Results 91 to 100 of about 784,658 (343)

Modeling pN2 through Geological Time: Implications for Planetary Climates and Atmospheric Biosignatures [PDF]

, 2016
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., Johnson, B., Kipp, M. A., Koehler, M. C., Schwieterman, E. W., Stüeken, E. E.   +5 more
core   +2 more sources

Morphology and sedimentology of murtooized terrain on the southern Fraser Plateau, British Columbia, Canada

Boreas, EarlyView.
Recent public releases of Light Detection and Ranging (LiDAR) data in south central British Columbia (BC), Canada have revealed several landforms resembling ‘murtoos’, previously identified across portions of Scandinavia. In this study, we investigate the morphology and sedimentology of these landforms, the first report of their kind associated with ...
Alexander D. Sodeman, Tracy A. Brennand
wiley   +1 more source

Geochronology and geochemistry of the intrusive rocks in Yucun Au deposit, Jiangnan Transition Belt, Eastern China: Constraints on their petrogenesis, geodynamical setting and mineralization

Solid Earth Sciences, 2020
A large number of Au polymetallic deposits have been mined in the Jiangnan Transition Belt (JTB), Eastern China. However, the formation and genesis of these Au polymetallic deposits remain unclear.
Shanshan Chen, Xiaoyong Yang, Zhuang Zhao, Huasheng Qi, Lei Shi   +4 more
doaj  

Problems and Solutions when Quantifying Nitrogen in Silicate and Oxide Minerals and Glasses Using Electron Probe Microanalysis

Geostandards and Geoanalytical Research, EarlyView.
Key Points The challenges of quantifying nitrogen in silicates by EPMA are explained and assessed. Using a set of known and newly synthesised reference materials, we demonstrate a method for obtaining accurate nitrogen mass fractions in most samples.
Eleanor R. Mare, Jeff Chen, Iris Buisman, Chris Hayward, Antony D. Burnham, Caterina Melai, Eva E. Stüeken, Geoffrey Bromiley, Sami Mikhail   +8 more
wiley   +1 more source

A three-dimensional Moho depth model beneath the Yemeni highlands and rifted volcanic margins of the Red Sea and Gulf of Aden, Southwest Arabia

China Geology, 2023
Knowing Moho discontinuity undulation is fundamental to understanding mechanisms of lithosphere-asthenosphere interaction, extensional tectonism and crustal deformation in volcanic passive margins such as the study area, which is located in the ...
Amin Noman Al Kadasi
doaj  

Boninite and Harzburgite from Leg 125 (Bonin-Mariana Forearc): A Case Study of Magma Genesis during the Initial Stages of Subduction [PDF]

, 1992
Holes drilled into the volcanic and ultrabasic basement of the Izu-Ogasawara and Mariana forearc terranes during Leg 125 provide data on some of the earliest lithosphere created after the start of Eocene subduction in the Western Pacific.
Arculus, Richard J., Ishii, Teruaki, Murton, Bramley J., Parkinson, Ian J., Pearce, Julian A., Peate, David W., van der Laan, Sieger R.   +6 more
core   +1 more source

The Geology of New Guinea - The Cordilleran Margin of the Australian Continent

, 2012
The island of New Guinea is the mountainous margin of the Australian continent. Paleozoic and Proterozoic Australian craton extends northward beneath the shallow waters of the Arafura Sea to underlie the southern plains of New Guinea and, with overlying ...
H. Davies
semanticscholar   +1 more source

Improved Precision and Reference Materials for Stable Carbon Isotope Measurement in Basaltic Glasses using Secondary Ion Mass Spectrometry

Geostandards and Geoanalytical Research, EarlyView.
Key Points High‐precision measurement results for δ13C in basaltic glasses were achieved down to 25 μg g‐1 CO2 using a refined measurement procedure via large‐geometry SIMS. Three new hydrous basaltic glasses (ETNA24, ETNA32, ETNA36) were established as reference materials.
Joshua Shea, Ery Hughes, Robert Balzer, Ilya Bindeman, Jon Blundy, Richard Brooker, Roman Botcharnikov, Pierre Cartigny, EIMF, Glenn Gaetani, Geoff Kilgour, John Maclennan, Brian Monteleone, David A. Neave, Oliver Shorttle   +14 more
wiley   +1 more source

Carbon depth cycle and formation of abiogenic hydrocarbons

Известия Томского политехнического университета: Инжиниринг георесурсов, 2018
The relevance. Identification of mechanisms of carbon metamorphic transformation in convergent and divergent regions of the Earth, assessment of the scale of deep transport and the transfer on the generation of abiogenic hydrocarbons in tectonic ...
Nickolay O. Sorokhtin, Leopold I. Lobkovsky, Igor Petrovich Semiletov   +2 more
doaj   +2 more sources

Arctic Tectonics and Volcanism: a multi-scale, multi-disciplinary educational approach [PDF]

Geoscience Communication
Geologically, the Arctic is one of the least-explored regions of Earth. Obtaining data in the high Arctic is logistically, economically, and environmentally expensive, but the township of Longyearbyen (population of 2617 as of 2024) at 78° N represents a
K. Senger, K. Senger, G. Shephard, G. Shephard, F. Ammerlaan, F. Ammerlaan, O. Anfinson, P. Audet, B. Coakley, V. Ershova, J. I. Faleide, S.-A. Grundvåg, S.-A. Grundvåg, R. K. Horota, K. Iyer, J. Janocha, J. Janocha, M. Jones, M. Jones, A. Minakov, M. Odlum, A. Sartell, A. Sartell, A. Schaeffer, D. Stockli, M. A. Vander Kloet, M. A. Vander Kloet, C. Gaina   +27 more
doaj   +1 more source