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Titre :
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U.S. Geological Survey professional paper, 716-E - Distribution, thickness, and lithology of Paleocene rocks in Pakistan
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Auteurs :
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Charles R. Meissner Jr., Auteur ;
Habib-ur. Rahman, Auteur
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Type de document :
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Bulletin : texte imprimé
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Paru le :
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01/01/1973
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Année de publication :
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1973
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Format :
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1 vol. (6 p.) / ill. / 28 cm
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Accompagnement :
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4 cartes depl. en pochette
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Langues:
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Américain
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Résumé :
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An isopach map and three lithofacies maps show the distribution, thickness, and lithology of Paleocene rocks in Pakistan and help to explain their depositional history. The isopach map shows a pattern of thickening and thinning of Paleooene rocks and reveals the three depositional provinces of the Indus Basin to the east and suggests two depositional provinces in the Baluchistan Basin to the west. Lithofacies contour maps of Paleocene rocks reveal high clastic and high sandstone-shale ratios along the eastern side of the Indus Basin, generally parallel to the Precambrian Indian Shield. These high ratios suggest that the main influx of sediments into the Indus Basin was from the east. Low clastic ratios along the western side of the Indus Basin reflect carbonate deposition farther offshore. The Baluchistan Basin of Pakistan is separated from the Indus Basin by the so-called central axis, along which exposures of Paleocene rocks have not been found, owing to erosion or nondeposition. Data on Paleocene rocks in the Baluchistan Basin are inadequate to construct satisfactory lithofacies maps. The little information available indicates that Paleocene rocks in the northern part of the Baluchistan Basin have high clastic ratios and that the rocks contain beds of volcanic material. The sandstone-shale ratio increases from the north and from the south toward the central part of the Baluchistan Basin, an east-west axial zone where Paleocene rocks are probably absent. Study of the lithology and thickness of oil-bearing Paleocene rocks in the Potwar-Kohat depositional province might provide criteria for oil exploration elsewhere in Pakistan.
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