Publications
Products (journal articles, reports, fact sheets) authored by current and past scientists are listed below. Please check the USGS Pubs Warehouse for other USGS publications.
Filter Total Items: 2018
Saturn's Titan: Surface change, ammonia, and implications for atmospheric and tectonic activity Saturn's Titan: Surface change, ammonia, and implications for atmospheric and tectonic activity
Titan is known to have a young surface. Here we present evidence from the Cassini Visual and Infrared Mapping Spectrometer that it is currently geologically active. We report that changes in the near-infrared reflectance of a 73,000 km2 area on Titan (latitude 26° S, longitude 78° W) occurred between July 2004 and March of 2006. The reflectance of the area increased by a factor of two...
Authors
R.M. Nelson, L.W. Kamp, D. L. Matson, P.G.J. Irwin, K. H. Baines, M.D. Boryta, F.E. Leader, R. Jaumann, W. D. Smythe, Christophe Sotin, R. N. Clark, D. P. Cruikshank, P. Drossart, J.C. Pearl, B.W. Hapke, J. Lunine, M. Combes, G. Bellucci, J.-P. Bibring, F. Capaccioni, P. Cerroni, A. Coradini, V. Formisano, G. Filacchione, R.Y. Langevin, T. B. McCord, V. Mennella, P. Nicholson, B. Sicardy
Carlin-type gold deposits: By daylight, by caplight, and by the Caetano Caldera - Leeville Gold Mine, Carlin Trend, Pipeline-Cortez Hills Gold Mines, Caetano Caldera Carlin-type gold deposits: By daylight, by caplight, and by the Caetano Caldera - Leeville Gold Mine, Carlin Trend, Pipeline-Cortez Hills Gold Mines, Caetano Caldera
No abstract available.
Authors
Peter G. Vikre
U.S. Geological Survey research in Handcart Gulch, Colorado—An alpine watershed with natural acid-rock drainage U.S. Geological Survey research in Handcart Gulch, Colorado—An alpine watershed with natural acid-rock drainage
Handcart Gulch is an alpine watershed along the Continental Divide in the Colorado Rocky Mountain Front Range. It contains an unmined mineral deposit typical of many hydrothermal mineral deposits in the intermountain west, composed primarily of pyrite with trace metals including copper and molybdenum. Springs and the trunk stream have a natural pH value of 3 to 4. The U.S. Geological...
Authors
Andrew H. Manning, Jonathan S. Caine, Philip L. Verplanck, Dana J. Bove, Katherine G. Kahn
Embodied energy in the stone quarry Embodied energy in the stone quarry
No abstract available.
Authors
William H. Langer
The trials of sustainability The trials of sustainability
No abstract available.
Authors
W. H. Langer
Identification of hydrated silicate minerals on Mars using MRO-CRISM: Geologic context near Nili Fossae and implications for aqueous alteration Identification of hydrated silicate minerals on Mars using MRO-CRISM: Geologic context near Nili Fossae and implications for aqueous alteration
[1] The Noachian terrain west of the Isidis basin hosts a diverse collection of alteration minerals in rocks comprising varied geomorphic units within a 100,000 km2 region in and near the Nili Fossae. Prior investigations in this region by the Observatoire pour l'Minéralogie, l'Eau, les Glaces, et l'Activité (OMEGA) instrument on Mars Express revealed large exposures of both mafic...
Authors
B.L. Ehlmann, J.F. Mustard, G.A. Swayze, R. N. Clark, J.L. Bishop, F. Poulet, D.J. Des Marais, L.H. Roach, R.E. Milliken, J.J. Wray, O. Barnouin-Jha, S.L. Murchie
Carbon isotope chemostratigraphy and precise dating of middle Frasnian (lower Upper Devonian) Alamo Breccia, Nevada, USA Carbon isotope chemostratigraphy and precise dating of middle Frasnian (lower Upper Devonian) Alamo Breccia, Nevada, USA
At Hancock Summit West, Nevada, western USA, uppermost Givetian (upper Middle Devonian) and lower and middle Frasnian (lower Upper Devonian) rocks of the lower Guilmette Formation include, in stratigraphic sequence, carbonate-platform facies of the conodont falsiovalis, transitans, and punctata Zones; the type Alamo Breccia Member of the middle punctata Zone; and slope facies of the...
Authors
J. R. Morrow, Charles Sandberg, K. Malkowski, M.M. Joachimski
A synthesis of Martian aqueous mineralogy after 1 Mars year of observations from the Mars Reconnaissance Orbiter A synthesis of Martian aqueous mineralogy after 1 Mars year of observations from the Mars Reconnaissance Orbiter
Martian aqueous mineral deposits have been examined and characterized using data acquired during Mars Reconnaissance Orbiter's (MRO) primary science phase, including Compact Reconnaissance Imaging Spectrometer for Mars hyperspectral images covering the 0.4-3.9 ??m wavelength range, coordinated with higher-spatial resolution HiRISE and Context Imager images. MRO's new high-resolution...
Authors
S.L. Murchie, J.F. Mustard, B.L. Ehlmann, R.E. Milliken, J.L. Bishop, N.K. McKeown, E.Z. Noe Dobrea, F.P. Seelos, D.L. Buczkowski, S.M. Wiseman, R. E. Arvidson, J.J. Wray, G. Swayze, R. N. Clark, D.J. Des Marais, A. S. McEwen, J.-P. Bibring
Processes affecting δ34S and δ18O values of dissolved sulfate in alluvium along the Canadian River, central Oklahoma, USA Processes affecting δ34S and δ18O values of dissolved sulfate in alluvium along the Canadian River, central Oklahoma, USA
The δ34S and δ18O values for dissolved sulfate in groundwater are commonly used in aquifer studies to identify sulfate reservoirs and describe biogeochemical processes. The utility of these data, however, often is compromised by mixing of sulfate sources within reservoirs and isotope fractionation during sulfur redox cycling. Our study shows that, after all potential sulfate sources are...
Authors
Michele L. Tuttle, George N. Breit, Isabelle M. Cozzarelli