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Temporal distribution of carbonatites

Jaen Veizer, Keith Bell and Siegfried L. Jansen
Temporal distribution of carbonatites
Geology (Boulder) (December 1992) 20 (12): 1147-1149


About half of the 330 occurrences listed in the global inventory of carbonatites have been dated, mostly by the K-Ar method, and they fall into groups that appear to be temporally and spatially linked to major orogenic events. Overall, however, the temporal pattern is one of exponential increase in frequency with time. This secular trend has been interpreted as an increase in carbonatite activity in the course of terrestrial evolution. In an alternative interpretation, the observed trend may be viewed as an artifact of preservation, because the probability of preservation decreases exponentially with increasing age of the crustal segments. The secular trend for carbonatites since at least 1.8 Ga, the time that continental crust attained its near-modern extent, is compatible with a steady-state process of carbonatite generation and destruction that has a half-life of approximately 445 m.y. The most acceptable model for the temporal distribution of carbonatites involves a combination of orogenic activity and erosional dispersal.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 20
Serial Issue: 12
Title: Temporal distribution of carbonatites
Affiliation: University of Ottawa, Ottawa-Carleton Geoscience Centre, Derry/Rust Research Unit, Ottawa, ON, Canada
Pages: 1147-1149
Published: 199212
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 15
Accession Number: 1992-060461
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Carleton University, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1992
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