1999
DOI: 10.1002/(sici)1099-1417(199903)14:2<125::aid-jqs426>3.0.co;2-0
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Glacigenic clast fabrics: genetic fingerprint or wishful thinking?

Abstract: The interpretation of glacigenic diamictons is a subjective process, for which quantitative support is frequently sought from parameters such as clast shape and fabric. It has been widely suggested that different glacigenic diamicton facies possess distinct clast‐fabric signatures. This paper examines this concept using a data set of 111 clast fabrics, and a synthesis of published results. Eigenvalues are calculated and compared for a variety sedimentary facies. It is concluded that clast fabric alone is not a… Show more

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Cited by 110 publications
(74 citation statements)
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“…Similarly, these fabrics exhibited unimodal to spread unimodal shape similar to lodgement or melt-out tills suggesting that fabric shape is also not indicative of genesis. Based on the independent evidence for deformation (gradational basal contacts with reworked till and deformed sand inclusions), we interpret our fabric data from the Tiskilwa and Sky Pilot Tills as indicators of accumulated strain and local ice-flow direction (Bennett et al, 1999;Larsen et al, 2004) but do not attempt to infer genesis from them.…”
Section: Discussionmentioning
confidence: 99%
“…Similarly, these fabrics exhibited unimodal to spread unimodal shape similar to lodgement or melt-out tills suggesting that fabric shape is also not indicative of genesis. Based on the independent evidence for deformation (gradational basal contacts with reworked till and deformed sand inclusions), we interpret our fabric data from the Tiskilwa and Sky Pilot Tills as indicators of accumulated strain and local ice-flow direction (Bennett et al, 1999;Larsen et al, 2004) but do not attempt to infer genesis from them.…”
Section: Discussionmentioning
confidence: 99%
“…This is consistent with conclusions based on the macroscopic characteristics of the various parts of the till section analysed. This is extremely important because clast fabric alone should not decide about the genetic till type (compare Bennett et al, 1999;Evans et al, 2006). A very large spread of clast orientation and the girdle fabric shape (effect of clast reorientation) in set II in section BD-2 (Figs.…”
Section: Till Fabricmentioning
confidence: 56%
“…The data show low isotropy and variable elongation, falling within known envelopes of upper till fabric, suggesting clast emplacement through lodgement and non-solid-state deformation [6,11]. In places, clast fabric data are highly bimodal (see Log 2; Fig.…”
Section: Lfa2mentioning
confidence: 99%
“…The high angularity of clasts in comparison with other studies could be due to short transport distance, as in LFA2. Clast fabric data support the interpretation of LF5a as a subglacial till, showing low isotropy and moderate to high elongation, falling within known envelopes of till fabric [6,11]. The strength and direction of preferential clast orientation vary between logged facies, but orientation is in agreement with independent ice flow indicators, inferring north-north-west to south-east ice flow in Arfertuarssuk and north-east to south-west ice flow in Tasiussaq.…”
Section: Lfa5mentioning
confidence: 99%