Emplacement age of post-tectonic granites in southern Guinea (West Africa) and the peninsular Florida subsurface: Implications for origins of southern Appalachian exotic terranes

Dallmeyer, R. D.; Caen-Vachette, M.; Villeneuve, Michel

doi:10.1130/0016-7606(1987)99<87:eaopgi>2.0.co;2

Cited by 53 publications

(23 citation statements)

References 9 publications

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“…Peninsular Florida is underlain by a late Neoproterozoic-Cambrian (535-510 Ma) basement unconformably overlain by undeformed Ordovician-Devonian sedimentary rocks containing high-latitude trilobite and acritarch fauna of Gondwanan affinity, which have generally been correlated with the Bove basin of West Africa (Whittington and Hughes, 1974;Cramer and Diez, 1974;Dallmeyer, 1987;Dallmeyer et al, 1987). This assignment is consistent with paleomagnetic data (Opdyke et al, 1987).…”

Section: Floridamentioning

confidence: 56%

Odyssey of terranes in the Iapetus and Rheic oceans during the Paleozoic

Keppie¹,

Ramos²

1999

Laurentia-Gondwana Connections Before Pangea

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Section: Floridamentioning

confidence: 56%

Odyssey of terranes in the Iapetus and Rheic oceans during the Paleozoic

Keppie¹,

Ramos²

1999

Laurentia-Gondwana Connections Before Pangea

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“…A large component was derived from bedrock sources of Grenvillian age (1250-900 Ma) of the Oaxaquian subcontinent (Ortega-Gutiérrez et al, 1995) or possibly reworked from Ouachita rock assemblages. A potential source for Pan-African zircons exists in basement rocks of the Yucatan Peninsula (then positioned against the Texas and Louisiana coast (MolinaGarza et al, 1992), Coahuila (Lopez et al, 2001), southeast Texas, and Florida (Dallmeyer et al, 1987;Mueller et al, 1994), although they may also have been re cycled from Paleozoic strata of the Ouachita orogen. Detrital zircons in Triassic rocks in north-central and northeastern Mexico show some similarity with Triassic rocks of the Dockum Group.…”

Section: Discussionmentioning

confidence: 97%

Late Triassic stratigraphy and facies from northeastern Mexico: Tectonic setting and provenance

et al. 2010

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Triassic strata in northeastern Mexico distributed over an area of ~120,000 km 2 have received relatively little attention in paleogeographic and tectonic reconstructions of western equatorial Pangea. Triassic marine sequences of the Zacatecas Formation in western San Luis Potosí and Zacatecas constitute facies corresponding to different sections of a submarine fan system previously described as the Potosí fan and were deposited on the paleo-Pacifi c margin of Pangea. New geochronologic data and fi eld observations permit revision of the stratigraphy from Late Triassic to Early Jurassic fl uvial deposits of the Huizachal Group that crop out in Nuevo León and Tamaulipas and indicate a link between the lower part of this succession (Triassic strata) and the Potosí fan. This work proposes and defi nes the El Alamar formation, which represents the only Triassic strata of the Huizachal Group (lower part of the Late Triassic-Early Jurassic La Boca Formation), and is interpreted as a continental succession that records a major fl uvial system draining equatorial Pangea and fl owing west into the Potosí fan. Petrographic and geochemical studies indicate that both Triassic successions, the Zacatecas Formation (marine) and El Alamar formation (continental) have continental block and recycled orogenic provenances. U-Pb detrital zircon geochronology by laser ablationmulticollector -inductively coupled plasmamass spectrometry show three main zircon age populations: (1) Grenvillian (1300-900 Ma); (2) Pan-African (700-500 Ma); and (3) dominant Permian-Triassic (280-240 Ma). The presence of these zircons displays evidence of sources in GrenvillianOaxaquia block, Pan-African terrains such as Yucatan and southeastern Texas, and a prominent contribution from the PermianTriassic east Mexico magmatic arc. Notable is the absence of detrital contributions from the southwestern North American craton. The geochronological data thus argue against proposed southeastward displacement of Triassic successions and their basement to their current position as proposed by the Mojave-Sonora megashear hypothesis. We propose that continental Triassic strata were deposited in eastern Mexico before the opening of the Gulf of Mexico basin, and are thus autochthonous and transported detritus toward the ancient Pacifi c margin into the Potosí fan, which is also autochthonous.

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“…Palaeogeographic reconstruction suggests that the closest Peri-Gondwanan terranes to the Marampa Group were Florida (Dallmeyer et al, 1987), Carolina and New Brunswick (Nance et al, 2008;. The southern portion of New Brunswick records detrital zircon ages of 2.6 Ga, 2.0-1.9 Ga, 1.8 Ga, 1.6-1.5 Ga, 1.3 Ga and 1.2-1.0 Ga (Keppie and Dostal, 1998) compatible with ages of the Amazonian Craton and mimicking detrital zircon populations in the Marampa Group.…”

Section: Marampa Groupmentioning

confidence: 99%

“…Based on limited K-Ar data, Macfarlane (1981), Dallmeyer (1987) and Villeneuve (2008) regarded the Kasila Group as an Archaean supracrustal succession reworked during the Neoproterozoic-Early Cambrian. However, the age data available on the Kasila Group are limited to K-Ar cooling ages on hornblende and biotite between 555 and 510 Ma (Table 5).…”

Section: Kasila Groupmentioning

confidence: 99%