摘要
招掖金矿带位于胶东半岛西北部,东起招远、栖霞两县交界,西至掖县北部的渤海之滨,长约60公里,宽约15公里。该带有大、中和小型金矿床,以及金矿化点共数百处,其金矿储量约占我国的1/3,是我国目前最重要的产金基地和金矿重要远景区。 该区的基础地质问题和金矿床的成因等,各家众说纷耘。
One of the most important producing area of gold lies in the Zhaoyuan-Yexian gold belt of Northwest shandong Province in China .This paper expound-sits geochemical features of ore deposits and the origin in metallogenic temperature, property of the ore-bearing hydrothermal solution, stability isotope forming the auriferous property of rocks, etc.The temperatures of uniformity method of inclusion are 260-390‰, and they appear from high to low in ore bodies from the upper to the lower. This phenomenon repeats intermittently .The composition of inclusion, which is similar to that of Luanjiahe's granite, consists mainly of K+,Na+,Cl+ and CO2.The isotopic data of galena in six ore deposits show that it is normal Pb, which varies regularly with the distance of the north contact zone from the Luanjiahe granite. The variation of sulphide in the ore zone, characterized by rich S34, ranges from 6.5‰ to 12‰, trending to increase progressively from east to west, but varying less in each ore deposit. The points on the δD‰ δO18‰ diagrams lie in the range of magmatic hydrothermal solution- The δOl8‰ is characterized by zoning and dividing district vertically. The δC13‰ of carbonate-minerals is -5.24 to-6.66‰(average, -5.82) which is concordant with δOCl3‰ of calcite of magmaticorigin.The research of the auriferous property of the rocks shows that it is high at the later stage of granitic rocks in the same magmatic cycle, the auriferous property of the magmatic rocks is higher than that around the metamorphosed rocks, and the highest is that of the dikes concerned closely with mineralization.In conclusion, according to the research of geochemistry and auriferous property of rocks, the gold deposits are typically magmatic hydrothermal deposits from the Luanjiahe granite of Mesozoic remelting type.
出处
《吉林大学学报（地球科学版）》
EI
CAS
1983年第4期7-18,共12页
Journal of Jilin University：Earth Science Edition
