塔吉克斯坦东杜奥巴—库河一带金矿床地质特征与成矿过程探讨

Geological characteristics and the ore-forming process of the Dongduaoba—Kuhe gold deposit in Tajikistan

东杜奥巴—库河一带金矿床位于西天山巨型成矿带“亚洲金腰带”西南部—南天山成矿省泽拉夫尚金—稀土成矿带,位于“一带一路”中心线必经之地。本文通过系统总结该金矿多年来找矿勘查工作成果,分析矿区金矿床赋矿地层、构造、侵入岩、含矿地质体等地质特征,对比区域成矿构造演化,提出金成矿过程经历了早石炭世地层(马尔古佐尔组)沉积富集期—石炭纪末逆冲推覆期—二叠纪后碰撞伸展期多期多阶段构造、热液叠加改造成矿作用,并在陡断裂、向斜、层间破碎带、滑脱带及其蚀变带等构造位置,靠近碳酸盐岩岩性界面、酸碱转换面(带)附近沉淀、容矿,其成矿背景、成因、时代与穆龙套、库姆托儿金矿类似,属同一类矿床,对区域上下一步找矿、投资具有重要指导意义。

The gold deposits in the area of Dongduofafuku river are located in the “Asian gold belt”of the giant metallogenic belt in the West Ten-zan, and the “Serafshan gold-rare Earth metallogenic belt”of the South Ten-zan metallogenic province in the southwest, which lies in the central line of the “Belt and Road”.This paper systematically summarized the achievements of prospecting and exploration. The Dongduoba-Kuhe gold deposit in recent years, analyzed the geological characteristics of the ore-bearing strata, structure, intrusive rocks and ore-bearing geological bodies of gold deposit, compared the regional metallogenic tectonic evolution, proposed the formation enrichment period of Early Carboniferous(The Maerguzuoer Formation), thrust nappe period at the end of Carboniferous, post-collisional extension period of Permian, multi-stage structure, multistage hydrothermal superimposed mineralization, and in the steep fault, syncline, interlayer fracture zone, slip zone and its alteration zone and other structural locations, sedimentation and ore accumulation near lithological interface of carbonate rocks and acid-base transition surface(zone), the metallogenic background, genesis and age are similar to the Muruntau and Kumtor gold deposits, belong to the same type of deposit.It has important guiding significance to the next step of regional prospecting and investment.