Archive | March 2015

USGS Nevada 3DEP Factsheet

This message was forwarded from Carol Ostergren:

From: Carol Ostergren
Sent: Thursday, March 26, 2015 10:12 AM
Subject: [SMAC] USGS Nevada 3DEP factsheet Online Publication Notice – Fact Sheet 2015-3028

Good morning,

I’m very pleased to release the 3DEP lidar factsheet for the great State of Nevada (attached). Thanks go to many individuals across the state who have led the charge for lidar knowledge and coordination. Special thanks to the Nevada State Geologists, Jon Price and Jim Faulds, for sponsoring lidar requirements gathering over the past 5 years, NBMG staff, in particular Seth Dee for his contributions, the NGIS board for lidar strategic planning efforts, and many others.

Also, on the lidar front, see the press release below for the summary of the first round BAA awards in 2015 http://www.usgs.gov/newsroom/article.asp?ID=4160#.VRLzs_nF98E

Next up—state meetings! We will be hosting 1 or 2 public meetings in Nevada to further information sharing about the 3DEP program and the next opportunity for proposals. Announcements for timing and places will be forthcoming.

More information about the 3DEP program can be found at http://nationalmap.gov/3dep/

The following USGS online publication was approved for release and has been made available to the public.

USGS Fact Sheet 2015-3028: The 3D Elevation Program—Summary for Nevada

Suggested citation:
Carswell, W.J., Jr., 2015, The 3D Elevation Program—Summary for Nevada: U.S. Geological Survey Fact Sheet 2015–3028, 2 p.

This publication is available at http://pubs.usgs.gov/fs/2015/3028/. After the Digital Object Identifier (DOI) and product metadata have been registered by CrossRef, the official URL will be http://dx.doi.org/10.3133/fs20153028 .

This publication is available online only.

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New State Managed Lands Interactive Web Map

This message was forwarded from Jennifer Vlcan:

From: Jennifer (Mauldin) Vlcan
Sent: Friday, March 27, 2015 3:16 PM
Subject: New State Managed Lands Interactive Web Map

An announcement from Stephanie Snider with NV Division of State Lands:
The Nevada Division of State Lands (NDSL) uses spatial data for land use planning, resource protection and responsible stewardship of the lands entrusted to our agency. The State Managed Lands Interactive Web Map makes it easy to view NDSL managed properties to determine land ownership, using agency, performing assets, acreage and much more. To review the web map, download GIS data and connect to the NDSL map service, please check out our Maps and GIS Resources webpage at: http://lands.nv.gov/maps/index.htm

Stephanie Snider
IT/GIS Manager; Business Process Analyst III
NV Division of State Lands
901 S. Stewart Street, Suite #5003
Carson City, NV 89701
775-684-2727
ssnider@lands.nv.gov

New Topographic Map Web Index from NBMG

A huge thank you goes to Rachel Micander (NBMG Cart/GIS group) for creating this new topographic map web app.

NBMG Topographic Map Index:
Instructions for use are included on this web page:
http://nbmg.maps.arcgis.com/apps/Viewer/index.html?appid=705176c4c3444f2e96ca7d5295319c6b
http://pubs.nbmg.unr.edu/category-s/1845.htm
http://pubs.nbmg.unr.edu/category-s/1940.htm

Stay tuned for the interactive index for geologic maps that the Cart/GIS group at NBMG is working on right now.

NPGS Dinner Meeting—Sean Long—April 2 (RSVP by March 31) A newly defined fold province in eastern Nevada:  a Valley and Ridge in the Basin and Range

NPGS logo
What:
Nevada Petroleum and Geothermal Society Monthly Dinner Meeting
When: Thursday April 2, 2015 at 6:30 PM
Speaker: Sean Long
Topic: A newly defined fold province in eastern Nevada: a Valley and Ridge in the Basin and Range

Abstract: In Nevada, Tertiary extension has obscured the geological record of Mesozoic deformation that construction the Cordilleran mountain belt. In this study, a new paleo-geologic map of eastern Nevada, showing the ages and distributions of rocks that were at the surface at about 30 million years ago, illustrates the style and geometry of deformation associated with Cordilleran mountain building. The map reveals a region of folds in eastern Nevada that are similar in scale to those in the Appalachian Valley and Ridge province. The folds are interpreted to have formed during the Cretaceous period, as a result of eastward translation above a deep detachment surface that projects westward from the Sevier fold-and-thrust belt in Utah. These observations are synthesized with studies of other structural provinces of Nevada and western Utah, to propose a model for deformation during Cordilleran mountain building.

Sean Long has been a research geologist at the Nevada Bureau of Mines and Geology since 2010. He is a structural geologist, primarily interested in contractional orogenic belts. http://www.nbmg.unr.edu/staff/Long.html

Details: Ramada Reno Hotel; 6:30 PM
1000 East 6th Street, Reno, NV 89512
Open Bar 6:30 pm, Skyline Room 14th Floor
Dinner Served at 7:00 PM
NPGS Members $20, Non-Members $23, Students $10

Please RSVP by Tuesday, March 31, with the following link:
https://docs.google.com/forms/d/1Civ9seJbmOefNJuASed5TZNPao609UuwPLloAHkCcRc/viewform

If you have RSVP’d, and find that you cannot attend, please notify NPGS as soon as you are able as NPGS will be charged for all no-shows. Thank you for your consideration.

