Diagenetic alterations and geochemical trends in early Cretaceous shallow-water limestones of Allison and Resolution Guyots (Sites 865 to 868)

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Abstract

The diagenesis of the shallow-water Lower Cretaceous carbonates of Allison and Resolution guyots took place in response to changes in rock pore-fluid composition over time. The disappearance of the volcanic island is evidenced by the decreasing clay content of the limestones. An excellent correspondence of cyclic distributions of phosphate, manganese, copper, and zinc with sequence-stratigraphic interpretations for Site 866 was identified: primary element compositions are probably related to sea-level variations. Early diagenetic alterations are documented by different cement and porosity types. Analyses of cement chemistry and stable isotope composition permit the reconstruction of marine-phreatic, meteoric-phreatic, and meteoric-vadose diagenetic environments. -from Authors

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Rohl, U., & Strasser, A. (1995). Diagenetic alterations and geochemical trends in early Cretaceous shallow-water limestones of Allison and Resolution Guyots (Sites 865 to 868). Proc., Scientific Results, ODP, Leg 143, Northwest Pacific Atolls and Guyots, 197–229. https://doi.org/10.2973/odp.proc.sr.143.224.1995

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