摘要
作者在近几年找到多处大中型金矿及科研工作基础上，对东天山康古尔塔格地区大地构造、韧性剪切带、岩浆岩、地层和物化条件等进行了分析。提出矿带产于岛弧－海沟系，韧性剪切带控制金矿床，韧性剪切带内韧－脆性断裂控制金矿体分布，中－中酸性火山岩为主要容矿岩石，Ⅰ型花岗岩为矿液流动提供热能和部分矿质，金异常主要集中在岛弧带北缘，恰好位于莫霍面升高处。据此划分出三个成矿亚带；岛弧北缘金铜成矿亚带；海沟浊积岩型铜金成矿亚带；矽卡岩型硅灰石成矿亚带。并对各成矿亚带作了分析讨论。
Kangguertage gold belt of eastern Tianshan is situated at the junction of Tarimu Plate and Zhungar Plate, and is a part of an island arc and trough system consisting of Aqishan-Yamansu Island Arc and Huangshan-Qiugamintashi Sea Trough. Based on having found several big and middle gold deposits and much scientitic research in the gold belt, the authors analyses tectonics, ductile shear zones, strata,magmatic activity, geophysical and geochemical condition etc. Ore bodies are usually hosted in volcanic rocks of intermediate to acid composition. There are a series of intrusions of the similar composition along the belt. The most important thing is that the gold belt is situated at the island arc and trough system,and that gold deposit are coutrolledy by the ductile shear zones, but ore bodies are strictly controlled by ductile to brittle fracture of the d. s. z. I-type granite, whose U-Pb age is 236Ma and Rb-Sr isochron age is 248Ma,provided thermal energy and partial ore substances for flow of ore solution.Gold geochemical anomalies are mainly concentrated in the north part of the island arc, which is exactly situated at the elevation of the Moho face. So the gold mineralization belt can be divided into three metallogenic subbelts from south to north: (1)north edge gold-copper metallogenic subbelt of Aqishan-Yamansu Island Arc; (2)Turbidite-type copper-gold metallogenic subbelt of Huangshan-Qiugemintashi Sea Trough; and (3)Skarn type wollastonite ore-forming subbelt of kangguertage fracture zone.
出处
《地质找矿论丛》
CAS
CSCD
1994年第4期49-56,共8页
Contributions to Geology and Mineral Resources Research
