| 词条 | Chon Aike Formation |
| 释义 |
| name = Chon Aike Formation | image = | caption = | type = Geological formation | period = Tithonian | age = Mid Jurassic-Berriasian ~{{fossil range|170|140}} | prilithology = Rhyolites, ignimbrites, lavas | otherlithology = Agglomerates, tuffs | namedfor = Cerro Chon Aike | namedby = | location = Patagonia | region = Santa Cruz Province | country = {{flag|Argentina}} | coordinates = {{coord|47.7|S|70.3|W|display=inline}} | paleocoordinates = {{coord|44.6|S|29.5|W|display=inline}} | unitof = Bahía Laura Group | subunits = | underlies = La Matilde & Pampa Rincón Formations | overlies = Tobífera Formation | thickness = | extent = Deseado Massif & Austral Basin | area = ~{{convert|100000|km2|abbr=on}} | map = Geologic Structures of Patagonia.png | map_caption = Map of the Deseado Massif where the formation outcrops }} The Chon Aike Formation is an extensive geological formation, present in the Deseado Massif in north-central Santa Cruz Province, Patagonia, Argentina. It covers an area of approximately {{convert|100000|km2}} and consists of rhyolitic volcanic rocks, particularly ignimbrites and lavas, with smaller amounts of agglomerates and tuffs.[1] Within dacitic rocks, plant fossils have been found.[2] DescriptionThe Chon Aike Formation forms part of the Chon Aike Province, also known as the Tobífera Series, a large igneous province that covers {{convert|1700000|km2|sqmi}}.[3] The northern part of the formation, Río Pinturas, has been dated to the Late Jurassic (140–160 {{Abbr|Ma|Million years ago}}), while the western and eastern sections have been dated to 162 ± 11 Ma and 168 ± 2 Ma respectively, indicating Middle Jurassic eruptions. Fossil flora, however, suggests a Middle to Late Jurassic age. (See La Matilde Formation.)[4] During the break-up of Gondwana around 180–165 Ma, the opening of the Weddell Sea lead to extension along the western margin of the South American Plate, resulting in intra-plate volcanism in the Chon Aike area and rifting in the Magallanes Basin.[5] The Chon Aike volcanism was probably related to the subduction of the Pacific Phoenix and Farallon plates.[6] References{{portal|Argentina|Geology|Jurassic|Prehistory of South America}}1. ^{{Harvnb|Channing|Zamuner|Zúñiga|2007|loc=Regional geological setting, pp. 401–402}} 2. ^Estancia Bajo Pellegrini at Fossilworks.org 3. ^{{Harvnb|Sruoga|Rubinstein|Hinterwimmer|2004|loc=Geological setting, pp. 32–33}} 4. ^{{Harvnb|Pankhurst|Leat|Sruoga|Rapela|1998|loc=Chon Aike Formation, pp. 118–119}} 5. ^{{Harvnb|Franzese|Spalletti|Pérez|Macdonald|2003|loc=Abstract}} 6. ^{{Harvnb|Torsvik|Rousse|Labails|Smethurst|2009|loc=6.1 Jurassic reconstructions (180 and 150 Ma), p. 1325}} Bibliography{{Refbegin}}
| last1 = Channing | first1 = A. | last2 = Zamuner | first2 = A. B. | last3 = Zúñiga | first3 = A. | title = A new Middle–Late Jurassic flora and hot spring chert deposit from the Deseado Massif, Santa Cruz province, Argentina | year = 2007 | journal = Geological Magazine | volume = 144 | issue = 2 | pages = 401-411 | url = http://orca.cf.ac.uk/16336/1/Channing%202007.pdf | access-date = 13 August 2017 | doi = 10.1017/S0016756807003263 | ref = harv}}
| last1 = Franzese | first1 = J. | last2 = Spalletti | first2 = L. | last3 = Pérez | first3 = I. G. | last4 = Macdonald | first4 = D. | title = Tectonic and paleoenvironmental evolution of Mesozoic sedimentary basins along the Andean foothills of Argentina (32°–54°S) | year = 2003 | journal = Journal of South American Earth Sciences | volume = 16 | issue = 1 | pages = 81-90 | url = https://www.researchgate.net/profile/David_Macdonald6/publication/223719555_Tectonic_and_paleoenvironmental_evolution_of_Mesozoic_sedimentary_basins_along_the_Andean_foothills_of_Argentina_%283254S%29/links/54b3c1cd0cf26833efcecd1f.pdf | accessdate = 13 August 2017 | doi = 10.1016/S0895-9811(03)00020-8 | ref = harv}}
| last1 = Pankhurst | first1 = R. J. | author1-link = Robert John Pankhurst | last2 = Leat | first2 = P. T. | last3 = Sruoga | first3 = P. | last4 = Rapela | first4 = C. W. | last5 = Márquez | first5 = M. | last6 = Storey | first6 = B. C. | last7 = Riley | first7 = T. R. | title = The Chon Aike province of Patagonia and related rocks in West Antarctica: A silicic large igneous province | year = 1998 | journal = Journal of Volcanology and Geothermal Research | volume = 81 | issue = 1 | pages = 113-136 | url = https://www.researchgate.net/profile/Robert_Pankhurst/publication/248256855_The_Chon_Aike_province_of_Patagonia_and_related_rocks_in_West_Antarctica_A_silicic_large_igneous_province/links/56a7497e08ae997e22bbd0a6.pdf | access-date = 13 August 2017 | doi = 10.1016/S0377-0273(97)00070-X | ref = harv}}
| last1 = Sruoga | first1 = P. | last2 = Rubinstein | first2 = N. | last3 = Hinterwimmer | first3 = G. | title = Porosity and permeability in volcanic rocks: a case study on the Serie Tobı́fera, South Patagonia, Argentina | year = 2004 | journal = Journal of Volcanology and Geothermal Research | volume = 132 | issue = 1 | pages = 31-43 | url = https://www.researchgate.net/profile/P_Sruoga/publication/248256998_Porosity_and_permeability_in_volcanic_rocks_A_case_study_on_the_Serie_Tobifera_South_Patagonia_Argentina/links/0f317539b9129c8856000000/Porosity-and-permeability-in-volcanic-rocks-A-case-study-on-the-Serie-Tobifera-South-Patagonia-Argentina.pdf | access-date = 13 August 2017 | doi = 10.1016/S0377-0273(03)00419-0 | ref = harv}}
| last1 = Torsvik | first1 = T. H. | last2 = Rousse | first2 = S. | last3 = Labails | first3 = C. | last4 = Smethurst | first4 = M. A. | title = A new scheme for the opening of the South Atlantic Ocean and the dissection of an Aptian salt basin | year = 2009 | journal = Geophys. J. Int. | volume = 177 | issue = 3 | pages = 1315-1333 | url = http://gji.oxfordjournals.org/content/177/3/1315.full.pdf+html | accessdate = 13 August 2017 | doi = 10.1111/j.1365-246X.2009.04137.x | ref = harv}}{{Refend}} Further reading
15 : Geologic formations of Argentina|Jurassic System of South America|Lower Cretaceous Series of South America|Jurassic Argentina|Cretaceous Argentina|Tithonian Stage|Berriasian Stage|Tuff formations|Cretaceous volcanism|Jurassic volcanism|Fossiliferous stratigraphic units of South America|Paleontology in Argentina|Geology of Santa Cruz Province, Argentina|Geology of Patagonia|Geology of Tierra del Fuego |
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