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Alex Konstantinou
8Publications
4H-index
56Citations
Publications 8
Newest
#1David H. MaloneH-Index: 9
#2Alex KonstantinouH-Index: 4
Last.John P. CraddockH-Index: 17
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Source
#1John P. Craddock (Macalester College)H-Index: 17
#2Suzanne D. Craddock (NAU: Northern Arizona University)H-Index: 1
Last.David H. Malone (ISU: Illinois State University)H-Index: 9
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Abstract We report the calcite twinning strain results of a traverse across the Grenville orogen from Parry Sound, Ontario (NW) to Ft. Ann, New York (SE), including the younger, adjacent Ordovician Taconic allochthon. Fifty four carbonates (marbles, calcite veins, Ordovician limestone) were collected resulting in 68 strain analyses on mechanically twinned calcite ( n = 2337 grains) across the Central Gneiss Belt (CGB; 3 samples), the Central Metasedimentary Belt (CMB; 27 samples), the Central Gr...
7 CitationsSource
#1John P. Craddock (Macalester College)H-Index: 17
#2David H. Malone (ISU: Illinois State University)H-Index: 9
Last.Stephen T. Johnston (U of A: University of Alberta)H-Index: 26
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Abstract The Proterozoic Grenville orogeny (~ 1300–980 Ma) reactivated the Archean-hosted Kapuskasing suture in Laurentia which then propagated west and south initiating the Keweenaw rift (1141–1085 Ma) which closed by thrust shortening at 1060 Ma. Late Proterozoic-Paleozoic sediments were then deformed in association with the amalgamation of Pangea in the late Paleozoic causing ~ 30 km of thrust shortening along this 4000 km paired (inverted) fault system, preserved by numerous 2nd and 3rd orde...
9 CitationsSource
#1John P. Craddock (Macalester College)H-Index: 17
#2Paul G. Fitzgerald (UR: University of Rochester)H-Index: 35
Last.Robert J. ThomasH-Index: 30
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Abstract Detrital zircons from the upper Cambrian-Devonian sandstones (Crashsite Group; n = 485) and Carboniferous tillite (Whiteout Conglomerate; n = 81) of the Ellsworth Mountains, Antarctica record a steady supply of Neoproterozoic (“Pan-African”) orogeny (~ 550–600 Ma), Grenville (~ 1000 Ma) and Neoarchean (~ 3000–3500 Ma) zircons into the northern marginal basin of Gondwana. The overlying Permian Glossopteris -bearing Polarstar Formation shales (n = 85) have the same zircon provenance as un...
10 CitationsSource
#1David H. Malone (ISU: Illinois State University)H-Index: 9
#2John P. Craddock (Macalester College)H-Index: 17
Last.Krista M. McGillivray (ISU: Illinois State University)H-Index: 1
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AbstractThis study uses detrital zircon U-Pb geochronology from shallow-water carbonates of the Bighorn Dolomite in Wyoming, USA, to provide robust evidence for long-distance eolian sediment transport during the Ordovician. The Bighorn Dolomite was deposited in a shallow-water carbonate platform that developed approximately 10° south of the Ordovician paleoequator on the western edge of Laurentia. The ages and textures of detrital zircons from the Bighorn indicate that the grains were transporte...
3 CitationsSource
#1David H. MaloneH-Index: 9
#2John P. CraddockH-Index: 17
Last.Krista M. McGillivrayH-Index: 1
view all 5 authors...
Source
#1John P. CraddockH-Index: 17
#2Alex KonstantinouH-Index: 4
Last.Erin WalkerH-Index: 2
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#1John P. Craddock (Macalester College)H-Index: 17
#2Alex KonstantinouH-Index: 4
Last.Erin Walker (Allegheny College)H-Index: 2
view all 8 authors...
AbstractWe report the ages of detrital zircons (207Pb/206Pb LA-ICPMS; ) from 12 clastic units that are representative of the Mesoproterozoic Midcontinent Rift System (MRS) of North America. Magmatism of the MRS spanned 1115–1085 Ma. The Puckwunge, Nopeming, and Bessemer basal sandstones and the Oronto and Bayfield Group sandstones received a predominance of Keweenaw Rift–Grenville (1.3–1.0 Ga) zircons but also contributions of Wolf River (1.45 Ga), Yavapai (1.75 Ga), Penokean (1.8 Ga), and Arche...
27 CitationsSource
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