Geological Evolution of the Precambrian Indian Shield by M. E. A. Mondal

Author:M. E. A. Mondal
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Deformation Structures

Between the two principal facies constituents the dark micritic facies has generally created the flat clasts, while the light microsparry facies has undergone ductile folding, often in a complicated fashion or complete liquefaction. The flat clast breccias bodies are generally patchy in occurrence, disrupt lamina sets from which they are generated, have indistinct boundaries grading laterally into undeformed sediments. Dark micritic facies is, at places, partially brecciated and at many other places the pristine laminae can often be reconstructed merely by rotating the clasts (Fig. 4). The flat clasts often have beveled edges, but in some clusters they are distinctly crumpled. Variation in the arrangement of elongated clasts gives rise to different forms of deformation structures described below.

Fig. 4Sporadic occurrence of breccia patches arising from local disruptions. The clasts can be traced into the primary laminae within the sediment hosting them

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