摘要
中国东南部中新生代火山-岩浆带中的火山岩型铀矿,主要形成于120—130 Ma和90—100Ma两个时期,与区内白垩纪二次岩浆活动合拍。该期岩浆岩体系,形成于中国东南大陆边缘由挤压转向引张的转折时期,以A型花岗岩和碱性、亚碱性岩石(粗面岩、粗安岩、粗玄岩)、基性岩(碱性玄武岩)的出现为主要特征。此时期也是中国东部多金属,金、银的主要成矿期。铀矿田(床)受切割达幔层的基底断裂控制,火山盆地部位具横向裂谷盆地(早期)和拉张裂谷盆地(晚期)双重特征。在铀矿床成矿物质来源上,强调深部来源的主导作用;在空间展布规律上,存在有规可循的火山岩型铀矿成矿系列;在成矿模式上,强调以深部来源为主导的多模式,包括陆相热水铀矿成矿模式、多重斑岩铀矿成矿模式和上升热柱铀矿成矿模式。按照上述思路,对下一步找矿提出十大建议。
The Volcanic uranium deposit of rock-magma belt-the Mid-Cz Volcano in the Southeast of China mainly formed around 120~130 Ma and 90~100 Ma Which is in harmony with the two rockmagma activities of k within the region. The rock-magma system of this period formed around the turning period from pressure to tension in the continent margin of southeast China, which is mainly characterized by the appearance of A-type granite and alkaline, subalkaline rocks (trachyte, trachyandensite, trachybasalt), basic rock calkaline besalt). This period is also the main mineral-forming period of multi-metals,gold and silver in East China. The uranium deposit is controlled by the base rift of dissection to the mantle, the volcanic basin is of the double characteristics of transversal rift valley basin (early period)and tension rift valley basin (later period). The leading role of the deep source is stressed in terms of mineral-forming material-source of uranium deposits and in terms of space distribution laws, the regular mineral-forming series of volcanic uranium deposits is considered to exist; and also in terms of mineral-forming patterns, the multi-pattern led by the deep-source is stressed, including the mineral-forming pattern of uranium deposit of continental thermos, repeated porphyry mineralforming pattern of uranium deposit and the mineral-forming pattern of uranium deposit of rising polelike thermos. Ten suggestions are put forward to the next mineral-search according to the above thoughts.
出处
《华东地质学院学报》
1992年第1期11-22,共12页
Journal of East China Geological Institute
关键词
铀矿床
控矿构造
火山岩型
成矿
uranium deposits in volcanic rocks
rift structure
rore-forming structure
geological environments
magmatic rocks
mineral-forming series
mineral-forming pattern
southeast of China
