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A fluvioglacial and gaciolacustrine deltaic depositional model for Permo-Carboniferous coals of the northeastern Karoo Basin, South Africa

Journal Article:

Abstract

With the northward retreat of the late Palaeozoic Gondwana ice sheet a series of glacial valleys, partially filled with diamictite, dominated the landscape along the northern edge of the Karoo basin in South Africa. Consequent outwash sediments accumulated as fluvioglacial and glaciolacustrine deltaic deposits. Density underflow generated turbidity currents from which bottomset sediments were deposited. These comprise distal varved siltstones and shales, stratified pebbly-mudstone with dropstones, and proximal ripple drift cross-laminated sandstones and siltstones. Overlying outwash plain conglomerates and sandstones constitute the topset deposits. Upon abandonment of the outwash plain, shallow-rooted Arctic vegetation developed. Resulting peats exceeded 10 m in thickness and constituted precursors to coal seams in which variations in ash content are attributed to overbank splaying from recognisable anastomosing channels within the coal swamps. This study has illustrated a characteristic paraglacial sedimentation sequence, maximum depositional rates occur immediately after glacial retreat followed by decelerating sedimentation rates through time, leading finally to the development of extensive peats. (29 refs.)
Publication Date:
Jan 01, 1979
Product Type:
Journal Article
Reference Number:
EDB-82-136675
Resource Relation:
Journal Name: Palaeogeogr., Palaeoclimatol., Palaeoecol.; (Netherlands); Journal Volume: 27:1/2
Subject:
01 COAL, LIGNITE, AND PEAT; COAL DEPOSITS; GEOLOGY; SOUTH AFRICA; DEPOSITION; GEOLOGIC DEPOSITS; ORIGIN; PEAT; SEDIMENTATION; SEDIMENTS; STRATIGRAPHY; AFRICA; ENERGY SOURCES; FOSSIL FUELS; FUELS; MINERAL RESOURCES; ORGANIC MATTER; RESOURCES; 011000* - Coal, Lignite, & Peat- Reserves, Geology, & Exploration
OSTI ID:
5177495
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: PPPYA
Submitting Site:
HEDB
Size:
Pages: 67-84
Announcement Date:
Jul 01, 1982

Journal Article:

Citation Formats

Smith G, Le Blanc, and Eriksson, K A. A fluvioglacial and gaciolacustrine deltaic depositional model for Permo-Carboniferous coals of the northeastern Karoo Basin, South Africa. Netherlands: N. p., 1979. Web.
Smith G, Le Blanc, & Eriksson, K A. A fluvioglacial and gaciolacustrine deltaic depositional model for Permo-Carboniferous coals of the northeastern Karoo Basin, South Africa. Netherlands.
Smith G, Le Blanc, and Eriksson, K A. 1979. "A fluvioglacial and gaciolacustrine deltaic depositional model for Permo-Carboniferous coals of the northeastern Karoo Basin, South Africa." Netherlands.
@misc{etde_5177495,
title = {A fluvioglacial and gaciolacustrine deltaic depositional model for Permo-Carboniferous coals of the northeastern Karoo Basin, South Africa}
author = {Smith G, Le Blanc, and Eriksson, K A}
abstractNote = {With the northward retreat of the late Palaeozoic Gondwana ice sheet a series of glacial valleys, partially filled with diamictite, dominated the landscape along the northern edge of the Karoo basin in South Africa. Consequent outwash sediments accumulated as fluvioglacial and glaciolacustrine deltaic deposits. Density underflow generated turbidity currents from which bottomset sediments were deposited. These comprise distal varved siltstones and shales, stratified pebbly-mudstone with dropstones, and proximal ripple drift cross-laminated sandstones and siltstones. Overlying outwash plain conglomerates and sandstones constitute the topset deposits. Upon abandonment of the outwash plain, shallow-rooted Arctic vegetation developed. Resulting peats exceeded 10 m in thickness and constituted precursors to coal seams in which variations in ash content are attributed to overbank splaying from recognisable anastomosing channels within the coal swamps. This study has illustrated a characteristic paraglacial sedimentation sequence, maximum depositional rates occur immediately after glacial retreat followed by decelerating sedimentation rates through time, leading finally to the development of extensive peats. (29 refs.)}
journal = {Palaeogeogr., Palaeoclimatol., Palaeoecol.; (Netherlands)}
volume = {27:1/2}
journal type = {AC}
place = {Netherlands}
year = {1979}
month = {Jan}
}