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Articles 1 - 13 of 13
Full-Text Articles in Physical Sciences and Mathematics
Plio-Quaternary Exhumation History Of The Central Nepalese Himalaya: 2. Thermo-Kinematic Model Of Thermochronometer Age Prediction Model, David Whipp Jr, Todd Ehlers, Ann Blythe, Katharine Huntington, Kip Hodges, Douglas Burbank
Plio-Quaternary Exhumation History Of The Central Nepalese Himalaya: 2. Thermo-Kinematic Model Of Thermochronometer Age Prediction Model, David Whipp Jr, Todd Ehlers, Ann Blythe, Katharine Huntington, Kip Hodges, Douglas Burbank
Ann Blythe
[1] In the Himalaya and other active convergent orogens, linear relationships between thermochronometer sample age and elevation are often used to estimate long-term exhumation rates. In these regions, high-relief topography and nonvertical exhumation pathways may invalidate such one-dimensional (1-D) interpretations and lead to significant errors. To quantify these errors, we integrate apatite fission track (AFT) ages from the central Himalaya with a 3-D coupled thermokinematic model, from which sample cooling ages are predicted using a cooling-rate-dependent algorithm. By changing the slip partitioning between faults near the Main Central thrust and the Main Frontal thrust system at the Himalayan range front, …
Plio-Quaternary Exhumation History Of The Central Nepalese Himalaya: 1. Apatite And Zircon Fission Track And Apatite [U-Th]/He Analyses, Ann Blythe, D Burbank, A Carter, K Schmidt, J Putkonen
Plio-Quaternary Exhumation History Of The Central Nepalese Himalaya: 1. Apatite And Zircon Fission Track And Apatite [U-Th]/He Analyses, Ann Blythe, D Burbank, A Carter, K Schmidt, J Putkonen
Ann Blythe
No abstract provided.
Guest Perspective: Energy Efficiency And Conservation: The Most Cost-Effective Approach To Climate Change, John Dernbach
Guest Perspective: Energy Efficiency And Conservation: The Most Cost-Effective Approach To Climate Change, John Dernbach
John C. Dernbach
No abstract provided.
Bonebeds: Genesis, Analysis, And Paleobiological Significance, Raymond Rogers, Daivd Eberth, Anthony Fiorillo
Bonebeds: Genesis, Analysis, And Paleobiological Significance, Raymond Rogers, Daivd Eberth, Anthony Fiorillo
Raymond Rogers
No abstract provided.
The Diachroneity Of Alluvial-Fan Lithostratigraphy?: A Test Case From Southeastern Ebro Basin Magnetostratigraphy, Nicholas Swanson-Hysell, David Barbeau
The Diachroneity Of Alluvial-Fan Lithostratigraphy?: A Test Case From Southeastern Ebro Basin Magnetostratigraphy, Nicholas Swanson-Hysell, David Barbeau
David L Barbeau Jr
Alluvial-fan strata contain valuable proxy data for kinematic, climatic and sediment-flux phenomena associated with high-relief source regions. Proper application of this data is dependent upon acquisition of accurate high-resolution chronostratigraphic data, best achieved through magnetostratigraphy. Collection of magnetostratigraphic and other proxy data from composite alluvial-fan sections assumes the chronostratigraphic significance of lithostratigraphy. We present the first test of this assumption with new magnetostratigraphy collected from Paleogene rocks of the southeastern Ebro basin. We report five new magnetostratigraphic sections that collectively sample 850 m of alluvial-fan and associated fluvial strata. One-hundred meters of lithostratigraphic overlap between these sections reveals equivalent magnetic …
Evidence Of Four Generations Of Monazite Growth In Proterozoic Migmatites Of The Santa Fe Range, North-Central New Mexico, Dan Heuer
Dan Heuer
No abstract provided.
