Vertical axis rotations in the Las Vegas Valley Shear Zone, southern Nevada: Paleomagnetic constraints on kinematics and dynamics of block rotations

Tectonics ◽  
1994 ◽  
Vol 13 (4) ◽  
pp. 769-788 ◽  
Author(s):  
Leslie J. Sonder ◽  
Craig H. Jones ◽  
Stephen L. Salyards ◽  
Kathleen M. Murphy
Keyword(s):  
Shear Zone ◽  
Las Vegas ◽  
Vertical Axis ◽  
Kinematics And Dynamics ◽  
Las Vegas Valley ◽  
Southern Nevada

New 40Ar/39Ar isotopic dates from Miocene volcanic rocks in the Lake Mead area and southern Las Vegas Range, Nevada

1998 ◽  
Vol 35 (5) ◽  
pp. 495-503 ◽  
Author(s):  
Stephen S Harlan ◽  
Ernest M Duebendorfer ◽  
Jack E Deibert
Keyword(s):  
Las Vegas ◽  
Volcanic Rocks ◽  
Normal Fault ◽  
Vertical Axis ◽  
Lake Mead ◽  
Basin And Range Province ◽  
Red Sandstone ◽  
Las Vegas Valley ◽  
Western Lake ◽  
Southern Nevada

New 40Ar/39Ar dates on volcanic rocks interlayered with synextensional Miocene sedimentary rocks in the western Lake Mead area and southern end of the Las Vegas Range provide tight constraints on magmatism, basin formation, and extensional deformation in the Basin and Range province of southern Nevada. Vertical axis rotations associated with movement along the Las Vegas Valley shear zone occurred after 15.67 ± 0.10 Ma (2 sigma ), based on a 40Ar/39Ar date from a tuff in the Gass Peak formation in the southern Las Vegas Range. Basaltic magmatism in the western Lake Mead area began as early as 13.28 ± 0.09 Ma, based on a date from a basalt flow in the Lovell Wash Member of the Horse Spring Formation. Isotopic dating of a basalt from the volcanic rocks of Callville Mesa indicates that these rocks are as old as 11.41 ± 0.14 Ma, suggesting that volcanic activity began shortly after formation of the Boulder basin, the extensional basin in which the informally named red sandstone unit was deposited. The red sandstone unit is at least as old as 11.70 ± 0.08 Ma and contains megabreccia deposits younger than 12.93 ± 0.10 Ma. This result shows that formation of the Boulder basin was associated with development of topographic relief that was probably generated by movement along the Saddle Island low-angle normal fault. Stratal tilting associated with extension occurred both prior to and after 11.5 Ma.

Ongoing restoration and management of Las Vegas Wash: an evaluation of success criteria

Water Policy ◽  
2014 ◽  
Vol 16 (4) ◽  
pp. 720-738 ◽  
Author(s):  
Mahesh Gautam ◽  
Kumud Acharya ◽  
Seth A. Shanahan
Keyword(s):  
Las Vegas ◽  
Management Strategies ◽  
Management Program ◽  
Lessons Learned ◽  
Lake Mead ◽  
Channel System ◽  
Las Vegas Valley ◽  
Success Criteria ◽  
Southern Nevada ◽  
Channel Degradation

The Las Vegas Wash is a dynamic channel system that drains the Las Vegas Valley (3,950 km2) into Lake Mead and the lower Colorado River, which provides drinking water to southern California, Arizona, and southern Nevada. In the last few decades the Las Vegas Wash has undergone massive changes in terms of channel degradation and bank erosion followed by recovery and restoration efforts. The evolution of the Las Vegas Wash is interlinked with urbanization, water use, and wastewater discharge. This article reviews the historical dynamics of the Las Vegas Wash in the context of restoration: evaluates the ongoing activities in the Las Vegas Wash against an established framework and success criteria; summarizes lessons learned; and discusses challenges. The ongoing activities in the Las Vegas Wash differ from other regional restoration projects in that there is a lack of an appropriate historical reference to which restoration goals should be targeted. Keys to the success of the Las Vegas Wash restoration and management program appear to be strong interagency collaboration, funding availability, effective outreach and monitoring efforts, and adaptive management strategies based on pragmatic urban values. There is a potential for realignment of existing resources for more practical ecological restoration goals.

Geophysical constraints on the location and geometry of the Las Vegas Valley Shear Zone, Nevada

Tectonics ◽  
2001 ◽  
Vol 20 (2) ◽  
pp. 189-209 ◽  
Author(s):  
V. E. Langenheim ◽  
J. A. Grow ◽  
R. C. Jachens ◽  
G. L. Dixon ◽  
J. J. Miller
Keyword(s):  
Shear Zone ◽  
Las Vegas ◽  
Las Vegas Valley

Late Wisconsin Groundwater Discharge Environments of the Southwestern Indian Springs Valley, Southern Nevada

1989 ◽  
Vol 31 (3) ◽  
pp. 351-370 ◽  
Author(s):  
Jay Quade ◽  
William L. Pratt
Keyword(s):  
Las Vegas ◽  
Groundwater Discharge ◽  
Wet Meadow ◽  
Fine Grained ◽  
Las Vegas Valley ◽  
Southern Nevada ◽  
Stratigraphic Position ◽  
Depositional Systems ◽  
Key Features ◽  
Marsh Sediments

AbstractBadland exposures in the Indian Springs Valley, southern Nevada, contain evidence of formerly widespread spring and seep discharge. The stratigraphic position and appearance of most of these deposits suggests correlation with late Wisconsin (30,000 to ca. 10,000 yr B.P.) marsh sediments in nearby Las Vegas Valley. Previously, all these deposits have been loosely described as lacustrine because of the presence of extensive green mudstones associated with aquatic mollusks. However, this association also typifies modern groundwater discharge environments in many basins of northeast Nevada such as the Steptoe Valley, basins often without hydrographic closure. Such analogs best explain the origin of late Wisconsin fine-grained deposits in the unclosed southwestern arm of the Indian Springs Valley. Key features of these depositional systems are the lack of shoreline deposits, the presence of a broad belt of subaerially deposited plae-brown silts surrounding spring, “wet meadow,” and marsh deposits, and the intermixture of terrestrial and aquatic mollusks in most horizons where mollusks occur.

scholarly journals Flood of July 8, 1999, in Las Vegas Valley, southern Nevada

Fact Sheet ◽  
2000 ◽  
Author(s):  
Daron J. Tanko ◽  
Richard L. Kane
Keyword(s):  
Las Vegas ◽  
Las Vegas Valley ◽  
Southern Nevada
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