Results 51 to 60 of about 2,685 (149)
Resources, 2018 W.G. Lindgren in 1933 first noted that a belt of alkaline-igneous rocks extends along the eastern edge of the Rocky Mountains and Basin and Range provinces from Alaska and British Columbia southward into New Mexico, Trans-Pecos Texas, and eastern Mexico ...
Virginia T. McLemore
doaj +1 more source
Stable carbon and oxygen isotopic compositions of Indian carbonatites
, 2006 Stable carbon and oxygen isotopic compositions of carbonatites are results of fractionation caused by various magmatic and post-magmatic processes during their generation and evolution.
R. Ramesh +3 more
core +1 more source
MINERALS ASSOTIATIONS AND COMPOSITIONAL HETEROGENEITY OF ZIRCON FROM MIASKITE-CARBONATITE COMPLEX OF THE VISHNEVYe MOUNTAINS, SOUTH URALS [PDF]
Минералогия, 2019 In alkaline rocks, pegmatites and carbonatites of the Vishnevye Mountains, zircons co-crystallized with rock-forming silicates (feldspars, nepheline, annite, etc.), as well as with some other minerals (pyrochlore, magnetite, ilmenite, apatite, monazite ...
V.I. Popova, V.A. Popov, V.A. Kotlyarov
doaj +1 more source
The distribution and generation of carbonatites [PDF]
The physio-chemical framework that generates carbonatites and, ultimately, the associated rare earth element deposits remains contentious. This primarily reflects the diverse tectonic settings in which carbonatites occur: large igneous provinces ...
core +3 more sources
Rapid Communications in Mass Spectrometry, Volume 40, Issue 18, 30 September 2026.ABSTRACT Rationale Approximately 3–4 kg of NBS 19 limestone, prepared in 1982 by the U.S. Geological Survey (USGS), serves as a primary reference for the carbon isotope scales VPDB and VPDB‐LSVEC and the oxygen isotope scale VPDB. Its consensus values are +1.95‰ for δ13C and −2.2‰ for δ18O measurements.
Haiping Qi +3 more
wiley +1 more source
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 9, September 2026.Abstract We investigate late Holocene changes in the northern Benguela Upwelling System using a multi‐proxy approach on shallow shelf deposits from the Namibian mud belt. Three sediment cores characterized by organic carbon‐rich, anoxic, and partly gas‐bearing sediments were retrieved along a sampling transect at 23°S in August 2019.
Michael Kossack +5 more
wiley +1 more source
Earth and Space Science, Volume 13, Issue 8, August 2026.Abstract An audiomagnetotelluric (AMT) survey was conducted within the Alto Paranaíba Igneous Province, southeastern Brazil, to delineate shallow occurrences of kamafugite, a rare ultrapotassic volcanic rock worldwide. A dense grid of AMT stations was deployed, allowing the construction of a high‐resolution 3D electrical resistivity model ...
Lucca M. Franco +6 more
wiley +1 more source
, 2017 Many carbonatites are associated both spatially and temporally with large igneous provinces (LIPs), and considered to originate from a mantle plume source lacking any contribution from recycled crustal materials.
Huang, KangJun +11 more
core +1 more source
A Graphical User Interface Application to Model Open‐System Melting in the Upper Mantle
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.Abstract The mantle partial melting process is crucial for the physicochemical evolution of the Earth's upper mantle and the generation of mafic crust. The open‐system melting model incorporates continuous melt segregation, interaction with melts or fluids, and crystallization of trapped melt and therefore provides a comprehensive model for simulating ...
I. Nishio +4 more
wiley +1 more source
The bimodal composition of carbonatites: Reality or misconception?
, 2005 The concept of compositional bimodality in carbonatites has become widely accepted and has been used to impose restrictions on the composition of carbonatite magmas.
Gittins, J. +2 more
core +1 more source