胶东望儿山断裂带陈家—付家金矿床黄铁矿标型特征研究  

TYPOMORPHIC CHARACTERISTICS OF PYRITE FROM THE CHENGJIA FUJIA GOLD DEPOSITS ALONG THE WANGERSHAN FAULT, EASTERN SHANDONG

作　　者：赵利青[1,2] 王小华[1,2] 李自杰 苑保钦[1,2] 

机构地区：[1]北京大学地质学系 [2]武警黄金地质研究所

出　　处：《矿床地质》1997年第1期71-78,共8页Mineral Deposits

基　　金：国家黄金局资助项目

摘　　要：金矿床产于切割黑云母花岗岩和钾长变斑花岗闪长岩的北东向望儿山断裂中，沿断裂带从北到南产出界河、上庄、王家沟子、河东、付家等５个中型金矿床。矿床均属于断裂破碎带蚀变岩型，或称“焦家式”。黄铁矿是主要的载金矿物。对产于不同矿床中的黄铁矿的晶形、热电性、爆裂温度、微量元素进行了分析研究，认为从北到南黄铁矿的平均爆裂温度有增高的趋势，爆裂频数则有降低的趋势，总体上分为１５０～２００℃和２３０～２７０℃两组。The study area is located in eastern Shandong where gold deposits are concentrated. Along the NE trending Wangershan fault 8 km in length that cuts biotite granite and K feldspar porphyroblastic granodiorite there exist from north to south 4 middle size gold deposits, namely Jiehe, Shangzhuang, Hedong and Fujia, which are all fault shatter zone altered rock deposits called “Jiaojia type”, with pyrite being the main gold carrier mineral. Pyrite from various deposits was studied in the light of crystal form, pyroelectricity, decrepitation temperature, chemical composition and trace elements. Ore microscopic study demonstrates that native gold is associated with tetradymite, chalcopyrite and galena in cracks of pyrite crystals. These minerals serve as indicators of pyrites related to gold mineralization. Pyroelectricity coefficients of pyrite vary considerably along the whole fault zone, suggesting that N type pyrite is dominant, with merely small amounts of P type pyrite seen in Fujia and Hedong deposits. From Fujia through Hedong, Shangzhuang to Jiehe, pyrite with {100} crystal form gradually decreases in amount whereas things are just the opposite for pyrite with {111} and {100}+{111} crystal forms. As for trace elements in pyrite, Bi and Te are positively related to gold, and pyrite with high Se and Ni is generally related to gold mineralization. From north to south, average decrepitation temperature of pyrite tends to increase, whereas decrepitation frequency seems to decrease. In general, two groups of decrepitation temperature (150￣200℃ and 230￣270 ℃) can be recognized, and pyrite of the former group contains very high gold.

关 键 词：金矿床 黄铁矿 标型特征 矿床地质 

分 类 号：P618.510.4[天文地球—矿床学] P618.510.2[天文地球—地质学]