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Year Published: 2014

MTpy: A Python toolbox for magnetotellurics

We present the software package MTpy that allows handling, processing, and imaging of magnetotelluric (MT) data sets. Written in Python, the code is open source, containing sub-packages and modules for various tasks within the standard MT data processing and handling scheme. Besides the independent definition of classes and functions,...

Krieger, Lars; Peacock, Jared R.

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Year Published: 2014

A geologic and mineral exploration spatial database for the Stillwater Complex, Montana

The Stillwater Complex is a Neoarchean, ultramafic to mafic layered intrusion exposed in the Beartooth Mountains in south-central Montana. This igneous intrusion contains magmatic mineralization that is variably enriched in strategic and critical commodities such as chromium, nickel, and the platinum-group elements. One deposit, the J-M Reef, is...

Zientek, Michael L.; Parks, Heather L.
Zientek, M.L., and Parks, H.L., 2014, A geologic and mineral exploration spatial database for the Stillwater Complex, Montana: U.S. Geological Survey Scientific Investigations Report 2014-5183, XX p., http://dx.doi.org/10.3133/sir20145183.

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Year Published: 2014

Evidence for large-magnitude, post-Eocene extension in the northern Shoshone Range, Nevada, and its implications for Carlin-type gold deposits in the lower plate of the Roberts Mountains allochthon

The northern Shoshone and Toiyabe Ranges in north-central Nevada expose numerous areas of mineralized Paleozoic rock, including major Carlin-type gold deposits at Pipeline and Cortez. Paleozoic rocks in these areas were previously interpreted to have undergone negligible postmineralization extension and tilting, but here we present new data that...

Colgan, Joseph P.; Henry, Christopher D.; John, David A.
Evidence for large-magnitude, post-Eocene extension in the northern Shoshone Range, Nevada, and its implications for Carlin-type gold deposits in the lower plate of the Roberts Mountains allochthon; 2014; Article; Journal; Economic Geology; Colgan, Joseph P.; Henry, Christopher D.; John, David A.

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Year Published: 2014

Evidence for a marine incursion along the lower Colorado River corridor

Foraminiferal assemblages in the stratigraphically lower part of the Bouse Formation in the Blythe Basin indicate marine conditions whereas assemblages in the upper part of the Bouse Formation indicate lacustrine conditions and suggest the presence of a saline lake. Benthic foraminiferal assemblages in the lower part of the Bouse Formation are...

McDougall, Kristin; Martínez, Adriana Yanet Miranda
Evidence for a marine incursion along the lower Colorado River corridor; 2014; Article; Journal; Geosphere; McDougall, Kristin; Martínez, Adriana Yanet Miranda

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Year Published: 2014

Detecting thermally driven cyclic deformation of an exfoliation sheet with lidar and radar

Rock falls from steep, exfoliating cliffs are common in many landscapes. Of the many mechanisms known to trigger rock falls, thermally driven deformation is among the least quantified, despite potentially being a prevalent trigger due to its occurrence at all times of year. Here we present the results of a field-based monitoring program using...

Collins, Brian D.; Stock, Greg M.

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Year Published: 2014

Sediment-hosted stratabound copper assessment of the Neoproterozoic Roan Group, central African copperbelt, Katanga Basin, Democratic Republic of the Congo and Zambia: Chapter T in Global mineral resource assessment

This study estimates the location, quality, and quantity of undiscovered copper in stratabound deposits within the Neoproterozoic Roan Group of the Katanga Basin in the Democratic Republic of the Congo and Zambia. The study area encompasses the Central African Copperbelt, the greatest sediment-hosted copper-cobalt province in the world, containing...

Zientek, Michael L.; Bliss, James D.; Broughton, David W.; Christie, Michael; Denning, Paul; Hayes, Timothy S.; Hitzman, Murray W.; Horton, John D.; Frost-Killian, Susan; Jack, Douglas J.; Master, Sharad; Parks, Heather L.; Taylor, Cliff D.; Wilson, Anna B.; Wintzer, Niki E.; Woodhead, Jon
Sediment-hosted stratabound copper assessment of the Neoproterozoic Roan Group, central African copperbelt, Katanga Basin, Democratic Republic of the Congo and Zambia: Chapter T in Global Mineral Resource Assessment; 2014; SIR; 2010-5090-T; Global Mineral Resource Assessment (Scientific Investigations Report 2010-5090); Zientek, Michael L.; Bliss, James D.; Broughton, David W.; Christie, Michael; Denning, Paul D.; Hayes, Timothy S.; Hitzman, Murray W.; Horton, John D.; Frost-Killian, Susan; Jack, Douglas J.; Master, Sharad; Parks, Heather L.; Taylor, Cliff D.; Wilson, Anna B.; Wintzer, Niki E.; Woodhead, Jon

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Year Published: 2014

Heuristic economic assessment of the Afghanistan construction materials sector: cement and dimension stone production

Over the past decade, the U.S. Government has invested more than $106 billion for physical, societal, and governmental reconstruction assistance to Afghanistan (Special Inspector General for Afghanistan Reconstruction, 2012a). This funding, along with private investment, has stimulated a growing demand for particular industrial minerals and...

