Silurian Gastropoda from the Alexander Terrane, southeast Alaska

2008 ◽  
Author(s):  
David M. Rohr ◽  
Robert B. Blodgett
Keyword(s):  
Southeast Alaska ◽  
Alexander Terrane

scholarly journals Tectonic history of the eastern edge of the Alexander Terrane, southeast Alaska

Tectonics ◽  
1992 ◽  
Vol 11 (3) ◽  
pp. 586-602 ◽  
Author(s):  
Charles M. Rubin ◽  
Jason B. Saleeby
Keyword(s):  
Southeast Alaska ◽  
Tectonic History ◽  
History Of ◽  
Eastern Edge ◽  
Alexander Terrane

Scaphopoda from the Alexander Terrane, Southeast Alaska—The first occurrence of Scaphopoda in the Silurian

Palaeoworld ◽  
2006 ◽  
Vol 15 (2) ◽  
pp. 211-215 ◽  
Author(s):  
David M. Rohr ◽  
Robert B. Blodgett ◽  
James Baichtal
Keyword(s):  
Southeast Alaska ◽  
First Occurrence ◽  
Alexander Terrane

Detrital zircon geochronology of the Taku terrane, southeast Alaska

2002 ◽  
Vol 39 (6) ◽  
pp. 921-931 ◽  
Author(s):  
George E Gehrels
Keyword(s):  
Detrital Zircon ◽  
Detrital Zircons ◽  
Zircon Geochronology ◽  
The West ◽  
Southeast Alaska ◽  
Detrital Zircon Geochronology ◽  
Tectonic Boundary ◽  
Alexander Terrane

U–Pb geochronologic studies have been conducted on 60 detrital zircon grains from Permian(?) and Triassic metasandstones of the Taku terrane in central southeast Alaska. The resulting ages are mainly in the range 349–387 Ma, with five additional grains that yield probable ages ranging from ~906 to ~2643 Ma. These ages are similar to the ages of detrital zircons in Carboniferous and older rocks of the Yukon–Tanana terrane, which lies directly east of the Taku terrane. In contrast, these ages are different from the ages of detrital zircon grains in the Alexander terrane to the west. The data are accordingly consistent with models in which the Taku terrane is a western component of the Stikine and Yukon–Tanana terranes, and that this crustal fragment is separated by a fundamental tectonic boundary from rocks of the Alexander and Wrangellia terranes to the west.

Systematic analysis of Upper Triassic silicified scleractinian corals from Wrangellia and the Alexander Terrane, Alaska and British Columbia

2008 ◽  
Vol 82 (3) ◽  
pp. 470-491 ◽  
Author(s):  
Andrew H. Caruthers ◽  
George D. Stanley
Keyword(s):  
New Genus ◽  
Scleractinian Corals ◽  
Upper Triassic ◽  
Systematic Analysis ◽  
Southeast Alaska ◽  
Taxonomic Affinity ◽  
Acid Processing ◽  
Wallowa Terrane ◽  
Systematic Identification ◽  
Alexander Terrane

Acid processing allowed systematic identification of 458 Upper Triassic silicified scleractinian corals (20 genera, 47 species) from the Alexander terrane (southeast Alaska) and Wrangellia (Wrangell Mountains, southern Alaska and Vancouver Island, Canada). Coral faunas, here presented, show taxonomic affinity with coeval collections from other Cordilleran terranes, specifically the Wallowa terrane (northeastern Oregon and Idaho) and Peru (South America) as well as the distant Tethys region. Genera from the Alexander terrane include: Kompsasteria Roniewicz, Gablonzeria Cuif, Cuifia Melnikova, Paracuifia Melnikova, Distichophyllia Cuif, Retiophyllia Cuif, Kuhnastraea Cuif, Margarosmilia Volz, Distichomeandra Cuif, Astraeomorpha Reuss, Pamiroseris Melnikova, Crassistella Roniewicz, Stylophyllum Frech, and Meandrostylis Frech. Genera from Wrangellia include: Gablonzeria Cuif, Distichophyllia Cuif, Retiophyllia Cuif, Kuhnastraea Cuif, Margarosmilia Volz, Distichomeandra Cuif, Astraeomorpha Reuss, Parastraeomorpha Roniewicz, Chondrocoenia Roniewicz, Pamiroseris Melnikova, Crassistella Roniewicz, Ampakabastraea? Alloiteau, Recticostastraea Stanley and Whalen, Meandrostylis Frech, Anthostylis Roniewicz, and the new genus Campesteria n. gen. New species include: Gablonzeria grandiosa n. sp., Paracuifia smithi n. sp., Paracuifia jennieae n. sp., P. anomala n. sp., Retiophyllia dendriformis n. sp., R. obtusa n. sp., and Campesteria prolixia n. sp.

scholarly journals U-Pb and Hf isotope analysis of detrital zircons from Paleozoic strata of the southern Alexander terrane (southeast Alaska)

Lithosphere ◽  
2015 ◽  
Vol 8 (1) ◽  
pp. 83-96 ◽  
Author(s):  
Chelsi White ◽  
George E. Gehrels ◽  
Mark Pecha ◽  
Dominique Giesler ◽  
Intan Yokelson ◽  
...  
Keyword(s):  
Isotope Analysis ◽  
Detrital Zircons ◽  
Hf Isotope ◽  
Southeast Alaska ◽  
Alexander Terrane

The first Upper Triassic silicified hypercalcified sponges from the Alexander Terrane, Gravina island and Keku Strait, Southeast Alaska

2008 ◽  
Vol 82 (2) ◽  
pp. 344-350 ◽  
Author(s):  
Baba Senowbari-Daryan ◽  
Andrew H. Caruthers ◽  
George D. Stanley
Keyword(s):  
North America ◽  
Great Basin ◽  
Upper Triassic ◽  
Western North America ◽  
Southeast Alaska ◽  
Cassian Formation ◽  
Nayband Formation ◽  
Northwestern Mexico ◽  
Alexander Terrane

This paper describes the first silicified Upper Triassic (Early Norian) hypercalcified sponges known from the Alexander terrane, southeast Alaska. Sponges consist of five taxa from the Cornwallis Limestone of Keku Strait, southeast Alaska: Amblysiphonella Steinmann, Parauvanella Senowbari-Daryan and Di Stefano, Nevadathalamia cylindrica (Seilacher), N. minima n. sp., and Stellispongia (S. cf. subsphaerica Dieci, Antonacci, and Zardini). The hypercalcified sponges of the Alexander terrane as described in this paper provide paleogeographic linkage with other far-flung terranes of western North America, namely the Western Great Basin of Nevada, Stikinia of the Yukon, as well as the Antimonio terrane of northwestern Mexico. In addition, Parauvanella cf. ferdowensis is known from the Upper Triassic Nayband Formation, Iran. Finally Stellispongia cf. subsphaerica is known from the Upper Carnian Cassian Formation of the Dolomite Alps.Sponges (particularly hypercalcified inozoans, sphinctozoans, chaetetids, and sponge-like organisms) are known worldwide from many Upper Triassic reef and nonreef sites. Although Upper Triassic deposits within the Cordilleran terranes and cratonal North America do not typically contain reeflike buildups, hypercalcifying sponge-like organisms were noted as occurring as part of the intricate paleoecological structure within a biostrome along the western shoreline of Gravina Island, southeast Alaska (southern Alexander terrane). This is in contrast to Keku Strait, southeast Alaska (central Alexander terrane), where hypercalcified sponges were identified from limestone beds within nonreef deposits.

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