地球化学调查数据在地质背景、成矿条件分析中的应用：以中国西北干旱荒漠区为例

龚晶晶; 杨剑洲; 胡树起; 马生明

doi:10.3799/dqkx.2019.094

Volume 45 Issue 4

Apr. 2020

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Gong Jingjing, Yang Jianzhou, Hu Shuqi, Ma Shengming, 2020. Application of Geochemical Data in Analysis of Geological Background and Metallogenic Conditions: A Case Study of Northwest China. Earth Science, 45(4): 1388-1402. doi: 10.3799/dqkx.2019.094

Citation:

Gong Jingjing, Yang Jianzhou, Hu Shuqi, Ma Shengming, 2020. Application of Geochemical Data in Analysis of Geological Background and Metallogenic Conditions: A Case Study of Northwest China. Earth Science, 45(4): 1388-1402. doi: 10.3799/dqkx.2019.094

Citation:

Gong Jingjing, Yang Jianzhou, Hu Shuqi, Ma Shengming, 2020. Application of Geochemical Data in Analysis of Geological Background and Metallogenic Conditions: A Case Study of Northwest China. Earth Science, 45(4): 1388-1402. doi: 10.3799/dqkx.2019.094

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Application of Geochemical Data in Analysis of Geological Background and Metallogenic Conditions: A Case Study of Northwest China

doi: 10.3799/dqkx.2019.094

Gong Jingjing^{1, 2
,
,},
Yang Jianzhou^{1, 2},
Hu Shuqi^{1, 2},
Ma Shengming^{1, 2
,
,
,}

1.
Key Laboratory of Geochemical Exploration, Ministry of Natural Resources, Langfang 065000, China
2.
Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

Received Date: 2019-04-22
Publish Date: 2020-04-15

Abstract

Abstract

In most 1:50 000 geological and mineral surveys, geochemical surveys are conducted first and sampling density is higher than 8 samples/km², with up to 38 geochemical indices being analyzed, because the main purpose is to identify "ore causing anomalies" and to facilitate mineral exploration. However, it has been found in previous studies that regional geochemical data directly reflect the chemical composition of surface materials, which contain more extensive geological information than mere anomalies related to mineralization. Based on 1:50 000 geochemical surveys of arid desert landscapes in Northwest China. Geological units in the working area and their geochemical characteristics were studied and identified in this study. Compared to 1:200 000 geological maps, the results of the PC analysis performed on clr-transformed 1:50 000 geochemical data show more details:(1) some geological units could be further divided into multiple sub-units; (2) some intrusive rocks could be divided by phases or lithofacies characteristics; (3) could provide clues for the classification of geological units. The results of this study have been successfully used in the follow-up 1:50 000 geological mapping and verification of the final 1:50 000 geological map. Furthermore, the division of geological units and the identification of geochemical characteristics could provide information for excluding the geochemical anomalies which are irrelevant to mineralization.
- compositional data,
- principal component analysis,
- geological units identification,
- geological mapping,
- Northwest China,
- geochemistry

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References(65)

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