地质通报2016，Vol.35Issue(6)：998-1014,17.
豫西骆驼山硫多金属矿床纹层状矿石硫化物Rb-Sr定年及S同位素组成对矿床成因的制约
Rb-Sr isochron age of sulfides and sulfur isotopic com-position from lamellar ores of the Luotuoshan sulfur polymetallic deposit in western Henan Province and its constraints on the ore genesis
摘要
Abstract
There are considerable debates about the genesis of the Luotuoshan sulfur polymetallic deposit in previous studies. The fo⁃ cus of controversy lies in whether it was formed from the Meso-Neoproterozoic exhalative sedimentary mineralization or not. The lamellar ores are considered as important evidence in sedimentary exhalative mineralization ,but the hydrothermal metasomatic genesis is also possible. Therefore,determining the metallogenic epoch and ore-forming material resources of the lamellar ores is the most di⁃rect and effective way to solve these debates. In the spatial distribution, we found that the lamellar ores mainly occur between skarns and dense massive sulfide ores and some distribute in wall rock such as diopside feldspar and quartz hornfels, skarns and marbles by de⁃tailed field geological observation. The structure formed by alternate arrangement of different metallic minerals laminas and metallic minerals laminas and wall rock laminas. The geological features suggest that the lamellar ores replace skarns. In this paper ,Rb-Sr dating was carried out for nine sulfides samples (comprising six sphalerite and three pyrrhotite samples) from lamellar ores of the Luotuoshan sulfur polymetallic deposit, which yielded an isochron age of 139.6±2.6Ma, suggesting that the metallogenic epoch of Luotuoshan de⁃posit is Early Cretaceous. Sulfur and strontium isotopes of these sulfides show that δ34S values of the ores have a narrow range of+1.7‰~+3.3‰(averagely+2.44‰),with more obvious tower-shaped distributional features,and that the values of (87Sr/86Sr)i range from 0.709704 to 0.709943,with an average of 0.709823,which implies that ore-forming materials mainly originated from deep-seated magma of the lower crust. Based on the above analyses in combination with geological investigation in the field and micro⁃scope observation,the authors hold that the lamellar ores formed in Mesozoic and belonged to magmatic hydrothermal genesis, fur⁃ther indicating the Luotuoshan sulfur polymetallic deposit is a skarn deposit which belongs to magmatic hydrothermal metasomatic genesis. The results obtained by the authors provide certain theoretical guidance for the future exploration of similar sulfur polymetal⁃lic deposits in this ore concentration area and even in whole western Henan Province.关键词
硫化物Rb-Sr定年/S同位素组成/纹层状矿石/骆驼山硫多金属矿床/栾川矿集区Key words
Rb-Sr dating of sulfide/sulfur isotope composition/lamellar ores/Luotuoshan sulfur polymetallic deposit/Luanchuan ore concentration area分类
天文与地球科学引用本文复制引用
邢波,向君峰,叶会寿,陈小丹,张国苏,杨晨英,金雪..豫西骆驼山硫多金属矿床纹层状矿石硫化物Rb-Sr定年及S同位素组成对矿床成因的制约[J].地质通报,2016,35(6):998-1014,17.基金项目
国家科技支撑计划项目 （）
