摘要
位于山东烟台的辽上金矿床为一中型金矿,矿床赋存于新元古代玲珑超单元二长花岗岩与古元古代荆山群的接触带附近,发育矽卡岩化,矿体的产出严格受接触带构造控制。区内出露的中生代岩体为石英二长闪长岩。通过研究每个矿体的宏观产出特征,发现金矿体与石英二长闪长岩有关,区域上部分金矿体赋存于石英二长闪长岩中,而与新元古代玲珑超单元二长花岗岩没有直接关系;通过研究金矿石的微观特征,发现金的沉淀主要发生于石英碳酸盐硫化物阶段,主要矿石类型为石英方解石黄铁矿脉型金矿和黄铁矿化碎裂状二长花岗岩型金矿,前者为富矿石。与典型含金矽卡岩型金矿进行对比表明,辽上金矿床是与石英二长闪长岩有关的矽卡岩型金矿,该矿床与胶东其它金矿成矿背景一致,形成于陆内俯冲中-晚期的拉张环境。
The Liaoshang gold deposit,located in Yantai,eastern Shandong province,is of medium size.Its ore bodies occur in the contact zone between the Neoproterozoic Linglong super-unit granite and the Paleoproterozoic Jingshan Group,where skarn-type minerals were formed and ore bodies were controlled by structure of the contact zone.The exposed quartz monzonitic diorite is the only Mesozoic intrusive rock.In this work,we have studied the characters of each ore body on a macro scale.The result shows that the gold ore body is associated with the quartz monzonitic diorite and not directly related with Neoproterozoic Linglong super-unit granite.By studies of the ore’s micro-characteristics,we find that gold primarily precipitated in the quartz-carbonate-sulfide stage and the main types of ore include quartz-calcite-pyrite vein type and pyritized fragmented monzonitic granite type.The quartz-calcite-pyrite vein type is a rich ore.Comprehensive analysis shows that the Liaoshang gold deposit is a gold-bearing skarn deposit associated with quartz monzonitic diorite and has the same ore-forming geological background as other gold deposits in eastern Shandong,which were formed in the medium-late extension environment caused by intracontinent underthrusting.
出处
《地质与勘探》
CAS
CSCD
北大核心
2011年第2期209-215,共7页
Geology and Exploration
基金
中央地勘基金项目(编号:2007371007)
山东恒邦冶炼股份有限公司资助
关键词
含金矽卡岩型金矿
石英碳酸盐硫化物阶段
辽上金矿
胶东
gold-bearing skarn deposit
quartz-carbonate-sulfide stage
Liaoshang gold deposit
eastern Shandong province
