Results 81 to 90 of about 14,584 (265)

Mantle Xenolith Evidence for Lithospheric Thinning and Metasomatic Modification Beneath the Eastern Fiji Plateau: Implications for Samoan Plume Supply, Intraplate Volcanism, and Orocline Formation

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
We provide petrographic and geochemical characterisation of mantle xenoliths from Koro Island, eastern Fiji. Several lherzolite xenoliths display spinel–pyroxene symplectite textures, including preserved former grain boundaries, consistent with garnet breakdown that we attribute to thinning of a preexisting garnet‐facies lithospheric mantle beneath ...
Natasha Barrett, Stephen T. Johnston, Neil N. Kumar, Holger Sommer, D. Graham Pearson   +4 more
wiley   +1 more source

Tracing Deep Carbon Cycling by Zinc Isotopes in a Peralkaline‐Carbonatite Suite

Geochemistry, Geophysics, Geosystems
Sedimentary carbonates are known to be carried into the deep mantle by subducted slabs, and studies on mantle‐derived magmas have attempted to trace the recycled carbonate in their mantle source.
Bowen Wei, Zhaochong Zhang, Zhiguo Cheng, Qiuhong Xie, M. Santosh, Weiliang Kong, Bingxiang Liu, Marc K. Reichow, Yingjie Li   +8 more
doaj   +1 more source

Characterisation of Pelletal Lapilli in Explosive Melilitite–Carbonatite Eruptions: An Example from Mt. Vulture Volcano (Southern Italy)

Geosciences
Among the volcaniclastic products of melilitite–carbonatite eruptions, pelletal lapilli are often found, resulting in them being particularly useful for characterising the interface between the erupting magma and its volatile component. Pelletal lapilli,
Gabriele Carnevale, Vittorio Zanon
doaj   +1 more source

Portland clinker production with carbonatite waste and tire-derived fuel: crystallochemistry of minor and trace elements [PDF]

Cerâmica, 2014
This paper presents results on the composition of Portland clinkers produced with non-conventional raw-materials and fuels, focusing on the distribution of selected trace elements.
F. R. D. Andrade, M. Pecchio, J. M. C. Santos, Y. Kihara   +3 more
doaj  

Italian carbonatite system: From mantle to ore-deposit

Ore Geology Reviews, 2019
A new discovery of carbonatites at Pianciano, Ficoreto and Forcinelle in the Roman Region demonstrates that Italian carbonatites are not just isolated, mantle xenoliths-bearing, primitive diatremic rocks but also evolved subtype fluor-calciocarbonatite ...
F. Stoppa, M. Schiazza, G. Rosatelli, F. Castorina, V. Sharygin, Francesco Ambrosio, Noemi Vicentini   +6 more
semanticscholar   +1 more source

REE minerals at the Songwe Hill carbonatite, Malawi: HREE-enrichment in late-stage apatite

, 2017
Compared to all published data from carbonatites and granitoids, the fluorapatite compositions in the Songwe Hill carbonatite, determined by EPMA and LA ICP-MS, have the highest heavy (H)REE concentration of any carbonatite apatite described so far.
S. Broom-Fendley, A. Brady, F. Wall, G. Gunn, W. Dawes   +4 more
semanticscholar   +1 more source

A Spectral and Spatial Comparison of Satellite-Based Hyperspectral Data for Geological Mapping

Remote Sensing
The new generation of satellite hyperspectral (HS) sensors provides remarkable potential for regional-scale mineralogical mapping. However, as with any satellite sensor, mapping results are dependent on a typically complex correction procedure needed to ...
Rupsa Chakraborty, Imane Rachdi, Samuel Thiele, René Booysen, Moritz Kirsch, Sandra Lorenz, Richard Gloaguen, Imane Sebari   +7 more
doaj   +1 more source

Archean crust-mantle geochemical differentiation [PDF]

Isotope measurements on carbonatite complexes and komatiites can provide information on the geochemical character and geochemical evolution of the mantle, including the sub-continental mantle.
Tilton, G. R.
core   +1 more source

Studies in synthetic carbonatite systems: Solidus relationships for CaO-MgO-CO_2-H_2O to 40 kbar and CaO-MgO-SiO_2-CO_2-H_2O to 10 kbar [PDF]

, 1980
The system CaO-MgO-SiO_2-CO_2-H_2O is an important model for many igneous and metamorphic processes, including the generation and differentiation of carbonatite and associated silicate magmas.
Boettcher, A. L., Robertson, J. K., Wyllie, P. J.   +2 more
core  

Light rare earth element redistribution during hydrothermal alteration at the Okorusu carbonatite complex, Namibia

Mineralogical magazine, 2019
The Cretaceous Okorusu carbonatite, Namibia, includes diopside-bearing and pegmatitic calcite carbonatites, both exhibiting hydrothermally altered mineral assemblages.
Delia Cangelosi, S. Broom-Fendley, D. Banks, D. Morgan, B. Yardley   +4 more
semanticscholar   +1 more source