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Isotopic composition of bank margin carbonates on Midway Atoll; amplitude constraint on post-early Miocene eustasy

Richard P. Major and R. K. Matthews
Isotopic composition of bank margin carbonates on Midway Atoll; amplitude constraint on post-early Miocene eustasy
Geology (Boulder) (June 1983) 11 (6): 335-338

Abstract

Continuously cored borehole. Subaerial exposure horizons are identified by light carbon isotope signatures. Sea-level highstands are recorded by aggradational units of reef sediment that are bounded by these subaerial exposure horizons. Sea-level lowstands are constrained to fall no farther than a meteoric-marine diagenetic boundary observed in the core. This diagenetic boundary is defined by an offset in both oxygen and carbon isotope data, light isotopic composition being indicative of intermittent meteoric diagenesis. These data constrain the amplitudes of three post-early Miocene glacio-eustatic sea-level falls to be no more than 32, 43, and 52 m. Absolute sea-level elevations are estimated by constructing a subsidence model.--Modified journal abstract.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 11
Serial Issue: 6
Title: Isotopic composition of bank margin carbonates on Midway Atoll; amplitude constraint on post-early Miocene eustasy
Affiliation: Brown Univ., Dep. Geol. Sci., Providence, RI, United States
Pages: 335-338
Published: 198306
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 27
Accession Number: 1983-046535
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N28°10'00" - N28°19'00", W177°28'00" - W177°18'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 1983
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