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Modes of turbidite deposition deduced from grain-size analyses

Published online by Cambridge University Press:  01 May 2009

A. T. Buller  and
J. McManus
A. T. Buller
Affiliation:
Tay Estuary Research Centre, Old Ferry Pier Newport-on-Tay DD6 8 EX, Fife
J. McManus
Affiliation:
Department of Geology, The University Dundee, U.K.
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Summary

Values of quartile deviations (QDa) and medians (Mdmm) have been calculated from over 400 grain-size distributions of modern and ancient turbidites. Each QDa–Md pair is plotted on double-log paper to establish any distinctive trends. The QDa–Md analysis of modern turbidites reveals a steep gradient trend derived from the grain-size distributions of submarine canyon and delta fan sediments, and a shallow gradient trend derived from the grain-size distributions of samples from oceanic bottoms and nepheloid water layers. The QDa–Md analysis of ancient turbidites reveals two trends, but these do not coincide with their modern counterparts. The steeper gradient trend is related to distal and proximal turbidites, while the shallow trend is related to fluxoturbidites. The disparity between the ancient and modern QDa–Md analyses is caused by textural modifications of turbidites by diagenetic disintegration of unstable minerals. The alteration products are incorporated subsequently in the matrix. The diagenetic effects on the positions of the QDa–Md plots are demonstrated theoretically by computing the textural alteration of six modern turbidites by assuming that they will lose 20%, and then 40%, of their sand-sized particles to the matrix. By working in reverse the QDa–Md plots of ancient turbidites can be ‘restored’ to their diagenetically unaltered positions. Their restored positions correspond to the QDa–Md trends of modern turbidites.

Type
Research Article
Information
Geological Magazine , Volume 109 , Issue 6 , November 1972 , pp. 491 - 500
Copyright
Copyright © Cambridge University Press 1972

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