{"id":2506,"date":"2019-10-02T19:54:51","date_gmt":"2019-10-02T19:54:51","guid":{"rendered":"https:\/\/www.gsnv.org\/shop\/hydrothermal-alteration-of-the-late-eocene-caetano-ash-flow-caldera-north-central-nevada-a-field-and-aster-remote-sensing-study\/"},"modified":"2020-02-24T18:17:58","modified_gmt":"2020-02-24T18:17:58","slug":"hydrothermal-alteration-of-the-late-eocene-caetano-ash-flow-caldera-north-central-nevada-a-field-and-aster-remote-sensing-study","status":"publish","type":"product","link":"https:\/\/www.gsnv.org\/shop\/hydrothermal-alteration-of-the-late-eocene-caetano-ash-flow-caldera-north-central-nevada-a-field-and-aster-remote-sensing-study\/","title":{"rendered":"Hydrothermal alteration of the late Eocene Caetano ash-flow caldera, north-central Nevada: A field and ASTER remote sensing study"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Geologic mapping and analysis of ASTER remote sensing data were used to define<br \/>\nthe effects of a large hydrothermal system in the 12\u201318 by 22 km Caetano caldera.<br \/>\nThe caldera formed at ~33.8Maduring eruption of >1100km3 of the rhyolitic Caetano<br \/>\nTuff that left a 1 km deep basin which was partly filled by a lake. Magma resurgence<br \/>\nresulted in shallow(<1 km) emplacement of the Redrock Canyon granite porphyry intrusion\ninto caldera fill in the southwestern part of the caldera. Field and petrographic\nstudies indicate that heat from the pluton or from deeper residual Caetano magma\ncaused a large hydrothermal system to form that altered both the pluton and\nintracaldera Caetano Tuff throughout the western half of the caldera. ASTER-based\nmineral mapping shows that the most intense alteration, including local alunite, developed\nprimarily along the southwestern and western caldera margins. Alteration was\nmost intense in the Redrock Canyon intrusion itself and in the upper unit of the\nCaetano Tuff, which is a sequence of thin ash flows interlayered with finely bedded\nsedimentary rocks and mesobreccia. Hydrothermally altered intracaldera tuff was\ndomed and crosscut by the unaltered 33.78 \u00b1 0.05 Ma Carico Lake pluton, indicating\nthat caldera formation, magma resurgence, pluton emplacement, and hydrothermal\nactivity all occurred in less than about 100 ka.\n<\/p>\n","protected":false},"featured_media":4592,"comment_status":"closed","ping_status":"closed","template":"","meta":{"pmpro_default_level":""},"product_cat":[154],"product_tag":[],"_links":{"self":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product\/2506"}],"collection":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/comments?post=2506"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media\/4592"}],"wp:attachment":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media?parent=2506"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_cat?post=2506"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_tag?post=2506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}