Jurassic hot spring deposits of the Deseado Massif (Patagonia, Argentina): Characteristics and controls on regional distribution

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dc.contributor.author Guido, DM en
dc.contributor.author Campbell, Kathleen en
dc.date.accessioned 2012-04-02T21:33:48Z en
dc.date.issued 2011-06-01 en
dc.identifier.citation JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH 203(1-2):35-47 01 Jun 2011 en
dc.identifier.issn 0377-0273 en
dc.identifier.uri http://hdl.handle.net/2292/16456 en
dc.description.abstract The Deseado Massif, Santa Cruz Province, Argentinean Patagonia, hosts numerous Middle to Late Jurassic age geothermal and epithermal features represented by siliceous and calcareous chemical precipitates from hot springs (sinters and travertines, respectively), hydrothermal breccias, quartz veins, and widespread hydrothermal silicification. They indicate pauses in explosive volcanic activity, marking the final stages in the evolution of an extensive Jurassic (ca. 178-151 Ma) volcanic complex set in a diffuse extensional back-arc setting heralding the opening of the Atlantic Ocean. Published paleo-hot spring sites for the Deseado Massif, plus additional sites identified during our recent field studies, reveal a total of 23 locations, five of which were studied in detail to determine their geologic and facies associations. They show structural, lithologic, textural and biotic similarities with Miocene to Recent hot spring systems from the Taupo and Coromandel volcanic zones, New Zealand, as well as with modern examples from Yellowstone National Park, U.S.A. These comparisons aid in the definition of facies assemblages for Deseado Massif deposits - proximal, middle apron and distal siliceous sinter and travertine terraces and mounds, with preservation of many types of stromatolitic fabrics - that likely were controlled by formation temperature, pH, hydrodynamics and fluid compositions. Locally the mapped hot spring deposits largely occur in association with reworked volcaniclastic lacustrine and/or fluvial sediments, silicic to intermediate lava domes, and hydrothermal mineralization, all of which are related to local and regional structural lineaments. Moreover, the numerous geothermal and significant epithermal (those with published minable resources) deposits of the Deseado Massif geological province mostly occur in four regional NNW and WNW hydrothermal-structural belts (Northwestern, Northern, Central, and Southern), defined here by alignment of five or more hot spring deposits and confirmed as structurally controlled by aeromagnetic data. The Northern and Northwestern belts, in particular, concentrate most of the geothermal and epithermal occurrences. Hence, Jurassic hydrothermal fluid flow was strongly influenced by the most dominant and long-active geological boundaries in the region, the outer limits of the Deseado Massif 'horst' itself. (C) 2011 Elsevier B.V. All rights reserved. en
dc.language English en
dc.publisher Elsevier Science B.V. en
dc.relation.ispartofseries Journal of Volcanology and Geothermal Research en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0377-0273/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Science & Technology en
dc.subject Physical Sciences en
dc.subject Geosciences, Multidisciplinary en
dc.subject Geology en
dc.subject Deseado Massif en
dc.subject Patagonia en
dc.subject Jurassic hot springs en
dc.subject facies analysis en
dc.subject regional faults en
dc.subject epithermal en
dc.subject NEW-ZEALAND en
dc.subject NORTH-ISLAND en
dc.subject SILICEOUS SINTER en
dc.subject SAN AGUSTIN en
dc.subject LA MARCIANA en
dc.subject BREAK-UP en
dc.title Jurassic hot spring deposits of the Deseado Massif (Patagonia, Argentina): Characteristics and controls on regional distribution en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.jvolgeores.2011.04.001 en
pubs.issue 1-2 en
pubs.begin-page 35 en
pubs.volume 203 en
dc.rights.holder Copyright: Elsevier Science B.V. en
pubs.author-url http://www.sciencedirect.com/science/article/pii/S0377027311000837 en
pubs.end-page 47 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 212234 en
pubs.org-id Science en
pubs.org-id School of Environment en
dc.identifier.eissn 1872-6097 en
pubs.record-created-at-source-date 2012-04-03 en

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