Florida as an exotic terrane: paleomagnetic and geochronologic investigation of lower Paleozoic rocks from the subsurface of Florida ( USA).

N. D. Opdyke, D. S. Jones, B. J. Macfadden, D. L. Smith, P. A. Mueller, R. D. Shuster

Research output: Contribution to journalArticle

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Abstract

Paleomagnetic data from samples taken at various depths along a core from Alachua County, N Florida, indicate that a high unblocking temperature component is isolated during thermal demagnetization between 400 and 600oC. The mean inclination of this component is 65o, yielding a paleolatitude of 49o. Previous paleogeographic reconstructions for the early Paleozoic of North America place Florida at a significantly lower paleolatitude (approx 28o), whereas our data are consistent with a Gondwanian fit (approx 50-60o). U/Pb isotopic systematics of zircons separated from core samples yield 5 dates ranging from approx 1650-1800Ma. The most probable provenance for these detrital zircons is either Africa or South America. These 2 new lines of geologic data provide strong evidence confirming previous suggestions that Florida was part of Gondwana during the early Paleozoic and that its current configuration is that of an exotic terrane sutured to North America during the fragmentation of Pangea.-from Authors

Original languageEnglish (US)
Pages (from-to)900-903
Number of pages4
JournalGeology
Volume15
Issue number10
DOIs
StatePublished - Jan 1 1987

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terrane
paleolatitude
Paleozoic
zircon
rock
Pangaea
demagnetization
Gondwana
provenance
fragmentation
North America
Africa
South America

ASJC Scopus subject areas

  • Geology

Cite this

Florida as an exotic terrane : paleomagnetic and geochronologic investigation of lower Paleozoic rocks from the subsurface of Florida ( USA). / Opdyke, N. D.; Jones, D. S.; Macfadden, B. J.; Smith, D. L.; Mueller, P. A.; Shuster, R. D.

In: Geology, Vol. 15, No. 10, 01.01.1987, p. 900-903.

Research output: Contribution to journalArticle

Opdyke, N. D. ; Jones, D. S. ; Macfadden, B. J. ; Smith, D. L. ; Mueller, P. A. ; Shuster, R. D. / Florida as an exotic terrane : paleomagnetic and geochronologic investigation of lower Paleozoic rocks from the subsurface of Florida ( USA). In: Geology. 1987 ; Vol. 15, No. 10. pp. 900-903.
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