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<p class="MsoNormal"><span style="font-size:14.0pt">Good afternoon, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Please join us for Ariana Lovings MS Defense on April 20<sup>th</sup>, 2026 at Noon in EOAS 2061.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="xmsonormal"><span style="font-size:14.0pt">Name: Ariana Lovings</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:14.0pt">Date: April 20<sup>th</sup>, 2026</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:14.0pt">Time: 12:00 PM – 2:00 PM</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:14.0pt">Location: EOAS 2061</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:14.0pt">Zoom: <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Furl%3Fq%3Dhttps%3A%2F%2Fnam04.safelinks.protection.outlook.com%2F%3Furl%253Dhttps%25253A%25252F%25252Ffsu.zoom.us%25252Fj%25252F94058698150%2526data%253D05%25257C02%25257Caa25bq%252540fsu.edu%25257C108be46ab493462b093d08de7951f682%25257Ca36450ebdb0642a78d1b026719f701e3%25257C0%25257C0%25257C639081590086786753%25257CUnknown%25257CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%25253D%25253D%25257C0%25257C%25257C%25257C%2526sdata%253DUMmgbrboVYn0QRMXdsDC71fRI97lgpXl43fXm%25252B9QpeE%25253D%2526reserved%253D0%26sa%3DD%26source%3Dcalendar%26usd%3D2%26usg%3DAOvVaw2TMkHklEfV5WFU7slNIe5w&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7C9532f7c0921547e5a8e208de9b23a8bd%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639118774628486015%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=UDFqO4fIQ2q%2FUEdo5DUpEEjxRrgVRIJg9Os9ehCboaw%3D&reserved=0" originalsrc="https://www.google.com/url?q=https://nam04.safelinks.protection.outlook.com/?url%3Dhttps%253A%252F%252Ffsu.zoom.us%252Fj%252F94058698150%26data%3D05%257C02%257Caa25bq%2540fsu.edu%257C108be46ab493462b093d08de7951f682%257Ca36450ebdb0642a78d1b026719f701e3%257C0%257C0%257C639081590086786753%257CUnknown%257CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%253D%253D%257C0%257C%257C%257C%26sdata%3DUMmgbrboVYn0QRMXdsDC71fRI97lgpXl43fXm%252B9QpeE%253D%26reserved%3D0&sa=D&source=calendar&usd=2&usg=AOvVaw2TMkHklEfV5WFU7slNIe5w" target="_blank">
<span style="font-size:12.0pt">https://fsu.zoom.us/j/94058698150</span></a></span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Title: </span><span style="font-size:14.0pt;color:black">Geochemical Evidence for Widespread Off-Axis Hydrothermal Circulation: tracking Diffusive Exchange in Sediment Porewater Chemistry<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:14.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Abstract: </span><span style="font-size:14.0pt;color:black">Off-axis hydrothermal flow is a widespread but under recognized process occurring within basaltic basement beneath deep-sea sediments. While high-temperature
ridge-axis systems have been extensively characterized, the geochemical expression and quantitative contribution of off-axis systems to global ocean biogeochemical cycles remain poorly constrained. This study develops a geochemical framework for identifying off-axis
hydrothermal influence using sediment porewater data from scientific ocean drilling programs. Four regions with confirmed off-axis circulation were examined through a literature review to establish reference geochemical patterns. Concentration differences
between sediment and basalt layers drive porewater gradient reversals of Sr²</span><span style="font-size:14.0pt;font-family:"Cambria Math",serif;color:black">⁺</span><span style="font-size:14.0pt;color:black">, Ca</span><span style="font-size:14.0pt;font-family:"Aptos",sans-serif;color:black">²</span><span style="font-size:14.0pt;font-family:"Cambria Math",serif;color:black">⁺</span><span style="font-size:14.0pt;color:black">,
Mg</span><span style="font-size:14.0pt;font-family:"Aptos",sans-serif;color:black">²</span><span style="font-size:14.0pt;font-family:"Cambria Math",serif;color:black">⁺</span><span style="font-size:14.0pt;color:black">, SO</span><span style="font-size:14.0pt;font-family:"Aptos",sans-serif;color:black">₄²</span><span style="font-size:14.0pt;font-family:"Cambria Math",serif;color:black">⁻</span><span style="font-size:14.0pt;color:black">,
and NH</span><span style="font-size:14.0pt;font-family:"Aptos",sans-serif;color:black">₄</span><span style="font-size:14.0pt;font-family:"Cambria Math",serif;color:black">⁺</span><span style="font-size:14.0pt;color:black"> near the sediment–basement interface,
which serve as proxies for this circulation. To assess the broader occurrence of these proxies, the first-ever integrated sediment porewater dataset from IODP expeditions (“SED-PIE”) was compiled by aggregating porewater data from all DSDP, ODP, and IODP expeditions.
A web-scraping, AI-assisted Python script was developed to systematically screen both expedition reports and the new SED-PIE dataset for off-axis hydrothermal circulation proxies. This approach identified 35 new sites with geochemical signatures of off-axis
flow, suggesting that this flow may be more widespread than previously documented. Because individual concentration profiles can be superimposed by diagenesis or other chemical reactions, ⁸⁷Sr/⁸⁶Sr isotope ratios were also evaluated as a potentially more specific
diagnostic tool. At IODP Sites U1540 and U1541, located on the western flank of the East Pacific Rise ~130-180 nmi from the spreading axis, porewater concentration profiles show some features suggestive of off-axis hydrothermal circulation but not all proxies
agree. The strontium isotope ratios also clearly exhibit curvature toward modern seawater values near the sediment–basement interface, consistent with diffusive exchange with basalt-derived fluids. These results suggest that while traditional tracers may provide mixed evidence
for off-axis circulation, Sr isotopes may serve as a more sensitive proxy for off-axis hydrothermal circulation. The site identification in this study focuses on geochemical and isotopic porewater profiles, but other physical proxies are essential for understanding
subsurface hydrologic pathways and quantifying off-axis hydrothermal fluxes. Therefore, a limited heat flow dataset for newly identified sites is presented. This study introduces a robust method of identifying sites of off-axis hydrothermal circulation and
provides some data which can be used to later quantify flux in these regions. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Best, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Adea<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Segoe Script"">Adea Arrison<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Segoe Script"">Sr. Academic Program Specialist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Segoe Script"">Department of Earth, Ocean & Atmospheric Science<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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