Magnetic resonance imaging analyses of varved marine sedimentary records of the Gulf of California

Abstract

Nuclear Magnetic Resonance Imaging used for the first time to analyze marine sedimentary records of the Gulf of California is a remarkable improvement over the more conventional X‐ray technique in the identification of organic rich layers. Analytical results indicate that NMRI differentiates clearly between organic rich (light) and organic poor (dark) deposits. It also provides a fine resolution of sedimentary structures, laminae and stratigraphic subtleties. It may be made to yield a three‐dimensional stratigraphy; the procedure is nondestructive. The organic vs. inorganic resolution provided by NMRI technology complemented by X‐ray when needed should facilitate future studies of paleoceanographic, paleoclimatic and biogeochemical cycles recorded in the vast deposits of marine clays.

Ultra-Small Carbon Samples and the Dating of Sediments

“…The samples were thin sections taken across the core at well-defined varves, as indicated by nuclear magnetic resonance imaging (Briskin et al, 1986). An aliquot of 1-1.5g from each depth was used to obtain various organic fractions.…”