Results 41 to 50 of about 5,310 (122)

Lithogeochemistry and 3D geological modeling of the apatite-bearing Mesquita Sampaio beforsite, Jacupiranga alkaline complex, Brazil

Brazilian Journal of Geology, 2020
The Mesquita Sampaio beforsite is a mineral exploration area with apatite mineralization occurring near the northern portion of the Morro da Mina apatite deposit (Cajati Mine), in the Jacupiranga Alkaline Complex.
Saulo Batista de Oliveira, Lilia Mascarenhas Sant'Agostino   +1 more
doaj   +1 more source

Lithological structure of western Pacific lithosphere reconstructed from mantle xenoliths in a petit-spot volcano

Progress in Earth and Planetary Science, 2022
The lithospheric mantle, formed at the mid-ocean ridge as a residue of crustal production, comprises theoretically depleted peridotite, but more fertile components (e.g., lherzolite and pyroxenite) have been reported, creating an enigmatic picture of the
Kazuto Mikuni, Naoto Hirano, Norikatsu Akizawa, Junji Yamamoto, Shiki Machida, Akihiro Tamura, Yuuki Hagiwara, Tomoaki Morishita   +7 more
doaj   +1 more source

Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints

Open Geosciences, 2017
We examined the petrography, petrology, and geochemistry of two types of gabbroic xenoliths (A- and B-type xenoliths) in olivine basalt and biotite rhyolite units among the dominantly rhyolitic rocks in Niijima volcano, northern Izu-Bonin volcanic arc ...
Arakawa Yoji, Endo Daisuke, Ikehata Kei, Oshika Junya, Shinmura Taro, Mori Yasushi   +5 more
doaj   +1 more source

Rare earth element characteristics of pyrope garnets from the Kaavi-Kuopio kimberlites - implications for mantle metasomatism [PDF]

Bulletin of the Geological Society of Finland, 2005
Peridotitic garnet xenocrysts from five kimberlite pipes in the Kaavi-Kuopio area of eastern Finland have been studied using major and trace element geochemistry to obtain information on the stratigraphy, compositional variability and evolutionary ...
M. Lehtonen
doaj   +1 more source

Early Cretaceous Surtseyan volcanoes of the Baño Nuevo Volcanic Complex (Aysén Basin, Eastern Central Patagonian Cordillera, Chile)

Geologica Acta, 2010
Tens of Surtseyan tuff cones are exposed in the Río Coichel valley, between Ñireguao and Estancia Baño Nuevo (Southern Chilean Andes). The Early Cretaceous products of the submarine eruptions rest on, or are interbedded with, shallow marine sandstones of
A. DEMANT, M. SUÁREZ, R. DE LA CRUZ, O. BRUGUIER   +3 more
doaj  

Evidence for suboceanic small-scale convection from a “garnet”-bearing lherzolite xenolith from Aitutaki Island, Cook Islands

Progress in Earth and Planetary Science
Garnet peridotite xenoliths have been rarely reported from suboceanic mantle. Petrographic and geochemical characteristics of garnet-bearing oceanic peridotite xenoliths provide precious information on dynamics of the suboceanic lithosphere and ...
Norikatsu Akizawa, Kazuhito Ozawa, Tetsu Kogiso, Akira Ishikawa, Akira Miyake, Yohei Igami, Simon R. Wallis, Takayoshi Nagaya, Chihiro Ohshima, Ryo Fujita, Tatsuhiko Kawamoto, Akihiro Tamura, Tomoaki Morishita, Shoji Arai, Atsushi Yasumoto   +14 more
doaj   +1 more source

Convective Instability in Intraplate Oceanic Mantle Caused by Amphibolite-Derived Garnet-Pyroxenites—A Xenolith Perspective (Hyblean Plateau, Sicily)

Geosciences, 2020
Geochemical characteristics of middle ocean ridge basalts (MORBs) testify partial melting of spinel-peridotite mixed with a few amounts of garnet-pyroxenite.
Vittorio Scribano, Serafina Carbone
doaj   +1 more source

Heat Generation in Cratonic Mantle Roots—New Trace Element Constraints From Mantle Xenoliths and Implications for Cratonic Geotherms

Geochemistry, Geophysics, Geosystems, 2021
Heat generation within the cratonic lithospheric mantle (CLM) is an important but poorly determined parameter for constructing cratonic geotherms. Direct measurement of heat producing element (HPE: K, U, and Th) concentrations in bulk‐rock samples of ...
T. McIntyre, K. Kublik, C. Currie, D. G. Pearson   +3 more
doaj   +1 more source

A reference Earth model for the heat producing elements and associated geoneutrino flux [PDF]

arXiv, 2013
The recent geoneutrino experimental results from KamLAND and Borexino detectors reveal the usefulness of analyzing the Earth geoneutrino flux, as it provides a constraint on the strength of the radiogenic heat power and this, in turn, provides a test of compositional models of the bulk silicate Earth (BSE).
arxiv  

Thermal Structure of Eastern Australia's Upper Mantle and Its Relationship to Cenozoic Volcanic Activity and Dynamic Topography

Geochemistry, Geophysics, Geosystems, 2021
Spatio‐temporal changes of upper mantle structure play a significant role in generating and maintaining surface topography. Although geophysical models of upper mantle structure have become increasingly refined, there is a paucity of geologic constraints
P. W. Ball, K. Czarnota, N. J. White, M. Klöcking, D. R. Davies   +4 more
doaj   +1 more source