scholarly journals Geologic logs and assays of cores from 1980, 1981, and 1982 drill holes of the Coal Creek tin property of the Talkeetna Mountains D-6 Quadrangle of the Alaska Range

2006 ◽  
Author(s):  
Keyword(s):  
Alaska Range ◽  
Talkeetna Mountains ◽  
Drill Holes

There's more Wrangellia - Magnetic characterization of southern Alaska crust

2021 ◽  
Author(s):  
Richard W. Saltus ◽  
Travis Hudson
Keyword(s):  
Lower Jurassic ◽  
Magnetic Potential ◽  
Magnetic Data ◽  
Magnetic Characterization ◽  
Alaska Range ◽  
Volcanic Arc ◽  
South Central ◽  
Fourier Filtering ◽  
Talkeetna Mountains ◽  
Bearing Part

In southern Alaska, Wrangellia-type magnetic crustal character extends from the Talkeetna Mountains southwest through the Alaska Range to the Bristol Bay region. Magnetic data analyses in the Talkeetna Mountains showed that there are mid-crustal differences in the magnetic properties of Wrangellia and the Peninsular terrane. After converting total field magnetic anomaly data to magnetic potential, we applied Fourier filtering techniques to remove magnetic responses from deep and shallow sources. The resulting mid-crustal magnetic characterization delineates the regional magnetic potential domains that correspond to the Wrangellia and Peninsular terranes throughout southern Alaska. These magnetic potential domains show that Wrangellia-type crust extends southwest to the Illiamna Lake region and that it overlaps the mapped Peninsular terrane. Upon reconsidering geologic ties between Wrangellia, Peninsular, and Alexander terranes we conclude that Peninsular terrane is part of what we here call Western Wrangellia. Western Wrangellia contains the Lower Jurassic Talkeetna volcanic arc and is similar to Wrangellia of the Vancouver Island area, Canada (Southern Wrangellia) which contains the Lower Jurassic Bonanza volcanic arc. Others have previously made this correlation and proposed that the Talkeetna arc-bearing part of southern Alaska was displaced from the Bonanza arc-bearing part of Canada. We generally agree and propose that about 1000 km of dextral displacement along ancestral Border Ranges fault segments and other faults of south-central Alaska separated Western Wrangellia from Southern Wrangellia. We think this displacement was mostly in the Late Jurassic and earliest Cretaceous, perhaps between about 160 and 130 Ma.

scholarly journals U-Pb geochronology of igneous and detrital zircon samples from the Tok River area, eastern Alaska Range, and Talkeetna Mountains, Alaska

2020 ◽  
Author(s):  
C.S. Holm-Denoma ◽  
K.R. Sicard ◽  
Evan Twelker
Keyword(s):  
Detrital Zircon ◽  
Alaska Range ◽  
Talkeetna Mountains

scholarly journals U-Pb and Lu-Hf isotope, age, and trace-element data from zircons at four sites in the western Alaska Range and Talkeetna Mountains, Alaska

2017 ◽  
Author(s):  
Erin Todd ◽  
Andrew Kylander-Clark ◽  
Alicja Wypych ◽  
Evan Twelker ◽  
K.R. Sicard
Keyword(s):  
Trace Element ◽  
Hf Isotope ◽  
Trace Element Data ◽  
Alaska Range ◽  
Element Data ◽  
Isotope Age ◽  
Talkeetna Mountains

Preparation of integrated circuits for TEM electromigration in situ studies

1986 ◽  
Vol 44 ◽  
pp. 882-883
Author(s):  
J. V. Maskowitz ◽  
W. E. Rhoden ◽  
D. R. Kitchen ◽  
R. E. Omlor ◽  
P. F. Lloyd
Keyword(s):  
Integrated Circuits ◽  
Crystallographic Orientation ◽  
Silicon Wafers ◽  
Minimum Size ◽  
Test Vehicle ◽  
In Situ Studies ◽  
Boron Doped ◽  
Doped Silicon ◽  
Drill Holes

The fabrication of the aluminum bridge test vehicle for use in the crystallographic studies of electromigration involves several photolithographic processes, some common, while others quite unique. It is most important to start with a clean wafer of known orientation. The wafers used are 7 mil thick boron doped silicon. The diameter of the wafer is 1.5 inches with a resistivity of 10-20 ohm-cm. The crystallographic orientation is (111).Initial attempts were made to both drill and laser holes in the silicon wafers then back fill with photoresist or mounting wax. A diamond tipped dentist burr was used to successfully drill holes in the wafer. This proved unacceptable in that the perimeter of the hole was cracked and chipped. Additionally, the minimum size hole realizable was > 300 μm. The drilled holes could not be arrayed on the wafer to any extent because the wafer would not stand up to the stress of multiple drilling.

Probabilistic evaluation of detection capability of eddy current testing to inspect pitting on a stainless steel clad using multiple signal features

2020 ◽  
Vol 64 (1-4) ◽  
pp. 47-55
Author(s):  
Takuma Tomizawa ◽  
Haicheng Song ◽  
Noritaka Yusa
Keyword(s):  
Stainless Steel ◽  
Eddy Current ◽  
Pressure Vessels ◽  
Eddy Current Testing ◽  
Probability Of Detection ◽  
Current Testing ◽  
Multiple Signal ◽  
Signal Features ◽  
Inner Surface ◽  
Drill Holes

This study proposes a probability of detection (POD) model to quantitatively evaluate the capability of eddy current testing to detect flaws on the inner surface of pressure vessels cladded by stainless steel and in the presence of high noise level. Welded plate samples with drill holes were prepared to simulate corrosion that typically appears on the inner surface of large-scale pressure vessels. The signals generated by the drill holes and the noise caused by the weld were examined using eddy current testing. A hit/miss-based POD model with multiple flaw parameters and multiple signal features was proposed to analyze the measured signals. It is shown that the proposed model is able to more reasonably characterize the detectability of eddy current signals compared to conventional models that consider a single signal feature.

Timing of ore-related magmatism in the western Alaska Range, southwestern Alaska

2014 ◽  
Author(s):  
Ryan D. Taylor ◽  
Garth E. Graham ◽  
Eric D. Anderson ◽  
David Selby
Keyword(s):  
Alaska Range ◽  
Southwestern Alaska

Spectrographic and chemical analyses of whole-rock and insoluble-residue samples, Rolla 1 degrees by 2 degrees quadrangle, Missouri; drill holes No. 39 and 40

1979 ◽  
Author(s):  
J.G. Viets ◽  
E.L. Mosier ◽  
J.M. Motooka ◽  
D.F. Siems ◽  
S.K. McDanal
Keyword(s):  
Insoluble Residue ◽  
Chemical Analyses ◽  
Drill Holes
Sign in / Sign up

Export Citation Format

Share Document