应用奇异值分解(SVD)技术提取鲁西铜石金矿田致矿重力异常

赵彬彬; 陈永清

doi:10.3799/dqkx.2011.036

Volume 36 Issue 2

Mar. 2011

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Article Navigation > Earth Science > 2011 > 36(2): 341-346

ZHAO Bin-bin, CHEN Yong-qing, 2011. Singular-Value Decomposition (SVD) for Extraction of Gravity Anomaly Associated with Gold Mineralization in the Tongshi Gold Orefield, Western Shandong Province, East China. Earth Science, 36(2): 341-346. doi: 10.3799/dqkx.2011.036

Citation:

ZHAO Bin-bin, CHEN Yong-qing, 2011. Singular-Value Decomposition (SVD) for Extraction of Gravity Anomaly Associated with Gold Mineralization in the Tongshi Gold Orefield, Western Shandong Province, East China. Earth Science, 36(2): 341-346. doi: 10.3799/dqkx.2011.036

Citation:

ZHAO Bin-bin, CHEN Yong-qing, 2011. Singular-Value Decomposition (SVD) for Extraction of Gravity Anomaly Associated with Gold Mineralization in the Tongshi Gold Orefield, Western Shandong Province, East China. Earth Science, 36(2): 341-346. doi: 10.3799/dqkx.2011.036

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Singular-Value Decomposition (SVD) for Extraction of Gravity Anomaly Associated with Gold Mineralization in the Tongshi Gold Orefield, Western Shandong Province, East China

doi: 10.3799/dqkx.2011.036

School of the Earth Sciences & Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2010-05-12
Available Online: 2021-11-10
Publish Date: 2011-03-01

Abstract

Abstract

A singular-value decomposition (SVD) program on a MATLAB platform was effectively used to handle gravity signals for the Tongshi gold field. Firstly. The gravity signals are firstly decomposed into different eigenimages with singular-value decomposition method. Secondly, the thresholds between the eigenvalues reflecting different layers of ore-controlling factors are established by multi-fractal method. Finally the eigenvalues with different layers of ore-controlling factors were rebuilt on certain mathematical rules. This yielded three layers of two-dimensional singular-value images that meticulously depict ore-controlling factors in different scales respectively. (1) The regional ore-controlling factor is a saddle valley with the gravity anomaly values varying from -55 to 51 μm/s² of the NW trending swell with the gravity anomaly values varying from -55 to 567 μm/s² on the SW side of the Mesozoic volcanic sedimentary basin with the gravity anomaly values varying from -56 to -974 μm/s². The saddle valley might be tectonically an extensional area where the Tongshi complex pluton and all gold deposits are located and thus this area is a favorable area for gold deposits. (2) The local ore-controlling factor is the Tongshi complex pluton with a negative circular gravity anomaly varying from -339 to -11 μm/s² and the ring contact metasomatic mineralization zone around the Tongshi complex with the positive gravity anomaly varying from 37 to 345 μm/s². The porphyry gold occurrences are located within the Tongshi intrusive complex and Skarn iron-copper-gold occurrences are located in the inner contact metasomatic zone between the intrusive complex and its host rocks. Crypto-breccia and Carlin-type gold deposits are located at the outer contact metasomatic zone between the intrusive complex and its host rocks. Thus the two areas are potential areas for gold deposits. (3) The concrete ore-controlling factor is crossing areas between the NE trending faults and NW trending faults reflected by the two trending gravity anomaly zones. Almost all gold deposits are located within crossing areas and thus these areas are prospective areas for gold deposits. (4) The Tongshi gold field has a typical complexity with multi-layers of ore-controlling factors.
- singular-value decomposition,
- multi-fractal,
- gravity anomalies,
- gold mineralization,
- ore-controlling factors,
- Tongshi gold orefield,
- East China

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References(29)

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Singular-Value Decomposition (SVD) for Extraction of Gravity Anomaly Associated with Gold Mineralization in the Tongshi Gold Orefield, Western Shandong Province, East China

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