Zobrazeno 1 - 10
of 42
pro vyhledávání: '"T. W. Stern"'
Publikováno v:
The Journal of Geology. 99:209-223
The Idono Complex of west-central Alaska is a fault-bounded, $$\sim300 km^{2}$$ fragment of Early Proterozoic continental crust surrounded by overlap assemblages and younger terranes accreted in Mesozoic time. It is composed of granitic to dioritic o
Publikováno v:
Professional Paper.
Publikováno v:
The Journal of Geology. 95:118-126
New U/Pb zircon ages from the Ray Mountains of central Alaska clarify the plutonic history of the Ruby geanticline and support earlier suggestions that the Ruby geanticline and southern Brooks Range were once parts of the same tectonostratigraphic te
Publikováno v:
Precambrian Research. 11:11-22
The RbSr and UPb methods were used to study gneisses in the 7 1 2 - minute Lake Helen quadrangle of the Big Horn Mountains, Wyoming. Two episodes of magmatism, deformation and metamorphism occurred during the Archean. Trondhjemitic to tonalitic
Publikováno v:
American Journal of Science. 287:635-660
Publikováno v:
Science. 166:741-744
Five Zirconi samples from Pennsylvania, Virginia, and North Carolina yield discordant uranium-lead ages which suggest an original age of 820 million years and an episodic lead loss at 240 million years. The indicated age of lead loss is interpreted a
Publikováno v:
Journal of Geophysical Research. 70:1503-1507
K-Ar ages of 23 and 26 m.y. for pyroxene and Pb206/U238 ages of 32 m.y. for zircon were determined for monzonite and soda syenite porphyries. A K-Ar age of 55 m.y. for hornblende and a Pb206/U238 age of 494 m.y. for zircon from diorite porphyry are i
Publikováno v:
American Journal of Science. 261:1-19
A series of K-Ar, Rb-Sr, and Pb/alpha age measurements in Maine, New Hampshire, and Vermont indicates a complex history of intrusion and metamorphism. Evidence of Grenville age (about 1000 million years ago) is preserved in southwestern Vermont, and
Autor:
L. R. Stieff, T. W. Stern
Publikováno v:
Science. 115:706-708