Influence of object concentration on finite strain and effective viscosity contrast: insights from naturally deformed packstones

摘要: Deformed conglomerates and ooidal/oncoidal packstones are commonly used to evaluate finite strain in deformed sedimentary successions. In order obtain a correct estimate of strain, it is necessary consider not only the different behaviour matrix objects, but also object concentration. The analysis two-component rocks characterised by high values packing results substantial underestimate bulk viscosity contrast between objects matrix. this study, effects volumetric fraction competent inclusions on both measured as well apparent contrast, have been investigated naturally variable concentration scale hand specimen (and hence for homogenous contrast). Object has obtained Rf/f analysis, whereas Fry method provides measure whole-rock that function inclusion Therefore, better termed effective strain. investigate role concentration, parameter plotted against contrast. These diagrams show that: (i) packing, significantly lower with respect calculated maximum value (that would result ideal case no particle interaction represents therefore real samples); (ii) shows one equal three principal sections ellipsoid), reaches value, approaches unit value. Empirical equations found link q 2005 Elsevier Ltd. All rights reserved.