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地质学报  2010 

地壳全元素探测――构建“化学地球”

, PP. 854-864

Keywords: 地壳,元素,穿透性地球化学,地球化学基准网,地球化学走廊带,化学地球

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Abstract:

地壳物质探测是地壳探测工程的重要组成部分。化学元素是地球物质组成的最基本单位,被称为地球的基因。矿产资源是由化学元素组成的,环境是受化学元素行为制约的,因此,对地壳中所有元素精确含量和分布的探测,对解决人类所面临的资源和环境问题具有重大意义。地壳全元素探测项目拟发展4种地球化学探测技术,包括地壳中所有天然元素的精确分析技术,中下地壳物质成分识别技术,穿透性地球化学探测技术,海量地球化学数据和图形显示技术。建立1个覆盖全国的地球化学基准网,系统采集代表性岩石样品10000件,疏松物样品6000件,按标准化的方法分析其主量元素和微量元素含量(包含78种元素),建立中国大陆地球化学基准值,为研究化学元素的分布、演化和成矿物质背景提供基准参考数据。进行总长度3300km的3条地球化学走廊带的实验与示范,采集各类代表性岩石样品5000件,进行元素和同位素测定,构建走廊带地壳地球化学模型、跨越不同大地构造单元的元素空间变化和大型矿集区成矿物质背景。为开展全国地壳探测工程奠定基础,并为最终建立“化学地球”进行技术准备和先导性实验。

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