Advancing knowledge on the paleoproductivity and climate in the Guaymas Basin, Gulf of California, over the past 31,200 years: geochemical proxies in IODP expedition 385 sediments

作者：Alejandro Aldama-Cervantes, Ligia Pérez‐Cruz, J. Urrutia‐Fucugauchi, María Adela Monreal‐Gómez, Martín Merino–Ibarra, Mauricio Velázquez-Aguilar, Rafael Venegas-Ferrer, Joan-Albert Sánchez-Cabeza, Abdelfettah Sifeddine, Tobias W. Höfig · 发表于：Frontiers in Earth Science · 年份：2025 · DOI：10.3389/feart.2025.1568130 · 被引用次数：3 · 研究领域：Geology and Paleoclimatology Research、Paleontology and Stratigraphy of Fossils、Isotope Analysis in Ecology

The Guaymas Basin (GB) is a highly productive region in the Gulf of California. Subseafloor sedimentary amorphous bio-opal and Ba/Ti records obtained from its northwestern and central areas reveal significant changes in exported productivity over the past 31,200 years. Millennial-scale variability reflects the influence of wind-driven upwelling, mesoscale eddies, and shifts in climate variability operating at orbital, millennial, and centennial timescales. Spatial heterogeneity in productivity recorded in International Ocean Discovery Program boreholes highlights regional differences in process dominance. We identify seven distinct productivity phases: From ∼31,200 to ∼26,500 cal yr BP, laminated sediments indicate strong seasonal variability and high productivity due to intense upwelling activity caused by northwesterly winds linked to a southward-shifted Intertropical Convergence Zone. The Last Glacial Maximum, from ∼26,500 to ∼19,000 cal yr BP., displayed pronounced fluctuations and a slight decline in productivity compared to the previous interval, owing to the reduced influence of the North Pacific High on the GB during this period. From ∼19,000 to ∼11,700 cal yr BP, there were shifts of high and low productivity, with opal minima coinciding with Heinrich events 2 and 1, as well as the Younger Dryas. Productivity declined slightly between ∼11,700 and ∼7,000 cal yr BP, featuring a short high-productivity period within that timespan (∼10,500 to ∼10,300 cal yr BP). From ∼7,...