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| Titel |
Singular value decomposition (SVD) for extraction of gravity anomaly associated with gold mineralization in Tongshi gold field, Western Shandong Uplifted Block, Eastern China |
| VerfasserIn |
B. B. Zhao, Y. Q. Chen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 18, no. 1 ; Nr. 18, no. 1 (2011-02-15), S.103-109 |
| Datensatznummer |
250013871
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| Publikation (Nr.) |
 copernicus.org/npg-18-103-2011.pdf |
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| Zusammenfassung |
A singular value decomposition (SVD) program on MATLAB platform was
effectively used to handle gravity signals for the Tongshi gold field.
Firstly, the gravity signals were decomposed into different eigenimages with
the help of singular value decomposition method (SVD). Secondly, the
thresholds between the eigenvalues reflecting different layers of
ore-controlling factors were established by multi-fractal method. Finally
images reflecting different layers of ore-controlling factors were rebuilt.
This yielded two layers of two-dimensional singular value images that depict
regional and local ore-controlling factors, respectively.
- 1. The regional ore-controlling factor is a saddle valley with
the gravity anomaly values varying from −55 to 51 μm s−2 on
the NW trending swell with the gravity anomaly values varying from −55 to
567 μm s−2 on the SW side of the Mesozoic volcanic
sedimentary basin with the gravity anomaly values varying from −56 to
−974 μm s−2. 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 favorable 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 s−2 and the ring contact metasomatic mineralization
zone around the Tongshi complex with the positive gravity anomaly varying
from 37 to 345 μm s−2. The skarn and porphyry types of gold
deposits are located within the complex pluton and the Carlin and
cryptobreccia types of gold deposits are located within the contact
metasomatic mineralization zone. Thus both of them are potential areas for
gold deposits.
- 3. The Tongshi gold field exhibits a typical complexity with
multi-layers of ore-controlling factors.
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