摘要
冈底斯成矿带位于西藏陆-陆碰撞造山带拉萨地块南缘,其中东段北部从松多群北界起,发育向北逆推褶皱系,该逆冲褶皱系南缘控制亚贵拉、蒙亚啊、洞中拉、洞中松多、龙马拉等铅锌多金属矿的成矿,即北矿带,成矿元素组合以铅锌多金属为主,成矿时代为40～65Ma;松多群岩带以南,受扇状推覆构造系向南逆冲推覆构造控制甲玛、帮浦、驱龙等铜多金属矿的成矿,即南矿带,成矿元素组合以铜钼多金属为主,成矿时代为13～18Ma。矽卡岩型铅锌矿是北矿带的典型矿床,南矿带主要以斑岩型铜(钼)矿为主,在其周围也发育矽卡岩型铅锌矿床。南带与北带的矽卡岩型铅锌矿床的控矿构造特征具有明显的差异性,本文分别选取南带与北带的典型矿床进行重点研究,剖析南带与北带的构造特征及其对成矿的控制,总结出冈底斯中东段构造控矿模式,为区域找矿指明方向。
Gangdise metallogenic belt locates at continent collisional orogenic belt, south of the Lasa plot, middleeast of the Gangdisc magmatic arc volcanic, with the large deformation structure being ore-controlling structurethat taking thrust nappe discovered everywhere as its feature, and taking Mozhu twist as its axis, formed a nappestructure system pushing to SN. This nappe structure system almost controls Pb-Zn and poIymetallic copperdeposits formation and distribution in middle east of Gangdise metallogenic belt. The north of the belt exists adrape system inversely controlling polymetallic Pb-Zn deposits formation such as Yaguila, Mengyaa, Dongzhongla, Longmala, Dongzhongsongduo and so on. As it is known that these deposits consititutes the northern metallogenicbelt of Gangdise, its Ore-forming elements combination are mainly lead-Zinc,and their forming age are almost 40- 65Ma. The mineralization of the South of Songduo Grop is controlled by south of the nappe structure system, suchas Jiama, Bangpu, Qulong, which called Southern metallogenic belt of Gangdise, that their Ore-forming elements combination are polymetallic copper and molybdenite, with their forming age are nearly 13-18Ma. It is worthmention that skarn lead and zinc deposits grown in this two metallogenic belt have different distinctly ore- controlling structure characteristics, so this paper extracts two typical deposits from different belts and in order toresearch their structure feature and influences on mineralization, and at last summarizes the ore-controlling structure model of the middle east of Gangdise, intends it is useful for prospecting minerals in this area.
出处
《四川有色金属》
2012年第1期42-48,共7页
Sichuan Nonferrous Metals
基金
西藏冈底斯铜金多金属资源评价新技术研究(2006BAB01A04)
西藏冈底斯东段中新生代斑岩成矿系统与找矿预测(编号1212011085529)
念青唐古拉地区成矿条件研究与找矿靶区优选(编号1212010818089)
西藏矿产资源潜力评价(编号1212010813025)
关键词
冈底斯成矿带
南带
北带
矽卡岩型
铅锌矿床
控矿构造
middle east of Gangdise metallogenic belt
south of metallogenic belt
north of metallogenic belt
skarn
lead-zinc deposit
ore-controlling structure
