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Title: Tact refraction/wide-angle reflection profiling of the Yukon-Tanana uplands, east-central, Alaska

Abstract

Two Trans-Alaska Crustal Transect (TACT) seismic refraction studies, sampling the crust beneath the Yukon-Tanana terrane (YTT) and the terranes along its northwestern boundary in east-central Alaska, are interpreted using both forward and inverse modeling techniques. These studies reveal a thin (c. 30 km), reflective middle to lower crust beneath the southern YTT and the terranes to its northwest. Beneath the southern profile, the Fairbanks South profile, the YTT is interpreted to be quartz-rich and to result from tectonic underplating. Beneath the northern profile, the Fairbanks North profile, the refraction data reveal a crustal velocity structure that is divided into three upper crustal, and two or three middle to lower crustal domains. The upper crustal domains are delineated by two vertical, low-velocity zones that contain or are bounded by interpreted strands of the Tintina fault system. This interpretation suggests that after initial thin-skinned amalgamation of the various terranes caught between the Yukon-Tanana and Ruby terranes, this region experienced thick-skinned tectonic reorganization. These two studies indicate that both thin-skinned amalgamation and thick-skinned tectonic reorganization played important roles in the development of the Alaskan lithosphere.

Authors:
 [1];  [2]; ; ; ; ;  [3]
  1. Stanford Univ., CA (United States). Geophysics Dept.
  2. Purdue Univ., Lafayette, IN (United States). Dept. of Earth and Atmospheric Sciences
  3. Geological Survey, Menlo Park, CA (United States)
Publication Date:
OSTI Identifier:
5343184
Report Number(s):
CONF-9305259-
Journal ID: ISSN 0016-7592; CODEN: GAAPBC
Resource Type:
Conference
Journal Name:
Geological Society of America, Abstracts with Programs; (United States)
Additional Journal Information:
Journal Volume: 25:5; Conference: 89. annual meeting of the Cordilleran Section and the 46th annual meeting of the Rocky Mountain Section of the Geological Society of America (GSA), Reno, NV (United States), 19-21 May 1993; Journal ID: ISSN 0016-7592
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ALASKA; EARTH CRUST; SEISMIC SURVEYS; DATA ANALYSIS; GEOLOGIC DEPOSITS; GEOLOGIC MODELS; REFLECTION; SEISMIC WAVES; DEVELOPED COUNTRIES; GEOPHYSICAL SURVEYS; NORTH AMERICA; SURVEYS; USA; 580000* - Geosciences

Citation Formats

Beaudoin, B C, Christensen, N I, Fuis, G S, Lutter, W J, Mooney, W D, Moore, T E, and Nokleberg, W J. Tact refraction/wide-angle reflection profiling of the Yukon-Tanana uplands, east-central, Alaska. United States: N. p., 1993. Web.
Beaudoin, B C, Christensen, N I, Fuis, G S, Lutter, W J, Mooney, W D, Moore, T E, & Nokleberg, W J. Tact refraction/wide-angle reflection profiling of the Yukon-Tanana uplands, east-central, Alaska. United States.
Beaudoin, B C, Christensen, N I, Fuis, G S, Lutter, W J, Mooney, W D, Moore, T E, and Nokleberg, W J. Thu . "Tact refraction/wide-angle reflection profiling of the Yukon-Tanana uplands, east-central, Alaska". United States.
@article{osti_5343184,
title = {Tact refraction/wide-angle reflection profiling of the Yukon-Tanana uplands, east-central, Alaska},
author = {Beaudoin, B C and Christensen, N I and Fuis, G S and Lutter, W J and Mooney, W D and Moore, T E and Nokleberg, W J},
abstractNote = {Two Trans-Alaska Crustal Transect (TACT) seismic refraction studies, sampling the crust beneath the Yukon-Tanana terrane (YTT) and the terranes along its northwestern boundary in east-central Alaska, are interpreted using both forward and inverse modeling techniques. These studies reveal a thin (c. 30 km), reflective middle to lower crust beneath the southern YTT and the terranes to its northwest. Beneath the southern profile, the Fairbanks South profile, the YTT is interpreted to be quartz-rich and to result from tectonic underplating. Beneath the northern profile, the Fairbanks North profile, the refraction data reveal a crustal velocity structure that is divided into three upper crustal, and two or three middle to lower crustal domains. The upper crustal domains are delineated by two vertical, low-velocity zones that contain or are bounded by interpreted strands of the Tintina fault system. This interpretation suggests that after initial thin-skinned amalgamation of the various terranes caught between the Yukon-Tanana and Ruby terranes, this region experienced thick-skinned tectonic reorganization. These two studies indicate that both thin-skinned amalgamation and thick-skinned tectonic reorganization played important roles in the development of the Alaskan lithosphere.},
doi = {},
journal = {Geological Society of America, Abstracts with Programs; (United States)},
issn = {0016-7592},
number = ,
volume = 25:5,
place = {United States},
year = {1993},
month = {4}
}

Conference:
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