GENESIS AND PROSPECTING INDICATORS OF THE ZHENGCHA LEAD-ZINC DEPOSIT IN LAOLING AREA, JILIN PROVINCE
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摘要: 老岭地区是吉林省重要的铅锌、铜、金等有色金属成矿区带，正岔铅锌矿是该矿带中具有代表性的夕卡岩型矿床，具有多阶段、成矿物质双重来源等特征.通过对矿床的地质特征、地球化学以及地球物理特征研究，认为成矿物质主要来自中生代岩浆源和古元古代海相火山-沉积源.而含矿流体中大气水与岩浆水不同比例混合的性质，表明该矿床的“胚胎”可能在元古宙已经形成，并为火山喷发的间隙期或火山喷发向海相沉积转化过程形成.受到中生代岩浆侵位热作用使得原始“胚胎”活化、并进一步富集成矿.综合区域成矿背景，归纳并提取了控矿地质因素，建立了地物化综合找矿标志.Abstract: The Laoling area is an important lead-zinc-copper-gold metallogenic belt in Jilin Province. The Zhengcha leadzinc deposit is a typical skarn deposit in the belt, with metallogenic features of multi-stage and dual sources. Study on geology, geochemistry and geophysics shows that the ore materials are derived from the Mesozoic magma and the Paleoproterozoic marine volcanic-sedimentary source. Furthermore, the different mixing proportions between atmospheric water and magmatic water indicate that the "embryonic" of the deposit may have formed by Proterozoic era, during the volcanic eruption interval or the transition from volcanic eruption to marine sedimentation. The thermal effect of Mesozoic magmatic emplacement activated the original "embryonic", with further enrichment and mineralization. Based on the integrated analysis of regional metallogenic background and ore-controlling geological factors, a geological-geochemicalgeophysical criterion for ore prospecting is established.
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