U.S. Policy, John Dernbach
Stabilizing And Then Reducing U.S. Energy Consumption: Legal And Policy Tools For Efficiency And Conservation, John Dernbach
Stabilizing And Then Reducing U.S. Energy Consumption: Legal And Policy Tools For Efficiency And Conservation, John Dernbach
John C. Dernbach
Rising global demand for energy, high energy prices, climate change, and the threat of terrorism all point to the need for greater energy efficiency and conservation in the United States. While technological innovation is plainly needed, our laws and institutional arrangements must also play an important role. The United States has scores of legal and policy tools from which to choose to improve energy efficiency and curb energy consumption. This article evaluates a handful of these tools: transit-oriented development; fuel taxation; real-time pricing for electricity use; public benefit funds; improved efficiency in existing residential and commercial buildings; and expanded use …
Trace Element Chemistry Of Zircons From Oceanic Crust: A Method For Distinguishing Detrital Zircon Provenance, C B. Grimes, B E. John, P B. Kelemen, F K. Mazdab, J L. Wooden, M J. Cheadle, K Hanghoj, J J. Schwartz
Trace Element Chemistry Of Zircons From Oceanic Crust: A Method For Distinguishing Detrital Zircon Provenance, C B. Grimes, B E. John, P B. Kelemen, F K. Mazdab, J L. Wooden, M J. Cheadle, K Hanghoj, J J. Schwartz
Barbara John
We present newly acquired trace element compositions for more than 300 zircon grains in 36 gabbros formed at the slow-spreading Mid-Atlantic and Southwest Indian Ridges. Rare earth element patterns for zircon from modern oceanic crust completely overlap with those for zircon crystallized in continental granitoids. However, plots of U versus Yb and U/Yb versus Hf or Y discriminate zircons crystallized in oceanic crust from continental zircon, and provide a relatively robust method for distinguishing zircons from these environments. Approximately 80% of the modern ocean crust zircons are distinct from the fi eld defi ned by more than 1700 continental zircons …
Woodville Ice Cave (Hants County, Nova Scotia) And Notes On The “Ice Caves” Of The Canadian Maritimes, Max Moseley
Woodville Ice Cave (Hants County, Nova Scotia) And Notes On The “Ice Caves” Of The Canadian Maritimes, Max Moseley
Max Moseley
Several caves and sinkholes where snow and ice persist well into t he summer exist in Nova Scotia and New Brunswick. In the past they were sometimes used as a source of ice or for cold storage, and are known locally as 'ice caves' or 'ice holes'. Although they are not true ice caves i n the speleological sense o f the term because t hey do not contain p erenniailc e,t hey are very similar.W oodville l ce Cave in Hants County, Nova Scotia, described h ere,i s a particularly g ood e xample. Invertebrates and bats recorded from …
Overcoming The Behavioral Impetus For Greater U.S. Energy Consumption, John C. Dernbach
Overcoming The Behavioral Impetus For Greater U.S. Energy Consumption, John C. Dernbach
John C. Dernbach
No abstract provided.
In The Heat Of The Law, It's Not Just Steam: Geothermal Resources And The Impact On Thermophile Biodiversity, Donald J. Kochan, Tiffany Grant
In The Heat Of The Law, It's Not Just Steam: Geothermal Resources And The Impact On Thermophile Biodiversity, Donald J. Kochan, Tiffany Grant
Donald J. Kochan
Significant research has been conducted into the utilization of geothermal resources as a ‘green’ energy source. However, minimal research has been conducted into geothermal resource utilization and depletion impacts on thermophile biodiversity. Thermophiles are organisms which have adapted over millions of year to extreme temperature and chemical compositions and exist in hot springs and other geothermal resources. Their ability to withstand high temperatures makes them invaluable to scientific and medical research. Current federal and California case law classify geothermal resources as a mineral, not a water resource. Acquisition of rights to develop a geothermal resource owned or reserved by the …
Digital Elevation Accuracy And Grid Cell Size: Effects On Computed Topographic Attributes, Rob H. Erskine, Timothy R. Green
Digital Elevation Accuracy And Grid Cell Size: Effects On Computed Topographic Attributes, Rob H. Erskine, Timothy R. Green
Timothy R. Green
Terrain attributes are commonly used to explain the spatial variability of agronomic, pedologic, and hydrologic variables. The terrain attributes studied here (elevation, slope, aspect, and curvature) are estimated readily from digital elevation models (DEMs), but questions remain about how the accuracy and sample spacing of the elevation data affect the estimated attributes. The main objective of this study was to quantify differences in each terrain attribute due to factors affecting DEM accuracy and grid cell size. Three data sources were compared: (i) real-time kinematic global positioning system (RTKGPS); (ii) satellite-differentially corrected global positioning system (DGPS); and (iii) U.S. Geological Survey …