Preliminary analysis of gravity and aeromagnetic surveys of the Timber Mountain Area, southern Nevada

Technical Report · Thu Dec 31 04:00:00 EST 1981

DOI:https://doi.org/10.2172/59628· OSTI ID:59628

Kane, M. F.; Webring, M. W.; Bhattacharyya, B. K.

Recent (1977 to 1978) gravity and aeromagnetic surveys of the Timber Mountain region, southern Nevada, have revealed new details of subsurface structure and lithology. The data strongly suggest that deformation caused by volcanic events has been accommodated along straight-line faults combining in such a fashion as to given a curvilinear appearance to regional structure. The magnetic data suggest that rock units in the central graben and along the southeast margin of Timber Mountain may have been altered, perhaps thermally, from their original state. The gravity data indicate that the south part of the Timber Mountain is underlain by relatively dense rock possibly intrusive rock, like that which crops out along its southeast side. The gravity data also suggest that the Silent Canyon caldera may extend considerably south of its presently indicated southern limit and may underlie much of the area of Timber Mountain. The moat areas appear to be more rectangular or triangular than annular in shape. The southern part of Timber Mountain caldera is separated from the Yucca Mountain area to the south by a triangular horst. The structural relations of the rock units making up the horst are complex. Several linear terrain features in the southern part of the caldera area are closely aligned with geophysical features, implying that the terrain features are fault-controlled.

• Research Organization: Geological Survey, Denver, CO (United States)
• DOE Contract Number: AI08-78ET44802
• OSTI ID: 59628
• Report Number(s): DOE/ET/44802--T2; ON: DE81029462
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GRAVITY SURVEYS
MAGNETIC SURVEYS
NEVADA
VOLCANOES
Yucca Mountain Project