机构地区：[1]甘肃省地矿局,甘肃兰州730002 [2]甘肃省地矿科技信息中心,甘肃兰州730000 [3]甘肃省地质调查院,甘肃兰州730000
出 处：《甘肃地质》2015年第4期1-15,共15页Gansu Geology
基 金：中国地质调查局中国矿产地质与区域成矿规律综合研究项目"甘肃省矿产资源调查成果综合集成与服务产品开发(编号:12120114058501)子项目资助"
摘 要：张新虎等人在区域成矿地质背景研究过程中,根据甘肃省区域化探新成果,结合地球化学块体研究,对地球化学场特征进行梳理,认为地球化学场是地壳浅表不同地质体、各种地质—地球化学作用演化过程的反映。本文数据来源于全省1∶20万区域化探扫面成果资料,主要采样介质为水系沉积物,定量分析39种元素和氧化物。文章介绍了甘肃省6大地理地球化学景观区特征,在总结甘肃省区域地球化学场特征时指出:地球化学景观条件对元素分布、迁移、富集产生影响,不同元素组合空间分布受不同构造层次、地质建造单元控制,反映出区域构造演化特征和成岩、成矿物质成分的差异。其中北山地区处于干旱荒漠景观区,多数元素背景值偏低,与全国平均值相比明显偏低的元素(化合物)有As、Ag、B、Cr、Ni、Co、V、Fe2O3、Mn、P、Cu、Zn等,近乎是全国平均值的一半,Ba、Sr、Ca O、K_2O、Na_2O、SiO_2相对富集,这与该景观区强蒸发、碱性环境和钙质积结有关,其中Sr高出全国均值近2倍。祁连山地区与全国相比As、Au、Ba、Cr、Ni、Co、Cu、Fe_2O_3、Sb明显高出,反映出铜、多金属成矿带的基本地球化学特点。在总结元素空间分布特征和统计分析基础上,划出地球化学域2个、地球化学省7个、地球化学带20个。区域地球化学场研究在地质找矿中居战略地位,地球化学分区对矿产资源勘查、异常查证具有宏观指导意义。甘肃省已完成区域化探扫面面积36.4万km^2,综合异常查证率达到65%,通过化探异常查证及后续地质工作发现各类矿产地230个,发现和评价了一批新矿产地,其潜在经济价值巨大。特别是化探找金取得丰硕成果,为甘肃省金矿勘查、开发奠定了坚实基础,作出了重要贡献,化探异常查证目前仍是方便、快捷、经济、有效的勘查技术方法。Based on new resu lts of regional geochemical exploration in Gansu Province and the study of geochemical blocks, Zhang et al. study the characteristics of geochemical field in the research of regional metallogenesis and geological setting. This article suggested the geochemical field is meaning to the reflection of developing of geological and geochemical process, and kinds of geological body in the shallow crust. The data originate from the materials of 1∶200 000 regional geochemical exploration, which tested 39 kinds of element and oxide. The article introduced the characteristics of 6 geochemical landscapes and geochemical field in Gansu Province, as follows： the distribution, removal and enrichment of elements were influenced by geochemical landscape, the spatial distribution of various element associations were controlled by tectonic and geological units,and both reflected the difference of regionally tectonic developing and components of different rocks and minerals.In Beishan area, with arid desert landscape, the background values of most elements are lower compared with national average value. The values of As, Ag, B, Cr, Ni, Co, V, Fe2O3, Mn, P, Cu and Zn are nearly half of national average value, however, the enrichment of Ba, Sr, Ca O, K2 O, Na2 O and Si O2, especially Sr（200% of national average value）, is related with factors of strongly evaporation, basic environment and calcareous deposition. In Qilian area, the values of As, Au, Ba, Cr, Ni, Co, Cu, Fe2O3 and Sb are apparent higher, reflecting the geochemical characteristics of copper and polymetallic metallogenesis. This study also defined 2 geochemical domains, 7 geochemical provinces, 20 geochemical zones. The studying of geochemical field plays a strategic stat us, but also the geochemical partition is significant to follow-up of anomaly and exploration of mineral resources.The completed area of regional geochemical exploration is 364 000 km2, the percentage of integrated follow-up of anomaly is up to 65%. 230 orefields were found and l
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