{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T12:48:16Z","timestamp":1740142096453,"version":"3.37.3"},"reference-count":49,"publisher":"Geological Society of London","issue":"4","license":[{"start":{"date-parts":[[2020,7,15]],"date-time":"2020-07-15T00:00:00Z","timestamp":1594771200000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"funder":[{"DOI":"10.13039\/501100000038","name":"Natural Sciences and Engineering Research Council of Canada","doi-asserted-by":"crossref","award":["Engage Grant, 528357-18"],"award-info":[{"award-number":["Engage Grant, 528357-18"]}],"id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["GEEA"],"published-print":{"date-parts":[[2020,11]]},"abstract":"<jats:p>\n            Rhyolitic rocks hosting the El Zapote epithermal Ag deposit are pervasively altered and contain ammonium ranging from 290 to 1750\u2005ppm. High ammonium values are found in samples containing abundant fine-grained illite. This fine-grained illite shows overall low ratios of K\/(Al\u2009+\u2009Fe), likely due to ammonium substituting K\n            <jats:sup>+<\/jats:sup>\n            . Samples containing high ammonium, greater than 1000\u2005ppm in the proximity of Ag-bearing veins, show distinct absorption features of ammonium in short-wave infrared (SWIR) absorption spectra. Samples containing ammonium ranging from 500 to 1000\u2005ppm show mixed absorption signatures; some show prominent absorption features related to ammonium, whereas others have no recognizable features. There is no discernible absorption feature related to ammonium for samples containing less than 500\u2005ppm NH\n            <jats:sub>4<\/jats:sub>\n            . The data suggest that SWIR spectroscopy is useful in locating the proximal areas to mineralization, but the extent of ammonium alteration is much larger than that identified by SWIR spectroscopy. Nitrogen isotope compositions of ammonium are similar to those of sedimentary rocks, suggesting that the source of ammonium in altered rhyolite is sedimentary basement rocks in the area.\n          <\/jats:p>\n          <jats:p content-type=\"supplementary-material\">\n            <jats:bold>Supplementary material<\/jats:bold>\n            : bulk rock composition is available at\n            <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" specific-use=\"dataset is-supplemented-by\" xlink:href=\"https:\/\/doi.org\/https:\/\/doi.org\/10.6084\/m9.figshare.c.5015663\">https:\/\/doi.org\/10.6084\/m9.figshare.c.5015663<\/jats:ext-link>\n          <\/jats:p>","DOI":"10.1144\/geochem2020-017","type":"journal-article","created":{"date-parts":[[2020,6,12]],"date-time":"2020-06-12T12:57:09Z","timestamp":1591966629000},"page":"451-460","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Ammonium abundance and short-wave infrared absorption spectra of altered rocks"],"prefix":"10.1144","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6757-707X","authenticated-orcid":false,"given":"Keiko","family":"Hattori","sequence":"first","affiliation":[{"name":"Department of Earth and Environmental Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada"}]},{"given":"Anna","family":"Fonseca","sequence":"additional","affiliation":[{"name":"SRK Consulting, Toronto, Ontario, M5H 3B7."}]},{"given":"Tabetha","family":"Sheppard","sequence":"additional","affiliation":[{"name":"Department of Earth and Environmental Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada"}]}],"member":"1881","published-online":{"date-parts":[[2020,7,15]]},"reference":[{"key":"e_1_3_5_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0146-6380(98)00072-2"},{"key":"e_1_3_5_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0377-0273(02)00247-0"},{"key":"e_1_3_5_4_1","first-page":"1","article-title":"Controls on formation of low-sulfidation epithermal deposits in Mexico: Constraints from fluid inclusion and stable isotope data","volume":"8","author":"Albinson T.","year":"2001","unstructured":"Albinson, T., Norman, D.I., Cole, D. and Chomiak, B. 2001. 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