Results 51 to 60 of about 6,298 (230)

Origin of Ultrapotassic, Ultracalcic, Ultrabasic SiO2‐Undersaturated Magmas: The Case Study of the Pleistocene Cupaello Kamafugite Monogenetic Volcano, Central Italy

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 1, January 2025.
Abstract The Pleistocene (∼0.6 Ma) Cupaello monogenetic volcano, cropping out in central Italy, belongs to the Intra Apennine Province (IAP). It is represented by a single lava flow with kamafugitic composition, associated with a volumetrically limited pyroclastic deposit and a phosphate‐rich layer close to the small vent.
Michele Lustrino, Lorenzo Pistocchi, Sara Ronca, Francesca Innocenzi, Samuele Agostini   +4 more
wiley   +1 more source

Hydrothermal Surface-Wave Instability and the Kuramoto-Sivashinsky Equation [PDF]

, 1994
We consider a system formed by an infinite viscous liquid layer with a constant horizontal temperature gradient, and a basic nonlinear bulk velocity profile. In the limit of long-wavelength and large nondimensional surface tension, we show that hydrothermal surface-wave instabilities may give rise to disturbances governed by the Kuramoto-Sivashinsky ...
arxiv   +1 more source

Major, Trace, and Rare-Earth Element Geochemistry of Nb-V Rich Andradite-Schorlomite-Morimotoite Garnet from Ambadungar-Saidivasan Alkaline Carbonatite Complex, India: Implication for the Role of Hydrothermal Fluid-Induced Metasomatism [PDF]

, 2021
Amiya K. Samal, Rajesh K. Srivastava, Dewashish Upadhyay   +2 more
openalex   +1 more source

Rear polymineral zone of near-veined metasomatic aureole in mesothermal Zun-Holba gold deposit (Eastern Sayan) [PDF]

, 2015
Unique data of the mineralogical and petrochemical zoning of near- veined metasomatic aureole of mesothermal Zun-Holba gold deposit are presented and discussed.
Abramova, Raisa Nikolaevna, Cherkasova, Tamara Yurievna, Kucherenko, Igor Vasilyevich   +2 more
core   +1 more source

Rare‐Earth Mineralization in Dong Pao Deposit, Laichau Province, Vietnam

Resource Geology, Volume 75, Issue 1, January‐December 2025.
ABSTRACT The Dong Pao deposit in northern Vietnam is associated with the Paleogene Dong Pao Syenite Complex, which intruded into the limestone of the Triassic age. Although the Dong Pao deposit has been attracting exploration for decades as a promising rare earth deposit, it has not been well studied in terms of mineralization style and formation ...
Tinh Thanh Bui, Yasushi Watanabe, Carmela Alen J. Tupaz, Takuya Echigo, Shogo Aoki, Mihoko Hoshino   +5 more
wiley   +1 more source

Thorium (Th) alteration veins in the Northern Trondheimfjord area [PDF]

, 2017
Th-alteration of red carbonate veins within Ytterøy island in the northern Trondheimfjord area was investigated by focusing on field work, mineral chemistry and geochemistry.
Mutasingwa, Almachius
core  

Episodic Seafloor Hydrothermal Alteration as a Source of Stable Remagnetizations in Archean Volcanic Rocks

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 12, December 2024.
Abstract Interpreting the paleomagnetic records of altered rocks, especially those from Earth's earliest history, is complicated by metamorphic overprints and recrystallization of ferromagnetic minerals. However, these records may be as valuable as a primary signal if the timing and mechanism of alteration‐related remagnetizations can be ascertained ...
A. R. Brenner, R. R. Fu, A. J. Brown, E. B. Hodgin, D. T. Flannery, Mark D. Schmitz   +5 more
wiley   +1 more source

Assessment of Natural Reference Materials for U‐Pb Geochronology of Grossular‐Andradite Garnet

Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 909-925, December 2024.
Key Points Refined ID‐TIMS procedures are combined with a micro sampling approach to produce high resolution (ca. 0.1%) U‐Pb ID‐TIMS dates from garnet. Calibration of new reference materials Jumbo andradite and Tiptop andradite. Additional calibration and documentation of the inhomogeneity of the Willsboro‐Lewis andradite reference material.
Carl J. Beno, Jade Star Lackey, Mark D. Schmitz, John R. Bowman, Michael A. Stearns, John M. Bartley, Diego P. Fernandez   +6 more
wiley   +1 more source

Quartz- Porphyry Dolerite in A Selected Part of Southern Benue Trough, Nigeria [PDF]

, 2020
The dolerites in some parts of southern Benue Trough were studied petrographically. The results show that most of the dolerites in the Anambra and Afikpo basins are olivine dolerites except Umuchieze LokpaUkwu that host mostly quartz porphyry dolerites ...
J. N., Onwualu-John,, O. P., Offodile,
core   +1 more source

Extreme Mantle Heterogeneity Revealed by Geochemical Investigation of In Situ Lavas at the Central Mohns Ridge, Arctic Mid‐Ocean Ridges

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 11, November 2024.
Abstract Mid‐ocean ridge basalts reflect the mantle’s composition and reveal processes from melting to eruption. The Mohns and Knipovich Ridges have ultraslow spreading rates, low magma budgets and erupted lavas indicating various mantle domains. Here, we use geochemistry and isotope systematics of in situ samples from two axial volcanic ridges (AVRs ...
Håvard Hallås Stubseid, Anders Bjerga, Leif‐Erik Rydland Pedersen, Rolf Birger Pedersen   +3 more
wiley   +1 more source