Tectonic trigger for the formation of late Miocene Cu-rich breccia pipes in the Andes of central Chile

Skewes, M. Alexandra; Stern, Charles R.

doi:10.1130/0091-7613(1994)022<0551:ttftfo>2.3.co;2

Cited by 58 publications

(35 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since Thiéblemont et al (1997) and Sajona and Maury (1998) reported that epithermal and porphyry Cu-Au deposits are closely associated with Cenozoic adakites in the Philippines arc, numerous subsequent other workers have reported Cu-Au-Mo deposits associated with adakitic rocks in various parts of the world (e.g., Chile, Mexico, Ecuador, China and southwestern United States), although in some cases the origin of the adakitic signature has been strongly debated (McInnes and Cameron, 1994;Skewes and Stern, 1994 (Macpherson et al, 2006); LPFC, low-pressure fractional crystallization involving olivine + clinopyroxene + plagioclase + hornblende + titanomagnetite (Castillo et al, 1999). Reich et al, 2003;Cooke et al, 2005;Wang et al, 2006aWang et al, ,b, 2007cRichards and Kerrich, 2007;Chiaradia et al, 2009;Liu et al, 2010a,b;Sun et al, 2010;Tang et al, 2010).…”

Section: Implications For Cu-au Mineralizationmentioning

confidence: 99%

“…Reich et al, 2003;Cooke et al, 2005;Wang et al, 2006aWang et al, ,b, 2007cRichards and Kerrich, 2007;Chiaradia et al, 2009;Liu et al, 2010a,b;Sun et al, 2010;Tang et al, 2010). The three largest super-giant porphyry Cu-Au deposits in the world, i.e., the E1 Teniente, Chuquicamata and Río Blanco-Los Bronces deposits, all occur in the central Andes arc and are considered by many workers to have been related to the adakites derived by partial melting of subducted oceanic crust (Skewes and Stern, 1994;Oyarzun et al, 2001;Reich et al, 2003;Cooke et al, 2005). Subduction zones have been considered as uniquely favorable tectonic settings for the generation of Cu-Au deposits (Oyarzun et al, 2001;Defant et al, 2002;Reich et al, 2003).…”

Section: Implications For Cu-au Mineralizationmentioning

confidence: 99%

“…Most known porphyry/hydrothermal Cu-Au deposits in the world occur in subduction zones or arc settings (Sajona et al, 1993;Skewes and Stern, 1994;Akira, 2002;González-Partida et al, 2003;Reich et al, 2003;Cooke et al, 2005;Richards and Kerrich, 2007;Sun et al, 2010;Tang et al, 2010). These include super-giant porphyry CuAu deposits such as the E1 Teniente, Chuquicamata and Río Blanco-Los Bronces deposits in the Andes arc related to the subduction of oceanic crust or ridges (Skewes and Stern, 1994;Oyarzun et al, 2001;Reich et al, 2003;Cooke et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Late Cretaceous (ca. 90Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu–Au mineralization

Jiang

Wang

et al. 2012

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

Section: Implications For Cu-au Mineralizationmentioning

confidence: 99%

Section: Implications For Cu-au Mineralizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Late Cretaceous (ca. 90Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu–Au mineralization

Jiang

Wang

et al. 2012

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

“…1) were formed in this Andean segment during the late Miocene to early Pliocene (Deckart et al, , 2006Maksaev et al, 2004;Cannell et al, 2005) and were rapidly unroofed (Skewes and Holmgren, 1993;Serrano et al, 1996). Their origin has been attributed to crustal thickening, uplift and erosion that accelerated crystallization and devolatilization of crustal magma chambers above which the giant Cu-Mo deposits were formed (Skewes and Stern, 1994;Stern and Skewes, 2005). Thus, understanding the Neogene exhumation history of the Principal Andean Cordillera of central Chile has implications for both the tectonic and metallogenic evolution of this segment of the Andean orogen.…”

Section: Introductionmentioning

confidence: 99%

Fission track thermochronology of Neogene plutons in the Principal Andean Cordillera of central Chile (33-35°S): Implications for tectonic evolution and porphyry Cu-Mo mineralization

Maksaev

Munizaga

Zentilli

et al. 2009

AndGeo

View full text Add to dashboard Cite

AbStRACt. Apatite fission track data for Miocene plutons of the western slope of the Principal Andean Cordillera in central Chile (33-35°S) define a distinct episode of enhanced crustal cooling through the temperature range of the apatite partial annealing zone (~125-60°C) from about 6 to 3 Ma. This cooling episode is compatible with accelerated exhumation of the plutons at the time of Pliocene compressive tectonism, and mass wasting on the western slope of the Principal Andean Cordillera in central Chile. The timing coincides with the southward migration of the subducting Juan Fernández Ridge and the development of progressive subduction flattening northward of 33°S. It also corresponds to the time of active magmatic-hydrothermal processes and rapid unroofing of the world class Río Blanco-Los Bronces and El Teniente porphyry Cu-Mo deposits. Zircon fission track ages coincide with previous 40 Ar/ 39 Ar dates of the intrusions, and with some of the apatite fission track ages, being coherent with igneous-linked, rapid cooling following magmatic intrusion. The thermochronologic data are consistent with a maximum of about 8 km for Neogene exhumation of the plutons.

