| 词条 | Cordón de Puntas Negras |
| 释义 |
| name = Cordón de Puntas Negras | photo = Puntas negras volcanic complex chile ii region.jpg | photo_caption = Cordón de Puntas Negras seen from Laguna Miscanti with Cerro Miscanti in the foreground (left). | elevation_m = 5852 | elevation_ref = [1] | prominence = | listing = | location = Chile | range = Andes | coordinates = {{coord|23|44|34|S|67|32|03|W|type:mountain_region:CL|display=inline,title}} | topo = | type = Stratovolcanoes | age = | last_eruption = Unknown | first_ascent = | easiest_route = }} Cordón de Puntas Negras is a {{convert|500|km2|mi2|0|abbr=on}} volcanic chain located east of the Salar de Atacama in Chile's Antofagasta Region. Cordón de Puntas Negras is constructed along the major Calama–Olacapato–El Toro fault[2]{{rp|213}} and is {{convert|70|km}} long.[3] The volcanic chain intersects with the Cordón Chalviri volcanic chain. Both chains cover a surface area of {{convert|500|km2}} and contain cones, vents, lava domes, lava flows and maars,[4] including a lava dome and silicic flow with a surface area of {{convert|13|km2}}.[1] Puntas Negras specifically covers an area of {{convert|400|km2}},[6] which runs from the Chiliques volcano on the north to volcán Puntas Negras ({{convert|5852|m|ft|0|abbr=on}}) almost to the SE. The Puntas Negras Volcano forms the common endpoint of two chains of volcanoes in a V-shaped configuration. The southern leg of the V is called "Cordón Chalviri" whose other extreme is the Cerro Tuyajto, SW of Puntas Negras and at the same distance SE of the Miñiques volcano. Several small volcanic centres and lava flows are found here, including Aguas Calientes, Cerros Cenizas, Chinchilla and Laguna Escondida which have well preserved craters.[1] The volcanic chain is associated with a topographic anomaly in the region, a property that other volcanoes in the area also have.[1] Rocks in the chain are andesite, basaltic andesite and dacite.[1] Magmas from this volcanic chain have a calc-alkaline composition formed by partial melting of a mantle wedge,[2]{{rp|218,225}} with research indicating a decrease in SiO2 concentration over time.[11] In the Tuyajto group, past fumarolic activity has bleached the volcanic rocks in the summit region.[11] The basement beneath the chain is composed from Ordovician marine sediments that were later deformed by the Acadian orogeny.[13] The {{convert|35|x|70|km}} La Pacana caldera is buried beneath Puntas Negras.[1] Both the 3.2 ± 0.3 Patao ignimbrite[2] and the 2.4 ± 0.4 mya Pampa Chamaca or Tuyajto ignimbrite from La Pacana may have been erupted from beneath Puntas Negras.[16][17] the Tuyajto ignimbrite is 530,000 ± 170,000 years old. Biotites in andesitic lavas have been dated 0.7 ± 0.3 to 0.3 ± 0.2 million years ago.[19] Volcan Puntas Negras has generated postglacial lava flows.[3] An olivine basalt flow from the northern part of the chain extends over {{convert|10|km}} towards Salar el Laco and may be of late Holocene age.[11] The youngest volcanic centre appears to be located southeast of Laguna Escondida.[1] A zone of anomalous electrical conductivity down to depths of {{convert|6|km}} extends north to Lascar volcano.[23] Cerro Overo at the southeastern end of Puntas Negras has been undergoing active deformation,[3]{{rp|1369}} with a previously observed pattern of subsidence before 2003–2005 switching to a pattern of inflation. Filling and emptying of a magma reservoir linked to Puntas Negras may be the cause for these deformation patterns.