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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 Date1994 Aug 01
OSTI IdentifierOSTI ID: 7199055
Other Number(s)ISSN0091-7613; CODEN: GLGYBA
Resource TypeJournal Article
Resource RelationGeology ; Vol/Issue: 22:8
Subject011000 -- Coal, Lignite, & Peat-- Reserves, Geology, & Exploration ;580000 -- Geosciences; CALCRETES-- GEOLOGY;COAL DEPOSITS-- GEOLOGY; CARBONIFEROUS PERIOD;CLIMATIC CHANGE;NOVA SCOTIA;SEA LEVEL;SOILS
Related SubjectCANADA;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 PublicationUnited States
LanguageEnglish
FormatPages: 755-758
System Entry Date2001 May 13

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