Results 51 to 60 of about 446 (178)

TAS Diagram Plotter

, 2021
Excel spreadsheet that allows for fast plotting onto a TAS (total alkali silica) diagram for use in naming your volcanic rock by composition. Created using coordinates as given in Le Maitre et al (2002).
Iacovino, Kayla, Gouard, Cédric
core   +1 more source

Late Cretaceous-Early Paleogene volcanic rocks of Eastern Kamchatka (сomposition and isotopic-geochemical heterogeneity)

Вестник Камчатской региональной ассоциации "Учебно-научный центр". Серия: Науки о Земле
New and previously published isotope-geochemical material on the Upper Cretaceous-Lower Paleogene volcanic complexes of the Ozernovsky-Valaginsky segment of the Achaivayam-Valaginsky paleoarc are presented. It is found that composition of rocks composing
N.V. Tsukanov, P.I. Fedorov, D.V. Kovalenko   +2 more
doaj   +1 more source

Late Paleozoic Shoshonitic Magmatism in the Southwestern Middle Tianshan (Tajikistan) of the Southwestern Altaids: Implications for Slab Roll-Back With Extensional Arc-Related Basins After Flat Subduction

Frontiers in Earth Science, 2022
Paleozoic magmatic rocks are widespread in the western Middle Tianshan. Their petrogenesis can provide important insights into the geodynamic evolution of the southwestern Altaids.
Gufron Khalimov, Gufron Khalimov, Gufron Khalimov, Gufron Khalimov, He Yang, He Yang, He Yang, Miao Sang, Miao Sang, Wenjiao Xiao, Wenjiao Xiao, Wenjiao Xiao, Yunus Mamadjanov, Yunus Mamadjanov, Jovid Aminov, Dzhovid Yogibekov, Dzhovid Yogibekov, Dzhovid Yogibekov, Xijun Liu, Xijun Liu   +19 more
doaj   +1 more source

Metasomatism and Melting of Cordilleran Lithosphere Resulting From Sediment Relamination During Shallow Subduction

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract Mantle xenoliths recovered from the modern backarc region of the northern Altiplano Plateau record metasomatism by slab‐derived silicic melts, and a suite of Quaternary volcanics suggest that melting of accreted crustal material has persisted since shallow subduction in the Oligocene.
C. D. Hiett, D. L. Newell, J. W. Shervais   +2 more
wiley   +1 more source

Dating and source determination of volcanic rocks from Khunik area (South of Birjand, South Khorasan) using Rb-Sr and Sm-Nd isotopes [PDF]

پترولوژی, 2016
The Khunik area is located in the south of Birjand, Khorasan province, in the eastern margin of Lut block. Tertiary volcanic rocks have andesite to trachy-andesite composition.
Somayeh Samiee, Mohammad Hassan Karimpour, Majid Ghaderi, Mohammad Reza Hidarian Shahri, Jose Francisco Santos   +4 more
doaj  

Discovery of the Late Jurassic-Early Cretaceous Lamprophyres in Western Songliao Basin of Northeast China and Their Constraint on Regional Lithospheric Evolution

Frontiers in Earth Science, 2022
Contrary to the commonly accepted notion that the lithosphere in NE China thinned from the Late Jurassic through to the Early Cretaceous period, we report the discovery of a thickening episode in the backdrop of this long-term thinning.
Taiji Yu, Pujun Wang, Yan Zhang, Youfeng Gao, Youfeng Gao, Chongyang Chen   +5 more
doaj   +1 more source

Geochemistry and Geochronology of A‐Type Intermediate‐Felsic Rocks in NW Himalaya, Pakistan: Implications for Petrogenesis and Tectonic Evolution of Northern Gondwana

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 1, January 2025.
Abstract Igneous intrusives in northern Pakistan can provide valuable insights into pre‐Himalayan metaluminous to peraluminous magmatism along the northern boundary of the supercontinent Gondwana and its potential tectonic significance. This study generates new geochronologic, petrographic and geochemical data for intermediate (monzonite, syenite, and ...
Musa Khan, Huan Li, Thomas J. Algeo, Asad Khan, Michael W. Förster, Zaheen Ullah   +5 more
wiley   +1 more source

Sr isotope evidence for new magma inputs and short residence times in the XX century activity of Stomboli Volcano. [PDF]

, 1999
Stromboli is the type locality of continuous and moderately explosive volcanic activity. Monitoring temporal variations in the composition of the material erupted allows constraints to be made on the magma chamber dynamics and volcanic hazard.
Gareth R. Davies, Francalanci, Lorella, Francalanci, L., Davies, G.R.; id_orcid, Tommasini, Simone, Simone Tommasini, Tommasini, S., Conticelli, S., Davies, G.R., Lorella Francalanci, Conticelli, Sandro, Sandro Conticelli   +11 more
core   +1 more source

Middle to Late Ordovician flare‐up of granitoids, South Altyn Tagh: Reworking of exhumed continental crust

Geological Journal, Volume 59, Issue 8, Page 2190-2207, August 2024.
U–Pb ages, and O–Hf isotopic compositions of inherited and synmagmatic zircons are addressed to trace the source rocks and petrogenesis of a monzogranite pluton, which belong to the flare‐up of granitoids at 465–445 Ma in the South Altyn Tagh. The observations indicate that this monzogranite is mainly derived from reworking of exhumed continental crust,
Ningchao Zhou, Guochun Zhao, Jinlong Yao, Qian Liu, Yigui Han, Huishan Zhang, Guangli Ren   +6 more
wiley   +1 more source

Late Caenozoic Shoshonitic Lavas in North-western Viti Levu, Fiji [PDF]

Nature, 1968
MOST petrologists recognize two fundamental types of basaltic magma—tholeiite and alkaline olivine basalt1. The ratio of alkalis to silica is consistently higher in alkaline olivine basalts than in tholeiitic (sub-alkaline2) basalts3,4. Kuno5 recognized a third type of magma, high-alumina basalt characterized by high contents of alumina and ...
W. R. DICKINSON, M. J. RICKARD, F. I. COULSON, J. G. SMITH, R. L. LAWRENCE   +4 more
openaire   +1 more source