辽东青城子矿集区铅锌和金银矿床成生关系

GENETIC CONNECTION BETWEEN THE LEAD-ZINC AND GOLD-SILVER DEPOSITS IN THE QINGCHENGZI ORE CONCENTRATION AREA IN EASTERN LIAONING

辽东青城子矿集区由青城子铅锌矿床和其外围的金银矿床组成,是中国北方重要铅锌金银矿产地之一.矿集区内铅锌金银矿分布严格受含矿建造控制,铅锌矿主要赋存于辽河群大石桥岩组第3岩段中下部,而金银矿主要赋存于大石桥岩组第3岩段上部和盖县岩组下部.在成矿时代上,铅锌矿主要形成于古元古代—中生代,矿床成因属于沉积变质-岩浆热液改造型,而金银矿床形成受中生代岩浆-构造作用控制.铅锌矿床与其外围的金银矿床相伴而生,且两者具有一定的成生联系.

The Qingchengzi ore concentration area in Eastern Liaoning Province, consisting of the Qingchengzi lead-zinc deposit and the gold-silver deposits in periphery, is an important site for lead, zinc, gold and silver resources in North China. The distribution of the deposits is strictly controlled by the ore formations. The lead-zinc deposits occur mainly in the middle and lower parts of the third member of Dashiqiao formation, Liaohe Group. While the gold-silver deposits are hosted by the upper part of the third member of Dashiqiao formation and lower Gaixian formation. In regard to the mineralizing periods, the lead-zinc deposits were mostly formed in Paleoproterozoic to Mesozoic eras, genetically belonging to sedimentary metamorphic-magmatic hydrolhermal reformation type. The forming of the gold-silver deposits was control by Mesozoic magmatism and tectonics. It is concluded that the lead-zinc deposits and the peripheral gold-silver deposit are associated with each other, in a certain genetic correlation.