Magnetosusceptibility event and cyclostratigraphy method applied to marine rocks; detrital input versus carbonate productivity

Magnetic susceptibility data from marine rocks can be used for global correlation due to synchronous variations in global erosion. We show here that the magnetic susceptibility signature, found in two forms, resides mainly in paramagnetic and other detrital constituents in most marine rocks. The fir...

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Bibliographic Details
Published in:Geology (Boulder) 2000-12, Vol.28 (12), p.1135-1138
Main Authors: Ellwood, Brooks B, Crick, Rex E, El Hassani, Ahmed, Benoist, Stephen L, Young, Richard H
Format: Article
Language:English
Subjects:
Africa
carbonate rocks
Climate change
correlation
cyclostratigraphy
detrital sedimentation
Devonian
global change
high-resolution methods
magnetic susceptibility
Marine
marine environment
Morocco
North Africa
paleoclimatology
paleomagnetism
Paleozoic
Prehistoric era
productivity
regression
sea-level changes
sedimentary rocks
sedimentation
sequence stratigraphy
Soil erosion
Stone
Stratigraphy
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Summary:Magnetic susceptibility data from marine rocks can be used for global correlation due to synchronous variations in global erosion. We show here that the magnetic susceptibility signature, found in two forms, resides mainly in paramagnetic and other detrital constituents in most marine rocks. The first form is a short-term, low-magnitude, high-frequency cyclic climate signature that is often useful for regional correlation. The second form is a longer term, higher magnitude, low-frequency signature resulting from transgressive and regressive events that can be used for global correlation. Fluctuations in detrital input, due to eustatic-based erosion, are the primary cause of events. These fluctuations are driven by large-scale processes such as global orogenic cycles. However, variations in carbonate productivity cannot be ruled out when explaining the low-magnitude climate-driven cyclicity also observed in magnetic susceptibility data sets.
ISSN:0091-7613
1943-2682
DOI:10.1130/0091-7613(2000)28<1135:MEACMA>2.0.CO;2