Results 161 to 170 of about 18,330 (214)

Comparison of Ultrafine Powder Pellet and Flux‐free Fusion Glass for Bulk Analysis of Granitoids by Laser Ablation‐Inductively Coupled Plasma‐Mass Spectrometry

Geostandards and Geoanalytical Research, 2018
Two sample preparation techniques (ultrafine powder pellet and flux‐free fusion glass) for LA‐ICP‐MS bulk analysis of granitoids were compared. Ultrafine powder particles produced by wet milling were characterised as d50: ~ 1.0 μm, d90: ~ 5.0 μm.
Shitou Wu, V. Karius, B. Schmidt, K. Simon, G. Wörner   +4 more
semanticscholar   +1 more source

Metamorphism of Granitoids

1994
Granitoid rocks comprise granites, alkali-feldspar granites, granodiorites and tonalites, and constitute a large portion of the continental crust. Because the main constituents — alkali-feldspar, plagioclase, quartz, biotite, muscovite, hornblende — are found over a wide range of P-T conditions, this rock group is not a very useful indicator of ...
Kurt Bucher, Martin Frey
openaire   +1 more source

Petrogenesis of Early Silurian granitoids in the Longshoushan area and their implications for the extensional environment of the North Qilian Orogenic Belt, China

Lithos, 2019
Analyses of the zircon U—Pb age, mineralogical chemistry and whole-rock geochemistry of the Jiling pluton along the southern margin of the Alxa Block were conducted.
Kai‐Xing Wang, Chi Yu, Jie Yan, Xiao-dong Liu, Wen‐Heng Liu, Jiayong Pan   +5 more
semanticscholar   +1 more source

Petrochemical characterization of Neoproterozoic Colomine granitoids, SE Cameroon: Implications for gold mineralization

Lithos, 2019
Biotite granites and K-feldspar granites are the dominant intrusive rock types of the Colomine gold district in the Neoproterozoic terrain of SE Cameroon.
R. Ngatcha, O. Okunlola, C. Suh, K. I. Ateh, A. Hofmann   +4 more
semanticscholar   +1 more source

Neoproterozoic granitoids on Wrangel Island

Doklady Earth Sciences, 2016
Based on geochronological U–Pb studies, the age of Wrangel Island granitoids was estimated as Neoproterozoic (Cryogenian). Some granitoids contain zircons with inherited cores with an estimated age of 1010, 1170, 1200, and >2600 Ma, assuming the presence of ancient (Neoarchean–Mesoproterozoic) rocks in the Wrangel Island foundation and their ...
M. V. Luchitskaya, S. A. Sergeev, S. D. Sokolov, M. I. Tuchkova   +3 more
openaire   +1 more source

High-temperature S-type granitoids (charnockites) in the Jining complex, North China Craton: Restite entrainment and hybridization with mafic magma

Lithos, 2018
The Liangcheng garnet granitoids are parautochthonous S-type granites that occur within granulite-facies metasediments in the ultrahigh-temperature (UHT) Jining Complex, eastern part of the Khondalite Belt, North China Craton.
Luo-Juan Wang, Jing-hui Guo, C. Yin, P. Peng, Jian Zhang, C. Spencer, J. Qian   +6 more
semanticscholar   +1 more source

Chlorites from Italian granitoid rocks

TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 1976
Chemical, X-ray, optical, thermal and microprobe analyses have been carried out on six chlorites from Italian granitoid rocks formed as a result of deuteric action on biotites.
Mirella Bondi, L. Morten, P. L. Rossi
openaire   +1 more source

Metamorphism of Granitoid Rocks

2002
Granitoid rocks comprise granite, alkali-feldspar granite, granodiorite and tonalite. They constitute the largest portion of the continental crust. Granitoid gneisses, commonly migmatites, are in fact the dominant rock type of the continents. Because the main constituents — alkali-feldspar, plagioclase, quartz, biotite, muscovite, hornblende — are ...
Kurt Bucher, Martin Frey
openaire   +1 more source

Geochronology and Geochemistry of Paleozoic to Mesozoic Granitoids in Western Inner Mongolia, China: Implications for the Tectonic Evolution of the Southern Central Asian Orogenic Belt

The Journal of geology, 2018
Situated between the South Tianshan suture zone to the west and the Solonker suture zone to the east, the Yagan and Zhusileng-Hangwula arcs (YZHAs) in western Inner Mongolia in China occupy a critical place to investigate the tectonic history of the ...
Qian Liu, Guochun Zhao, Yigui Han, Xu-Ping Li, Yanlin Zhu, P. Eizenhöfer, Xiaoran Zhang, Bo Wang, Regine Wingsum Tsui   +8 more
semanticscholar   +1 more source

Geochemistry of granitoid rocks and crustal evolution, Zhejiang Province, China— II. Proterozoic granitoid rocks

Chinese Journal of Geochemistry, 1998
Proterozoic granitoid rocks in Zhejiang Province were formed in the Shengongian period (1.8–1.9 Ga) and the Late Jinningian period (0.6–0.9 Ga), respectively. Petrogenetic problems are discussed based on chemical (major, trace elements and REEs) and Nd-Sr isotopic compositions.
Wang Yixian, Zhao Zhenhua, Bao Zhiwei, Li Xianhua   +3 more
openaire   +1 more source