[3]The volcanic chain forms a water divide in the Andes, separating the Puna de Atacama from the basins Laguna Miscanti and Laguna Miniques.[26]{{rp|176}} A catchment area of {{convert|320|km2}} for the Laguna Miscanti lies in the Cordón de Puntas Negras.[27] Puntas Negras has been affected by glaciation during the Pleistocene,[28] with moraines reaching up to {{convert|4400|m}} altitude. Possibly, the entire chain was covered with glaciers.[6] Water from Cordón de Puntas Negras is a principal water source for Laguna Miscanti.[3] See also
References1. ^{{Cite journal|last=Perkins|first=Jonathan P.|last2=Finnegan|first2=Noah J.|last3=Henderson|first3=Scott T.|last4=Rittenour|first4=Tammy M.|date=2016-08-01|title=Topographic constraints on magma accumulation below the actively uplifting Uturuncu and Lazufre volcanic centers in the Central Andes|url=http://geosphere.gsapubs.org/content/12/4/1078|journal=Geosphere|language=en|volume=12|issue=4|pages=1078–1096|doi=10.1130/GES01278.1|issn=1553-040X}} [4][5][6][7][8][9][10][11][12][13][14][15][16]2. ^{{Cite journal|last=Coira|first=B.|last2=Kay|first2=S. Mahlburg|last3=Viramonte|first3=J.|date=1993-08-01|title=Upper Cenozoic Magmatic Evolution of the Argentine Puna—a Model for Changing Subduction Geometry|journal=International Geology Review|volume=35|issue=8|pages=702|doi=10.1080/00206819309465552|issn=0020-6814}} 3. ^{{Cite journal|last=Valero-Garcés|first=Blas L.|last2=Grosjean|first2=Martin|last3=Schwalb|first3=Antje|last4=Geyh|first4=Mebus|last5=Messerli|first5=Bruno|last6=Kelts|first6=Kerry|date=1996-07-01|title=Limnogeology of Laguna Miscanti: evidence for mid to late Holocene moisture changes in the Atacama Altiplano (Northern Chile)|journal=Journal of Paleolimnology|language=en|volume=16|issue=1|pages=4|doi=10.1007/BF00173268|issn=0921-2728}} 4. ^1 {{cite journal|last1=Cabrol|first1=Nathalie A.|last2=Grin|first2=Edmond A.|last3=Chong|first3=Guillermo|author-link3=Guillermo Chong|last4=Minkley|first4=Edwin|last5=Hock|first5=Andrew N.|last6=Yu|first6=Youngseob|last7=Bebout|first7=Leslie|last8=Fleming|first8=Erich|last9=Häder|first9=Donat P.|last10=Demergasso|first10=Cecilia|last11=Gibson|first11=John|last12=Escudero|first12=Lorena|last13=Dorador|first13=Cristina|last14=Lim|first14=Darlene|last15=Woosley|first15=Clayton|last16=Morris|first16=Robert L.|last17=Tambley|first17=Cristian|last18=Gaete|first18=Victor|last19=Galvez|first19=Matthieu E.|last20=Smith|first20=Eric|last21=Uskin-Peate|first21=Ingrid|last22=Salazar|first22=Carlos|last23=Dawidowicz|first23=G.|last24=Majerowicz|first24=J.|title=The High-Lakes Project|journal=Journal of Geophysical Research: Biogeosciences|date=June 2009|volume=114|issue=G2|pages=n/a|doi=10.1029/2008JG000818}} 5. ^1 {{cite book|last1=Niemeyer|first1=Hans F.|title=Hoyas Hydrograficas de Chile: Segunda region|url=http://www.newtenberg.com/cuencas/591/articles-67651_doc_pdf.pdf|accessdate=24 February 2016|language=es}} 6. ^1 {{cite journal|last1=Valero-Garcés|first1=Blas L.|last2=Grosjean|first2=Martin|last3=Kelts|first3=Kerry|last4=Schreier|first4=Hans|last5=Messerli|first5=Bruno|title=Holocene lacustrine deposition in the Atacama Altiplano: facies models, climate and tectonic forcing|journal=Palaeogeography, Palaeoclimatology, Palaeoecology|date=July 1999|volume=151|issue=1–3|page=105|doi=10.1016/S0031-0182(99)00018-8}} 7. ^1 {{cite journal|last1=Gardeweg|first1=Moyra|last2=Ramirez|first2=Carlos F.