摘要
西天山地区地处古亚洲构造域天山-兴蒙成矿带的西段,经历了漫长复杂的构造演化过程,尤其是海西期强烈的构造岩浆活动,为金成矿创造了有利的条件.近几年,本区找金工作取得了突破性的进展,相继发现了阿希、望峰、大山口等金矿床,显示了良好找金前景.根据前人和笔者工作,讨论了本区主要金矿化类型浅成低温热液型(又进一步划分为冰长石-绢云母型和硅化岩型)、斑岩型、韧性剪切带型、穆龙套型等的成矿特征,在综合分析基础上,指出找矿方向.
As one of the important precious metal metal logenetic units in the Paleozoic erogenic belts in China, the West Tianshan Mountains, including Sailimu micro-massif, Boluohuoluo Early Paleozoic island arcs ,Yili Late Pateazoic rift valley, Nalati Paleozoic island arc belt and Haerke-Saaerming Paleozoic trench - arcs as a result of a complicated t.otonic evolution process, is favourable for gold ores forming. The discovery of large gold deposits like Axi and Wangling etc., 8 gold polymetallic ore deposits and more than 20 ore spots there, indicates that important breakthrough in gold ore prospecting have been made in west Tianshan Mountains. Based on the researches of predecessors and ours, the authors divided the main genetic types of gold deposits as epithermal deposit, ductile shear zone deposit, porphyry deposit and Muruntau type deposit. The epithermal type, which formed in Late Paleozoic Dahalajunshan formation volcanic rocks, are further divided into adular-sericite type and silicitied rock type. The ore-forming actions of gold deposits in the area were mainly happened in Hercynian, showing a characteristics of regional ore-forming time. The Au deposits are mainly formed in the mid-late Paleozoic continental volcanic belt on the edge of Yili rift. The ductile shear zones is related to the North Tianshan oceanic plate subduction in Shenglidaban area and the Haerke-Saaerming strench-arcs related to the South Tianshan oceanic plate subduclion to Yili sub-plate. Based on the resources analyzing, 4 Au ore-forming prospective areas are recognized, they are the Shenglidaban area in northwest Tianshan which the ductile shear zone developed well and is considered as main hunting area of ductile shear zone gold deposit, the Tulasu-Yelimodun area in middle west Tianshan which widely distributed with Lower Carboniferous Dahalajunshan formation continental volcanic-subvolcanic rocks is considered as the maim hunting area for epithermal gold deposits, the Wulansai'er-Dashankou and the Tulasudaban area in south west Tianshan which well developed with C-bearing fine fragmental rocks of upper Silurian and lower Devonian is considered as the prospective area of Muruntau type gold deposits.
出处
《新疆地质》
CAS
CSCD
2003年第4期419-425,共7页
Xinjiang Geology
基金
国家科技攻关项目(8590204)
(969150306)
地质大调查项目(199910200218)共同资助
关键词
金矿床
成因
找矿方向
西天山地区
the gold deposits
the Au-ore genetic type
the prospective area
west Tianshan Mountains
