Results 41 to 50 of about 114 (105)

LITHIUM ISOTOPIC CONSTRAINTS ON THE ORIGIN OF I- AND A-TYPE GRANITES FROM EAST JUNGGAR (NW CHINA) OF THE CENTRAL ASIAN OROGENIC BELT: IMPLICATIONS FOR LI ISOTOPIC FRACTIONATION DURING CRUSTAL ANATEXIS

Геодинамика и тектонофизика, 2017
Though Li isotope fractionation during mantle melting and differentiation of basaltic melts have been proved insignificant, Li isotopic systems during crustal processes remain unclear. To study this, we report combined petrological, Nd-Sr and Li isotopic
Bin Chen, Keke Sun, Chao Huang, Hai-ou Gu   +3 more
doaj   +1 more source

Isotopic Disequilibrium Between Migmatites and Protolith: Insights from a Variscan Anatectic Complex (NW of Iberian Variscan Belt, Portugal)

Geosciences
Isotopic disequilibrium during the formation of high-temperature (HT) metamorphic complexes by anatexis during continental collision is a process that deserves intense discussion since it is fundamental to understand the evolution of continental crust ...
Joana Alexandra Ferreira, Helena C. B. Martins, Maria dos Anjos Ribeiro, José Francisco dos Santos   +3 more
doaj   +1 more source

Apatite Geochemical Perspectives on the Maturation of Continental Arc Crust via Mush‐Facilitated Processes During Magmatic Flare‐Up

Geochemistry, Geophysics, Geosystems
In volcanic arcs, magma evolves from basaltic to intermediate and felsic composition, resulting in arc crust maturation. It remains unclear whether processes involving mush during magmatic flare‐ups would enhance this evolution.
Long Chen, Peng Gao, Ian Somerville, San‐Zhong Li, Jiang‐Hong Deng, Dong‐Yong Li, Sheng‐Yao Yu, Xiao‐Hui Li, Hua‐Hua Cao, Zi‐Fu Zhao, Zhi‐Feng Yin   +10 more
doaj   +1 more source

Cenozoic magmatism petrogenesis and evolution in the Sangan mining district: using zircon mineral chemistry [PDF]

پترولوژی
Zircon is a significant mineral due to its ubiquitous occurrence, chemically resistant and refractory, that can survive both weathering and transport processes as well as high-temperature metamorphism and anatexis (Ballard et al., 2002).
Majid Ghasemi Siani, Behzad Mehrabi, Franz Neubauer   +2 more
doaj   +1 more source

Petrogenetic evolution of I-type granitoids in the Gouna region, Northern Cameroon: Geochemical evidence for subduction-related to post-collisional magmatism during the Pan-African orogeny

Geosystems and Geoenvironment
The Gouna region, located in the northern part of the Pan-African belt in Cameroon, comprises a diverse suite of granitoids, including amphibole granites, amphibole–biotite granites, biotite granites, biotite–muscovite granites, and muscovite-bearing ...
Mahamat Abakar, Jacques Wassouo Wadjou, Amadou Diguim Kepnamou, Yaya Fodoué, Jean Marcel Abate Essi, Nguihdama Dagwai, Ngounouno Isamaila   +6 more
doaj   +1 more source

Strain Localization and Seismic Properties in the Heterogeneous Ailaoshan‐Red River Shear Zone, Southeast Asia

Geochemistry, Geophysics, Geosystems
Strain localization is crucial in developing crustal‐scale shear zones; however, a systematic analysis of deformation characteristics and their impact on seismic properties is still lacking.
Junyu Li, Shuyun Cao
doaj   +1 more source

Rare-metal mineralization and crust-derived magmatism in a collisional orogen: the Variscan metallogenic odyssey of the Sioule region (French Massif Central)

BSGF - Earth Sciences Bulletin
The Sioule region in the northern part of the French Massif Central of the Variscan belt hosts the Echassières complex, where a large W(-Sn) quartz vein system was intruded by the Beauvoir rare-metal granite (RMG) hosting disseminated Sn, Nb-Ta and Li ...
Ballouard Christophe, Carr Patrick A., Monnier Loïs, Fidalgo Jean-Charles, Rocher Océane, Esteves Nicolas, Laurent Oscar, Daoulas-Gérardin Marie, Peiffert Chantal, Declercq Lou, Mercadier Julien, Plunder Alexis, Melleton Jérémie   +12 more
doaj   +1 more source

Petrographic and Geochemical Analyses of Kirana Hills Shield Rocks around Sargodha and Economic Potential [PDF]

International Journal of Economic and Environment Geology, 2017
The present study deals with geochemical and petrographic analysis of the Kirana Hill shield rocks of Punjab plains from Buland, Hachi, Shaheen Abad, Shaikh and Machh hills.
Muhammad Waseem Khan, Syed Abbas Sultan, Iftikhar Alam, Muhammad Saqib Izhar   +3 more
doaj  

Zircon and allanite U-Pb ID-TIMS ages of vaugnerites from the Calzadilla pluton, Salamanca (Spain): dating mantle-derived magmatism and post-magmatic subsolidus overprint

Geologica Acta, 2017
Basic to intermediate high-K, high-Mg mantle-derived rocks occur throughout the Iberian Massif and are particularly important in the Tormes Dome, where vaugnerites form several stocks and small plutons. One of the largest and geochemically most variable
F.J. LÓPEZ-MORO, R.L. ROMER, M. LÓPEZ-PLAZA, M. GÓNZALEZ SÁNCHEZ   +3 more
doaj  

Crustal Anatexis Forms Continental Crust in the Izu Rear-Arc [PDF]

Goldschmidt Abstracts, 2020
Haochen Duan, Abigail K Barker, Heejin Jeon, Martin J. Whitehouse, Chao Zhang   +4 more
openaire   +1 more source