Susceptibility as a tool for studying magnetic stratigraphy of marine sediments

Somayajulu, B.L.K.; Radhakrishnamurty, C.; Walsh, Timothy J.

doi:10.1007/bf02861514

Cited by 1 publication

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“…Initial reports of the potential value of WCMS logging in lithostratigraphic studies of deep-sea sediments were published by Radhakrishnamurty et al (1968), Amin et al (1972), and Somayajulu et al (1974Somayajulu et al ( , 1975. At the same time, some paleolimnologists were already using WCMS logging for multiple correlation of lake sediment cores (e.g., Thompson, 1973;Thompson et al, 1975;Oldfield et al, 1978;Thompson and Morton, 1979), based on a technique for WCMS scanning of wet sediments described by Molyneux and Thompson (1973).…”

Section: Introductionmentioning

confidence: 99%

Applications for Whole-Core Magnetic Susceptibility Measurements of Deep-Sea Sediments: Leg 115 Results

Robinson¹

1990

Proceedings of the Ocean Drilling Program

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Whole-core (WC) measurements of low-field magnetic susceptibility (MS) provide an extremely simple, rapid, and nondestructive technique for high-resolution core logging and lithostratigraphic correlation between subsidiary holes at Ocean Drilling Program (ODP) sites. This is particularly useful for reconstructing composite, stratigraphically continuous sequences for individual ODP sites by splicing the uninterrupted records obtained from subsections of offset cores recovered from adjacent holes. Correlation between the WCMS profiles of holes drilled at different sites is also possible in some instances, especially when lithologic variations at each site are controlled by regional paleoceanographic or global (i.e., orbitally forced) paleoclimatic changes. In such circumstances, WCMS may also be used as a proxy paleoclimatic indicator, duly assisting climatostratigraphic zonation of the recovered sequence by more conventional microfossil and isotopic techniques. High-resolution WCMS profiles are also useful in detecting intervals of the recovered sequence affected by drilling disturbance, in the form of contamination by pipe rust or similar metallic artifacts as well as discontinuities related to repenetration of the corer or loss of material between successively cored intervals. Stratigraphic intervals that have been affected by early (suboxic) diagenesis resulting from a high initial organic matter content of the sediment are also readily identified by WCMS logging. The MS signal of horizons affected by suboxic diagensis is typically degraded in proportion to the duration and intensity (related to initial C org concentration) of organic matter remineralization. The lowering of MS values during suboxic diagenesis results from "dissolution" (bacterially mediated ionic dissociation) of magnetic iron and manganese oxides and oxyhydroxides in the sediment. It is to be hoped that, on future ODP (or similar) cruises, WCMS logging will cease to be regarded as a mere adjunct to paleomagnetic measurements, but rather as a simple, yet powerful, lithostratigraphic tool, directly analogous to downhole geophysical logging tools, and complimentary to shipboard techniques for whole-core measurements of physical properties (e.g., P-wave logging, GRAPE, etc.).

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Section: Introductionmentioning

confidence: 99%

Applications for Whole-Core Magnetic Susceptibility Measurements of Deep-Sea Sediments: Leg 115 Results

Robinson¹

1990

Proceedings of the Ocean Drilling Program

View full text Add to dashboard Cite

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Susceptibility as a tool for studying magnetic stratigraphy of marine sediments

Cited by 1 publication

References 23 publications

Applications for Whole-Core Magnetic Susceptibility Measurements of Deep-Sea Sediments: Leg 115 Results

Applications for Whole-Core Magnetic Susceptibility Measurements of Deep-Sea Sediments: Leg 115 Results

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