Results 121 to 130 of about 780,612 (368)
Mineralogy and Geology of asteroid (4) Vesta from Dawn Framing Camera [PDF]
This thesis presents insights into the surface compositional heterogeneity and geology of asteroid Vesta. Lithologic mapping using Framing Camera onboard the NASA Dawn spacecraft revealed that the majority of the surface is howarditic in composition (Thangjam et al. 2013).
arxiv
Active megadetachment beneath the western United States [PDF]
Geodetic data, interpreted in light of seismic imaging, seismicity, xenolith studies, and the late Quaternary geologic history of the northern Great Basin, suggest that a subcontinental-scale extensional detachment is localized near the Moho.
Allmendinger+172 more
core +2 more sources
De Geer moraines may act as valuable ice‐marginal indicators; however, to date, their variable mode of formation has presented challenges for this utility. Here, we present sedimentological and ground penetrating radar data of DGMs located in southwest Finland.
Gwyneth E. Rivers+5 more
wiley +1 more source
The Distribution of Basaltic Asteroids in the Main Belt [PDF]
We present the observational results of a survey designed to target and detect asteroids whose colors are similar to those of Vesta family members and thus may be considered as candidates for having a basaltic composition. Fifty basaltic candidates were selected with orbital elements that lie outside of the Vesta dynamical family.
arxiv +1 more source
A study of ignimbrites in the Cordilleran region as a basis for interpretation of lunar plains [PDF]
Progress in a study of lunar topography and geology by analyzing and mapping the earth's mantle is presented. Data from the study are used for the construction of a 600 page lunar topographic atlas.
Clabaugh, S. E.
core +1 more source
Temporal relations between mineral deposits and global tectonic cycles [PDF]
Natural Environment Research Council (grant NE/J021822/1) supported this research.Mineral deposits are heterogeneously distributed in both space and time, with variations reflecting tectonic setting, evolving environmental conditions, as in the ...
Cawood, Peter Anthony+1 more
core +2 more sources
Recent Advances in Understanding the Geology of Diamonds
It has been more than two decades since diamond ages have proven to be up to billions of years older than their host magmas of kimberlite or lamproite.
S. Shirey, J. Shigley
semanticscholar +1 more source
Divergent views debated over the past 20 years on the Wolstonian depositional record of Fenland and the Peterborough area have centred on whether there is evidence of a single (middle or late) glaciation or of both a middle and a late glaciation. A recent review promoted a single late Wolstonian glaciation, despite there being incontrovertible evidence
Harry E. Langford
wiley +1 more source
Modeling pN2 through Geological Time: Implications for Planetary Climates and Atmospheric Biosignatures [PDF]
Nitrogen is a major nutrient for all life on Earth and could plausibly play a similar role in extraterrestrial biospheres. The major reservoir of nitrogen at Earth's surface is atmospheric N2, but recent studies have proposed that the size of this ...
Buick, R.+5 more
core +2 more sources
Neogene plate tectonic reconstructions and geodynamics of North Island sedimentary basins: Implications for the petroleum systems [PDF]
Although the modern Australia-Pacific plate boundary through New Zealand is relatively straight, there have been significant changes in its geometry during the Neogene. Within the North Island sector there has been a fundamental transition from an Alpine
Furlong, Kevin P., Kamp, Peter J.J.
core +1 more source