Search Results - "Duncan Keppie, J"

Nd isotopic data indicating Oaxacan source of Ordovician granitoids in the Acatlán Complex, southern Mexico: Paleogeographic implications by Duncan Keppie, J., Dostal, Jaroslav, Li, Jianwei

“…Ordovician megacrystic granitoids intrude the Neoproterozoic-Paleozoic Acatlán Complex of southern Mexico, which consists of rift-passive margin, clastic rocks…”
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Nd isotopic and trace element constraints on the source of Silurian–Devonian mafic lavas in the Chaleur Bay Synclinorium of New Brunswick (Canada): Tectonic implications by Dostal, Jaroslav, Keppie, J. Duncan, Wilson, Reginald A.

“…Upper Silurian to Lower Devonian volcanic rocks of the Gander Zone, from the northern mainland Appalachians of northern New Brunswick, occur in the Chaleur Bay…”
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Synthesis and tectonic interpretation of the westernmost Paleozoic Variscan orogen in southern Mexico: From rifted Rheic margin to active Pacific margin by Keppie, J. Duncan, Dostal, Jaroslav, Murphy, J. Brendan, Nance, R. Damian

“…Paleozoic rocks in southern Mexico occur in two terranes, Oaxaquia (Oaxacan Complex) and Mixteca (Acatlán Complex) that appear to record: (1) Ordovician…”
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Comparative evolution of the Iapetus and Rheic Oceans: A North America perspective by Murphy, J. Brendan, Keppie, J. Duncan, Nance, R. Damian, Dostal, Jaroslav

“…Differences in the origin and evolution of the Iapetan and Rheic oceans profoundly affected the development of the Ouachitan–Appalachian–Variscan orogen. The…”
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Mid-Tertiary (25–21Ma) lamprophyres in NW Mexico derived from subduction-modified subcontinental lithospheric mantle in an extensional backarc environment following steepening of the Benioff zone by Orozco-Garza, Alberto, Dostal, Jaroslav, Keppie, J. Duncan, Paz-Moreno, Francisco A.

“…The mid-Tertiary lamprophyre dike swarm (~8km×2.5km in size) from Hermosillo (Sonora, NW Mexico) has calc–alkaline characteristics and includes NNW-striking,…”
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An autochthonous Avalonian basement source for the latest Ordovician Brenton Pluton in the Meguma terrane of Nova Scotia: U–Pb–Hf isotopic constraints and paleogeographic implications by Duncan Keppie, J., Gregory Shellnutt, J., Dostal, Jaroslav, Fraser Keppie, D.

“…The Ediacaran–Ordovician Meguma Supergroup was thrust over Avalonia basement prior to the intrusion of post-Acadian, ca. 370 Ma, S-type granitic batholiths…”
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Perspectives on lithospheric evolution through tectonomagmatic processes: a volume in honour of Jaroslav Dostal—an introduction by Shellnutt, J. Gregory, Murphy, J. Brendan, Greenough, John D., Keppie, J. Duncan

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Neoproterozoic?Early Paleozoic evolution of peri-Gondwanan terranes: implications for Laurentia-Gondwana connections by Murphy, J. Brendan, Pisarevsky, Sergei A., Nance, R. Damian, Keppie, J. Duncan

“…Issue Title: "The Avalonian-Cadomian Belt and related peri-Gondwana Terranes" Neoproterozoic tectonics is dominated by the amalgamation of the supercontinent…”
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Study of melt and a clast of 546 Ma magmatic arc rocks in the 65 Ma Chicxulub bolide breccia, northern Maya block, Mexico: western limit of Ediacaran arc peripheral to northern Gondwana by Keppie, J. Duncan, Dostal, Jaroslav, Norman, Marc, Urrutia-Fucugauchi, Jaime, Grajales-Nishimura, Manuel

“…The basement of the Maya block of eastern Mexico is generally covered by Mesozoic and Cenozoic platformal carbonate rocks. However, the 65.5 Ma Chicxulub…”
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The Yucatan, a Laurentian or Gondwanan fragment? Geophysical and palinspastic constraints by Keppie, D. Fraser, Keppie, J. Duncan

