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Analysis of cyclical sedimentation in the lower Permian Mchuchuma coalfield (South-West-Tanzania)

Journal Article:

Abstract

A statistical approach by a modified Markov process model was used to prove that the lower Permian coal measures of the Tanzanian Mchuchuma basin developed distinct cyclicities during deposition. From results the transition path of lithologic states typical for this coal sequence is as follows: (A) coarse sandstone, (B) medium sandstone, (C) fine-very fine sandstone, (D) shale, (E) mudstone, (F) coal or (E+F) and again (A) coarse sandstone. The majority of cycles is asymmetric (ABCDEF-ABC..) but symmetrical cycles are present as well (ABCDEFED). The statistical results concur with observed sedimentological evidence of depositional environment. Fining upward cycles correspond to the development of basal channel bars, changing into levees, then into back swamps which are topped by coal swamps. Frequent interbedding of coal and mudstone in the upper part of the coal measures calls for periodic flooding and flushing of fine clastics into coal-forming swamps causing interruption of peat formation. Cyclical deposition is explained by wandering channels in response to varying discharge and rate of deposition, their lateral frequent shifting caused the formation of asymmetrical cycles in this fluviodeltaic depositional model. 33 refs., 7 figs., 1 tab.
Publication Date:
Jan 01, 1987
Product Type:
Journal Article
Reference Number:
CLA-88-080180; EDB-88-127746
Resource Relation:
Journal Name: Geol. Rundsch.; (Germany, Federal Republic of); Journal Volume: 76:3
Subject:
01 COAL, LIGNITE, AND PEAT; COAL DEPOSITS; GEOLOGIC HISTORY; TANZANIA; COAL SEAMS; DEPOSITION; LITHOLOGY; MARKOV PROCESS; PEAT; PERMIAN PERIOD; RIVER DELTAS; SANDSTONES; SEDIMENTS; SHALES; STATISTICS; STRATIGRAPHY; SWAMPS; AFRICA; AQUATIC ECOSYSTEMS; COASTAL REGIONS; DEVELOPING COUNTRIES; ECOSYSTEMS; ENERGY SOURCES; FOSSIL FUELS; FUELS; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGY; MATHEMATICS; MINERAL RESOURCES; ORGANIC MATTER; PALEOZOIC ERA; RESOURCES; ROCKS; SEDIMENTARY ROCKS; STOCHASTIC PROCESSES; TERRESTRIAL ECOSYSTEMS; WETLANDS; 011000* - Coal, Lignite, & Peat- Reserves, Geology, & Exploration
OSTI ID:
7042368
Research Organizations:
Aligarh Muslim University (India). Dept. of Geology
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: GERUA
Submitting Site:
CLA
Size:
Pages: 869-883
Announcement Date:

Journal Article:

Citation Formats

Casshyap, S M, Kreuser, T, and Wopfner, H. Analysis of cyclical sedimentation in the lower Permian Mchuchuma coalfield (South-West-Tanzania). Germany: N. p., 1987. Web.
Casshyap, S M, Kreuser, T, & Wopfner, H. Analysis of cyclical sedimentation in the lower Permian Mchuchuma coalfield (South-West-Tanzania). Germany.
Casshyap, S M, Kreuser, T, and Wopfner, H. 1987. "Analysis of cyclical sedimentation in the lower Permian Mchuchuma coalfield (South-West-Tanzania)." Germany.
@misc{etde_7042368,
title = {Analysis of cyclical sedimentation in the lower Permian Mchuchuma coalfield (South-West-Tanzania)}
author = {Casshyap, S M, Kreuser, T, and Wopfner, H}
abstractNote = {A statistical approach by a modified Markov process model was used to prove that the lower Permian coal measures of the Tanzanian Mchuchuma basin developed distinct cyclicities during deposition. From results the transition path of lithologic states typical for this coal sequence is as follows: (A) coarse sandstone, (B) medium sandstone, (C) fine-very fine sandstone, (D) shale, (E) mudstone, (F) coal or (E+F) and again (A) coarse sandstone. The majority of cycles is asymmetric (ABCDEF-ABC..) but symmetrical cycles are present as well (ABCDEFED). The statistical results concur with observed sedimentological evidence of depositional environment. Fining upward cycles correspond to the development of basal channel bars, changing into levees, then into back swamps which are topped by coal swamps. Frequent interbedding of coal and mudstone in the upper part of the coal measures calls for periodic flooding and flushing of fine clastics into coal-forming swamps causing interruption of peat formation. Cyclical deposition is explained by wandering channels in response to varying discharge and rate of deposition, their lateral frequent shifting caused the formation of asymmetrical cycles in this fluviodeltaic depositional model. 33 refs., 7 figs., 1 tab.}
journal = {Geol. Rundsch.; (Germany, Federal Republic of)}
volume = {76:3}
journal type = {AC}
place = {Germany}
year = {1987}
month = {Jan}
}