Results 41 to 50 of about 25,858 (276)

Genesis of pyroxenite veins in supra-subduction zone peridotites: Evidence from petrography and mineral composition of Egiingol massif (Northern Mongolia)

China Geology, 2020
: Swarms of orthopyroxenite and websterite veins are found within Egiingol residual SSZ peridotite massif of Dzhida terrain (Central Asian Orogenic Belt, Northern Mongolia).
Anas A. Karimov, Marina A. Gornova, Vasiliy A. Belyaev, Aleksander Ya. Medvedev, Nikolay V. Bryanskiy   +4 more
doaj   +1 more source

Petrology, Geochemical Characteristics, Tectonic Setting, and Implications for Chromite and PGE Mineralization of the Hongshishan Alaskan-Type Complex in the Beishan Orogenic Collage, North West China

Frontiers in Earth Science, 2021
The Hongshishan mafic-ultramafic complex is situated in the north of the Beishan orogenic collage and the southern part of the Central Asian Orogenic Belt.
Zhaolin Wang, Zhaolin Wang, Xiaoming Zheng, Guixiang Meng, Guixiang Meng, Hejun Tang, Hejun Tang, Tonghui Fang   +7 more
doaj   +1 more source

Geochemical Consequences of Melt Percolation: The Upper Mantle as a Chromatographic Column [PDF]

, 1987
As magmas rise toward the surface, they traverse regions of the mantle and crust with which they are not in equilibrium; to the extent that time and the intimacy of their physical contact permit, the melts and country rocks will interact chemically. We
Navon, Oded, Stolper, Edward
core   +1 more source

Determination of Rare Earth Elements in Peridotite by Inductively Coupled Plasma-Mass Spectrometry after Alkali Fusion and Mg(OH)2 and Fe(OH)3 Coprecipitation

Yankuang ceshi, 2017
Characteristics of REEs in peridotite is significant for studying petrogenesis and magmatic processes. Due to the serious interference of matrix elements such as Mg and Fe, it is difficult to determine the low contents of REEs in peridotite (∑REEs=0.1-1 ...
LI Wei-liang, CHENG Xiu-hua, LI Zhong-yu, WANG Peng   +3 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

Trace element geochemistry of peridotites from the Izu-Bonin-Mariana Forearc, Leg 125

, 1992
Trace element analyses (first-series transition elements, Ti, Rb, Sr, Zr, Y, Nb, and REE) were carried out on whole rocks and minerals from 10 peridotite samples from both Conical Seamount in the Mariana forearc and Torishima Forearc Seamount in the Izu ...
Ingram, G., Johnson, K. T. M., Parkinson, I. J., Pearce, J. A., Thirlwall, M. F.   +4 more
core   +1 more source

Chromian spinel geochemistry as a petrogenetic indicator in the chromitites and peridotites of the Bajgan Complex, Western Makran [PDF]

پترولوژی
IntroductionEconomic chromite deposits are very common in ophiolite belts. These deposits usually occur in the uppermost horizons of the ophiolite mantle sequence or within the ultramafic cumulitic rocks at the base of the crustal sequence (González ...
Leila Vahedi, Morteza Delavari, Emilio Saccani   +2 more
doaj   +1 more source

Late Cretaceous Construction of the Mantle Lithosphere Beneath the Central California Coast Revealed by Crystal Knob Xenoliths

Geochemistry, Geophysics, Geosystems, 2018
The Pleistocene (1.65 Ma) Crystal Knob volcanic neck in the California Coast Ranges is an olivine‐plagioclase phyric basalt containing dunite and spinel peridotite xenoliths.
D. P. Quinn, J. B. Saleeby, M. N. Ducea, P. Luffi, P. D. Asimow   +4 more
doaj   +1 more source

Machine Learning Reveals Source Compositions of Intraplate Basaltic Rocks

Geochemistry, Geophysics, Geosystems, 2021
Recycling of crustal material is thought to introduce pyroxenite to the peridotite mantle. Mapping such lithological heterogeneity within the mantle is crucial to understanding the mantle's chemical evolution but remains challenging.
Peng Guo, Ting Yang, Wen‐Liang Xu, Bin Chen   +3 more
doaj   +1 more source

Titanium and water-rich metamorphic olivine in high-pressure serpentinites from the Voltri Massif (Ligurian Alps, Italy): evidence for deep subduction of high-field strength and fluid-mobile elements [PDF]

, 2014
Titanium- and water-rich metamorphic olivine (Fo 86-88) is reported from partially dehydrated serpentinites from the Voltri complex, Ligurian Alps. The rocks are composed of mostly antigorite and olivine in addition to magnetite, chlorite, clinopyroxene ...
De Hoog, Jan C. M., Hattori, Keiko, Jung, Haemyeong, 정해명   +3 more
core   +1 more source