A long section of serpentinized depleted mantle peridotite

• 成果类型: Article
• 署名作者: Lissenberg, C. Johan; Mccaig, Andrew M.; Lang, Susan Q.; Blum, Peter; Abe, Natsue; Brazelton, William J.; Coltat, Remi; Deans, Jeremy R.; Dickerson, Kristin L.; Godard, Marguerite; John, Barbara E.; Klein, Frieder; Kuehn, Rebecca; Lin, Kuan-Yu; Liu, Haiyang; Lopes, Ethan L.; Nozaka, Toshio; Parsons, Andrew J.; Pathak, Vamdev; Reagan, Mark K.; Robare, Jordyn A.; Savov, Ivan P.; Schwarzenbach, Esther M.; Sissmann, Olivier J.; Southam, Gordon; Wang, Fengping; Wheat, C. Geoffrey; Anderson, Lesley; Treadwell, Sarah
• 署名单位: Cardiff University; University of Leeds; Woods Hole Oceanographic Institution; Texas A&M University System; Texas A&M University College Station; Japan Agency for Marine-Earth Science & Technology (JAMSTEC); Utah System of Higher Education; University of Utah; Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Instituto Andaluz de Ciencias de la Tierra (IACT); University of Granada; University of Southern Mississippi; University of California System; University of California Santa Cruz; Centre National de la Recherche Scientifique (CNRS); Universite de Montpellier; University of Wyoming; Woods Hole Oceanographic Institution; Martin Luther University Halle Wittenberg; University of Delaware; Chinese Academy of Sciences; Stanford University; Okayama University; University of Plymouth; Central University of Punjab; University of Iowa; Arizona State University; Arizona State University-Downtown Phoenix; University of Fribourg; IFP Energies Nouvelles; University of Queensland; Shanghai Jiao Tong University; University of Alaska System; University of Alaska Fairbanks; University of North Dakota Grand Forks
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12446
• DOI: 10.1126/science.adp1058
• 发表日期: 2024-08-09
• 页码: 623-629
• 关键词: mid-atlantic ridge; city hydrothermal field; lost city; melt extraction; ocean ridges; carbon; geochemistry; beneath; floor; constraints

摘要

The upper mantle is critical for our understanding of terrestrial magmatism, crust formation, and element cycling between Earth's solid interior, hydrosphere, atmosphere, and biosphere. Mantle composition and evolution have been primarily inferred by surface sampling and indirect methods. We recovered a long (1268-meter) section of serpentinized abyssal mantle peridotite interleaved with thin gabbroic intrusions. We find depleted compositions with notable variations in mantle mineralogy controlled by melt flow. Dunite zones have predominantly intermediate dips, in contrast to the originally steep mantle fabrics, indicative of oblique melt transport. Extensive hydrothermal fluid-rock interaction is recorded across the full depth of the core and is overprinted by oxidation in the upper 200 meters. Alteration patterns are consistent with vent fluid composition in the nearby Lost City hydrothermal field.