|title=La Pacana caldera and the Atana Ignimbrite ? a major ash-flow and resurgent caldera complex in the Andes of northern Chile|journal=Bulletin of Volcanology|date=June 1987|volume=49|issue=3|pages=563|doi=10.1007/BF01080449}} 8. ^1 2 {{cite journal|last1=Matteini|first1=M.|last2=Mazzuoli|first2=R.|last3=Omarini|first3=R.|last4=Cas|first4=R.|last5=Maas|first5=R.|title=The geochemical variations of the upper cenozoic volcanism along the Calama–Olacapato–El Toro transversal fault system in central Andes (~24°S): petrogenetic and geodynamic implications|journal=Tectonophysics|date=February 2002|volume=345|issue=1–4|pages=211–227|doi=10.1016/S0040-1951(01)00214-1}} 9. ^1 {{cite web|last1=Naranjo|first1=J.A.|last2=Henríquez|first2=F.|title=Geocronología K-Ar y antecedentes paleoambientales del volcanismo de óxido de fierro de El Laco|url=https://www.researchgate.net/publication/273426262|website=researchgate.net|publisher=XII Congreso Geológico Chileno|accessdate=24 February 2016|language=es}} 10. ^1 {{cite journal|last1=Díaz|first1=Daniel|last2=Brasse|first2=Heinrich|last3=Ticona|first3=Faustino|title=Conductivity distribution beneath Lascar volcano (Northern Chile) and the Puna, inferred from magnetotelluric data|journal=Journal of Volcanology and Geothermal Research|date=March 2012|volume=217–218|page=27|doi=10.1016/j.jvolgeores.2011.12.007}} 11. ^1 {{cite journal|last1=Naranjo|first1=Jose A.|last2=Henrquez|first2=Fernando|last3=Nystrom|first3=Jan O.|title=Metasomatismo de contacto subvolcanico en el Complejo Volcanico El Laco.|journal=Andean Geology|date=19 January 2010|volume=37|issue=1|page=111|doi=10.5027/andgeoV37n1-a05}} 12. ^1 2 {{cite journal|last1=Schröder|first1=Hilmar|title=Kommentar zu den Anmerkungen von Bettina Jenny, Klaus Kammer und Bruno Messerli|journal=Erdkunde|date=September 2001|volume=55|issue=3|pages=288–289|jstor=25647397|language=de|doi=10.3112/erdkunde.2001.03.07}} 13. ^1 {{cite book|title=Stratabound Ore Deposits in the Andes|date=1990|publisher=Springer Berlin Heidelberg|location=Berlin, Heidelberg|isbn=978-3-642-88282-1|page=681|doi=10.1007/978-3-642-88282-1_54|chapter=The el Laco Magnetite Lava Flow Deposits, Northern Chile: An Up-To-Date Review and New Data|last1=Frutos|first1=J.|last2=Oyarzun|first2=J.|last3=Shiga|first3=Y.|last4=Alfaro|first4=G.}} 14. ^1 2 3 {{cite journal|last1=Zeil|first1=Werner|title=Die Verbreitung des jungen Vulkanismus in der Hochkordillere Nordchiles|journal=Geologische Rundschau|date=December 1964|volume=53|issue=2|pages=752–753|doi=10.1007/BF02054561|language=de}} 15. ^1 {{cite journal|last1=de Silva|first1=Shanaka L.|last2=Gosnold|first2=William D.|title=Episodic construction of batholiths: Insights from the spatiotemporal development of an ignimbrite flare-up|journal=Journal of Volcanology and Geothermal Research|date=November 2007|volume=167|issue=1–4|page=325|doi=10.1016/j.jvolgeores.2007.07.015}} 16. ^1 2 3 4 {{cite journal|last1=Henderson|first1=S. T.|last2=Pritchard|first2=M. E.|title=Decadal volcanic deformation in the Central Andes Volcanic Zone revealed by InSAR time series|journal=Geochemistry, Geophysics, Geosystems|date=May 2013|volume=14|issue=5|pages=1358–1374|doi=10.1002/ggge.20074}} 17. ^1 2 3 4 5 6 {{Cite GVP|vn=355101|name=Cordon de Puntas Negras|date=24 February 2016}} [17]}} {{DEFAULTSORT:Cordon de Puntas Negras}} 3 : Volcanoes of Antofagasta Region|Mountains of Chile|Stratovolcanoes of Chile |
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