show abstract

“…Its emplacement occurred during or immediately after uplift of the crystalline basement (i.e., 8.0-7.8 Ma), which in part is constrained by apatite fission-track cooling ages of adjacent Sierras Pampeanas (e.g., 7.6±2.2 Ma; Coughlin et al 1998;Coughlin and Holcombe 2002). Skewes and Stern (1994) have proposed that similar breccias in the Frontal Cordillera are the result of a major uplift event that brought large water-saturated magma bodies to shallow depths, resulting in the explosive release of magmatic fluids. However, in the Farallo' n Negro district, the sedimentary succession was wet at the time of volcanism, as evident from the abundance of peperitic intrusions.…”

Section: El Espanto and Equivalent Rhyolitic Diatremesmentioning

confidence: 99%

ELA-ICP-MS U?Pb zircon geochronology of regional volcanism hosting the Bajo de la Alumbrera Cu?Au deposit: implications for porphyry-related mineralization

Harris

Allen

Bryan

et al. 2004

Mineralium Deposita

View full text Add to dashboard Cite

ELA-ICP-MS U-Pb zircon geochronology has been used to show that the porphyritic intrusions related to the formation of the Bajo de la Alumbrera porphyry Cu-Au deposit, NW Argentina, are cogenetic with stratigraphically well-constrained volcanic and volcaniclastic rocks of the Late Miocene Faralloń Negro Volcanic Complex. Zircon geochronology for intrusions in this deposit and the host volcanic sequence show that multiple mineralized porphyries were emplaced in a volcanic complex that developed over 1.5 million years. Volcanism occurred in a multivent volcanic complex in a siliciclastic intermontane basin. The complex evolved from early mafic-intermediate effusive phases to a later silicic explosive phase associated with mafic intrusions. Zircons from the basal mafic-intermediate lavas have ages that range from 8.46±0.14 to 7.94±0.27 Ma. Regionally extensive silicic explosive volcanism occurred at r8.0 Ma (8.05±0.13 and 7.96±0.11 Ma), which is co-temporal with intrusion of the earliest mineralized porphyries at Bajo de la Alumbrera (8.02±0.14 and 7.98±0.14 Ma). Regional uplift and erosion followed during which the magmatic-hydrothermal system was probably unroofed. Shortly thereafter, dacitic lava domes were extruded (7.95±0.17 Ma) and rhyolitic diatremes (7.79±0.13 Ma) deposited thick tuff blankets across the region. Emplacement of large intermediate composition stocks occurred at 7.37±0.22 Ma, shortly before renewed magmatism occurred at Bajo de la Alumbrera (7.10±0.07 Ma). The latest porphyry intrusive event is temporally associated with new orebearing magmatic-hydrothermal fluids. Other dacitic intrusions are associated with subeconomic deposits that formed synchronously with the mineralized porphyries at Bajo de la Alumbrera. However, their emplacement continued (from 7.10± 0.06 to 6.93±0.07 Ma) after the final intrusion at Bajo de al Alumbrera. Regional volcanism had ceased by 6.8 Ma (6.92±0.07 Ma).The brief history of the volcanic complex hosting the Bajo de la Alumbrera Cu-Au deposit differs from that For example, at the El Salvador porphyry copper district in Chile, magmatism related to Cu mineralization was episodic in regional igneous activity that occurred over tens of millions of years. Bajo de la Alumbrera resulted from the superposition of multiple porphyryrelated hydrothermal systems, temporally separated by a million years. It appears that the metal budget in porphyry ore deposits is not simply a function of their longevity and/or the superposition of multiple porphyry systems. Nor is it a function of the duration of the associated cycle of magmatism. Instead, the timing of processes operating in the parental magma body is the controlling factor in the formation of a fertile porphyryrelated ore system.

show abstract

Tectonic trigger for the formation of late Miocene Cu-rich breccia pipes in the Andes of central Chile

Cited by 58 publications

References 0 publications

Late Cretaceous (ca. 90Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu–Au mineralization

Late Cretaceous (ca. 90Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu–Au mineralization

Fission track thermochronology of Neogene plutons in the Principal Andean Cordillera of central Chile (33-35°S): Implications for tectonic evolution and porphyry Cu-Mo mineralization

ELA-ICP-MS U?Pb zircon geochronology of regional volcanism hosting the Bajo de la Alumbrera Cu?Au deposit: implications for porphyry-related mineralization

Contact Info

Product

Resources

About