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Rheomorphic ignimbrite D (13.4 Ma, Upper Mogán Formation on Gran Canaria), a multiple flow–single cooling unit, is divided
into four major structural zones that differ in fabric and finite strain of deformed pyroclasts. Their structural characteristics
indicate contrasting deformation mechanisms during rheomorphic flow. The zones are: (a) a basal zone (vitrophyre) with pure
uniaxial flattening perpendicular to the foliation; (b) an overlying shear zone characterized by asymmetric fabrics and a
significantly higher finite strain, with an ellipsoid geometry similar to stretched oblate bodies; (c) a central zone with
a finite strain geometry similar to that of the underlying shear zone but without evidence of a rotational strain component;
and (d) a slightly deformed to non-deformed top zone where the almost random orientation of subspherical pyroclasts suggests
preservation of original, syn-depositional clast shapes. Rheomorphic flow in D is the result of syn- to post-depositional
remobilization of a hot pyroclastic flow as shown by kinematic modeling based on: (a) the overall vertical structural zonation
suggested by finite strain and fabric analysis; (b) the relation of shear sense to topography; (c) the interrelationship of
the calculated vertical cooling progression at the base of the flow (formation of vitrophyre) and the related vertical changes
in strain geometry; (d) the complex lithification history; and (e) the consequent mechanisms of deformational flow. Rheomorphic
flow was caused by load pressure due to an increase in the vertical accumulation of pyroclastic material on a slope of generally
6–8°. We suggest that every level of newly deposited pyroclastic flow material of D first passed through a welding process
that was dominated by compaction (pure flattening) before rheomorphic deformation started.
Received: 25 June 1997 / Accepted: 28 October 1998 相似文献
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