The Bolivian tin province and regional tin distribution in the Central Andes; a reassessment

Lehmann, Bernd; Ishihara, Shunsō; Michel, Hubert; Miller, J. D.; Rapela, Carlos W.; Sánchez, Alberto J.; Tistl, Michael; Winkelmann, Lothar

doi:10.2113/gsecongeo.85.5.1044

Cited by 78 publications

(31 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…B (Taylor and McLennan, 1995). A pelitic (and carbonaceous) source could also explain the more reduced nature of the magmatic‐hydrothermal tin porphyry systems as recorded both by the lack of magmatic magnetite (Lehmann et al. , 1990) and occurrence of early hydrothermal pyrrhotite (Kelly and Turneaure, 1970).…”

Section: Discussionmentioning

confidence: 99%

Boron isotope composition of melt inclusions from porphyry systems of the Central Andes: a reconnaissance study

et al. 2009

Self Cite

View full text Add to dashboard Cite

Quartz-hosted melt inclusions from latite dykes of the Eocene El Salvador copper porphyry system in northern Chile display wide ranges in both boron concentration (15–155 p.p.m. B) and isotope composition (d11B )7 to +12&; n = 10), likely reflecting slab-derived fluid input from seawater-altered oceanic crust. In contrast, the major Miocene tin-silver and tin porphyry systems in the Bolivian back-arc region (Cerro Rico de Potosi, Chorolque, Llallagua) have distinctly different melt inclusion compositions with d11B of )11.4 ± 2.7& (n = 10), and magmatic boron enrichment up to several hundred p.p.m. B. The ‘seawater’ signature in the El Salvador melt inclusions explains the oxidized mineral assemblage of the copper porphyry system, as opposed to the more reduced nature of the Bolivian tin porphyry systems, which reflect intracrustal melting of pelitic rocks

show abstract

Section: Discussionmentioning

confidence: 99%

Boron isotope composition of melt inclusions from porphyry systems of the Central Andes: a reconnaissance study

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…Incipient extension of this old and multiply accreted craton may also have contributed to the formation of roughly coeval gold deposits in the Great Basin, including Carlin (Emsbo et al, 2006). The world's premier tin province in Bolivia and southern Peru is characterized by repeated partial melting of reduced sediments, producing magmas from which Sn(+II) complexes are readily partitioned into fluids for later precipitation as hydrothermal Sn(+IV)O2 (cassiterite; Lehmann et al, 1990) Even along arcs with long-lasting subduction magmatism, the formation of major deposits is typically confined to limited segments and short time periods of a few million years. Structural evidence and plate-scale tectonic reconstructions indicate that segments and periods of successful ore formation are characterized by a compressional state of the crust and lithosphere, favoring the formation of large fractionating magma chambers in the lower crust and preventing volcanic eruption and uncontrolled loss of volatiles in the upper crust (Rohrlach and Loucks, 2005;Sillitoe, 2010).…”

Section: Melt Generation Magma Storage and Ascentmentioning

confidence: 99%

Fluids and Ore Formation in the Earth's Crust

Heinrich

Candela

2014

Treatise on Geochemistry

View full text Add to dashboard Cite

“…The deposits were formed in relation to Cenozoic granitoid activity of the oxidized type (e.g. Ishihara, 1977;Lehmann et al, 1990;Sillitoe, 1991;Sillitoe & Perellò, 2005). The Andes also includes the Bolivian Sn Belt (Fig.…”

Section: Central Andesmentioning

confidence: 99%

“…The Sn deposits were formed in relation to the reduced-type felsic magmatism of partly S-type composition (e.g. Sugaki et al, 1988;Lehmann et al, 1990;Dietrich et al, 2000). Thus, two contrasting metallogenic provinces are located close to each other in the orogen scale.…”

Section: Central Andesmentioning

confidence: 99%

See 1 more Smart Citation

Sedimentary Crust and Metallogeny of Granitoid Affinity: Implications from the Geotectonic Histories of the Circum‐Japan Sea Region, Central Andes and Southeastern Australia

Sato

2012

Resource Geology

View full text Add to dashboard Cite

Metallogeny of granitoid affinity was reviewed from the aspect of geotectonic history of the continental crust, particularly of the genesis of sedimentary crust involved in magmatism. The redox state of granitoids and related mineralization shows a remarkable contrast between the east and west sides of the Pacific Rim, but if examined closely, the reduced-type and oxidized-type granitoid provinces are juxtaposed in three regions: the circum-Japan Sea region, the central Andes, and the Lachlan Fold Belt in southeastern Australia. Comparative study of these regions revealed that the reduced-type magmatism associated with Sn mineralization generated in thick sedimentary crust which formed in three geotectonic environments: (i) accretionary terrane along a subduction zone (e.g. Jurassic East Asia), (ii) continental rift (e.g. Early Paleozoic Andes), and (iii) mega-fan (e.g. Early Paleozoic southeastern Australia). A collisional orogen can provide large amounts of clastic sediment to these environments. The age gap between the magmatism and sedimentation varies depending on the tectonic evolution of individual regions. Thin sedimentary crust may not play an essential role for the reduced-type magmatism. The oxidized-type magmatism associated with porphyry Cu and other mineralization generated in the crust which was initially carbon-free igneous crust or modified from sedimentary crust by magmatism. Subduction-related basaltic magmas are relatively oxidized, and may enhance fO 2 conditions of granitoid activity. Repeated magmatism in a monotonous convergent margin may be favorable for porphyry Cu mineralization as exemplified in the eastern Pacific Rim.

show abstract

The Bolivian tin province and regional tin distribution in the Central Andes; a reassessment

Cited by 78 publications

References 0 publications

Boron isotope composition of melt inclusions from porphyry systems of the Central Andes: a reconnaissance study

Boron isotope composition of melt inclusions from porphyry systems of the Central Andes: a reconnaissance study

Fluids and Ore Formation in the Earth's Crust

Sedimentary Crust and Metallogeny of Granitoid Affinity: Implications from the Geotectonic Histories of the Circum‐Japan Sea Region, Central Andes and Southeastern Australia

Contact Info

Product

Resources

About