Geochronology of the Arkanas Alkaline Province, Southeastern United States

Eby, G. Nelson and Vasconcelos, Paulo (2009) Geochronology of the Arkanas Alkaline Province, Southeastern United States. The Journal of Geology, 117 6: 615-626. doi:10.1086/605779

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Author Eby, G. Nelson
Vasconcelos, Paulo
Title Geochronology of the Arkanas Alkaline Province, Southeastern United States
Journal name The Journal of Geology   Check publisher's open access policy
ISSN 0022-1376
Publication date 2009
Year available 2009
Sub-type Article (original research)
DOI 10.1086/605779
Open Access Status File (Publisher version)
Volume 117
Issue 6
Start page 615
End page 626
Total pages 12
Editor Barbara J. Sivertsen
Place of publication Chicago, IL, United States
Publisher University of Chicago Press
Collection year 2010
Language eng
Subject 0403 Geology
970104 Expanding Knowledge in the Earth Sciences
Formatted abstract
The Arkansas alkaline province (AAP) consists of intrusive bodies ranging in lithology from carbonatite and lamproite through nepheline syenite. Apatite and titanite fission-track ages fall into two groups-101-94 Ma and ∼88 Ma. New 40Ar/39Ar ages and those reported in the literature define a third age group of ∼106 Ma. Apatite and titanite fissiontrack ages are concordant, indicating rapid cooling due to the emplacement of these intrusions at high levels during a time of regional uplift. There is a relationship between age and petrology: (1) lamproites are emplaced at ∼106 Ma, (2) carbonatites and associated silica-undersaturated rocks are emplaced between 101 and 94 Ma, and (3) large nepheline syenite bodies are emplaced at ∼88 Ma. Chemical and isotopic data support the inference that the lamproites are derived from subcontinental lithosphere, while the other sequences are derived from the asthenosphere. The ages for the AAP and other conflicting information do not support the hypothesis that the AAP was formed by the passage of the North American plate over the Bermuda hotspot. A more likely explanation is that the magmatism was related to extension and reactivation of faults associated with the Mississippi graben.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
2010 Higher Education Research Data Collection
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 26 Apr 2010, 21:27:23 EST by Tracy Paroz on behalf of School of Earth Sciences