Results 51 to 60 of about 45,840 (156)

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

Autoliths: Reinterpreting Mafic Microgranular Enclaves in Granites and their Implications [PDF]

Goldschmidt Abstracts, 2020
Rodríguez, Carmen, Castro Dorado, Antonio   +1 more
openaire   +2 more sources

Sr and Nd isotopic investigations towards the origin of feldspar megacrysts in microgranular enclaves in two I-type plutons of the Lachlan Fold Belt, southeast Australia

, 2000
New Sr and Na isotopic cata are presented for several large feldspar crystals occurring in microgranular enclaves in the Swifts Creek and Bricle Track biutons, along with analyses of their host enclave grounamass and adjacent granitoid.
Maas, R., Dean, A. A., Nicholls, I. A., Waight, T. E.   +3 more
core   +1 more source

Petrogenesis and tectonic implications of Early Paleozoic granitoids in the Baoshan deposit, Guangxi, South China

Frontiers in Earth Science
The Early Paleozoic tectonic setting and geological processes of the South China Block have long been a subject of debate. This study presented zircon U-Pb geochronology and Hf isotope, and whole-rock geochemical analyses for the Early Paleozoic ...
Puliang Lyu, Fang Liu, Ling Chen, Zhiguang Song, Wenen Ma, Yanlin Hou, Yanlin Hou   +6 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

Cogenetic origin of mafic microgranular enclaves in calc-alkaline granitoids: The Permian plutons in the northern North China Block [PDF]

Geosphere, 2017
Mafic microgranular (microgranitoid) enclaves (MMEs) with fine-to medium-grain–size igneous microstructures are abundant in Permian granitoid plutons in the northern North China Block (NCB). They are mainly dioritic in composition with SiO 2 contents from 51.0 wt% to 62.7 wt% and are contiguous with their host granitoids (SiO 2 = 60.4–68.4 wt ...
Shuan-Hong Zhang, Yue Zhao
openaire   +1 more source

Petrogenesis of Early Cretaceous granitoids and mafic microgranular enclaves from the giant Tonglushan Cu-Au-Fe skarn orefield, Eastern China

, 2021
Late Mesozoic high-K talc-alkaline and high Sr/Y granitoids related to the skam-porphyry-stratabound Cu-Au polymetallic deposits are widespread in the Middle-Lower Yangtze River Belt (MLYRB), Eastern China.
Ma, Qiang, Chu, Gaobin, Cheng, Jiamin, Long, Xiaoping, Tian, Jing, Zhang, Shitao, Chen, Huayong, Zhang, Weifeng   +7 more
core   +1 more source

A Complex Interplay Between Pluton Emplacement, Tectonic Deformation, and Plate Kinematics in the Cretaceous Sierra Nevada Magmatic Arc, California

Tectonics, Volume 43, Issue 3, March 2024.
Abstract The relation of plate kinematics to the structural record of arc plutons and their host rocks is complex and still not fully understood. We address this issue through a combination of field mapping, structural analysis, anisotropy of magnetic susceptibility analysis, and fabric modeling in the Late Cretaceous Tuolumne Intrusive Complex, Sierra
Filip Tomek, Jiří Žák, Kryštof Verner, Josef Ježek, Scott R. Paterson   +4 more
wiley   +1 more source

Apatite Textures, Elemental and Isotopic Compositions Unmask the Homogenizing Process in Silicic Magma Chambers

Geophysical Research Letters, Volume 51, Issue 2, 28 January 2024.
Abstract Silicic magmas are the most viscous of all magmas, however some granitic plutons display remarkably homogeneous compositions, which contradicts the hypothesis that mechanical mixing is the main homogenizing process in the magma chamber. Thus much remains controversial about the mechanisms responsible for the homogeneities of silicic plutons ...
Jian Xu, Xiao‐Ping Xia, Qiang Wang, Christopher J. Spencer, Le Zhang, Xin Zhu   +5 more
wiley   +1 more source

Geochemistry of microgranular enclaves and host granodiorite from Oledo, Central Portugal [PDF]

, 2007
Geochemistry of microgranular enclaves and host granodiorite from Oledo, Central ...
Silva, M.M.V.G., Neiva, A.M.R., Antunes, I.M.H.R.   +2 more
core   +2 more sources