青海省东昆仑斑岩带新发现

发布时间：2018-03-22 08:09

  本文选题：斑岩带　切入点：斑岩成矿带　出处：《地学前缘》2017年06期 　论文类型：期刊论文

【摘要】：东昆仑地块近年来陆续发现和勘探一些斑岩型矿床,显示斑岩成矿作用的重要性和斑岩型矿床的找矿潜力。笔者在东昆仑新近发现多条斑岩带,它们相互平行,呈NE向产出,规模不等,既可产于两条近EW向主干断裂带之间,又可穿越主干断裂带;既可产于昆南区、昆中区或昆北区,又可跨区产出;主要出露于昆中带和昆北带,又以东昆仑东段都兰地区和西段祁漫塔格地区为主。斑岩体于印支期集中产出,其中印支晚期成矿能力较强。花岗斑岩主要为高钾钙碱性系列,少量为碱性系列。斑岩型矿床氧逸度δFMQ值变化于2~4之间,并普遍属于埃达克质岩,体现较好的成矿远景。斑岩带的形成造就NE向斑岩型成矿带产出,而NE向断裂带即是斑岩成矿构造,故亦可称之为斑岩型构造-岩浆-成矿带。NE向斑岩带的识别与确认,是东昆仑斑岩类地质与成矿研究的新发现,这对区内的构造活动、岩浆作用、地质演化与成矿预测等,均具重要意义。
[Abstract]:Some porphyry deposits have been discovered and explored in the East Kunlun block in recent years, which shows the importance of porphyry mineralization and the prospecting potential of porphyry deposits. Several porphyry belts have recently been discovered in East Kunlun, which are parallel to each other and occur in NE direction. In different scale, it can be produced between two main faults near EW direction and across the main fault zone, and can be produced both in the southern, central and northern regions of Kunming and across regions, and mainly in the middle and north of Kun. In the east of Kunlun, the Dulan area and the western Qimantage area are the main ones. The porphyry is concentrated in Indosinian period, in which the late Indosinian ore-forming ability is stronger. The granitic porphyry is mainly composed of high-potassium calc-alkaline series. A few are alkaline series. The oxygen fugacity 未 FMQ values of porphyry deposits vary from 2 to 4, and generally belong to adakitic rocks, showing a good metallogenic prospect. The formation of porphyry belts leads to the occurrence of NE porphyry metallogenic belts. NE-trending fault zone is porphyry metallogenic structure, so it can be called porphyry tectonic-magmatic metallogenic belt. It is a new discovery of porphyry geology and metallogeny in East Kunlun Mountains. Magmatism, geological evolution and metallogenic prediction are of great significance.
【作者单位】： 中国地质大学(北京)科学研究院;青海省第三地质矿产勘查研究院;青海省地质调查局;
【基金】：国家自然科学基金项目(41730427,41172088) 青海省地质调查局地勘基金项目“青海省东昆仑斑岩成矿规律研究与找矿靶区预测”;青海省地质调查局地勘基金项目“青海省铜矿主要成矿类型选区研究”
【分类号】：P612
，

本文编号：1647805