{"id":13324,"date":"2019-01-15T13:04:03","date_gmt":"2019-01-15T21:04:03","guid":{"rendered":"https:\/\/www.darkenergybiosphere.org\/?post_type=publication&#038;p=13324"},"modified":"2019-02-01T10:50:08","modified_gmt":"2019-02-01T18:50:08","slug":"geology-and-fluid-discharge-at-dorado-outcrop-a-low-temperature-ridge-flank-hydrothermal-system","status":"publish","type":"publication","link":"https:\/\/www.darkenergybiosphere.org\/publication\/geology-and-fluid-discharge-at-dorado-outcrop-a-low-temperature-ridge-flank-hydrothermal-system\/","title":{"rendered":"Geology and Fluid Discharge at Dorado Outcrop, a Low Temperature Ridge-Flank Hydrothermal System"},"content":{"rendered":"<p>Two expeditions to Dorado Outcrop on the eastern flank of the East Pacific Rise and west of the Middle America Trench collected images, video, rocks and sediment samples and measured temperature and fluid discharge rates to document the physical and biogeochemical characteristics of a regional, low\u2010temperature (~15\u00b0C) hydrothermal system. Analysis of video and images identified lava morphologies: pillow, lobate, and sheet flows. Glasses from collected lavas were consistent with an off\u2010axis formation. Hydrothermal discharge generally occurs through pillow lavas, but is patchy, sporadic, and sometimes ceases at particular sites of discharge. Year\u2010long temperature measurements at five of these discharge sites show daily ranges that oscillate with tidal frequencies by 6\u00b0C or more. Instantaneous fluid discharge rates (0.16 to 0.19 L s<sup>\u20101<\/sup>) were determined resulting in a calculated discharge of ~200 L s<sup>\u20101<\/sup>\u00a0when integrated over the area defined by the most robust fluid discharge. Such discharge has a power output of 10\u201012 MW. Hydrothermal seepage through thin sediment adjacent to the outcrop accounts for &lt;3% of this discharge, but seepage may support an oxic sediment column. High extractable Mn concentrations and depleted \u03b4<sup>13<\/sup>C in the low but variable organic solid phase suggest hydrothermal fluids provide a source for manganese accumulation and likely enhance the oxidation of organic carbon. Comparisons of the physical and geochemical characteristics at Dorado and Baby Bare Outcrops, the latter being the only other site of ridge\u2010flank hydrothermal discharge that has been sampled directly, suggest commonalities and differences that have implications for future discoveries.<\/p>\n","protected":false},"template":"","tags":[],"publication_type":[19],"_links":{"self":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication\/13324"}],"collection":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication"}],"about":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/types\/publication"}],"wp:attachment":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/media?parent=13324"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/tags?post=13324"},{"taxonomy":"publication_type","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication_type?post=13324"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}