Results 61 to 70 of about 48,430 (124)

PETROGENESIS AND ORIGIN OF THE CHENAR GRANITOID STOCK, NW OF KERMAN, IRAN: EVIDENCE OF NEOTETHYS SUBDUCTION RELATED ARC MAGMATISM [PDF]

Journal of Sciences, Islamic Republic of Iran, 2003
The lower to middle Miocene Chenar granitoid stock, a part of Central Iranian volcanic belt, is intruded into Eocene volcano-sedimentary complex in northwestern Kerman in south Central Iran.
M. Arvin
doaj  

The age of the Mont-Blanc granite (Western Alps) : a heterogeneous isotopic system dated by Rb-Sr whole rock determinations on its microgranular enclaves

, 1989
New Rb-Sr whole rock age data have been obtained for the Mont-Blanc calc-alkaline Hercynian granite. Different facies of the granite have been sampled, as well as locally abundant microgranular enclaves of magmatic origin.
Bussy, François, Schaltegger, Urs, Marro, Christian   +2 more
core   +1 more source

Mafic enclaves record syn-eruptive basalt intrusion and mixing [PDF]

, 2018
Mafic enclaves hosted by andesite erupted at the Soufrière Hills Volcano between 1995 and 2010 yield insights into syn-eruptive mafic underplating of an andesite magma reservoir, magma mixing and its role in sustaining eruptions that may be widely ...
Barclay, Jenni, Madeleine C.S. Humphreys, Thomas Christopher, Plail, Melissa, Melissa Plail, Edmonds, Marie, Andrew W. Woods, Woods, Andrew W., Christopher, Thomas, Marie Edmonds, Herd, Richard A., Woods, Andrew, Jenni Barclay, Richard A. Herd, Humphreys, Madeleine C.S., Humphreys, M.C.S, Woods, A. W, Christopher, T, Plail, M, Edmonds, M, Herd, R. A   +20 more
core   +2 more sources

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

Textural Relations of Lamprophyric Mafic Microgranular Enclaves and Petrological Implications for the Genesis of Potassic Syenitic Magmas: the example of Piquiri Syenite, southern Brazil [PDF]

, 2002
The Neoproterozoic Piquiri Syenite exhibits a large amount of mafic microgranular enclaves (MME) with elliptical-shape and millimeter to centimeter-size dimensions.
CID, JORGE PLÁ, NARDI, LAURO VALENTIM STOLL, GISBERT, PERE ENRIQUE   +2 more
core   +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

Petrogenesis of Bir Madi Gabbro-Diorite and Tonalite-Granodiorite Intrusions in Southeastern Desert, Egypt: Implications for Tectono-Magmatic Processes at the Neoproterozoic Shield [PDF]

International Journal of Economic and Environment Geology, 2010
The Neoproterozoic rocks of the Bir Madi area, south eastern desert, comprise a Metagabbro-Diorite Complex (GDC) and a Tonalite-Granodiorite Suite (TGrS).
M. A. OBEID
doaj  

The Ilha Anchieta Quartz Monzonite: the southernmost expression of ca. 500 Ma post-collisional magmatism in the Ribeira Belt

Anais da Academia Brasileira de Ciências, 2011
The Ilha Anchieta Quartz Monzonite (IAQM) occupies most of the homonymous island in the coast of the state of São Paulo, and is intrusive into foliated rocks of the ~565 Ma Ubatuba Charnockite.
José M. Azevedo Sobrinho, Valdecir A. Janas, Antonio Simonetti, Larry M. Heaman, Jair santoro, Hélio N. Diniz   +5 more
doaj   +1 more source

Plagioclase Zoning and Sr Isotopes Constrain Mush–Magma Mixing in the Late Triassic Xiuyan Granitic Pluton, East China

Geosciences
Mafic microgranular enclaves (MMEs) are widespread in granitic plutons and provide valuable insights into mush–magma mixing processes in crustal magma reservoirs.
Zisong Zhao, Shengwei Wu, Fucheng Yu, Shanping Li, Zhiyi Zhao   +4 more
doaj   +1 more source