搜索结果: 1-12 共查到“地球科学总论 USA”相关记录12条 . 查询时间(0.035 秒)
Characterization of magmatic and diffusional processes in fractionally differentiated ultramafic systems: Examples from the Grand Canyon, USA
Earth sciences Grand Canyon Magma chamber Olivine coronas Proterozoic Spinel Ultramafic
2014/10/22
A 50 meter thick unit of Proterozoic cumulate layered wehrlite, lherzolite, and olivine websterite exposed at river mile 91 in the Ninetyone Mile Creek Canyon, a side canyon to the Grand Canyon, Arizo...
Th Effcts of Sea Level Change on the Molecular and Isotopic Composition of Sediments in the Cretaceous Western Interior Seaway: Oceanic Anoxic Event 3, Mesa Verde, CO, USA
Sea Level Change on the Molecular Isotopic Composition Sediments Cretaceous Western Interior Seaway Oceanic Anoxic Event 3 Mesa Verde CO USA
2014/10/22
Cretaceous Oceanic Anoxic Events (OAEs) represent periods of enhanced burial of organic matter in black shale in marine, continental margin, and epicontinental settings around the globe. Compared to o...
Shale-Derived Dissolved Organic Mattr as a Substrate for Subsurface Methanogenic Communities in the Antrim Shale, Michigan Basin, USA
Shale-Derived Dissolved Organic Matter as a Substrate Subsurface Methanogenic Communities Antrim Shale Michigan Basin USA
2014/10/22
The microbial origin of methane produced from sedimentary basins is a subject of great interest, with implications for the global cycling of carbon as well as natural gas exploration. Despite the grow...
The Role of Fluids in Promoting Seismic Activity in Active Spreading Centers of the Salton Trough, California, USA
Crustal Model Magmatic Intrusion Salton Trough Seismic Activity Spreading Centers
2013/3/7
We interpret seismic activity in the active spreading centers of the Salton Trough to indicate 1) a magmatic intrusion in the lower crust beneath the active Brawly, Cerro Prieto, Imperial, Elsinore, a...
A spatial resolution threshold of land cover in estimating terrestrial carbon sequestration in four counties in Georgia and Alabama, USA
land cover terrestrial carbon sequestration Georgia and Alabama, USA
2010/1/21
Changes in carbon density (i.e., carbon stock per unit area) and land cover greatly affect carbon sequestration. Previous studies have shown that land cover change detection strongly depends on spatia...
Rockfall hazard and risk assessment in the Yosemite Valley, California, USA
Rockfall hazard risk assessment the Yosemite Valley, California, USA
2009/12/10
Rock slides and rock falls are the most frequent types of slope movements in Yosemite National Park, California. In historical time (1857–2002) 392 rock falls and rock slides have been documented in t...
Contrasting carbon dioxide fluxes between a drying shrub wetland in Northern Wisconsin,USA,and nearby forests
carbon dioxide fluxes shrub wetland Northern Wisconsin
2010/1/20
Wetland biogeochemistry is strongly influenced by water and temperature dynamics, and these interactions are currently poorly represented in ecosystem and climate models. A decline in water table of a...
Dendrogeomorphically derived slope response to decadal and centennial scale climate variability: Black Mesa, Arizona, USA
slope response decadal and centennial scale climate variability
2009/12/30
A major impediment to an understanding of the links between climate and landscape change, has been the relatively coarse resolution of landscape response measures (rates of weathering, sediment produc...
Investigation and hazard assessment of the 2003 and 2007 Staircase Falls rock falls, Yosemite National Park, California, USA
the 2003 and 2007 Staircase Falls rock falls Yosemite National Park
2009/12/30
Since 1857 more than 600 rock falls, rock slides, debris slides, and debris flows have been documented in Yosemite National Park, with rock falls in Yosemite Valley representing the majority of the ev...
Modelling historical and recent mass loss of McCall Glacier,Alaska,USA
historical and recent mass loss McCall Glacier
2010/2/4
Volume loss of valley glaciers is now considered to be a significant contribution to sea level rise. Understanding and identifying the processes involved in accelerated mass loss are necessary to dete...
Drainage effects on the transient,near-surface hydrologic response of a steep hillslope to rainfall:implications for slope stability,Edmonds,Washington,USA
Drainage effects transient near-surface hydrologic response steep hillslope
2009/12/29
Shallow landslides on steep (>25°) hillsides along Puget Sound have resulted in occasional loss of life and costly damage to property during intense or prolonged rainfall. As part of a larger project ...
Calibration of numerical models for small debris flows in Yosemite Valley,California,USA
Calibration numerical models small debris flows Yosemite Valley
2009/12/29
This study compares documented debris flow runout distances with numerical simulations in the Yosemite Valley of California, USA, where about 15% of historical events of slope instability can be class...