Mn.关键词
黑山铜镍矿/地质背景/产出特征/金川铜镍矿/对比研究Key words
Heishan Ni-Cu deposit/ geological setting/ occurrence/ Jinchuan Ni-Cu deposit/ comparative study分类
天文与地球科学引用本文复制引用
张新虎,冯军,殷勇,孙金兰..甘肃肃北黑山镍铜矿床产出特征及对比研究[J].西北地质,2012,45(4):134-144,11.基金项目
2006～2010年甘肃省矿产资源补偿费(甘财建[2006]73号)项目"甘肃省1∶100万地质矿产图",甘肃省重大科技专项(1002FKDA042) （甘财建[2006]73号）
