Results 51 to 60 of about 52,304 (124)

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

Reworked restite enclave: Petrographic and mineralogical constraints from the Tongshanling intrusion, Nanling Range, South China

, 2018
International audienceMicrogranular enclaves, which can provide important petrogenetic indications for the host granitoids, are commonly observed in the Middle-Late Jurassic Cu-Pb-Zn-bearing granodiorites in the Nanling Range of South China.
Lu, Jian-Jun, Huang, Xu-Dong, Wu, Jin-Wei, Sizaret, Stanislas, Wang, Ru-Cheng, Ma, Dong-Sheng   +5 more
core   +1 more source

The Capability of Amphibole in Tracing the Physicochemical Processes of Magma Mixing

Geophysical Research Letters, Volume 51, Issue 14, 28 July 2024.
Abstract This study explores the capability of amphibole in tracing the physicochemical process of magma mixing through spatially associated gabbros, mafic microgranular enclaves (MMEs) and granodiorites from central Tibet. These rocks share similar zircon ages as well as zircon Hf‐O and plagioclase Sr isotopes.
Mingjian Li, Yunchuan Zeng, Massimo Tiepolo, Jifeng Xu, Enrico Cannaò, Francesca Forni, Feng Huang   +6 more
wiley   +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

Zircon U–Pb ages of granitic and mafic dikes associated with granitoids and metamorphic rocks of the Ryoke Belt in the eastern Kii Peninsula, southwest Japan

Island Arc, Volume 33, Issue 1, January/December 2024.
Abstract Zircon U–Pb dates for felsic and intermediate to mafic dikes intruding into the Ryoke granitoids and metamorphic rocks at selected outcrops in the Takamiyama area of the eastern Kii Peninsula, southwest Japan, were determined along with their geology and petrography to reveal the history of Cretaceous magmatism. At each outcrop, the felsic and
Kazunori Zushida, Makoto Takeuchi, Takashi Nakajima, Sae Taniguchi, Yuxiao Li, Yoshihiro Asahara, Koshi Yamamoto   +6 more
wiley   +1 more source

Geochemistry of Mafic Enclaves and Host Granitoids from the Chilliwack Batholith, Washington: Chemical Exchange Processes between Coexisting Mafic and Felsic Magmas and Implications for the Interpretation of Enclave Chemical Traits [PDF]

, 2004
Mafic enclaves from three plutons in the Chilliwack batholith have been compared with contemporaneous mafic stocks in order to determine (1) the processes by which mafic and felsic magmas hybridize in the plutonic environment and (2) whether analysis of ...
Kuehner, Scott M., Tepper, Jeffrey H.
core  

Sources of post-orogenic calcalkaline magmas : the Arrochar and Garabal Hill-Glen Fyne complexes, Scotland [PDF]

, 2009
The 425 Ma Arrochar and Garabal Hill–Glen Fyne complexes of highland Scotland are examples of post-orogenic magmatism accompanying extensional collapse of an orogen, in this case the Caledonian.
Darbyshire, D.P.F., J. Flinders, J.D. Clemens, D.P.F. Darbyshire, Flinders, J., Clemens, J.D.   +5 more
core   +1 more source

Igneous banding, schlieren and mafic enclaves in calc-alkaline granites : The Budduso pluton (Sardinia)

, 2008
International audienceThis study deals with the origin of igneous layering in plutons, and, especially, the extent layering is related to mafic–silicic magma interactions. The Budduso pluton (Sardinia) shows three main scales of organization.
Bourgeix, A.L, Barbey, P., Gasquet, Dominique, Pin, Christian   +3 more
core   +1 more source

Supplemental Material: Evidence for mixed contribution of mantle and lower and upper crust to the genesis of Jurassic I-type granites from Macao, SE China

, 2020
GSA Data Repository Item 2020193, GSA Bulletin. File size: about 3660 KB. Appendix 1: Location of analyzed samples; Appendix 2: (A) Electron microprobe standards and detection limits; (B) Detection limits of whole-rock elemental analyses; Appendix 3 ...
P. Quelhas (9011978), et al. (281964)
core   +1 more source