“…Current reconstructions suggest that the Yucatan block has Gondwanan provenance and orient the Yucatan E–W in the Ouachita embayment where it overlaps southern…”
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Ordovician–Silurian rift-passive margin on the Mexican margin of the Rheic Ocean overlain by Carboniferous–Permian periarc rocks: Evidence from the eastern Acatlán Complex, southern Mexico by Morales-Gámez, Miguel, Keppie, J. Duncan, Norman, Marc

“…In the Xayacatlán area of the Acatlán Complex in southern Mexico, several, N–S, fault-bounded packages of rocks occur (from west to east): (i) greenschist…”
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Exotic rifted passive margin of a back-arc basin off western Pangea: geochemical evidence from the Early Mesozoic Ayú Complex, southern Mexico by Helbig, Maria, Keppie, J. Duncan, Murphy, J. Brendan, Solari, Luigi A.

“…Recent detrital zircon studies of metamorphosed and polydeformed rocks of the early Mesozoic Ayú Complex in southern Mexico suggest an allochthonous origin…”
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Ordovician–earliest Silurian rift tholeiites in the Acatlán Complex, southern Mexico: Evidence of rifting on the southern margin of the Rheic Ocean by Keppie, J. Duncan, Dostal, Jaroslav, Miller, Brent V., Ramos-Arias, M.A., Morales-Gámez, Miguel, Nance, R. Damian, Murphy, J. Brendan, Ortega-Rivera, Amabel, Lee, J.W.K., Housh, T., Cooper, P.

“…The Acatlán Complex of southern Mexico is a vestige of a Paleozoic Ocean inferred to be either the Cambro-Ordovician Iapetus and/or the…”
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Mafic forearc cumulates and associated rocks in the central high-pressure belt of the Acatlán Complex of southern México: geochemical constraints by Galaz, Gonzalo, Keppie, J. Duncan, Murphy, J. Brendan

“…The high-pressure (HP) Piaxtla Suite at Tehuitzingo contains peridotites, gabbros, and serpentinized peridotites, as well as granitoids and metasedimentary…”
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Geochemistry and U-Pb protolith ages of eclogitic rocks of the Asís Lithodeme, Piaxtla Suite, Acatlán Complex, southern Mexico; tectonothermal activity along the southern margin of the Rheic Ocean by Murphy, J. Brendan, Keppie, J. Duncan, Nance, R. Damian, Miller, Brent V, Dostal, Jaroslav, Middleton, Matt, Fernández-Suárez, Javier, Jeffries, Teresa E, Storey, Craig D

“…Recent data indicating that the Piaxtla Suite (Acatlan Complex, southern Mexico) underwent eclogite-facies metamorphism and exhumation during the…”
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Complex geometry of the Cenozoic magma plumbing system in the central Sahara, NW Africa by Keppie, J. Duncan, Dostal, J., Murphy, J. B.

“…Topographic uplifts in the central Sahara occur in the Hoggar-Aïr and Tibesti-Gharyan swells that consist of Precambrian rocks overlain by Cenozoic volcanic…”
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Evolution of the Rheic Ocean by Nance, R. Damian, Gutiérrez-Alonso, Gabriel, Keppie, J. Duncan, Linnemann, Ulf, Murphy, J. Brendan, Quesada, Cecilio, Strachan, Rob A., Woodcock, Nigel H.

“…The Rheic Ocean, which separated Laurussia from Gondwana following the closure of Iapetus, is arguably the most important ocean of the Palaeozoic. Its suture…”
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Silurian U Pb zircon intrusive ages for the Red River anorthosite (northern Cape Breton Island): Implications for the Laurentia-Avalonia boundary in Atlantic Canada by Keppie, J. Duncan, Shellnutt, J. Gregory, Dostal, Jaroslav, Keppie, D. Fraser

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An alternative Pangea reconstruction for Middle America with the Chortis Block in the Gulf of Mexico: tectonic implications by Keppie, D. Fraser, Keppie, J. Duncan

“…Understanding Pangea breakup requires a robust reconstruction, and this article focuses on the Middle America sector of the supercontinent. Although most…”
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Old and juvenile source of Paleozoic and Mesozoic basaltic magmas in the Acatlán and Ayú complexes, Southern Mexico: Nd isotopic constraints by Keppie, J. Duncan, Dostal, Jaroslav, Shellnutt, J. Gregory

“…The Neoproterozoic–Paleozoic Acatlán Complex and the Mesozoic Ayú Complex of southern Mexico consist of clastic rocks and rift-related igneous rocks inferred…”
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