摘要
吾合沙鲁铜矿床位于新疆西南天山乌恰前陆盆地北缘,该盆地内沉积大套中生代—新生代陆相砂体,是该区域铅锌、铜、铀等砂岩型矿床的重要含矿岩系。关于该矿床沉积学方面的研究工作薄弱,长期制约着对区域成矿规律的深入认识及对矿床勘查的有效指导。本文以吾合沙鲁铜矿床含铜岩系新近系中新统安居安组下段碎屑沉积岩为主要研究对象,以沉积学、层序地层学、岩相古地理学和碎屑岩石学理论为指导,系统采集矿区内安居安组下段砂岩粒度分析样品,采用碎屑岩粒度分析测试手段,对沉积物展开细致和深入的研究。结果表明,安居安组沉积相类型与辫状河三角洲相沉积特征一致,在各岩性段内识别出辫状河三角洲平原和辫状河三角洲前缘2种沉积亚相及分流河道砂坝、陆上天然堤、水下分流河道、分流间湾、河口砂坝及远砂坝6种沉积微相。安居安组下段为研究区主要富铜层位,其中水下分流河道微相和分流河道砂坝微相,可作为吾合沙鲁地区铜矿勘查的重点目标。研究成果可为吾合沙鲁铜矿周边及外围资源远景预测提供找矿思路,为区域探寻砂岩型铜矿提供新的借鉴。
The Wuhe Shalu copper deposit is located at the northern margin of the Wuqia foreland basin in the Tianshan Mountains,Southwest Xinjiang.Large sets of Meso-Cenozoic continental sand bodies are deposited in this basin,forming important ore-bearing rock series of lead,zinc,copper,uranium,and other sandstone-type deposits.The lack of sedimentological studies on this deposit has long restricted the understanding of regional metallogeny and hindered mineral exploration.Therefore,this paper uses the Wuhe Shalu copper deposit as a case study,focusing on the clastic sedimentary rocks of the Neogene Miocene Anju'an Formation containing cop-per.This study primarily uses methods from sedimentology,sequence stratigraphy,lithofacies paleogeography,and clastic petrology.Samples for grain-size analysis of the lower member of Anju'an Formation in the mining area were systematically collected.Grain-size analysis and analytical methods of clastic rock were used to con-duct in-depth research on the sediments in the mining area.The results show that the sedimentary facies type of Anju'an Formation is consistent with that of braided river delta.We identified two sedimentary subfacies:brai-ded river delta plain and braided river delta front.In addition,we recognized six sedimentary microfacies in each lithologic segment:distributary channel sand bar,natural embankment on land,underwater distributary channel,interdistributary bay,estuarine sand bar,and far sand bar.The lower part of the Anju'an Formation is the main copper-rich horizon in the study area.The microfacies of the underwater distributary channel and the distributary channel sand bar are key targets for copper exploration in the Wuhe Shalu area.The sudy results provide a prospecting strategy for resource prediction on both sides and the periphery of the Wuhe Shalu copper deposit,and also serve as an important reference for searching for sandstone copper deposits in this area.
作者
柳坤峰
冯昌荣
徐磊
祁晓鹏
蔡振锋
谢晋
翟黎明
雷浩
LIU Kunfeng;FENG Changrong;XU Lei;Qi Xiaopeng;CAI Zhenfeng;XIE Jin;ZHAI Liming;LEI Hao(Sino Shaanxi Nuclear Industry Group Geological Survey Co,Ltd,Xi'an,Shaanxi710100,China;No2 Geological Team,Bureau of Geology and Mineral Resources of Xinjiang,Kashkar,Xinjiang844002,China)
出处
《现代地质》
CAS
CSCD
北大核心
2024年第4期1134-1146,共13页
Geoscience
基金
2013年中央返还两权价款资金项目(T14-1-LQ01)
2016年中央返还两权价款资金项目(T16-2-LQ20)
2017年新疆地质勘查基金招标项目(T17-3-XJ011)。
关键词
砂岩型铜矿
粒度特征
沉积环境
安居安组
吾合沙鲁
乌恰盆地
sandstone-type copper deposit
grain size characteristic
sedimentary environment
Anju'an For-mation
Wuhe Shalu
Wuqia Basin
