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Book Chapter

Interpreting ignimbrite lithofacies

Published:
January 01, 2002

Abstract

This chapter presents an approach for ignimbrite description and interpretation. It draws on field, granulometric and fabric data from published descriptions of ignimbrites. To describe ignimbrites, we adopt a non-genetic lithofacies scheme (Table 5.1). This avoids possible connotations of ‘ideal’ sequences or of specific emplacement models (as in the previous schemes of 'Layers 1, 2a, 2b', 'ignimbrite types 1-3', ‘ground layer’ and ‘basal layer’). We describe some of the more common lithofacies in ignimbrites. Our list is not intended to be prescriptive, and it is to be expected that workers will in the future modify or subdivide our groupings. We then show how the lithofacies might be interpreted in terms of flow-boundary zone processes. Understanding is far from complete, and in some cases we give possible alternative interpretations that require testing (also see summary on Table 7.1, p. 120). Consideration of lithofacies that record sedimentary reworking (e.g. by wind or water) is beyond the scope of this work.

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Contents

Geological Society, London, Memoirs

Pyroclastic Density Currents and the Sedimentation of Ignimbrites

Michael J. Branney
Michael J. Branney
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Peter Kokelaar
Peter Kokelaar
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Geological Society of London
Volume
27
ISBN electronic:
9781862394025
Publication date:
January 01, 2002

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