Carboniferous and Permian island-arc deposits of the eastern Klamath terrane, California

1990 ◽  
pp. 193-200 ◽  
Author(s):  
Rodney Watkins
Keyword(s):  
Island Arc

Triassic sponges (Sphinctozoa) from Hells Canyon, Oregon

1988 ◽  
Vol 62 (03) ◽  
pp. 419-423 ◽  
Author(s):  
Baba Senowbari-Daryan ◽  
George D. Stanley
Keyword(s):  
Endemic Species ◽  
Upper Triassic ◽  
Island Arc ◽  
Tropical Island ◽  
The Family ◽  
Wallowa Terrane ◽  
Unique Condition ◽  
Hells Canyon

Two Upper Triassic sphinctozoan sponges of the family Sebargasiidae were recovered from silicified residues collected in Hells Canyon, Oregon. These sponges areAmblysiphonellacf.A. steinmanni(Haas), known from the Tethys region, andColospongia whalenin. sp., an endemic species. The latter sponge was placed in the superfamily Porata by Seilacher (1962). The presence of well-preserved cribrate plates in this sponge, in addition to pores of the chamber walls, is a unique condition never before reported in any porate sphinctozoans. Aporate counterparts known primarily from the Triassic Alps have similar cribrate plates but lack the pores in the chamber walls. The sponges from Hells Canyon are associated with abundant bivalves and corals of marked Tethyan affinities and come from a displaced terrane known as the Wallowa Terrane. It was a tropical island arc, suspected to have paleogeographic relationships with Wrangellia; however, these sponges have not yet been found in any other Cordilleran terrane.

Volcanoes of the southwestern extension of the active Mariana island arc: New swath-mapping and geochemical studies

Island Arc ◽  
1998 ◽  
Vol 7 (3) ◽  
pp. 596-607
Author(s):  
F RYER ◽  
S UJIMOTO ◽  
S EKINE ◽  
J OHNSON ◽  
K ASAHARA ◽  
...  
Keyword(s):  
Island Arc ◽  
Swath Mapping ◽  
Geochemical Studies ◽  
Mariana Island Arc

Composite Devonian island-arc batholith in the northern Sierra Nevada, California

1988 ◽  
Vol 100 (3) ◽  
pp. 446-457 ◽  
Author(s):  
RICHARD E. HANSON ◽  
JASON B. SALEEBY ◽  
RICHARD A. SCHWEICKERT
Keyword(s):  
Sierra Nevada ◽  
Island Arc

ID-TIMS U-PB GEOCHRONOLOGY OF LOWER CRUSTAL CUMULATE COMPLEXES IN THE KOHISTAN TERRANE, NORTH-EAST PAKISTAN: IMPLICATIONS FOR ISLAND ARC FORMATION

2016 ◽  
Author(s):  
Jack Edward Stirling ◽  
◽  
Steven W. Denyszyn ◽  
Marco L. Fiorentini ◽  
Robert R. Loucks
Keyword(s):  
Island Arc ◽  
North East ◽  
Lower Crustal

A REVIEW OF CHAITENIA: A DEVONIAN OCEANIC ISLAND ARC ACCRETED TO PATAGONIA SOUTH OF CHILENIA, SOUTH AMERICA

2019 ◽  
Author(s):  
C. Mark Fanning ◽  
◽  
Francisco Hervé ◽  
Mauricio N. Calderón ◽  
Robert J. Pankhurst ◽  
...  
Keyword(s):  
South America ◽  
Oceanic Island ◽  
Island Arc
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