January 2002
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95 Reads
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29 Citations
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Publications (3)
January 1999
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17 Reads
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57 Citations
December 1997
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104 Reads
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120 Citations
Ore Geology Reviews
Important precious metal deposits have been discovered during the last 10 years in the Deseado Massif region of Patagonia, Argentina. This region is a plateau consisting of Middle to Upper Jurassic volcanic rocks that host fracture-controlled epithermal Au–Ag mineralization. These mineral deposits represent low sulfidation type hydrothermal systems and formed following the main period of volcanism, probably during the Late Jurassic period. The presence of silica sinters and veins interpreted to be feeder structures indicates that the tops of some deposits have been preserved, with erosion of younger sedimentary and volcanic rocks now exposing these systems. These deposits represent diverse erosional levels ranging from sinter formed at the paleosurface, to intermediate Au–Ag-rich quartz veins, to base metal-bearing Au–Ag veins that represent deeper levels of the epithermal systems. The best known deposits are in the Cerro Vanguardia district where vein systems occur over a 350 km2 area and veins can be traced for more than 14 km. Geological mapping of the district has resulted in the definition of over 140 km of veins. Current reserves are over 3.2 million ounces Au equivalent with grades of 10 g/t Au and 120 g/t Ag. The geologic characteristics of the region and the presence of major Au–Ag deposits provide targets for continuing exploration in the Deseado Massif.
Citations (3)
... In this scenario for the Middle Jurassic, an intense extensional tectonics zone originated in the back-arc of the Andean subduction (Pankhurst et al. 1998;Riley et al. 2001), related by fissure volcanism and predominating flows of lava during the Middle-Late Jurassic times. More acid volcanism predominates the Chon Aike Formation (Schalamuk et al. 1997(Schalamuk et al. , 1999Pankhurst et al. 2000;Guido et al. 2002Guido et al. , 2010Riley et al. 2017). This extensional regime led to the separation of the South American and African continents (Pankhurst et al. 2000;Riley et al. 2001). ...
- Citing Article
January 1999
... Mesozoic plutonic rocks are scarce and crop out in Bajo de La Leona (see Section 2.2). Due to their areal extension and economic significance (e.g., Schalamuk et al., 2002), the most important cover rocks are the Jurassic subvolcanic and volcano-sedimentary rocks of the Bajo Pobre Formation and the Bahía Laura Group (Fig. 1b), related to the Chon Aike Silicic LIP (e.g., Pankhurst et al., 1998Pankhurst et al., , 2000Panza and Haller, 2002;Navarrete et al., 2021;Navarrete, 2021). ...
- Citing Article
January 2002
... ± 0.65 Ma;Pankhurst et al. 2000;Riley et al. 2001;Richardson and Underhill 2002;Ruiz González et al. 2022). The volcanic and volcano-sedimentary rocks of the resulting Bahia Laura Volcanic Complex (Echeveste et al. 2001;Guido 2004) include: (1) andesites (Bajo Pobre Formation); (2) calc-alkaline rhyolite, minor andesite, rare dacite, extensive ignimbrites, and tuff layers (Chon Aike Formation); and (3) reworked volcaniclastic sediments in fluviolacustrine settings (La Matilde Formation) (Schalamuk et al. 1997;Marchionni et al. 1999;Echeveste et al. 2001;Guido and Campbell 2009;Guido et al. 2010). The volcanism was accompanied by extensive hydrothermal activity, resulting in low-sulfidation epithermal, precious metal mineralization, including several gold and silver deposits, and at least 23 ancient hot spring occurrences (Schalamuk et al. 1997;Guido and Campbell 2011). ...
- Citing Article
December 1997
Ore Geology Reviews