Bibliographic Citation
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Title | Calcrete and coal in late Carboniferous cyclothems of Nova Scotia, Canada. Climate and sea-level changes linked |
Creator/Author | Tandon, S.K. (Univ. of Delhi (India)) ; Gibling, M.R. (Dalhousie Univ., Halifax, Nova Scotia (Canada)) |
Publication Date | 1994 Aug 01 |
OSTI Identifier | OSTI ID: 7199055 |
Other Number(s) | ISSN0091-7613; CODEN: GLGYBA |
Resource Type | Journal Article |
Resource Relation | Geology ; Vol/Issue: 22:8 |
Subject | 011000 -- Coal, Lignite, & Peat-- Reserves, Geology, & Exploration ;580000 -- Geosciences; CALCRETES-- GEOLOGY;COAL DEPOSITS-- GEOLOGY; CARBONIFEROUS PERIOD;CLIMATIC CHANGE;NOVA SCOTIA;SEA LEVEL;SOILS |
Related Subject | CANADA;CONGLOMERATES;DEVELOPED COUNTRIES;GEOLOGIC AGES;GEOLOGIC DEPOSITS;LEVELS;MINERAL RESOURCES;NORTH AMERICA;PALEOZOIC ERA;RESOURCES;ROCKS;SEDIMENTARY ROCKS |
Description/Abstract | Modern tropical peats require continuity of precipitation for accumulation, whereas calcretes and calcic vertisols require strongly seasonal conditions.^The 20-30-m-thick cyclothems of the Sydney basin, Nova Scotia, Canada, show a systematic alternation of coals and other hydromorphic paleosols with calcretes and calcic vertisols.^This implies strong variation in seasonality during the duration of a cyclothem, estimated at 200 ka.^In at least one cyclothem, calcic paleosols formed on an interfluve adjacent to a paleovalley cut through marine strata, suggesting that a more seasonal and probably drier climate prevailed during sea-level lowstand.^The calcic paleosols are estimated to have formed during periods of 10[sup 4] yr, possibly indicative of partial control by obliquity and precessional cycles.^27 refs., 5 figs., 1 tab. |
Country of Publication | United States |
Language | English |
Format | Pages: 755-758 |
System Entry Date | 2001 May 13 |
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