Magnetic Susceptibility Application: A Window onto Ancient Environments and Climatic Variations
Magnetic susceptibility (MS) is a tool frequently used by geologists on sediments or rocks to perform correlations and sea-level or climatic reconstructions. Applied measurements are made on unoriented, bulk samples and bulk MS is mostly influenced by the magnetic mineral content of the rock and often interpreted as influenced by detrital inputs. Magnetic data acquisition is fast and straightforward and this allows the high-resolution sampling needed for palaeoclimatic research (e.g. spectral analysis). However, the link with detrital inputs is not always preserved and the impact of diagenesis on the final MS signal can blur primary information. This volume includes contributions dealing with the origin of the magnetic minerals, and the application of MS as a palaeoenvironmental or palaeoclimatic proxy and also as a tool to provide astronomical calibration in order to improve the chronology of selected time intervals.
Susceptibility and radiometry data used for stratigraphic correlations: case study on Upper Triassic beds in Turkey
Published:January 01, 2015
Susanne Mayrhofer, Alexander Lukeneder, 2015. "Susceptibility and radiometry data used for stratigraphic correlations: case study on Upper Triassic beds in Turkey", Magnetic Susceptibility Application: A Window onto Ancient Environments and Climatic Variations, A. C. Da Silva, M. T. Whalen, J. Hladil, L. Chadimova, D. Chen, S. Spassov, F. Boulvain, X. Devleeschouwer
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A Julian/Tuvalian (=Lower/Upper Carnian) substage boundary within the Kasımlar Formation, recently detected at Aşağiyaylabel (Taurus Mountains, Turkey) by facies analyses and biostratigraphic ammonoid investigations, was additionally detected by magnetic susceptibility (MS) and radiometry data. The Aşağiyaylabel sequence, a key section concerning environmental changes during Early to Late Carnian time, represents a deepening sequence from platform carbonates to pelagic limestones and marls. The Julian/Tuvalian boundary strata can be correlated over wide areas due to a positive shift in MS values from 11–105×10−6 SI (range AS I, KA IV) at the Lower Carnian sediments to 62–458×10−6 SI (range AS...