中国浅表地球化学场基本特征  

Basic Characteristics of Surficial Geochemical Fields in China

作　　者：任天祥[1] 汪明启[2] 

机构地区：[1]中国地质科学院物化探研究所,河北廊坊065000 [2]中国地质大学,北京100083

出　　处：《矿床地质》2004年第S1期41-53,共13页Mineral Deposits

基　　金：中国地质调查局综合研究项目"中国成矿体系与区域成矿评价"(K.14)资助

摘　　要：在中国浅表地球化学场中,亲核亲地幔的铁族元素在古中华陆块群中比较富集,呈高背景场或异常场分布;亲壳的Si和K在造山带中比较富集。依据上述元素的高、低背景场和异常场分布特征,可以大致划定陆块或地台与造山带的边界以及主要缝合带、深大断裂带的位置。Cu、Pb、Au、W、Sn、Ag、Zn、Mo、Cr、Ni等成矿元素的分布与中国大陆地壳演化中构造-岩浆-成矿活动密切相关,其异常场大多集中在陆块和造山带的边缘及各类深大断裂中。根据异常场规模和成因,划分出许多地球化学域、地球化学省和异常区带。其中,在中央造山带以南分布的Cu、Pb、W、Sn等元素的巨大地球化学域或省最引人注目。依据20余个元素浅表地球化学场特征,暂将中国划分为2个一级地球化学区和13个二级地球化学区。In surficial geochemical fields of China,nucleophile and mantlephile iron group elements are concentrated in paleo-Sino landmass groups and show distribution of high background or anomalous fields, whereas crustphile Si and K are comparatively concentrated in orogenic belts. Based on the distribution of high and low background fields as well as anomalous geochemical fields,we can roughly determine the boundaries of landmasses, platforms and orogenic belts, and indicate positions of the main suture zones and major deep faults. The distribution of such ore-forming elements as Cu, Pb, Au, W, Sn , Ag, Zn, Mo, Cr and Ni is closely related to faults, magmatism and ore-forming activities, and most anomalous fields of these elements are concentrated on the edges of landmasses, orogenic belts or major deep faults. According to sizes and origins of the anomalies, several geochemical domains, provinces and zones can be distinguished, among which the giant Cu, Pb, W, Sn domains or provinces are extremely remarkable. On the basis of the surficial geochemical features of more than 20 elements,China can be tentatively divided into two first-grade geochemical areas and thirteen second-grade geochemical areas.

关 键 词：地球化学场 地球化学分区 

分 类 号：P59[天文地球—地球化学]