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MULTIPLE SUCCESSIONS OF FOLIATION DEVELOPMENT IN SHALLOW VERSUS DEEP OROGENIC REGIMES AND THEIR RELATIONSHIP TO REGIONAL FOLDING

AUTHOR/S: H. CAO
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 121-128 pp

ABSTRACT

Fold axial plane traces and schistosity in the high temperature-low pressure regime
PreCambrian rocks in Arkansas River region preserve the effects of a succession of 5
FIA trends (foliation intersection or inflection axes in porphyroblasts). Similar fold axial
plane trace measurements in high temperature-medium pressure regime Palaeozoic
rocks in Vermont preserve the effects of only the youngest two NNW-SSE and NNESSW
trending FIAs of the 5 sets that developed in this region. The other three have no
equivalent fold axial planes. This difference from shallow to deeper orogenic regimes
reflects decreasing competency at greater pressure with collapse and unfolding of earlier
formed folds. The greater overlying load of rocks tends to flatten folds preserving only
those most recently developed or the folds

Keywords: Fold axial plane, Foliation intersection axes, Orogenic regime, Folding

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