Vicki D. Ehni
Ehni Enterprises, Inc.
P.O. Box 4228
Carson City, NV 89702-4228
(775) 883-1107, FAX (775) 883-7279
CELL (775) 720-6387, vehni@aol.com

DGSE colloquium—TODAY Monday March 30

The Department of Geological Sciences and Engineering colloquim will be TODAY March 30 at 4:00 in DMS 105.

Speaker: Wanda Taylor, UNLV Department of Geoscience
Title: Cenozoic structure and tectonics in southern Nevada
When: Monday March 30, 2015
Where: 4:00 p.m. in DMS 105 (The Davidson Mathematics and Science Center at the University of Nevada, Reno): http://www.unr.edu/around-campus/facilities/davidson

Upcoming Talk at NPGS—Sean Long—April 2

NPGS logo

What: NPGS Monthly Dinner Meeting in Reno, NV
When: Thursday April 2, 2015 at 6:30 PM
Speaker: Sean Long
Topic:
A newly-defined fold province in eastern Nevada: a Valley and Ridge in the Basin and Range

Abstract: In Nevada, Tertiary extension has obscured the geological record of Mesozoic deformation that construction the Cordilleran mountain belt. In this study, a new paleo-geologic map of eastern Nevada, showing the ages and distributions of rocks that were at the surface at about 30 million years ago, illustrates the style and geometry of deformation associated with Cordilleran mountain building. The map reveals a region of folds in eastern Nevada that are similar in scale to those in the Appalachian Valley and Ridge province. The folds are interpreted to have formed during the Cretaceous period, as a result of eastward translation above a deep detachment surface that projects westward from the Sevier fold-and-thrust belt in Utah. These observations are synthesized with studies of other structural provinces of Nevada and western Utah, to propose a model for deformation during Cordilleran mountain building.

More information coming soon!

New Articles by Sean Long

Three new articles by NBMG research geologist Sean Long and co-authors (including NBMG’s Chris Henry and John Muntean), two focusing on the Eureka area, and one regional study across eastern Nevada, have recently been published in the journals Geosphere and Geology.  PDFs of these papers, and accompanying maps and plates, are available for download at www.seanpatricklong.com/publications.html

Long, S.P., Henry, C.D., Muntean, J.L., Edmondo, G.P., and Cassel, E.J., 2014, Early Cretaceous construction of a structural culmination, Eureka, Nevada, U.S.A.: implications for out-of-sequence deformation in the Sevier hinterland: Geosphere, v. 10, p. 564-584, doi:10.1130/GES00997.1.

Abstract: Documenting the timing relationships between deformation in the frontal and distal parts of mountain belts is fundamental for understanding the dynamics of how they are constructed.  In this study, we present a new geometric and timing model for deformation in the distal part of the Mesozoic Cordilleran mountain belt in central Nevada.  The model is based on new geologic mapping, cross-sections that illustrate the modern and pre-deformed geometry, new age dates from volcanic and sedimentary rocks, and assessment of regional field relationships.  Our results reveal that Cretaceous deformation was taking place in the distal part of the mountain belt in Nevada at the same time as deformation in the frontal part in Utah.  We use this new timing relationship, along with the predictions of models for the dynamic behavior of the construction of mountain belts, to propose that this deformation in Nevada and Utah was genetically-linked.

Long, S.P., 2015, An upper-crustal fold province in the hinterland of the Sevier orogenic belt, eastern Nevada, U.S.A.: a Cordilleran Valley and Ridge in the Basin and Range: Geosphere (published online 2-17-15), v. 11, doi:10.1130/GES01102.1.

Abstract: In Nevada, Tertiary extension of the crust has obscured the geological records of older deformation events, including the Mesozoic construction of the Cordilleran mountain belt. In this study, a paleo-geologic map of eastern Nevada, showing the ages and distributions of rocks that were at the surface at about 30 million years ago, illustrates the style and geometry of deformation associated with Cordilleran mountain building. The map reveals a region of folds in eastern Nevada that are similar in scale to those in the Valley and Ridge province of the Appalachian mountains. The folds are interpreted to have formed during the Cretaceous period, as a result of eastward translation above a deep detachment surface that projects westward from the Sevier fold-and-thrust belt in Utah. These observations are synthesized with studies of other structural provinces of Nevada and western Utah, to propose a model for deformation during Cordilleran mountain building.

Long, S.P., Thomson, S.N., Reiners, P.W., and Di Fiori, R.V., 2015, Synorogenic extension localized by upper-crustal thickening: an example from the Late Cretaceous Nevadaplano: Geology (published online 2-27-15), v. 43, doi:10.1130/G36431.1.

Abstract: Mountain belts such as the Himalayas, Andes, and North American Cordillera are formed from contractional deformation that shortens and thickens continental crust. However, in several mountain belts, extensional deformation that thins and stretches the crust has been documented to occur simultaneously with contractional deformation. At present, we do not fully understand the factors that control the location of extension during mountain building. In this paper, an example of extension during mountain building is documented in the North American Cordilleran mountain belt in Nevada, where an arch-shaped fold that developed from contractional deformation was later extended by faults. Motion on these faults brought rocks that were buried to 6-8 km depths to near the surface, resulting in significant cooling. The timing and rates of this cooling are calculated, using four different techniques that give ages for cooling through a total temperature range of 220˚C to 60˚C. The timing of cooling, and therefore the timing of extensional faulting, was between 75 and 60 million years ago, which is synchronous with contractional mountain building in this region of Nevada. This study demonstrates that sites of local crustal thickening can focus the location of extension during mountain building.