Calcrete and coal in late Carboniferous cyclothems of Nova Scotia, Canada. Climate and sea-level changes linked

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Geology; (United States)

DOI:https://doi.org/10.1130/0091-7613(1994)022<0755:CACILC>2.3.CO;2· OSTI ID:7199055

Tandon, S K ^[1]; Gibling, M R ^[2]

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1. Univ. of Delhi (India)
2. Dalhousie Univ., Halifax, Nova Scotia (Canada)

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.

• OSTI ID: 7199055
• Journal Information: Geology; (United States), Journal Name: Geology; (United States) Vol. 22:8; ISSN 0091-7613; ISSN GLGYBA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
011000* -- Coal
Lignite
&amp; Peat-- Reserves
Geology
&amp; Exploration
58 GEOSCIENCES
580000 -- Geosciences
CALCRETES
CANADA
CARBONIFEROUS PERIOD
CLIMATIC CHANGE
COAL DEPOSITS
CONGLOMERATES
DEVELOPED COUNTRIES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
LEVELS
MINERAL RESOURCES
NORTH AMERICA
NOVA SCOTIA
PALEOZOIC ERA
RESOURCES
ROCKS
SEA LEVEL
SEDIMENTARY ROCKS
SOILS