Sedimentology Of The Ghazij Formation, Kach Area, Baluchistan
Abstract
Sedimentary structures, palaeocurrents and lithofacies associations of the Ghazij Formation were studied in Kach area of Baluchistan. A variety of sedimentary structures including several types of sole marks, cross-strata, convolute laminae, current ripples, mudcracks, graded beds and other biogenic structures are commonly present. Palaeocurrent directions are mostly from northeast to southwest and some from southeast to northwest suggesting that flow was generally from east to west. Study of lithofacies associations shows that cyclicity, although not very prominant, is present and suggests a general coarsening-upwards trend in the middle part and a marked fining-upwards cycle in the upper part of the formation. These rhythmic and graded sandstone strata in lower shale-dominant part of the formation possess characters of the turbidites. Similarly, the uppermost part of the formation is also shale-dominant, suggesting a marine transgression. Most characters support a deltaic origin for succession of the Ghazij Formation.
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