Cyclic sedimentation in the Permian coal measures of New South Wales

Duff, P. McL. D.

doi:10.1080/00167616708728667

Cited by 28 publications

(12 citation statements)

References 8 publications

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“…The lines are closely comparable with each other and with those given by Duff (1967), Dean (1967, 1976), Johnson and Cook (1973), Casshyap (1975) and Hota and Pandya (2002). The computed values of 'F' in case of two firstdegree lines (x vs. y and x vs. z) and one second-degree line (x vs. y) exceed the critical value at the 5% significance level (Table 3).…”

Section: Regression Analysissupporting

confidence: 87%

“…These methods have been extensively used for analysis of coal measure cyclothems as well as alluvial, deltaic and marine successions of different ages and countries (Miall, 1973;Casshyap, 1975;Kumar, 1990;Sukla et al 1996). Quantitative relationship between net subsidence and sedimentary cycles can throw light on the cause of cyclic sedimentation (Duff, 1967;Johnson and Cook, (c) to establish the relationship between net subsidence (thickness of strata) and number and average thickness of sedimentary cycles, and (d) to analyse the cause of cyclicity vis-à-vis Karharbari sedimentation during Early Permian.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic sedimentation of the Karharbari Formation (Damuda Group), Talchir Gondwana basin, Orissa

Hota

Sahoo

2009

J Geol Soc India

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The cyclic arrangement of lithofacies of the Karharbari Formation of the Damuda Group from a part of the Talchir Gondwana basin has been examined by statistical techniques. The lithologies have been condensed into five facies states viz. coarse-, medium-, fine-grained sandstones, shale and coal for the convenience of statistical analyses. Markov chain analysis indicates the arrangement of Karharbari lithofacies in form of fining upward cycles. A complete cycle consists of conglomerate or coarse-grained sandstone at the base sequentially succeeded by medium-and finegrained sandstones, shale and coal at the top. The entropy analysis categorizes the Karharbari cycles into the C-type cyclicity, which is essentially a random sequence of lithologic states. Regression analysis undertaken in the present study indicates the existence of sympathetic relationship between total thickness of strata (net subsidence) and number and average thickness of sedimentary cycle and antipathic relationship between number and average thickness of sedimentary cycle. These observations suggest that cyclic sedimentation of the Karharbari Formation was controlled by autocyclic process by means of lateral migration of streams activated by intrabasinal differential subsidence, which operated within the depositional basin and the channels carrying coarse grade clastic sediments, which make the cycles thicker, tend to be more common in the areas of maximum subsidence. Clastic sediments issued from the laterally migrating rivers interrupted the cyclic sedimentation of the Karharbari Formation in many instances.

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Section: Regression Analysissupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Cyclic sedimentation of the Karharbari Formation (Damuda Group), Talchir Gondwana basin, Orissa

Hota

Sahoo

2009

J Geol Soc India

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“…taken as a measure of the relative intensity or rate of downwarping contemporaneous with sedimentation (Cook, 19696). Duff (1967), on the other hand, mentioned that though there is much evidence of contemporaneous folds and associated faults in the Northern Coalfield of the Sydney Basin, 'little evidence of similar complications has been found in the Southern Coalfield'. The following facts support his statement: (1) there is no significant indication of the convergence of ply structure, i.e.…”

Section: Cause Of Thickness Variationmentioning

confidence: 93%

Geological interpretation of ply structure of the Bulli Seam, Sydney Basin, N.S.W.

Shibaoka

Bennett

1975

Journal of the Geological Society of Australia

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“…Though these conditions prevail in an array of depositional environments, basin tectonism plays a key role in controlling the local base level and extent of peat forming mires. Significant statistical relationships between the number and thickness of coal cycles and net local subsidence of the basin floor have been demonstrated for various coal basins (Duff and Walton, 1962;Duff, 1967;Read and Dean, 1967, 1968, 1976, Johnson and Cook, 1973Casshyap, 1975 etc). Hota and Pandya (2002) and Hota and Sahoo (2009) have also established similar relationships for the Barakar and Karharbari Formations of the Talchir Gondwana basin respectively.…”

Section: Importance Of Intrabasinal Differential Subsidence In Peat Amentioning

confidence: 98%

Coal correlation and intrabasinal differential subsidence — A case study from the Barakar Formation of Talchir Gondwana Basin, Orissa

Hota

2010

J Geol Soc India

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In case of autocyclic sedimentation, direct relationship exists between net thickness of strata and number of coal cycles. Many of the coal basins including coal bearing Gondwana basins of India are good examples of autocyclic sedimentation, in which the cyclicity is attributed to intrabasinal differential subsidence of the basin floor. In the present work an attempt has been made to quantify the intrabasinal subsidence in a part of the Barakar Formation of the Talchir Gondwana basin. Eight undisturbed intervals were delineated in the Barakar stratigraphy. During different phases of sedimentation, different parts of the study area subsided with varying magnitudes. The areas of maximum subsidence accommodated thicker sediment column in comparison to the areas of slow subsidence rate.

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Cyclic sedimentation in the Permian coal measures of New South Wales

Cited by 28 publications

References 8 publications

Cyclic sedimentation of the Karharbari Formation (Damuda Group), Talchir Gondwana basin, Orissa

Cyclic sedimentation of the Karharbari Formation (Damuda Group), Talchir Gondwana basin, Orissa

Geological interpretation of ply structure of the Bulli Seam, Sydney Basin, N.S.W.

Coal correlation and intrabasinal differential subsidence — A case study from the Barakar Formation of Talchir Gondwana Basin, Orissa

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