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| Titel |
Lithospheric-scale structures in New Guinea and their control on the location of gold and copper deposits |
| VerfasserIn |
L. T. White, M. P. Morse, G. S. Lister |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 1 ; Nr. 5, no. 1 (2014-03-31), S.163-179 |
| Datensatznummer |
250115262
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| Publikation (Nr.) |
 copernicus.org/se-5-163-2014.pdf |
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| Zusammenfassung |
| The locations of major gold and copper deposits on the island of New Guinea
are considered by many to be controlled by a series of transfer faults that
strike N–S to NE–SW, perpendicular to the long axis of the island. The
premise is that these faults dilate perpendicular to the regional stress
field, forming conduits for metalliferous gases and fluids to drop
out of solution. However, the data on which this idea was first proposed were
often not presented or, when the data were presented, were of poor quality
or low resolution. We therefore present a review of the existing structural
interpretations and compare these with several recently published
geophysical data sets to determine if the mineralization controlling transfer
faults could be observed. These data were used to produce a new lineament
map of New Guinea. A comparison of the lineaments with the location of major
gold and copper deposits indicates there is a link between the arc-normal
structures and mineralization. However, it is only those deposits that are
less than 4.5 million years old that could be associated with these
structures. Gravity and seismic tomography data indicate that some of these
structures could penetrate deep levels of the lithosphere, providing some
support to the earlier idea that the arc-normal structures act as conduits
for the younger mineral deposits of New Guinea. The gravity data can also be
used to infer the location of igneous intrusions at depth, which could have
brought metal-bearing fluids and gases closer to the Earth's surface. These
regions might be of interest for future exploration campaigns, particularly
those areas that are crosscut by deep, vertical faults. However, new
exploration models are needed to explain the location of the deposits that
are older than 5 Ma. |
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