冀东地区中生代花岗岩、深部过程与金矿  

The Mesozoic granite,deep process and gold deposits in the eastern Hebei region of China

作　　者：赵海玲[1] 邓晋福[1] 许立权[1] 李凯明[1] 狄永军[1] 杨秋利 

机构地区：[1]中国地质大学,北京100083 [2]峪耳崖金矿,河北067601

出　　处：《桂林工学院学报》2001年第1期20-26,共7页Journal of Guilin University of Technology

基　　金：国家科委"95"攀登专项! (95 -专 - 0 4) ;国土资源部重点科技项目;国家自然科学基金! (4 95 72 10 4)资助

摘　　要：冀东是中国东部重要的金矿富集区之一 ,是滨太平洋地区构造 -岩浆及成矿作用的重要组成部分。在马兰峪背斜的北翼及其核部形成了一条近NE向的金矿带。按其寄主岩特征主要分为 3种类型 ,从深层至浅层分别是 :( 1 )产于基底──太古宙变质岩中的金厂峪式金矿 ;( 2 )产于中生代花岗岩中及其接触带中的峪耳崖式金矿 ;( 3)产于盖层──元古宙长城系和蓟县系灰岩中的冷口式 (或万庄式 )金矿。这 3种金矿的寄主岩石虽然不同 ,但却有许多相似之处。这些金矿均形成于中生代 ,空间上与燕山期花岗岩密切相关 ,矿化特征非常相似。硫同位素和铅同位素成分显示 ,金来源于地幔和下地壳 ,与中生代的岩浆作用有关。金矿在不同地质体中的分布受断裂带的控制 ,此外 ,万庄金矿还受喀斯特古溶洞的控制。氢氧同位素资料表明 ,该地区的成矿流体来源于大气水和岩浆水。该地区的金矿被认为是壳幔物质交换的产物 ,并且是多阶段金矿化的结果。最后 ,建立了冀东地区的金矿成矿模式。The eastern Hebei region of China is one of the major concentrating areas of gold mineralization in eastern China,which is an important part of the Circum-Pacific magma-tectonic and metalogenic belt. These deposits are located as a NE-trending zone in the Malanyu anticline. There are three types of gold deposits in terms of the characteristics of host rocks.Jingchangyu-type gold deposit is situated in the Archean metamorphic basement,which mainly consists of plagioclase amphibolite.Yuerya-type gold deposit occurs within the Yanshanian granite and its contact zone with Mesoproterozoic dolomitite. Lengkou(or Wanzhuang)-type gold deposit is located within the covering strata of the Mesoproterozoic dolomitite.The host rocks of these 3 types of gold deposits are very different in host rock type, however,they are very similar in many respects.These deposits were formed in Mesozoic and their spatial distribution is closely related to Yanshanian granite, which shows the orogenic nature.The mineralization characteristics of these gold deposits are very similar. The characteristics of sulfur isotopic and lead isotopic composition show that the gold deposits in this area are derived from the mantle and deep crust and are related to Mesozoic magmatism. The distribution of the gold deposits in differet geological bodies has been controlled by fracture zone,besides,the Wanzhuang gold deposit is controlled also by Paleokarst cave.Hydrogen and oxygen isotopic data show that the ore-bearing fluid in this area is derived from both the atmosphere water and magmtic water.The gold deposits in this area have been believed to be the products of crust-mantle exchange and resulted from multistage gold mineralization.Finally,a mineralization model of gold deposits in eastern Hebei of China has been set up.

关 键 词：深部作用 金矿床 花岗岩 燕山期 成矿模式 河北 中生代 成矿作用 

分 类 号：P618.51[天文地球—矿床学]