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However, the well-known serpentinization reaction does not appear to be the main mechanism generating H<jats:sub>2<\/jats:sub> at this site. Rather, the H<jats:sub>2<\/jats:sub> is generated as follows: (1)\u2009by alteration of basaltic lava at depth <jats:italic>via<\/jats:italic> reaction with seawater flowing from Ghoubbet Bay towards Lake Asal; (2)\u2009by simple degassing of the volcanic chamber located a few kilometers below the Fiale Caldera in the rift axis; or (3)\u2009as a result of pyritization processes <jats:italic>via<\/jats:italic> the oxidation of H<jats:sub>2<\/jats:sub>S. Study of microorganisms did not indicate any production or consumption of H<jats:sub>2<\/jats:sub>, CO<jats:sub>2<\/jats:sub>, or CH<jats:sub>4<\/jats:sub>; therefore, it is unlikely that microorganisms affected H<jats:sub>2<\/jats:sub> gas contents measured at the surface. However, air contamination at fumaroles is typically considerable and may limit interpretation of such processes. Drill cuttings from the Fiale 1 (F1) and Gale le Goma 1 (Glc1) wells (located on the inner and outer rift margins, respectively) were analyzed to determine where H<jats:sub>2<\/jats:sub> is generated. Total rock analyses indicated distinct zones at depths of 464\u2009m and 280\u2009m for F1 and Glc1, respectively, representing the boundary between the Asal and Strato\u00efd Basalts. <jats:sup>57<\/jats:sup>Fe M\u00f6ssbauer analyses show a decrease in the percentage of Fe<jats:sup>3+<\/jats:sup> at depth, indicating that Fe<jats:sup>2+<\/jats:sup>-rich minerals, particularly in the Strato\u00efd Basalts, may be a source of H<jats:sub>2<\/jats:sub>. Based on well data from the rift center and the outer rift margin, it is evident that H<jats:sub>2<\/jats:sub> is present at the surface in the rift axis and that this area offers good remnant potential because of the presence of Fe-rich chlorite. Conversely, few H<jats:sub>2<\/jats:sub> emissions were measured at the surface on the outer rift margins, although well data showed some H<jats:sub>2<\/jats:sub> (\u223c0.25%) at depth. The presence of a cap rock in the rift axis has not yet been proven; however, the high loss on ignition and the mineralogy in well Glc1 may indicate that the rocks are sufficiently altered into clays to offer potential as a H<jats:sub>2<\/jats:sub> seal. If so, the rift margins would offer greater exploration potential than the rift center.<\/jats:p>","DOI":"10.1051\/bsgf\/2023004","type":"journal-article","created":{"date-parts":[[2023,3,27]],"date-time":"2023-03-27T18:54:45Z","timestamp":1679943285000},"page":"9","source":"Crossref","is-referenced-by-count":21,"title":["Natural hydrogen potential and basaltic alteration in the Asal\u2013Ghoubbet rift, Republic of Djibouti"],"prefix":"10.1051","volume":"194","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5285-728X","authenticated-orcid":false,"given":"Gabriel","family":"Pasquet","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amin Mohamed","family":"Idriss","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lou","family":"Ronjon-Magand","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8683-728X","authenticated-orcid":false,"given":"Magali","family":"Ranchou-Peyruse","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-3855-1076","authenticated-orcid":false,"given":"Marion","family":"Guignard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mathieu","family":"Duttine","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5700-9805","authenticated-orcid":false,"given":"Anthony","family":"Ranchou-Peyruse","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4215-4764","authenticated-orcid":false,"given":"Isabelle","family":"Moretti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"250","published-online":{"date-parts":[[2023,6,2]]},"reference":[{"key":"R1","unstructured":"Abdillahi MM. 2014. 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