Results 61 to 70 of about 330,203 (416)

EarthN: A new Earth System Nitrogen Model [PDF]

, 2018
The amount of nitrogen in the atmosphere, oceans, crust, and mantle have important ramifications for Earth's biologic and geologic history. Despite this importance, the history and cycling of nitrogen in the Earth system is poorly constrained over time ...
Condie K. C., Delwiche C., Garcia H., German C., Gruber N., Halama R., Haynes W., Rudnick R., Winter J. D.   +8 more
core   +3 more sources

Isolated Neutron Stars as Science Validation for XMM2ATHENA: Ensuring Robust Data for Future X‐Ray Astronomy

Astronomische Nachrichten, EarlyView.
ABSTRACT The discovery of radio‐quiet, x‐ray thermally emitting isolated neutron stars (XINSs) in the ROSAT All‐Sky Survey revealed a previously overlooked component of the neutron star population. Advancements in x‐ray instrumentation and the availability of deep, wide‐area optical surveys now enable us to explore XINSs at fainter x‐ray fluxes and ...
Adriana Mancini Pires, Christian Motch, Axel Schwope, Iris Traulsen, Jean Ballet, Sudip Chakraborty, David Homan, Jan Kurpas, Ada Nebot Gomez‐Moràn, François‐Xavier Pineau, Hugo Tranin, Natalie Webb   +11 more
wiley   +1 more source

High‐Resolution Data Sets for Global Carbonate and Silicate Rock Weathering Carbon Sinks and Their Change Trends

Earth's Future, 2022
The Carbonate rock weathering Carbon Sink (CCS) and Silicate rock weathering Carbon Sink (SCS) play a significant role in the carbon cycle and global climate change.
Lian Xiong, Xiaoyong Bai, Cuiwei Zhao, Yangbin Li, Qiu Tan, Guangjie Luo, Luhua Wu, Fei Chen, Chaojun Li, Chen Ran, Huipeng Xi, Xuling Luo, Huan Chen, Sirui Zhang, Ming Liu, Suhua Gong, Biqin Xiao, Chaochao Du, Fengjiao Song   +18 more
doaj   +1 more source

Northwest Africa 5790. Top Sequence of the Nakhlite Pile [PDF]

, 2010
NWA 5790 is a recently discovered nakhlite. Its mineralogy, petrology and geochemistry suggest that it is the topmost sequence of the nakhlite lava ...
Badia, D., Barrat, J. A., Bollinger, C., Boudouma, O., Franchi, I., Greenwood, R. C., Jambon, A, Sautter, V.   +7 more
core  

New Theory of the Earth [PDF]

, 2007
New Theory of the Earth is an interdisciplinary advanced textbook on all aspects of the interior of the Earth and its origin, composition, and evolution: geophysics, geochemistry, dynamics, convection, mineralogy, volcanism, energetics and thermal ...
Anderson, Don L.
core   +2 more sources

Total Synthesis of the Membrane Spanning Tetraether Lipid brGDGT Ia and Elucidation of Its Stereochemical Configuration

Chemistry – A European Journal, EarlyView.
Branched glycerol dialkyl glycerol tetraethers (brGDGT's) are membrane‐spanning lipids produced by Acidobacteria, and used extensively in geochemistry as proxies. The first total synthesis of brGDGT Ia has been achieved, elucidating the relative stereochemical configuration of the methyl branches in the chain as syn.
Samarpita Mahapatra, Sebastian H. Kopf, Toby Halamka, Christian Merten, Deborah A. Drost, Adriaan J. Minnaard   +5 more
wiley   +1 more source

Impacts of Ocean Acidification on Sediment Processes in Shallow Waters of the Arctic Ocean

, 2014
International audienceDespite the important roles of shallow-water sediments in global biogeochemical cycling, the effects of ocean acidification on sedimentary processes have received relatively little attention.
Bio-, hydro-, and environmental geochemistry, Gazeau, F., Geochemistry, Middelburg, J.J., Pozzato, L., van Rijswijk, P.   +5 more
core   +5 more sources

Facies variations in gravelly cyclic steps deposited from turbidity currents: Miocene fan delta front deposits compared with a modern active fan delta, central Japan

The Depositional Record, EarlyView.
This paper provides a new facies model of gravelly cyclic steps that includes a facies model of lee side and variations deposited from hyperpycnal and surge‐type high‐density turbidity currents. Abstract Gravelly cyclic steps formed by turbidity currents have recently been widely recognised in the geological record.
Takeshi Nakajima, Yoshiki Saito
wiley   +1 more source

Three-stage Formation of Cap Carbonates after Marinoan Snowball Glaciation Consistent with Depositional Timescales and Geochemistry [PDF]

Nat Commun 15, 7055 (2024)
At least two global "Snowball Earth" glaciations occurred during the Neoproterozoic Era (1000-538.8 million years ago). Post-glacial surface environments during this time are recorded in cap carbonates: layers of limestone or dolostone that directly overlie glacial deposits.
arxiv   +1 more source

Petrology and geochemistry of the NWA 3368 Eucrite [PDF]

, 2006
We report the petrology and geochemistry of NWA 3368, a new non-cumulate, monomict eucrite breccia with a variety of clast sizes and a pink-tinted matrix.
Domanik, K.J., Drake, M.J., Franchi, I.A., Gardner, K.G., Goreva, J.S., Hill, D.H., Lauretta, D.S.   +6 more
core   +1 more source