{"id":17043,"date":"2022-01-05T14:53:14","date_gmt":"2022-01-05T22:53:14","guid":{"rendered":"https:\/\/www.darkenergybiosphere.org\/?post_type=publication&#038;p=17043"},"modified":"2022-01-05T14:53:14","modified_gmt":"2022-01-05T22:53:14","slug":"workshop-report-exploring-deep-oceanic-crust-off-hawaii","status":"publish","type":"publication","link":"https:\/\/www.darkenergybiosphere.org\/publication\/workshop-report-exploring-deep-oceanic-crust-off-hawaii\/","title":{"rendered":"Workshop report: Exploring deep oceanic crust off Hawai`i"},"content":{"rendered":"<div id=\"abstract\" class=\"abstract sec\">\n<div class=\"abstract-content show-no-js grid-container\">\n<p id=\"d1e416\">For more than half a century, exploring a complete sequence of the oceanic crust from the seafloor through the Mohorovi\u010di\u0107 discontinuity (Moho) and into the uppermost mantle has been one of the most challenging missions of scientific ocean drilling. Such a scientific and technological achievement would provide humankind with profound insights into the largest realm of our planet and expand our fundamental understanding of Earth&#8217;s deep interior and its geodynamic behavior. The formation of new oceanic crust at mid-ocean ridges and its subsequent aging over millions of years, leading to subduction, arc volcanism, and recycling of some<span id=\"page70\"><\/span>\u00a0components into the mantle, comprise the dominant geological cycle of matter and energy on Earth. Although previous scientific ocean drilling has cored some drill holes into old (<span class=\"inline-formula\">&gt;<\/span>\u2009110\u2009Ma) and young (<span class=\"inline-formula\">&lt;<\/span>\u200920\u2009Ma) ocean crust, our sampling remains relatively shallow (<span class=\"inline-formula\">&lt;<\/span>\u20092\u2009km into intact crust) and unrepresentative of average oceanic crust. To date, no hole penetrates more than 100\u2009m into intact average-aged oceanic crust that records the long-term history of seawater\u2013basalt exchange (60 to 90\u2009Myr). In addition, the nature, extent, and evolution of the deep subseafloor biosphere within oceanic crust remains poorly unknown. To address these fundamentally significant scientific issues, an international workshop \u201cExploring Deep Oceanic Crust off Hawai`i\u201d brought together 106 scientists and engineers from 16 countries that represented the entire spectrum of disciplines, including petrologists, geophysicists, geochemists, microbiologists, geodynamic modelers, and drilling\/logging engineers. The aim of the workshop was to develop a full International Ocean Discovery Program (IODP) proposal to drill a 2.5\u2009km deep hole into oceanic crust on the North Arch off Hawai`i with the drilling research vessel\u00a0<i>Chikyu<\/i>. This drill hole would provide samples down to cumulate gabbros of mature (<span class=\"inline-formula\">\u223c<\/span>\u200980\u2009Ma) oceanic crust formed at a half spreading rate of\u00a0<span class=\"inline-formula\">\u223c<\/span>\u20093.5\u2009cm\u2009a<span class=\"inline-formula\"><sup>\u22121<\/sup><\/span>. A Moho reflection has been observed at\u00a0<span class=\"inline-formula\">\u223c<\/span>\u20095.5\u2009km below the seafloor at this site, and the workshop concluded that the proposed 2.5\u2009km deep scientific drilling on the North Arch off Hawai`i would provide an essential \u201cpilot hole\u201d to inform the design of future mantle drilling.<\/p>\n<\/div>\n<\/div>\n","protected":false},"template":"","tags":[],"publication_type":[19],"_links":{"self":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication\/17043"}],"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=17043"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/tags?post=17043"},{"taxonomy":"publication_type","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication_type?post=17043"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}