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Year Published: 2014

Tectonic evolution of the Tualatin basin, northwest Oregon, as revealed by inversion of gravity data

The Tualatin basin, west of Portland (Oregon, USA), coincides with a 110 mGal gravity low along the Puget-Willamette lowland. New gravity measurements (n = 3000) reveal a three-dimensional (3-D) subsurface geometry suggesting early development as a fault-bounded pull-apart basin. A strong northwest-trending gravity gradient coincides with the...

McPhee, Darcy K.; Langenheim, Victoria E.; Wells, Ray; Blakely, Richard J.

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Year Published: 2014

Lateritic, supergene rare earth element (REE) deposits

Intensive lateritic weathering of bedrock under tropical or sub-tropical climatic conditions can form a variety of secondary, supergene-type deposits. These secondary deposits may range in composition from aluminous bauxites to iron and niobium, and include rare earth elements (REE). Over 250 lateritic deposits of REE are currently known and many...

Cocker, Mark D.

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Year Published: 2014

Magmatism, metasomatism, tectonism, and mineralization in the Humboldt Range, Pershing County, Nevada

Introduction The Humboldt Range, Pershing County, Nevada, predominantly consists of Mesozoic igneous and sedimentary rocks that were modified several times by magmatism, metasomatism, and tectonism, and contain a variety of metallic (Ag, Au, Pb, Zn, Sb, W, Hg) and non-metallic (dumortierite, pinite, fluorite) mineral deposits (Knopf, 1924; Kerr...

Vikre, Peter G.
in, Geological Society of Nevada Field Trip Guidebook, 2014, Special Publication 58

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Year Published: 2014

Potash: a global overview of evaporate-related potash resources, including spatial databases of deposits, occurrences, and permissive tracts: Chapter S in Global mineral resource assessment

Potash is mined worldwide to provide potassium, an essential nutrient for food crops. Evaporite-hosted potash deposits are the largest source of salts that contain potassium in water-soluble form, including potassium chloride, potassium-magnesium chloride, potassium sulfate, and potassium nitrate. Thick sections of evaporitic salt that form...

Orris, Greta J.; Cocker, Mark D.; Dunlap, Pamela; Wynn, Jeff C.; Spanski, Gregory T.; Briggs, Deborah A.; Gass, Leila; Bliss, James D.; Bolm, Karen S.; Yang, Chao; Lipin, Bruce R.; Ludington, Stephen; Miller, Robert J.; Słowakiewicz, Mirosław
Orris, G.J., Cocker, M.D., Dunlap, P., Wynn, J.C., Spanski, G.T., Briggs, D.G., and Gass, L., with contributions from Bliss, J.D., Bolm, K.S., Yang, C., Lipin, B.R., Ludington, S., Miller, R.J., and Slowakiewicz, M., 2014, Potash—A global overview of evaporite-related potash resources, including spatial databases of deposits, occurrences, and permissive tracts: U.S. Geological Survey Scientific Investigations Report 2010–5090–S, XX p., and spatial data, http://dx.doi.org/10.3133/sir20105090s.

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Year Published: 2014

Gravity survey and interpretation of Fort Irwin and vicinity, Mojave Desert, California

In support of a hydrogeologic study of the groundwater resources on Fort Irwin, we have combined new gravity data with preexisting measurements to produce an isostatic residual gravity map, which we then separated into two components reflecting (1) the density distribution in the pre-Cenozoic basement complex and (2) the distribution of low-...

Buesch, David C.; Jachens, Robert C.; Langenheim, V.E.
Jachens, R.C., and Langenheim, V.E., 2014, Gravity survey and interpretation of Fort Irwin and vicinity, Mojave Desert, California, chap. H of Buesch, D.C., ed., Geology and geophysics applied to groundwater hydrology at Fort Irwin, California: U.S. Geological Survey Open-File Report 2013–1024, 11 p., https://doi.org/10.3133/ofr20131024H.

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Year Published: 2014

Generalized surficial geologic map of the Fort Irwin Area, San Bernardino County, California

The geology and landscape of the Fort Irwin area, typical of many parts of the Mojave Desert, consist of rugged mountains separated by broad alluviated valleys that form the main coarse-resolution features of the geologic map. Crystalline and sedimentary rocks, Mesozoic and older in age, form most of the mountains with lesser accumulations of...

Buesch, David C.; Miller, David M.; Menges, Christopher M.; Lidke, David J.
Miller, D.M., Menges, C.M., and Lidke, D.J., 2014, Generalized surficial geologic map of the Fort Irwin area, San Bernardino County, California, chap. B of Buesch, D.C., ed., Geology and geophysics applied to groundwater hydrology at Fort Irwin, California: U.S. Geological Survey Open-File Report 2013–1024, 11 p., scale 1:100,000, https://doi.org/10.3133/ofr20131024B.

