Results 21 to 30 of about 114 (105)

Origin of the Azubai Be-mineralized pegmatites, Xinjiang Altay: constraints from Li–Hf isotopes

Open Geosciences
The genetic mechanism of rare-metal pegmatites – whether they form primarily by extreme fractionation of granitic magmas or direct crustal anatexis – remains highly controversial.
Ma Zhanlong, Hai Lianfu, Zhao Shaoqing
doaj   +1 more source

Triassic Retrograde Metamorphism and Anatexis in the Sulu Orogenic Zone, Central China: Constraints from U–Pb Ages, Trace Elements, and Hf Isotopic Compositions of Zircon

Applied Sciences
We report information on the protolith, the Triassic retrograde metamorphism, and anatexis recorded in zircons extracted from granitic gneiss and biotite schist in the Sulu orogenic zone, central China.
Yongkang Ye, Hengcong Lei, Fei Xia, Hui Zhang, Congjun Yu   +4 more
doaj   +1 more source

H2O-fluxed remelting of arc roots drives continent maturation and the Daly Gap

Nature Communications
Granitic plutons are key components of the continental crust, resulting from the interplay between fractional crystallization (FC) of mantle melts and crustal anatexis.
Pengsheng Dong, Roberto F. Weinberg, Di-Cheng Zhu, Qing Wang, Guillermo Ortiz Joya, Oliver Nebel   +5 more
doaj   +1 more source

Generation of metal-rich felsic magmas during crustal anatexis

Geology, 2003
We show that partial melting of a preexisting mineral deposit during regional anatexis is likely to lead to incorporation of sulfide melt into silicate melt. Simple dissolution of metals in silicate melt during anatexis leads to minor metal addition to escaping magma, but physical entrainment of sulfide melt can lead to extreme enrichment and higher ...
Tomkins, Andrew, Mavrogenes, John
openaire   +2 more sources

Evolution of the melt source during protracted crustal anatexis: An example from the Bhutan Himalaya [PDF]

Geology, 2019
Abstract The chemical compositions of magmatic zircon growth zones provide powerful insight into evolving magma compositions due to their ability to record both time and the local chemical environment. In situ U-Pb and Hf isotope analyses of zircon rims from Oligocene–Miocene leucogranites of the Bhutan Himalaya reveal, for the first ...
Warren, Clare, Spencer, Christopher, Hopkinson, Thomas, Roberts, Nick, Parrish, Randall, Harris, Nigel, Hammond, Sam   +6 more
openaire   +5 more sources

Xenolith Zircons Record the Long Geological History of India‐Asia Convergence: Results From U‐Pb Depth Profiling

Geophysical Research Letters
Continental crust forms in magmatic arcs and transforms through collision, as seen in the Tibetan crust shaped by Neo‐Tethyan subduction and India‐Asia collision.
Wen‐Rui Sun, Roberto Weinberg, Rui Wang, Li Liu, Liang‐Liang Zhang   +4 more
doaj   +1 more source

Neoproterozoic magmatic evolution of the southern Ouaddaï Massif (Chad)

BSGF - Earth Sciences Bulletin, 2020
This paper presents new petrological, geochemical, isotopic (Nd) and geochronological data on magmatic rocks from the poorly known southern Ouaddaï massif, located at the southern edge of the so-called Saharan metacraton. This area is made of greenschist
Djerossem Félix, Berger Julien, Vanderhaeghe Olivier, Isseini Moussa, Ganne Jérôme, Zeh Armin   +5 more
doaj   +1 more source

Cordierite as a sensor of fluid conditions in high‐grade metamorphism and crustal anatexis [PDF]

Journal of Metamorphic Geology, 2002
AbstractCordierite H2O and CO2 volatile saturation surfaces derived from recent experimental studies are presented for P–T conditions relevant to high‐grade metamorphism and used to evaluate fluid conditions attending partial melting and granulite formation.
S. L. Harley, P. Thompson, B. J. Hensen, I. S. Buick   +3 more
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Crustal anatexis and ductile superimposition in the Culai Mountain region, western Shandong Province: Constraints on the Neoarchean tectonic framework of the eastern North China Craton

Dizhi lixue xuebao
Objective  Western Shandong is located in the core area of the eastern North China Craton and represents a typical Archean basement exposure. It extends as an overall NW–SE trending linear belt.
TANG Qiaoting, ZHANG Jian, ZHANG Shuhui, YIN Changqing, WU Qihang, ZHAO Chen, HE Mingtao, HUANG Wei   +7 more
doaj   +1 more source

Tectonic significance of Late Precambrian calc-alkaline and alkaline magmatism in Saint Katherina Area, Southern Sinai, Egypt

Geologica Acta, 2007
Two magmatic rock suites are distinguished in the Late Precambrian basement of the Southern Sinai (NW Arabian-Nubian Shield, Egypt), namely (a) a calc-alkaline suite, and (b) an alkaline suite.
M.K. Azer
doaj   +1 more source