Mossotti, Victor G.
Heuristic economic assessment of the Afghanistan construction materials sector: cement and dimension stone production; 2014; OFR; 2014-1208; Mossotti, Victor G.

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Year Published: 2014

A compilation of K-Ar-ages for southern California

The purpose of this report is to make available a large body of conventional K-Ar ages for granitic, volcanic, and metamorphic rocks collected in southern California. Although one interpretive map is included, the report consists primarily of a systematic listing, without discussion or interpretation, of published and unpublished ages that may be...

Miller, Fred K.; Morton, Douglas M.; Morton, Janet L.; Miller, David M.
A compilation of K-Ar-ages for southern California; 2014; OFR; 2014-1195; Miller, Fred K.; Morton, Douglas M.; Morton, Janet L.; Miller, David M.

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Year Published: 2014

Digital database of microfossil localities in Alameda and Contra Costa Counties, California

The eastern San Francisco Bay region (Contra Costa and Alameda Counties, California) is a geologically complex area divided by faults into a suite of tectonic blocks. Each block contains a unique stratigraphic sequence of Tertiary sediments that in most blocks unconformably overlie Mesozoic sediments. Age and environmental interpretations based on...

McDougall, Kristin; Block, Debra L.
Digital database of microfossil localities in Alameda and Contra Costa Counties, California; 2014; SIR; 2014-5120; McDougall, Kristin; Block, Debra

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Year Published: 2014

High-resolution topography and geomorphology of select archeological sites in Glen Canyon National Recreation Area, Arizona

Along the Colorado River corridor between Glen Canyon Dam and Lees Ferry, Arizona, located some 25 km downstream from the dam, archaeological sites dating from 8,000 years before present through the modern era are located within and on top of fluvial and alluvial terraces of the prehistorically undammed river. These terraces are known to have...

Collins, Brian D.; Corbett, Skye C.; Sankey, Joel B.; Fairley, Helen C.
High-resolution topography and geomorphology of select archeological sites in Glen Canyon National Recreation Area, Arizona; 2014; SIR; 2014-5126; Collins, Brian D.; Corbett, Skye C.; Sankey, Joel B.; Fairley, Helen C.

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Year Published: 2014

Correlated patterns in hydrothermal plume distribution and apparent magmatic budget along 2500 km of the Southeast Indian Ridge

Multiple geological processes affect the distribution of hydrothermal venting along a mid-ocean ridge. Deciphering the role of a specific process is often frustrated by simultaneous changes in other influences. Here we take advantage of the almost constant spreading rate (65–71 mm/yr) along 2500 km of the Southeast Indian Ridge (SEIR)...

Baker, Edward; Christophe Hémond; Anne Briais; Marcia Maia; Scheirer, Daniel S.; Sharon L. Walker; Tingting Wang; Yongshun John Chen
Baker, E. T., C. Hémond, A. Briais, M. Maia, D. S. Scheirer, S. L. Walker, T. Wang, and Y. J. Chen (2014), Correlated patterns in hydrothermal plume distribution and apparent magmatic budget along 2500 km of the Southeast Indian Ridge, Geochem. Geophys. Geosyst., 15, 3198–3211.

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Year Published: 2014

Geologic framework of thermal springs, Black Canyon, Nevada and Arizona

Thermal springs in Black Canyon of the Colorado River, downstream of Hoover Dam, are important recreational, ecological, and scenic features of the Lake Mead National Recreation Area. This report presents the results from a U.S. Geological Survey study of the geologic framework of the springs. The study was conducted in cooperation with the...

Beard, L. Sue; Anderson, Zachary W.; Felger, Tracey J.; Seixas, Gustav B.
Geologic framework of thermal springs, Black Canyon, Nevada and Arizona; 2014; OFR; 2013-1267-B; Beard, L. Sue; Anderson, Zachary W.; Felger, Tracey J.; Seixas, Gustav B.