Results 91 to 100 of about 859 (200)

Radiogenic and Stable Isotope Evidence for Recycling of Ancient Oceanic Crust in High‐Nb Basalts From Baja California, Mexico

Geophysical Research Letters, Volume 52, Issue 18, 28 September 2025.
Abstract The genesis of high‐Nb basalts (HNB) in subduction zones remains controversial, attributed to melting products of metasomatized mantle linked to recent or ancient subduction events. Here we present radiogenic isotope and molybdenum compositions for post‐subduction HNBs and adakites from Baja California, Mexico. The HNBs show more radiogenic Sr‐
Hai‐Quan Liu, Jie Li, Thierry Calmus, Alfredo Aguillón‐Robles, Le Zhang, Long Zhang, Xiao‐Long Huang, Yi‐Gang Xu   +7 more
wiley   +1 more source

Discovery of Late Permian Adakite in Eastern Central Asian Orogenic Belt: Implications for Tectonic Evolution of Paleo-Asian Ocean

The Permian to Triassic period represents a pivotal phase in the evolution of the Paleo-Asian Ocean, marked by significant tectonic transitions from subduction, collision, and post-orogenic extension.
Haihua Zhang, Liang Qiu, Jian Zhang, Yuejuan Zheng, Huiliang Dong, Yongfei Ma, Shuwang Chen, Yujin Zhang   +7 more
core   +1 more source

Early Miocene adakite-like volcanism in the Balkuyumcu region, central Anatolia, Turkey: Petrology and geochemistry

, 2007
International audienceThe Balkuyumcu region, located in the southwestern part of Ankara in the Izmir-Ankara suture zone (central Anatolia, Turkey), consists of basic andesitic, andesitic, dacitic and rhyolitic rocks extruded during the Early Miocene (20 ...
Varol, Elif, Temel, Abidin, Gourgaud, Alain, Bellon, Hervé   +3 more
core   +1 more source

Petrogenesis of low Silica Adakitic domes of Sahl (South of Shahrood, southeast of Semnan Province) [PDF]

پترولوژی, 2016
Sahl area, in the south of Shahrood, is a part of the northern portion of the Central Iran Structural Zone. The area is dominated by a thick sequence of the Paleocene to the middle Eocene volcanic and volcano-sedimentary rocks.
Fazilat Yousefi, Mahmoud Sadeghian, Zahra Jamali, Batoul Mansouri Moghadam, Habibollah Ghasemi   +4 more
doaj  

Adakite-like and Normal Arc Magmas: Distinct Fractionation Paths in the East Serbian Segment of the Balkan-Carpathian Arc [PDF]

, 2017
New age and whole-rock 87Sr/86Sr and 143Nd/144Nd isotopic data are used to assess petrogenetic and regional geodynamic processes associated with Late Cretaceous subvolcanic intrusions within the sparsely studied Timok Magmatic Complex (TMC) and Ridanj ...
Peytcheva, I., Heinrich, C. A., Von Quadt, A., Fowler, S. J., Cvetković, V., Kolb, M.   +5 more
core  

Do Cenozoic analogues support a plate tectonic origin for Earth's earliest continental crust?

, 2010
Archean continental crust largely comprises the trondhjemite, tonalite, and granodiorite/dacite (TTG/D) suite of igneous rocks. Formation of the earliest Archean (>3.5 Ga) TTG/Ds is controversial, being attributed to either subduction zone processes with
Kerr, A.C., Kerr, A. C., Millar, I.L., Pearce, J.A., Millar, I. L., Wolstencroft, M., Mitchell, S.F., McDonald, I., Hastie, Alan R., Kerr, Andrew C., Millar, Ian L., Mitchell, Simon F., Pearce, J. A., Pearce, Julian A., Wolstencroft, Martin, Mitchell, S. F., Hastie, A. R., Hastie, A.R., McDonald, Iain, Hastie, Alan, Kerr, Andrew Craig, Wolstencroft, Martin; id_orcid, Ian L. Millar, Simon F. Mitchell, Iain McDonald, Alan R. Hastie, Julian A. Pearce, Andrew C. Kerr, Martin Wolstencroft   +28 more
core   +2 more sources

Geochronology, geochemistry and petrogenesis of rhyodacite lavas in Eastern Jamaica : a new adakite subgroup analogous to early Archaean continental crust?

, 2010
Rhyodacite lavas (Newcastle Volcanic Formation) from the Wagwater Basin in eastern Jamaica dated at 52.74 ± 0.34 Ma (2σ) have adakitic-like major element compositions, low Y and heavy rare Earth element (REE) concentrations and negative Nb and Ta ...
Kerr, A.C., Kerr, Andrew C., Pearce, Julian A., Ian L. Millar, Mark, D.F., Barfod, D.N., Simon F. Mitchell, Dan Barfod, Barfod, D., Iain McDonald, Alan R. Hastie, Millar, I.L., Pearce, J.A., Mitchell, S.F., Darren F. Mark, McDonald, I., Hastie, Alan R., Millar, Ian L., Mitchell, Simon F., Mark, Darren F., Julian A. Pearce, Andrew C. Kerr, Hastie, A.R., Barfod, Dan, Kerr, Andrew Craig, Mark, D., McDonald, Iain   +26 more
core   +1 more source

Development of High-Silica Adakitic Intrusions in the Northern Appalachians of New Brunswick (Canada), and Their Correlation with Slab Break-Off: Insights into the Formation of Fertile Cu-Au-Mo Porphyry Systems

Geosciences
High-silica adakites exhibit specific compositions, as follows: SiO2 ≥ 56 wt.%, Al2O3 ≥ 15 wt.%, Y ≤ 18 ppm, Yb ≤ 1.9 ppm, K2O/Na2O ≥ 1, MgO < 3 wt.%, high Sr/Y (≥10), and La/Yb (>10).
Fazilat Yousefi, David R. Lentz, James A. Walker, Kathleen G. Thorne   +3 more
doaj   +1 more source

Palaeoproterozoic adakite- and TTG-like magmatism in the Svecofennian orogen, SW Finland

Geologica Acta, 2013
The Palaeoproterozoic Svecofennian orogen in the Fennoscandian shield is an arc accretionary orogen that was formed at c. 1.92-1.86Ga. Arc accretion, magmatism and the subsequent continent-continent collision thickened the crust up to c.
M. VÄISÄNEN, Å. JOHANSSON, U.B. ANDERSSON, O. EKLUND, P. HÖLTTÄ   +4 more
doaj  

Geochemical Constraints on Adakites of Different Origins and Copper Mineralization

The Journal of Geology, 2012
AbstractThe petrogenesis of adakites holds important clues to the formation of the continental crust and copper ± gold porphyry mineralization. However, it remains highly debated as to whether adakites form by slab melting, by partial melting of the lower continental crust, or by fractional crystallization of normal arc magmas.
Sun, Wei-Dong, Ling, Ming-Xing, Chung, Sun-Lin, Ding, Xing, Yang, Xiao-Yong, Liang, Hua-Ying, Fan, Wei-Ming, Goldfarb, Richard, Yin, Qing-Zhu   +8 more
openaire   +2 more sources