摘要
广宁-罗定断裂带隶属于粤西地区云开加里东褶皱系云开隆起,是广宁-罗定金矿带的控矿断裂带,前人曾把它称为断裂带、断褶带、断裂变质带、推覆构造带.目前,该矿带内已发现金矿床(点)120余处.自1983年以来,发现了河台等一系列大中型金矿,引起了对此矿带基础地质和成矿条件研究工作的重视.从目前的研究看,广宁-罗定金矿带内的一系列金矿床(点)均赋存于广宁-罗定韧性剪切带内,严格受剪切带内强变形糜棱岩-初糜棱岩带控制.河台金矿床、塔岗金矿点均为河台型金矿床,产于含炭细碎屑岩系中的韧性剪切带内.金矿床形成于韧性剪切构造活动的晚期构造扩容阶段,与印支期伍村单元花岗质岩石的侵入有明显的成因联系.通过对金矿带内金矿成矿条件研究及河台金矿典型矿床研究,成功地圈定出塔岗地区为广宁-罗定金矿带内的又一个最具找矿远景的预测靶区.进一步的工程验证,求得F级金矿储量8234kg.
Guangning-Luoding fault belt in Yunkai uplift,Yunkai folding belt of Ca ledonian is a gold deposit-controlling fault belt,where more than 120gold d eposits have been found.The basic geology and minerogenetic conditions of gold deposits have been paid attention since 1983when a series of large gold deposits,such as Hetai gold depositetc.were discovered.The gold deposits are all located in Guangning-Luoding ductile shear zone and distributed stric tly in its mylonite-ultramylonite zones.Hetai and Tagang gold deposits are both t he Hetai-type,of which the gold deposits formed in the dilatancy period of the ductile shear zone,genetically related to Wucun ultra-unit granitic intrusiv e rocks.With studying on the minerogenetic condi tions and model deposit,some favora ble areas are delineated.One of them is Tagang target,from which an F-degree reserves of 8234kg gold is gained.
出处
《地质与资源》
CAS
2002年第2期88-95,共8页
Geology and Resources
基金
国家"八五"重点黄金地质科技攻关项目"广宁-罗定金矿带成矿条件研究及矿床预测"犤编号90051-05(01)-04犦资助.
关键词
成矿条件
预测
剪切带
花岗质岩石
金矿床
找矿方向
Key words:Au deposit belt of Guangning-Luodin g
ductile shear zone
granitic rock
Au deposit
