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Florida as an exotic terrane: Paleomagnetic and geochronologic investigation of lower Paleozoic rocks from the subsurface of Florida

1987; Geological Society of America; Volume: 15; Issue: 10 Linguagem: Inglês

10.1130/0091-7613(1987)15 2.0.co;2

1943-2682

Neil D. Opdyke, D. S. Jones, Bruce J. MacFadden, Douglas L. Smith, Paul A. Mueller, Robert Shuster,

Water Quality and Resources Studies

Research Article| October 01, 1987 Florida as an exotic terrane: Paleomagnetic and geochronologic investigation of lower Paleozoic rocks from the subsurface of Florida Neil D. Opdyke; Neil D. Opdyke 1Department of Geology, University of Florida, Gainesville, Florida 32611 Search for other works by this author on: GSW Google Scholar Douglas S. Jones; Douglas S. Jones 2Florida State Museum, University of Florida, Gainesville, Florida 32611 Search for other works by this author on: GSW Google Scholar Bruce J. MacFadden; Bruce J. MacFadden 2Florida State Museum, University of Florida, Gainesville, Florida 32611 Search for other works by this author on: GSW Google Scholar Douglas L. Smith; Douglas L. Smith 3Department of Geology, University of Florida, Gainesville, Florida 32611 Search for other works by this author on: GSW Google Scholar Paul A. Mueller; Paul A. Mueller 3Department of Geology, University of Florida, Gainesville, Florida 32611 Search for other works by this author on: GSW Google Scholar Robert D. Shuster Robert D. Shuster 3Department of Geology, University of Florida, Gainesville, Florida 32611 Search for other works by this author on: GSW Google Scholar Geology (1987) 15 (10): 900–903. https://doi.org/10.1130/0091-7613(1987)15 2.0.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Neil D. Opdyke, Douglas S. Jones, Bruce J. MacFadden, Douglas L. Smith, Paul A. Mueller, Robert D. Shuster; Florida as an exotic terrane: Paleomagnetic and geochronologic investigation of lower Paleozoic rocks from the subsurface of Florida. Geology 1987;; 15 (10): 900–903. doi: https://doi.org/10.1130/0091-7613(1987)15 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract New geophysical and geochronological data are presented for a lower Paleozoic subsurface (794–827 m depth) sedimentary core recovered from Alachua County, northern Florida. Paleomagnetic data from samples taken at various depths along the core indicate that a high unblocking temperature component is isolated during thermal demagnetization between 400 and 600 °C. The mean inclination of this component is 65°, yielding a paleolatitude of 49°. Previous paleogeographic reconstructions for the early Paleozoic of North America place Florida at a significantly lower paleolatitude (∼28°), whereas our data are consistent with a Gondwanian fit (∼50°–60°). U/Pb isotopic systematics of zircons separated from core samples yield five dates ranging from ca. 1650 to 1800 Ma. Because there are no known source rocks of this antiquity in southeastern North America, the most probable provenance for these detrital zircons is either Africa or South America. These two 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. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.