新疆西南天山果儿沟铁锰矿床地质特征与成因探讨

西南天山成矿带是我国重要的铁锰多金属成矿带之一,对新疆西南天山果儿沟铁锰矿床地质特征与成因的探讨对该区域铁锰找矿具有指导意义。通过野外地质调查和矿床地质特征、岩石学特征、矿石地球化学等分析总结,获得以下结论:(1)果儿沟铁锰矿床产于下石炭统图尤克阿秀组(C1ty)下段海相火山岩与沉积岩的岩性界面,受地层和火山旋回控制,具沉积型矿床特征;(2)铁矿石金属矿物主要为赤铁矿,锰矿石金属矿物为硬锰矿、软锰矿;(3)铁锰矿石地球化学特征显示该矿床具有热水沉积矿床的特征;(4)铁、锰矿体形成于海底火山喷发活动的末期,铁锰矿床成因类型为海相火山热水沉积型。

Geological characteristics and genesis of Guoergou Ferromanganese ore deposit in Southwestern Tianshan, Xinjiang

The southwest Tianshan metallogenic belt is one of the important Fe-Mnpolymetallicmetallogenic belts in China. The studies of the geological characteristics and genesis of the Fe-Mn deposit significantly guide for prospecting in this area. Based on field geological survey and the analysis of geological, petrological and geochemical characteristics of this deposit, we got the following conclusions:(1) The Guoergou Fe-Mn deposit is produced from the lithologic interface of marine volcanic rocks and sedimentary rocks in the lower section of the Tuyoukeaxiu group (C1ty), which is controlled by stratigraphic and volcanic cycles, and is characterized by sedimentary deposits. (2) iron ore minerals are mainly hematite and manganese ore minerals are hard manganese ore and soft manganese ore. (3) The geochemical characteristics of Fe-Mn ores show that the deposit are hydrothermal sedimentary deposits. (4)Fe-Mn orebodies are formed in the late stage of the volcanic eruption in the sea. The genesis type of this Fe-Mn deposit is marine volcanic hydrothermal sedimentary type.