Results 71 to 80 of about 858 (191)

Heavy boron isotopes in plume-derived magmas trace recycled water in deep-mantle reservoir

Communications Earth & Environment
The debate on the origin of water in the Earth’s interior focuses on whether it originates from internal primordial sources or externally from the Earth’s surface via subduction-related processes. Here we report boron isotope data for Middle/Late Permian
Jian Xu, Xiao-Ping Xia, Omar Bartoli, Le Zhang, Yong Wang, Jin-Long Ma, Ze-Xian Cui, Yan-Qiang Zhang, Qing Yang, Qiang Wang, Yi-Gang Xu   +10 more
doaj   +1 more source

PALEOZOIC INTRAPLATE MAGMATISM OF THE EAST EUROPEAN PLATFORM: COMPARATIVE ANALYSIS OF THE PRIPYAT-DNIEPER-DONETS RIFT ZONE AND THE KOLA-ARKHANGELSK PROVINCE

Геодинамика и тектонофизика
This paper presents a comparative analysis of geochronological, geochemical, Sr-Nd isotopic data and geodynamic conditions for the Devonian magmatism of the East European Platform, using as an example the Pripyat-Dnieper-Donets rift zone in the south of ...
E. V. Yutkina, A. V. Kargin, A. A. Nosova, O. F. Kuzmenkova, L. V. Sazonova, I. A. Kondrashov   +5 more
doaj   +1 more source

Helium Isotope Variations in Gulf of Aden Basalts and the Surface Expression of Mantle Heterogeneity During Afar Plume—Triple Junction Interaction

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract New helium isotope data for basalt glasses from the Gulf of Tadjoura and Gulf of Aden reveal a mantle plume signal that has 3He/4He up to 17 RA. In the Gulf of Aden, plume helium is detectable ∼380 km from the Afar triple junction, up to the Shukra El Sheik Fracture Zone along the West Sheba Ridge, but not beyond.
D. W. Graham, P. J. Michael
wiley   +1 more source

Using Digital Soil Mapping to Create Spatial Off‐Road Driving Guidelines and Optimal Road Networks in the Phinda Reserve

European Journal of Soil Science, Volume 76, Issue 5, September–October 2025.
ABSTRACT Protected areas are often thought of as pristine natural environments. Practically however, protected areas are often degraded. In Africa, protected areas are mostly funded through game viewing tourism, where development of the road network to enable game viewing often leads to land degradation.
G. M. van Zijl, G. P. Nortjé, P. J. Fourie   +2 more
wiley   +1 more source

Ultra‐Mafic Cumulates From Kaupulehu, Hualālai Volcano, Hawai'i: Geochemical Resetting of Mantle‐Inherited Olivine

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract We characterized the chemical composition and microstructure of six ultramafic cumulates from the Kaupulehu lava flow, Hualālai (Hawai'i Island), to decipher their origin. The samples are mostly wehrlites with poikilitic textures. The chemical compositions obtained from electron probe microanalyses and laser ablation inductively coupled plasma
A. D. Dujardin, S. Demouchy, O. Alard, E. Gardés, M. Laubier, F. Barou   +5 more
wiley   +1 more source

The Palaeoproterozoic Komatiite-Picrite Association of Finnish Lapland [PDF]

Journal of Petrology, 2001
The large range of chemical variation within intimately associated highly magnesian volcanic rocks in the Palaeoproterozoic Central Lapland Greenstone Belt prompted the construction of a new classification scheme for MgO-rich volcanic rocks, based on an [Al 2 O 3 ] vs [TiO 2 ] diagram where the axes are the Al 2 O 3 and TiO 2 contents (in ...
openaire   +1 more source

Mantle source for the Emeishan large igneous province is oxidized

Table S1. The major (wt.%) and trace (ppm) element compositions of olivine from the Emeishan Picrites and basalts. Table S2. The major (wt.%) and trace (ppm) compositions of the Emeishan picrites and basalts Table S3.
Bai, Zhong-Jie
core   +1 more source

Helium isotopes in early Iceland plume picrites: constraints on the composition of high ³He/⁴He mantle

, 2009
A detailed study of the geochemistry of a new suite of early Iceland plume picrites shows that extremely high ³He/⁴He ratios (up to 50 <i>R</i>_a) are found in picrites from ...
Larsen, L.M., Ellam, R.M., Ellam, Robert M., Stuart, F.M., Fitton, J.G., Starkey, Natalie A., Basu, Sudeshna, Fitton, J. Godfrey, Starkey, N.A., Larsen, Lotte M., Basu, S., Stuart, Finlay M.   +11 more
core   +1 more source

Late Permian–Early Triassic Kamensky dyke belt, NW margin of Siberian platform: Two stages of the Siberian superplume event

Geosystems and Geoenvironment
A large (900 km long by 50-60 km wide) Early Triassic dyke swarm intruded along the northern margin of the Siberian platform in the Yenisei-Khatanga trough, crossing the Noril’sk, Kamensky and Maimecha-Kotui provinces.
V.V. Ryabov, I.V. Ashchepkov, A.V. Travin, V.A. Ponomarchuk, N.S. Karmanov, N.M.W. Roberts   +5 more
doaj   +1 more source

Petrocrafical and mineralogical features of ultramafits from Kirelsk fragment of Kansk greenstone belt (NW of the East Sayan)

Известия Томского политехнического университета: Инжиниринг георесурсов, 2017
Ultramfits of the studied territory are perspective on detection of Cu-Ni with platinum-group elements deposits that causes the relevance of their research. The main aim of the study.
Aleksey Ivanovich Chernyshov, Nikita Anatolievich Babintsev, Valery Gavrilovich Voroshilov   +2 more
doaj   +2 more sources