Results 61 to 70 of about 59,876 (275)

High‐Titanium Zircon Rims in Rhyolite – A Reflection of Adiabatic Ascent?

Geological Journal, EarlyView.
The ascent of granitic magma from source to emplacement is rapidly achieved through dyking, resulting in negligible heat loss to the surrounding wallrock (i.e., adiabatic). Zircon growth during ascent can record the changing magma conditions including adiabatic cooling and heating, resulting in high titanium rims on low titanium cores without ...
Carson Kinney, Holden Little, Chris Yakymchuk   +2 more
wiley   +1 more source

Geochemical Constraints on the Structure of the Earth's Deep Mantle and the Origin of the LLSVPs

Geochemistry, Geophysics, Geosystems, 2021
Geophysical analysis of the Earth's lower mantle has revealed the presence of two superstructures characterized by low shear wave velocities on the core‐mantle boundary.
Matthew Gleeson, Caroline Soderman, Simon Matthews, Sanne Cottaar, Sally Gibson   +4 more
doaj   +1 more source

Origins of the Pangkaimen Au Deposit in the Northern Great Xing'an Range, China: Evidence From Geochronological, Geochemical, Fluid Inclusion, and H–O–S–Pb Isotope Data

Geological Journal, EarlyView.
The Pangkaimen Au–Ag deposits belong to the epithermal Au deposits, which are of great significance for guiding the research and development of this type of gold deposit. Metallogenic model diagram of Pangkaimen Au–Ag deposit. ABSTRACT The gold (Au) metallogenic belt in the northern Great Xing'an Range is characterised by the wide occurrence of the ...
Sheng Lu, Hongpeng Chen, Chenglu Li, Ye Wang, Tiesheng Li, Rigen Wu, Zengtao Li, Zhichao Song, Xiannan Zhu   +8 more
wiley   +1 more source

Deglaciation-enhanced mantle CO2 fluxes at Yellowstone imply positive climate feedback

Nature Communications
Mantle melt generation in response to glacial unloading has been linked to enhanced magmatic volatile release in Iceland and global eruptive records. It is unclear whether this process is important in systems lacking evidence of enhanced eruptions.
Fiona Clerc, Mark D. Behn, Brent M. Minchew   +2 more
doaj   +1 more source

Petrology of some oceanic island basalts: PRIMELT2.XLS software for primary magma calculation [PDF]

, 2008
PRIMELT2.XLS software is introduced for calculating primary magma composition and mantle potential temperature (TP) from an observed lava composition. It is an upgrade over a previous version in that it includes garnet peridotite melting and it detects ...
Asimow, Paul D., Herzberg, C.
core   +2 more sources

Evidence From Microscopy and U–Pb Geochronology as a Clue to the Influence of the Cretaceous Magmatism in the Diagenesis of Pre‐Salt Carbonate Reservoirs in the Santos Basin (Brazil)

Geological Journal, EarlyView.
Carbonates from Santos Basin revealed U–Pb ages correlated with basalt ages (A), suggesting that they were formed during magmatic events. These events placed hot CO2 in the reservoir, which, when mixed with carbonate‐rich cold water (B), led to thermal convection, enabling the formation of the U contained in the carbonates.
Marco António Ruivo de Castro e Brito, Cristiano Leite Sombra, Davy Raeder Brandão, Cleverson Guizan Silva, Sidney Luiz de Matos Mello, Eugênio Vaz dos Santos Neto, Rui Jorge Fernandes Baptista, Ramsés Capilla, Luiz Antônio Pierantoni Gambôa   +8 more
wiley   +1 more source

Granite magmatism and mantle filiation [PDF]

European Journal of Mineralogy
Current granite magma generation models essentially reduce to two groups: (1) intra-crustal melting and (2) basaltic origin. A mixed, crustal, and basaltic origin and therefore a mantle filiation has been proposed for most granite magma types.
M. Pichavant, A. Villaros, J. A.-S. Michaud, B. Scaillet   +3 more
doaj   +1 more source

Glacial cycles drive variations in the production of oceanic crust

, 2014
Glacial cycles redistribute water between oceans and continents causing pressure changes in the upper mantle, with consequences for melting of Earth's interior.
Crowley, John W., Huybers, Peter J., Katz, Richard F., Langmuir, Charles H., Park, Sung-Hyun   +4 more
core   +1 more source

Poly(sarcosine) Lipid Synthesis From CO2‐Based Sarcosine‐N‐Carboxyanhydride

Macromolecular Rapid Communications, EarlyView.
In this work, we optimize and scale‐up a CO2‐based synthesis of sarcosine‐N‐carboxyanhydride (Sar‐NCA) to the gram scale. The low toxicity and simplicity of the approach make it an attractive alternative to current toxic phosgene‐based approaches. The CO2‐based Sar‐NCA has sufficient purity for controlled polymerization.
Florian T. Kaps, Leon Quellmalz, Annika D. S. Richardson, Anna‐Lena Ziegler, Sarah Moreau, Susanne K. Wiedmer, Timo Repo, Robert Luxenhofer   +7 more
wiley   +1 more source

The constant oxidation state of Earth’s mantle since the Hadean

Nature Communications
Determining the evolutionary history of mantle oxygen fugacity (fo2) is crucial, as it controls the fo2 of mantle-derived melts and regulates atmospheric composition through volcanic outgassing. However, the evolution of mantle fo2 remains controversial.
Fangyi Zhang, Vincenzo Stagno, Lipeng Zhang, Chen Chen, Haiyang Liu, Congying Li, Weidong Sun   +6 more
doaj   +1 more source