Results 51 to 60 of about 672 (207)

Poikilitic hornblende pyroxenite in the southern end of the Abukuma Mountains, Northeast Japan, as result of adakitic magmatism

Frontiers in Geochemistry
Amphibole plays a pivotal role in mediating the flux of volatiles and partial melting that ultimately contribute to arc magmatism. The influence of amphibole from the lower crust to the upper mantle remains unclear due to limited opportunities for ...
Akira Wakazono, Mayuko Fukuyama, Keita Itano, Yumiko Harigane, Akihiro Tamura, Tomoaki Morishita, Tomoaki Morishita   +6 more
doaj   +1 more source

Paleogene adakitic rhyolite to high-Mg andesites and Early Cretaceous adakitic zoned plutons in the Kitakami Mountains, Japan

The Journal of the Geological Society of Japan, 2008
花崗岩質大陸地殻の形成機構を明らかにすることは，地球の進化過程の解明に通じる重要な研究課題である．本案内書では，北上山地の前期白亜紀アダカイト質累帯深成岩体と古第三紀浄土ヶ浜流紋岩類の主要な岩体について，岩石学的特徴とその成因について述べた．これらのアダカイト類の岩石化学的多様性の成因には，スラブメルトとマントルおよび下部地殻との反応の程度の差が主要な役割を果たしていたと考えられ，スラブメルトの発生から上昇・定置に至る現象の解明に重要な位置を占めると考えられる．
Nobutaka Tsuchiya, Yoshiharu Nishioka, Shuhei Koiwa, Naoko Otsuki   +3 more
openaire   +2 more sources

Slab Gap‐Related Intraplate Magmatism as a Proxy of Maximum Flat Slab Extent in Patagonia

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Establishing the frontal extent of ancient flat subduction events from the geologic record can be challenging. This difficulty arises because magmatic activity in the arc typically ceases during complete slab flattening, and other meaningful proxies are usually absent. To address this issue, we examine early Paleocene intraplate magmatic units
C. R. Navarrete, G. M. Gianni, G. I. Massaferro, M. B. Lastra   +3 more
wiley   +1 more source

Provenance Reassessment of Eocene Turbidites, New Caledonia: Inferences for Obduction Models

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract Provenance of pre‐obduction Eocene turbidites from New Caledonia is used to better constrain their geodynamic context and inform debate on subduction polarity. Chemical compositions of detrital clinopyroxenes in arenites are compared against potential sources.
Dominique Cluzel, France Pattier, Renjie Zhou, Sébastien Meffre, Jonathan C. Aitchison, Pierre Maurizot, Maximilien Mathian, Jean‐Luc Devidal   +7 more
wiley   +1 more source

Rapakivi K‐Feldspar Megacrysts in Monzogranitic Porphyry: Evidence for Magma Recharge and Mush Rejuvenation

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract The formation, storage, and evolution of granitic magmas are fundamental processes driving the growth of continental crust. While traditionally attributed to crystal fractionation in high‐melt fraction magma chambers, the model invoking low‐melt fraction crystal mushes has gained wide acceptance.
Wang Li, Xuxuan Ma, Roberto Weinberg, Liang Qiu, Zhiyong Zhu, Haibing Li   +5 more
wiley   +1 more source

Tracing arclogites in the Paleoproterozoic Era - A shift from 1.88 Ga calc-alkaline to 1.86 Ga high-Nb and adakite-like magmatism in central Fennoscandian Shield [PDF]

, 2022
Arclogites, i.e., lower crustal gamet-pyroxenite cumulates, are suggested to play an important role in controlling magma differentiation in modem continental arcs.
Kara Jaakko, Huhma Hannu, O'Brien Hugh, Väisänen Markku, Lahaye Yann, Heinonen Jussi S.   +5 more
core   +1 more source

Is there a Grenvillian basement in the Guerrero-Morelos Platform of Mexico?

Geologica Acta, 2007
In the Guerrero-Morelos platform (Guerrero State, Mexico) the adakitic rocks of Early Tertiary age contain abundant hornblende-rich tonalite xenoliths. Zircon crystals have been concentrated from both adakites and xenoliths, and dated using in-situ U-Pb ...
G. Levresse, J. Tritlla, E. Deloule, P. J. PINTO LINARES   +3 more
doaj   +1 more source

Zircon U-Pb ages and geochemistry of Early Cretaceous volcanic rocks, northwestern Korean Peninsula: Constraints on Late Early Cretaceous continental arc distribution in Northeast Asia

Journal of Asian Earth Sciences: X, 2022
In the northwestern Korean Peninsula, Cretaceous volcanic rocks are composed of andesite, andesite-dacite and rhyolite intercalated with terrigenous clastic rocks.
Jonghyok Yang, Hyonchol Ku, Ung Pak, Chungil Ri, Myongchol Kim, Cholsu Jong, Hyonuk Pak, Jongnam Kim, Songhyok Ju, Cholhyon Kim, Jusong Yun, Sunghyon Kim   +11 more
doaj   +1 more source

Unveiling Cenozoic Volcanism in the Takab‐Shahindezh Area Induced by Slab‐Mantle Interaction in the Zagros Orogen, NW Iran

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract The Zagros orogen records the closure of the Neotethys Ocean by northward subduction of the oceanic slab beneath the Iranian plate. Northwestern Iran has undergone episodic volcanism since the Eocene, due to a shift of tectonic regimes from subduction to collision and post‐collisional extension, although the dynamics responsible for such ...
Farzaneh Shakerardakani, Wenjiao Xiao, Franz Neubauer, Xian‐Hua Li, Behzad Monfaredi, Miao Sang   +5 more
wiley   +1 more source

Petrochemical characteristics of late Paleozoic magmatic rocks of the Mandakh area, southeast Mongolia

Mongolian Geoscientist, 2018
The late Paleozoic magmatic rocks are widely distributed in the Mandakh area which is located in the Gurvansaikhan and Manlai terrains, where porphyry Cu deposits occur.
Undarmaa Batsaikhan, Tsuchiya Noriyoshi, Chimedtseren Anaad, Batkhishig Bayaraa   +3 more
doaj   +1 more source