浙西中生代岩浆岩特征及其与铀矿的关系  

CHARACTERISTICS OF MESOZOIC MAGMATIC ROCKS IN WESTERN ZHEJIANG AND THEIR RELATION WITH URANIUM MINERALIZATION

作　　者：周家志 

机构地区：[1]华东地质局269大队,浙江金华市321028

出　　处：《铀矿地质》2000年第3期143-149,共7页Uranium Geology

摘　　要：本文综合了浙西铀成矿区中生代燕山期中酸性火山岩、次火山岩及基性侵入岩在成岩时间、岩石系列、成岩顺序、岩石成分、控岩因素、成岩环境等方面的特征 ,表明它们分别为壳、幔不同源区的产物。根据不同类型铀矿床与上述岩浆岩的时空关系 ,认为早期 (早白垩世 )铀 赤铁矿型矿石为壳源酸性火山岩浆作用的产物 ,而晚期 (晚白垩世 )沥青铀矿 多金属硫化物、沥青铀矿 紫色萤石型富铀矿石为幔源基性岩浆作用的产物。进而 ,笔者提出了这两种类型铀矿的找矿标志。This paper summarizes characteristics of Mesozoic (Yangshanian Period) acid intermediate volcanics, subvolcanics and basic intrusives from aspects of formation time of rock series, petrogenic sequence, chemical composition, rock controlling factors and petrogenic environments. It is suggested that these rocks were originated from different source areas of crust and mantle. Based on the time space relation between different types uranium deposits and magmatic rocks, the author proposes that: the earlier stage (Earlier Cretaceous) U hematite ores were originated from acid volcanic magmatism of crustal source, but the later stage (Late Cretaceous) pitchblende polymetallic sulfide and pitchblende purple fluorite rich ores were derived from basic magmatism of mantle source. Finally, the author proposes prospecting criteria of the above two types of uranium deposits.

关 键 词：中生代岩浆岩 铀矿床 找矿标志 浙江 

分 类 号：P619.140.8[天文地球—矿床学]