河南省桐柏围山城金银矿田地质特征及找矿远景分析

围山城金银矿田的主体构成为银洞坡金矿床和破山银矿床,两个矿床的规模均为大型.笔者根据区内以往的勘查成果及野外地质调查,对成矿地质背景进行了归纳和总结.在此基础上,依据地层岩性段的含矿性、指示矿床成因的某些地球化学特征:黄铁矿中的Co/Ni比值、矿石中硫同位素(δ34S)的组成特点、碳同位素(δ13 C)组成、微量元素、成矿温度、成矿热液的PH值和氧同位素等要素的特点,得出矿田矿床的成因为多期次多成因复合型层控矿床,而不是先前认为的热液矿床.该矿田矿床受层位控制明显,具有很大的找矿潜力.

Analysis on the geological characteristics and ore-searching prospect of Weishancheng Au--Ag orefield in Tongbai county, Henan province

The main parts of Weishancheng Au--Ag orefield are Yindongpo gold deposit and Poshan silver deposit, both deposits are on large scale. According to investigation achieved and field geological survey and observation, the author has summarized the metatlogenic setting, including ore-bearing strata, ore-controlling structure, magma activity, metamorphism and so on）. On that basis, conclusion has been drawn that the deposit containing in orefield is multi-periods and multi-causes compound stratabound ore deposit, judging by the ore-bearing of each section of strata, some geochemical characteristics indicating ore genesis, Co/ Ni in pyrite, composition characteristics of S isotope （δ^34S） and C isotope（δ^13C）, O isotope, trace element, metallogenic temperature, PH value of ore-forming hydrotherm. The deposit containing in orefield is obviously controlled by geologic horizon. So good is the prospecting.