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

K. Akhtar ¹, M. Mujtaba Khan ¹, A. H. M. Ahmad ¹

Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh-202002, IN

Abstract

The Nimar Sandstone were studied with a view to understanding the nature of the Narmada  basin and its tectonic setting during an important event which took place on a global scale. The sandstones are predominantly quartzarenitcs composed mainly of several varietics of quartz, mica, rock fragments, feldspar and heavy minerals derived from the underlying Plecambrian basement. An integrated approach suggests that the Nimar Sandstone was derived from fault-bound uplifts of continental basement rocks and accumulated without much transport in the incipient rift belt of the Narmada basin.

Keywords

Sedimentology, Tectonics, Nimar Sandstone, Cretaceous, Gujarat.

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K. Akhtar ¹, A. H. M. Ahmad ¹, M. M. Khan ¹, A. Z. Khan ¹

Affiliations
1 Dept. of Geology Aligarh Muslim University Aligarh-202 002, IN

Abstract

No Abstract.

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K. Akhtar ¹, D. A. Khan ¹

Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh 202002, IN

Abstract

The Cretaceous sedimentary sequence of Narmada basin comprise a lower clastic formation (Nimar Sandstone) and an upper carbonate sequence (Karondia Limestone). The depositional model of limestones was reconstructed by identifying 8 microfacies which were regrouped into 5 facies associations. The carbonate sequence of the study area was interpreted to be deposited on a ramp without a striking break in the slope of the ramp and where shelf margin was not developed. The vertical arrangement of facies of Karondia Limestone forms a shallowing upward sequence. It shows much lateral and vertical variation which can be attributed to deposition on a platform dotted by a mosaic of exposed banks or island separated by subtidal areas with the whole complex shifting both laterally and vertically in response to hydrodynamic conditions through time.

Keywords

Sedimentology, Cretaceous, Limestone, Narmada Basin.

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