特殊地质地貌区填图物化探技术应用

喻劲松; 荆磊; 王乔林; 韩伟; 刘华忠; 郜晓亮

特殊地质地貌区填图物化探技术应用

中国地质科学院地球物理地球化学勘查研究所, 河北廊坊 065000

基金项目:

中国地质调查局地质调查项目“特殊地质地貌区填图试点” DD20160060

详细信息

作者简介:
喻劲松(1968-), 男, 教授级高级工程师, 博士, 从事物化探综合研究。E-mail:yujinsong@igge.cn

中图分类号: P623
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- 文章访问数: 165
- HTML全文浏览量: 83
- PDF下载量: 12
- 被引次数: 0
出版历程
- 收稿日期: 2016-09-16
- 刊出日期: 2016-12-01

APPLICATION OF GEOPHYSICAL AND GEOCHEMICAL PROSPECTING TECHNIQUES IN SPECIAL GEOLOGICAL AND GEOMORPHIC AREAS

Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, Hebei, China

摘要

摘要: 基于物化探技术方法在特殊地质地貌区填图中的应用实验，介绍从区域物化探数据提取地质填图信息的方法，指出重磁与氡-汞气测联合应用是覆盖区探测隐伏岩体、断裂的高效低成本物化探技术组合。运用基于地球化学理论方法的元素地球化学判别技术，在强烈风化区定量划分风化等级为:基岩-弱风化-中度风化-强风化-全风化-残积土等；指出风化壳元素地球化学行为对原生矿物分解、次生矿物形成具有示踪效应；不同风化层稀土元素富集分异显著，强烈富集于全风化层（岩土界面或风化岩石顶界）中的稀土元素分布模式，可作为界定风化壳分层的重要地球化学判别指标。
- 地质填图 /
- 物化探技术 /
- 元素地球化学 /
- 判别 /
- 应用
Abstract: Based on the application experiment of geophysical and geochemical prospecting technique in special geological and geomorphic areas mapping, this paper introduces the methods of extracting geologic information from regional geophysical and geochemical data. It is pointed out that the combination of gravity and Rn-Hg survey is efficient and low-cost for detecting concealed rock and fault in coverage areas. The weathering grades of intensely weathered areas can be clarified into bedrock, weak weathering, moderate weathering, strong weathering, total weathering, residual soil, and so on. Besides that, the geochemical behavior of weathered crust has a trace effect on the decomposition of primary minerals and the formation of secondary minerals. Due to the significant differentiation of REE in different weathered layers, the distribution pattern of REE which are strongly enriched in the whole weathering layer (rock-soil interface or weathering rock top) can be used as an important geochemical identification index for delimiting weathering crust.
- geological mapping /
- geophysical and geochemical exploration technique /
- element geochemistry /
- discrimination /
- application

HTML全文

图 1 区域物化探数据推断构造岩体分布图

Figure 1. Structure and rock mass distributions inferred from regional geophysical and geochemical data

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图 2 内蒙试点填图区重磁和氡-汞气测联合剖面测量结果

Figure 2. Combination of gravity-magnetic and Rn-Hg gas survey results in the pilot mapping area, Inner Mongolia

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图 3 那蓬岩体14D029、D2200剖面风化指数CIA-WIP-WIC灵敏性对比

Figure 3. Sensitivity comparison of weathering index CIA-WIP-WIC from 14D029 and D2200 sections in Nampong rock mass

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图 4 那蓬岩体风化剖面样品CIA指数变化分布

Figure 4. Distribution of CIA index from weathering section of Nampong rock mass

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图 5 那蓬岩体D2200风化剖面元素迁移分布

含量：Ag,Hg,Cd为ng/g,Zn,Bi,Sb,Ba,Be为μg/g,主量元素为%；WIC-风化指数

Figure 5. Distribution of elemental transportation in the weathered section D2200 of Nampong rock mass

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图 6 那蓬岩体风化强度与厚度变化关系图

Figure 6. The relationship between the weathering intensity and the thickness of Nampong rock mass

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图 7 D2200剖面不同风化层稀土元素球粒陨石与上陆壳标准化分布模式

基岩数据引自严成文等^[46], 球粒陨石数据引自Masuda等^[51], 上陆壳数据引自Taylor等^[52]

Figure 7. REE distribution pattern after chondrites and upper continental crust normalized of different weathered layers in section D2200

下载: 全尺寸图片幻灯片

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