摘要
红门岭钼钨矿床是近年来海南岛发现的首例钼钨多金属矿床。该矿床产于印支期花岗斑岩、三叠纪细粒黑云母正长花岗岩及晚白垩世斑状花岗岩内外接触带内,矿体严格受到北北西向断裂破碎带控制。其矿化类型主要为浸染状、星点状、薄饼状、团块状辉钼矿化,缺少典型斑岩型钼矿床的细脉-网脉状辉钼矿化。近矿围岩蚀变主要有钾长石化、黄玉云英岩化、硅化、绢云母化、绿泥石化、高岭土化。红门岭钼钨矿床属中高温岩浆热液矿床,其形成与晚白垩世斑状花岗岩关系密切,而与尖峰岩体三叠纪花岗岩并无直接联系。选取2件石英脉型辉钼矿样品进行Re-Os同位素精确定年,得到的模式年龄分别为(71.9±1.6)Ma和(72.1±0.9)Ma,显示红门岭钼钨矿床成矿时代为晚白垩世。红门岭钼钨矿床、高通岭钼矿床成矿年龄与东南沿海部分钼矿床一致,而明显晚于中国东部主要钼成矿带,表明中国东部早白垩世晚期-晚白垩世存在一期重要的钼成矿事件。
Hongmenling Mo-W deposit currently discovered in Hainan island is the first case of molybdenum and tungsten polymetallic deposit. The deposit is hosted inside and outside the contact zone of Triassic granite porphy- ry, grained biotite syenogranite and late Creataous porphyritic granite. Its orebody is greatly confined with the NNW fracture zones. Its mineralization types include disseminated, star pointed, laminated and agglomerate mo- lybdenite mineralizations,lacking of veinlet and stockwork molybdenite mineralizations. The major wall rock altera- tion types comprise potassic alteration, greisenization, silicification, sericitization, chloritization, argillic alteration etc. The authors consider Hongmenling Mo-W deposit belongs to medium-High temperature magmatic hydrother- mal deposits,and late Creataous porphyritic granite has genetic relationship with the deposit, however, there is no directly relation with Triassic granite porphyry. Two molybdenite-bearing samples of quartz vein mineralizing type were selected for precise Re-Os dating, which yielded model ages of （71.9 ± 1.6） Ma and （72.1 ± 0.9） Ma,indicating that Hongmenling Mo-W deposit was formed in late cretaceous. Hongmenling Mo-W deposit and Gaotongling Mo deposit were formed at the same time with some of Mo deposits along the southeast coast,indicating that there exsited an important molybdenum mineralization event in the period of the late stage of early Cretaceous and late Cretaceous in east China.
出处
《东华理工大学学报（自然科学版）》
CAS
2013年第2期135-142,共8页
Journal of East China University of Technology(Natural Science)
基金
中国科学院广州地球化学研究所项目(Y234141A07)
国土资源部项目(1212010881625)
作者简介
付王伟（1985-），博士生 E-mail：msog090@163.com
通讯作者：许德如（1966-），博士，研究员，主要从事大陆边缘构造与成矿学研究，Email：xuderu@gig．ac．cn
