河南南召水洞岭锌铜矿床的类型及成矿条件

The Type and Metallogenic Conditions of Shuidongling Zinc Copper Deposit in Nanzhao, Henan Province

水洞岭锌铜矿床是北秦岭造山带中铜矿远景区的典型黑矿型矿床，形成于二郎坪弧后盆地，时代为早古生代．成矿期间成矿流体以高Ｋ＋／Ｎａ＋、Ｆ－／Ｃｌ－比值和低ＣＯ／ＣＯ２比值为特征；形成温度为１９７～３３０℃，ｆＯ２为３×１０－３１～８．１×１０－３３Ｐａ，形成时的环境压力为７７．９７×１０５Ｐａ，ｐＨ值为５．７３～６．１２（３００℃）．同位素特征显示，成矿物质来源为下伏火山岩，且具有混合硫源（岩浆和海水硫）共同来源。

Shuidongling zinc copper ore deposit, which formed in Erlangping back arc basin in the early Palaeozoic Era, is situated in copper metallogenic prospect area and belongs to the typical Kurko type ore deposit. The metallogenic fluid is characterized by high K +/Na + and F -/Cl - and low CO/CO 2 ratios. The temperature, f O 2 , pressure and pH value of metallogenic fluid are 197～330℃, 3×10 -31 ～8.1×10 -33 Pa,77.97×10 5 Pa and 5.73～6.12 ( t =300℃) respectively. The isotopic features prove that metallogenic materials is derived from subjacent volcanics and the sulfur has a mixed sources (magmatic water plus seawater). In addition, the magma played a role in the mineralization.