摘要
以钾、钠含量变化为主要指标获取祁漫塔格地区各个地史时期花岗岩类的成因类型,结果表明,区内构造岩浆作用在时间上具有明显的阶段性,加里东中晚期是本区第一次侵入岩浆作用的高峰期,印支中晚期为本区花岗岩浆作用的鼎盛时期,加里东中晚期和印支中晚期也是区内两次区域成矿作用的大爆发期。岩体分布具有明显的方向性,主要由北东向和北西向两组构造岩浆岩带组成,而且,至少自加里东期以来,两组岩带的空间展布、发育规模、成因类型等诸方面都具有长期此消彼长的变化特点。同时期,两组构造带的碱交代作用类型、成矿作用特点都存在明显的区别,加里东中晚期北东向构造带以钾质交代作用为主,形成了白干湖大型钨锡矿;此时北西向构造带则以钠质交代作用为主,形成以驼路沟钴矿为代表的钴矿系列。此外,同一岩带,花岗岩成因类型不同,其成矿作用特点有别。
The genetic types of granite rocks of various geological periods in the Qimantage region were discriminated by the contents of K and Na. The middle to late Caledonian and middle to late Indosinian are two phases of extensive granitic intrusions, and also massive mineralization in the region. The granitoid rocks occur mainly along NE and NW structural magmatic belts, moreover since Caledonian, the two belts differ in distribution, genetic type, and scale. The alkali metasomatism and mineralization of the two tectonic belts differ at the same period, such as in middle and late Caledonian in the NE structural belt, strong potassic metasomatism led to the formation of the Baigan Lake large-scale tungsten-tin ore deposit, while the sodium metasomatism in the NW-trending structure belt led to the cobalt mineralization as represented by the Tuolugou cobalt ore deposit. Moreover, characteristics of ore mineralization vary with genetic granite types.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2011年第2期232-241,共10页
Geotectonica et Metallogenia
基金
中国地质调查局国土资源大调查研究项目(编号:1212010913015)
