Early Proterozoic U-Pb Zircon Ages from Basement Gneiss at the Solovetsky Archipelago, White Sea, Russia

2012 ◽  
Vol 03 (02) ◽  
pp. 289-296 ◽  
Author(s):  
Stephan Schuth ◽  
Victor I. Gornyy ◽  
Jasper Berndt ◽  
Sergei S. Shevchenko ◽  
Alexandr F. Karpuzov ◽  
...  
Keyword(s):  
White Sea ◽  
Early Proterozoic ◽  
Basement Gneiss

Postcollisional cooling of the Penokean orogen in east-central Minnesota

1993 ◽  
Vol 30 (5) ◽  
pp. 913-917 ◽  
Author(s):  
Daniel K. Holm ◽  
Timothy B. Holst ◽  
Daniel R. Lux
Keyword(s):  
Lake Superior ◽  
Tectonic Activity ◽  
East Central ◽  
Early Proterozoic ◽  
Granite Emplacement ◽  
Internal Zone ◽  
Basement Gneiss ◽  
Rhyolitic Volcanism ◽  
Archean Basement ◽  
Collisional Orogeny

New 40Ar/39Ar thermochronologic data from the internal zone of the Penokean orogen in east-central Minnesota indicate rapid cooling from mid-crustal temperatures. Early Proterozoic metamorphosed cover rocks yield concordant hornblende and biotite plateau ages of ~ 1755 Ma. Underlying Archean basement gneiss yields concordant muscovite and biotite plateau ages of ~ 1705 Ma. These are some of the oldest cooling ages recorded in rocks buried during the 1830–1860 Ma Penokean collisional orogeny. Cooling was coeval with regional rhyolitic volcanism and granite emplacement, suggesting a period of tectonic activity in this region during mid to late 1700 Ma. Based on similarities with Phanerozoic extensional regimes, we suggest, preliminarily, that these data might be explained by a previously unrecognized major extensional episode in the Lake Superior region.

Petrology and Chemistry of an Early Proterozoic Lherzolite-Gabbronorite-Anorthosite Pluton of the White Sea Complex, Northern Karelia, Russia

1995 ◽  
Vol 37 (6) ◽  
pp. 547-560 ◽  
Author(s):  
Gregory A. Snyder ◽  
Lawrence A. Taylor ◽  
Eric A. Jerde ◽  
E. V. Sharkov ◽  
V. V. Liachovitch ◽  
...  
Keyword(s):  
White Sea ◽  
The White Sea ◽  
Early Proterozoic

The first data on possible Mezozoic magmatism within the Western slope of the Southern Urals

2018 ◽  
pp. 24-34
Author(s):  
A. O. Khotylev ◽  
N. B. Devisheva ◽  
Al. V. Tevelev ◽  
V. M. Moseichuk
Keyword(s):  
Southern Urals ◽  
Western Slope ◽  
Isotopic Age ◽  
The Southern Urals ◽  
Early Proterozoic ◽  
Carbonate Formations ◽  
Two Bodies

Within the Western slope of the Southern Urals, there are plenty of basite dyke complexes of Riphean to Vendian among Precambrian terrigenous-carbonate formations. In metamorphic formations of the Taratash complex (Archean to Early Proterozoic, the northern closure of the Bashkirian meganticlinorium) there was observed the andesitic dyke with isotopic age of 71±1 Ma (U-Pb SHRIMP II on zircons) and near Bakal two bodies of gabbroids with zircons of similar ages were found. These are the first evidence of possible Mezozoic magmatism in this region.

The Community of the White Sea Microbenthos as an Indicator of the Sate of the Aquatic Environment

2001 ◽  
Vol 37 (3) ◽  
pp. 10
Author(s):  
V. L. Burkovskiy ◽  
A. K. Kashunin ◽  
A. I. Azovskiy
Keyword(s):  
Aquatic Environment ◽  
White Sea ◽  
The White Sea
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