Nunivak Island, Alaska

2006 ◽  
pp. 63-73
Author(s):  
Ted Berry
Keyword(s):  
1984 ◽  
Vol 25 (2) ◽  
pp. 546-577 ◽  
Author(s):  
M. F. RODEN ◽  
F. A. FREY ◽  
D. M. FRANCIS

1968 ◽  
pp. 377-414 ◽  
Author(s):  
Joseph M. Hoare ◽  
William H. Condon ◽  
Allan Cox ◽  
G. Brent Dalrymple
Keyword(s):  

1997 ◽  
Vol 34 (6) ◽  
pp. 789-800 ◽  
Author(s):  
Vyacheslav V. Akinin ◽  
Julia Apt ◽  
Michael F. Roden ◽  
Don Francis ◽  
Elizabeth Moll-Stalcup

Nephelinites and basanites of the Enmelen volcanic field, Chukchi Peninsula, Russia, contain upper mantle xenoliths of relatively calcium- and magnesium-rich spinel lherzolites, pyroxenites, and megacrysts. The phase assemblages of the lherzolites require equilibration near 1.5 GPa, and calculated equilibration temperatures for most inclusions are in the range 850–1030 °C. These temperatures are similar to those calculated for lherzolite inclusions from other Bering Sea localities (Nunivak Island and Seward Peninsula) and are higher than temperatures expected for likely conductive geotherms beneath these volcanic fields. The relatively high temperatures may be the result of magma intrusion into the mantle lithosphere and consequent perturbation of the geotherm shortly before entrainment of the xenoliths in basalt. Two Enmelen lherzolites equilibrated at higher temperatures (1230–1240 °C) and provide further evidence for heating due to intrusive magmas. Some spinel lherzolite inclusions have flat rare earth element patterns and major and trace element abundances close to that of the bulk silicate earth. Based on the occurrence of similar fertile peridotites at Nunivak Island and Seward Peninsula, near-primitive mantle compositions appear to be common in the upper mantle beneath the Bering Sea. These peridotites may represent recent additions to the mantle lithosphere from mantle plumes related to the volcanism. Other Enmelen inclusions are relatively light rare earth element-enriched group I lherzolites metasomatized by a silicate melt, group II pyroxenites precipitated from a variety of melts, and augite megacrysts with convex-upward rare earth element patterns consistent with precipitation from the host basalts at high pressures.


Rangifer ◽  
2005 ◽  
Vol 25 (2) ◽  
pp. 107-121 ◽  
Author(s):  
Teresa A. Renecker ◽  
Lyle A. Renecker ◽  
Frank F. Mallory

Twenty-four reindeer (Rangifer tarandus) carcasses from male and female animals that ranged in age from calves to adults were purchased from Bering Sea Reindeer Products (BSRP), Nunivak Island, Alaska, USA. Preslaughter and abattoir procedures were observed and evaluated. Carcasses were split in half, weighed, and broke into wholesale primal cuts of chuck, rib, loin, and hindquarter. Each primal cut was weighed, boxed, and frozen. Each half carcass of primal cuts was later dissected into lean tissue, bone, and the three compartments of fat: subcutaneous, intermuscular, and peritoneal. A portion of the loin was collected from each animal in order to obtain data on pH and shear force. Sensory panel analysis was performed on loin steaks. Due to management and environmental effects, pH values were high and the meat was dark in colour. Carcasses from adult male reindeer contained significantly lower levels of fat than carcasses of adult females. Data indicated that yearling reindeer are of greatest economic value for meat production.


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