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dc.contributor.authorZhang, Qing
dc.contributor.authorFossen, Haakon
dc.PublishedZhang Q, Fossen H. The dilemma of asymmetric porphyroclast systems and sense of shear. Journal of Structural Geology. 2020;130:103893eng
dc.description.abstractAsymmetric porphyroclast systems have long been used as independent shear-sense indicators based on their clast-tail asymmetry and/or stair-stepping tail geometry. Over the last two decades, advances in exploring the mechanical behavior of rigid clasts in a viscous flow has shed new light on understanding the formation of porphyroclast systems embedded in noncoaxial viscous flow and subsequently quantifying many aspects of flow kinematics. Using examples from naturally deformed rocks combined with results from recent advances, our study indicates that: (1) in general, only porphyroclast systems composed of equant-shaped clasts can be treated as independent shear-sense indicators; (2) special attention should be given to β-type porphyroclast systems composed of high-angle intermediate aspect-ratio clasts, which may contain meaningful information on bulk flow kinematics; (3) bookshelf structures cannot serve as independent shear-sense indicators. Multi-criteria and thorough three-dimensional shape analyses are suggested for a proper interpretation of flow kinematics in ductile shear zones.en_US
dc.rightsAttribution-NonCommercial-NoDerivs CC BY-NC-NDeng
dc.subjectPorphyroclast systemseng
dc.subjectBookshelf structureseng
dc.subjectMica fisheng
dc.subjectSense of sheareng
dc.subjectDuctile shear zoneseng
dc.titleThe dilemma of asymmetric porphyroclast systems and sense of sheareng
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holderCopyright 2019 The Author(s)eng
dc.source.journalJournal of Structural Geology

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