Results 21 to 30 of about 3,013 (217)

Relicts of Neo-Tethyan mantle wedge in the Indo-Burma Range, India: Record of carbonate metasomatism and Neo-Tethyan mantle evolution

Results in Earth Sciences, 2023
Several different geochemical signatures, i.e., mid-oceanic ridge (MOR) and supra subduction zone (SSZ), are frequently reported from ophiolite belts. Such bi-modal geochemical signatures are generally interpreted in terms of formation in two contrasting
Oinam Kingson, Yongsheng Liu, Rajneesh Bhutani, Mike Widdowson   +3 more
doaj   +1 more source

Multidisciplinary Modeling of Mantle Lithosphere Structure Within the Superior Craton, North America

Geochemistry, Geophysics, Geosystems, 2021
New 3D multi‐azimuthal receiver function analysis identified four regional seismic discontinuities dipping at 7–13° within the mantle of the Superior craton of North America; most are discordant to known major upper crustal structures.
David B. Snyder, Geneviève Savard, Bruce A. Kjarsgaard, Aeron Vaillancourt, Phillips C. Thurston, John A. Ayer, Eric Roots   +6 more
doaj   +1 more source

Insights into the Tethyan mantle heterogeneity: Trace element evidence from the Karakaya Complex, Central Anatolia

Geosystems and Geoenvironment, 2023
Highlights: • Strong Nb-kick originates from metasomatized oceanic lithospheric mantle (OLM). • Metasomatized OLM is a plume-related material causing Tethyan mantle heterogeneity.
Kaan Sayit
doaj   +1 more source

Post-collisional Tertiary–Quaternary mafic alkalic magmatism in the Carpathian–Pannonian region: a review [PDF]

, 2004
Mafic alkalic volcanism was widespread in the Carpathian–Pannonian region (CPR) between 11 and 0.2 Ma. It followed the Miocene continental collision of the Alcapa and Tisia blocks with the European plate, as subduction-related calc-alkaline magmatism was
Szakács, A., Seghedi, I., Downes, Hilary, Vaselli, O., Balogh, K., Pécskay, Z.   +5 more
core   +1 more source

Mantle xenoliths and host basalts record the Paleo-Asian oceanic materials in the mantle wedge beneath northwest North China Craton

Solid Earth Sciences, 2019
Oceanic subduction is an important trigger for mantle heterogeneity, which further increases melt production and controls the compositions of intraplate basalts. Such a role played by the (Paleo-) Pacific subduction have been extensively studied and well
Hong-Kun Dai, Jian-Ping Zheng
doaj   +1 more source

Magma Evolution and Mantle Metasomatism: Constraints on Olivine Composition in Potassic-Ultrapotassic Mafic Rocks from Lar Igneous Suite, SE of Iran [PDF]

Journal of Sciences, Islamic Republic of Iran, 2021
The Lar igneous suite (LIS), in southeastern Iran, is part of post collisional alkaline magmatism in Sistan suture zone. Shonkinite and kersantite are the only two high-Mg, K-rich olivine bearing rocks in the LIS. We study major and some compatible trace
Sasan Ghafaribijar, Mohsen Arvin, Sara Dargahi   +2 more
doaj   +1 more source

Long-term memory of subduction processes in the lithospheric mantle: evidence from the geochemistry of basic dykes in the Gardar Province of South Greenland [PDF]

, 2002
The rift-related magmas of the Proterozoic Gardar Igneous Province were emplaced across the contact between the South Greenland Archaean craton and the Palaeoproterozoic Ketilidian mobile belt.
R. M. Ellam, Goodenough, K.M., Ellam, R.M., K. M. Goodenough, Ellam, R, Upton, B.G.J., B. G. J. Upton   +6 more
core   +1 more source

Magnesium and Calcium Isotopic Geochemistry of Silica‐Undersaturated Alkaline Basalts: Applications for Tracing Recycled Carbon

Geochemistry, Geophysics, Geosystems, 2022
Carbon plays important roles in the evolution of the atmosphere and biosphere, and geochemical differentiation in Earth's interior. Most subducted C is recycled to the deep mantle and returns to the surface by degassing from erupted basalts and ...
Yue Qi, Qiang Wang, Gang‐Jian Wei, Jie Li, Derek A. Wyman   +4 more
doaj   +1 more source

LITHOSPHERIC MANTLE COMPOSITION AND STRUCTURE VARIATIONS UNDER THE SIBERIAN PLATFORM KIMBERLITE FIELDS OF DIFFERENT AGES

Геодинамика и тектонофизика, 2022
We discuss herein the differences both in composition and structure of the lithospheric mantle of the Siberian Platform under kimberlite fields of different ages.
N. P. Pokhilenko, V. P. Afanasiev, A. M. Agashev, L. N. Pokhilenko, N. S. Tychkov   +4 more
doaj   +1 more source

The lithosphere-asthenosphere boundary in the North-West Atlantic region [PDF]

, 2005
A detailed knowledge of the thickness of the lithosphere in the north Atlantic is an important parameter for understanding plate tectonics in that region.
Schweitzer, J., Reigber, C., Woelbern, I., Schwintzer, P., Wylegalla, K., Wolf, D., Larsen, T., Priestley, K., Fleming, K., Larsen, T. B., Kind, R., Hanka, W., Dahl-Jensen, T., Kumar, P., Yuan, X., Fleming, Kevin, Gudmundsson, O.   +16 more
core   +1 more source