Ri-μi/μm-Ci dependent oblateness of deformed pebbles in the Baraitha conglomerate, Central India and tectonic implications

Details Ri-μi/μm-Ci dependent oblateness of deformed pebbles in the Baraitha conglomerate, Central India and tectonic implications Ri-μi/μm-Ci dependent oblateness of deformed pebbles in the Baraitha conglomerate, Central India and tectonic implications

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ineps..99..321r&link_type=abstract

Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, Volume 99, Issue 2, pp.321-338

Computer Science

1

Oblateness, Viscosity Contrast, Pebble Concentration, Tectonic Strain Ratio, Initial Axial Ratio

Scientific paper

Strain analysis of the Baraitha conglomerate is attempted by direct measurements on extracted pebbles and by micrometric analysis. The overall deformation is of flattening type, with the k value lower by more than half in the matrix than in the pebbles. The viscosity contrast between pebbles and matrix ( μ i/μm) is in the ratio of 2:1 and the bulk deformation appears to be strongly controlled by Ci (concentration of pebbles expressed as percentage). The total shortening (≃35%) in the Baraitha conglomerate is comparable with the shortening accomplished in the folding of the overlying Bijawar Group volcanosedimentary sequence. The bulk strain axes X t, Yt and Z t, as determined from the analysis of the deformed conglomerate, are unsymmetrically oriented with reference to folds formed by oblique flexural-slip with neither X t nor Y tcoincident with the fold hinges. The lack of transection of folds by cleavage again suggests flattening deformation. The extension in the Y tdirection is greater in the matrix than in the pebbles.

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