Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Girish C. S. Gaur ¹, V. K. S. Dave ¹

Affiliations
1 Department of Geology & Geophysics, University of Roorkee, Roorkee, IN

Abstract

The Blaini Formation exposed near Rishikesh, U.P., has been studied and an attempt has been made to describe its origin. It has been suggested that the lower laminated sequence and limestone were deposited during the west base glaciation; it was followed by a period of dry base glaciation during which deposition of massive tillite and limestone took place. The turbulent waters supersaturated with respect to CaCo₃ have probably deposited the limestones. This sequence was followed by an interglacial period during which shales intercalated with siltstone and sandstone, and variegated shales were deposited. The second glaciation (dry base) was of a shorter duration and deposited limestone and upper tillite. Lastly, during the waning phase of the second glaciation, deposition of the topmost bleached pink and grey shales took place.

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H. C. Khanduri ¹, R. K. Srivastava ¹, V. K. S. Dave ¹

Affiliations
1 Department of Earth Sciences, University of Roorkee, Roorkee 247 672, IN

Abstract

Within the Dudhatoli Group in the southern limb of Dudhatoli synform four mappable units have been recognised viz., the Dudhatoli granitoids, Dudhatoli schist, Flaggy quartzite and the Manila phyllite. In the area under study two generations of minor folds are recognised. Statistical analysis of minor fold axes has been carried out. It is concluded that the axes of two fold generations are not randomly distributed, they have different mean plunge direction with 2 and 196 degree of freedom. The folds of first generation (F₁ have little or poor clustering while folds of second generation (F₂) have close clustering. It is also envisaged that F₁ and F₂ folds have been formed under different tectonic environment.

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