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: 1913
Photometric changes on Saturn's Titan: Evidence for active cryovolcanism Photometric changes on Saturn's Titan: Evidence for active cryovolcanism
We report infrared spectrophotometric variability on the surface of Saturn's moon Titan detected in images returned by the Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini Saturn Orbiter. The changes were observed at 7°S, 138°W and occurred between October 27, 2005 and January 15, 2006. After that date the surface was unchanged until the most recent observation, March...
Authors
Robert M. Nelson, Lucas W. Kamp, Rosaly Lopes, Dennis L. Matson, Randolph L. Kirk, Bruce W. Hapke, Stephen D. Wall, Mark D. Boryta, Frank E. Leader, William D. Smythe, Karl L. Mitchell, Kevin H. Baines, Ralf Jaumann, Christophe Sotin, Roger N. Clark, Dale P. Cruikshank, Pierre Drossart, Jonathan I. Lunine, Michel Combes, Giancarlo Bellucci, Jean-Pierre Bibring, Fabrizio Capaccioni, Pricilla Cerroni, Angioletta Coradini, Vittorio Formisano, Gianrico Filacchione, Yves Langevin, Thomas B. McCord, Vito Mennella, Philip D. Nicholson, Bruno Sicardy, Patrick G.J. Irwin, John C. Pearl
A preliminary study of older hot spring alteration in Sevenmile Hole, Grand Canyon of the Yellowstone River, Yellowstone Caldera, Wyoming A preliminary study of older hot spring alteration in Sevenmile Hole, Grand Canyon of the Yellowstone River, Yellowstone Caldera, Wyoming
Erosion in the Grand Canyon of the Yellowstone River, Yellowstone Caldera (640 ka), Wyoming, has exposed a cross section of older hydrothermal alteration in the canyon walls. The altered outcrops of the post-collapse tuff of Sulphur Creek (480 ka) extend from the canyon rim to more than 300 m beneath it. The hydrothermal minerals are zoned, with an advanced argillic alteration consisting...
Authors
Peter B. Larson, Allison Phillips, David A. John, Michael A. Cosca, Chad Pritchard, Allen K. Andersen, Jennifer Manion
Geomorphic controls on mercury accumulation in soils from a historically mined watershed, Central California Coast Range, USA Geomorphic controls on mercury accumulation in soils from a historically mined watershed, Central California Coast Range, USA
Historic Hg mining in the Cache Creek watershed in the Central California Coast Range has contributed to the downstream transport of Hg to the San Francisco Bay-Delta. Different aspects of Hg mobilization in soils, including pedogenesis, fluvial redistribution of sediment, volatilization and eolian transport were considered. The greatest soil concentrations (>30 mg Hg kg-1) in Cache...
Authors
J.M. Holloway, M. B. Goldhaber, J.M. Morrison
Saturn's north polar cyclone and hexagon at depth revealed by Cassini/VIMS Saturn's north polar cyclone and hexagon at depth revealed by Cassini/VIMS
A high-speed cyclonic vortex centered on the north pole of Saturn has been revealed by the visual-infrared mapping spectrometer (VIMS) onboard the Cassini-Huygens Orbiter, thus showing that the tropospheres of both poles of Saturn are occupied by cyclonic vortices with winds exceeding 135 m/s. High-spatial-resolution (~200 km per pixel) images acquired predominantly under night-time...
Authors
K. H. Baines, T.W. Momary, L.N. Fletcher, A.P. Showman, M. Roos-Serote, R. H. Brown, B. J. Buratti, R. N. Clark, P. D. Nicholson
Geochemical evolution of a high arsenic, alkaline pit-lake in the Mother Lode Gold District, California Geochemical evolution of a high arsenic, alkaline pit-lake in the Mother Lode Gold District, California
The Harvard orebody at the Jamestown gold mine, located along the Melones fault zone in the southern Mother Lode gold district, California, was mined in an open-pit operation from 1987 to 1994. Dewatering during mining produced a hydrologic cone of depression; recovery toward the premining ground-water configuration produced a monomictic pit lake with alkaline Ca-Mg-HCO3-SO4–type pit...
Authors
Kaye S. Savage, Roger P. Ashley, Dennis K. Bird
Discovery of lake-effect clouds on Titan Discovery of lake-effect clouds on Titan
Images from instruments on Cassini as well as from telescopes on the ground reveal the presence of sporadic small-scale cloud activity in the cold late-winter north polar region of Saturn's large moon Titan. These clouds lie underneath the previously discovered uniform polar cloud attributed to a quiescent ethane cloud at ???40 km and appear confined to the same latitudes as those of the...
Authors
M.E. Brown, E.L. Schaller, H.G. Roe, C. Chen, J. Roberts, R. H. Brown, K. H. Baines, R. N. Clark
Natural low-pH environments unaffected by human activity Natural low-pH environments unaffected by human activity
No abstract available.
Authors
Robert G. Eppinger, Ron Fuge
Character and spatial distribution of OH/H2O on the surface of the moon seen by M3 on chandrayaan-1 Character and spatial distribution of OH/H2O on the surface of the moon seen by M3 on chandrayaan-1
The search for water on the surface of the anhydrous Moon had remained an unfulfilled quest for 40 years. However, the Moon Mineralogy Mapper (M 3) on Chandrayaan-1 has recently detected absorption features near 2.8 to 3.0 micrometers on the surface of the Moon. For silicate bodies, such features are typically attributed to hydroxyl- and/or water-bearing materials. On the Moon, the...
Authors
C.M. Pieters, J.N. Goswami, R. N. Clark, M. Annadurai, J. Boardman, B. Buratti, J. #NAME? Combe, M.D. Dyar, R. Green, J.W. Head, C. Hibbitts, M. Hicks, P. Isaacson, R. Klima, G. Kramer, S. Kumar, E. Livo, S. Lundeen, E. Malaret, T. McCord, J. Mustard, J. Nettles, N. Petro, C. Runyon, M. Staid, J. Sunshine, L.A. Taylor, S. Tompkins, P. Varanasi
Mapping potentialy asbestos-bearing rocks using imaging spectroscopy Mapping potentialy asbestos-bearing rocks using imaging spectroscopy
Rock and soil that may contain naturally occurring asbestos (NOA), a known human carcinogen, were mapped in the Sierra Nevada, California, using the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) to determine if these materials could be uniquely identified with spectroscopy. Such information can be used to prepare or refine maps of areas that may contain minerals that can be...
Authors
G.A. Swayze, R.F. Kokaly, C.T. Higgins, J.P. Clinkenbeard, R. N. Clark, H.A. Lowers, S. J. Sutley
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