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Year Published: 2014

Introduction to the geologic and geophysical studies of Fort Irwin, California

Geologic and geophysical investigations in the vicinity of Fort Irwin National Training Center, California, have been completed in support of groundwater investigations, and are presented in eight chapters of this report. A generalized surficial geologic map along with field and borehole investigations conducted during 2010–11 provide a...

Buesch, David C.; Buesch, David C.
Buesch, D.C., 2014, Introduction to the geologic and geophysical studies of Fort Irwin, California, chap. A of Buesch, D.C., ed., Geology and geophysics applied to groundwater hydrology at Fort Irwin, California: U.S. Geological Survey Open-File Report 2013–1024, 8 p., https://doi.org/10.3133/ofr20131024A.

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Year Published: 2014

Aeromagnetic data, processing, and maps of Fort Irwin and vicinity, California

Aeromagnetic data help provide the underpinnings of a hydrogeologic framework for Fort Irwin by locating inferred structural features or grain that influence groundwater flow. Magnetization boundaries defined by horizontal-gradient analyses coincide locally with Cenozoic faults and can be used to extend these faults beneath cover. These boundaries...

Buesch, David C.; Langenheim, V.E.; Jachens, Robert C.
Langenheim, V.E., and Jachens, R.C., 2014, Aeromagnetic data, processing, and maps of Fort Irwin and vicinity, California, chap. I of Buesch, D.C., ed., Geology and geophysics applied to groundwater hydrology at Fort Irwin, California: U.S. Geological Survey Open-File Report 2013–1024, 18 p., https://doi.org/10.3133/ofr20131024I.

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Year Published: 2014

A reconnaissance for signs of a Mississippi Valley-type lead-zinc mineralizing system on the eastern flank of the Rutbah Uplift, Anbar Province, Iraq

Reconnaissance field visits and rock sampling were conducted at eight geologically selected locations within Mesozoic rocks on the eastern flank of the Rutbah Uplift, Anbar Province, western Iraq, in an attempt to determine if these rocks have been affected by a Mississippi Valley-Type (MVT) lead-zinc mineralizing system. Samples subsequently were...

Hayes, Timothy S.; Mustafa, Mazin; Bennet, Thair
Hayes, T.S., Mustafa, M., and Benni, T., 2014, A reconnaissance for signs of a Mississippi Valley-type lead-zinc mineralizing system on the eastern flank of the Rutbah Uplift, Anbar Province, Iraq: U.S. Geological Survey Open-File Report 2014-1240, 28 p., http://dx.doi.org/10.3133/ofr20141240.

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Year Published: 2014

Paleogeomorphology of the early Colorado River inferred from relationships in Mohave and Cottonwood Valleys, Arizona, California and Nevada

Geologic investigations of late Miocene–early Pliocene deposits in Mohave and Cottonwood valleys provide important insights into the early evolution of the lower Colorado River system. In the latest Miocene these valleys were separate depocenters; the floor of Cottonwood Valley was ∼200 m higher than the floor of Mohave Valley. When Colorado River...

Pearthree, Philip; House, P. Kyle

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Year Published: 2014

Lidar-revised geologic map of the Poverty Bay 7.5' quadrangle, King and Pierce Counties, Washington

For this map, we interpreted a 6-ft-resolution lidar digital elevation model combined with the geology depicted on the Geologic Map of the Poverty Bay 7.5' Quadrangle, King and Pierce Counties, Washington (Booth and others, 2004b). The authors of the 2004 map described, interpreted, and located the geology on the 1:24,000-scale topographic map of...

Tabor, Rowland W.; Booth, Derek B.; Troost, Kathy Goetz
Tabor, R.W., Booth, D.B., and Troost, K.G., 2014, Lidar-revised geologic map of the Poverty Bay 7.5' quadrangle, King and Pierce Counties, Washington: U.S. Geological Survey Scientific Investigations Map 3317, 22 p., scale 1:24,000, http://dx.doi.org/10.3133/sim3317.

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Year Published: 2014

U-Pb zircon age data for selected sedimentary, metasedimentary, and igneous rocks from northern and central Alaska

This publication contains the complete results of U-Pb zircon age dating studies of sedimentary and metasedimentary units from northern and central Alaska that are discussed and interpreted in other reports by the author. Most of the U-Pb ages are of detrital zircons from sandstones, although U-Pb ages from igneous and sedimentary clasts from...

Moore, Thomas E.
Moore, T.E., 2014, U-Pb Zircon Age Data For Selected Sedimentary, Metasedimentary, and Igneous Rocks From Northern and Central Alaska: U.S. Geological Survey Data Series 899, X p., http://dx.doi.org/10.3133/ds899.