Results 91 to 100 of about 672 (207)

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  

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

, 2021
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.
Eklund, O., Andersson, U.B., Johansson, Å., Hölttä, P., Väisänen, M.   +4 more
core  

Evolution history of the crust underlying Cerro Pampa, Argentine Patagonia: Constraint from LA-ICPMS U-Pb ages for exotic zircons in the Mid-Miocene adakite [PDF]

, 2013
This paper newly reports results of LA-ICPMS U-Pb dating for 282 zircon crystals separated from a Middle Miocene adakite in Cerro Pampa, southern Argentine Patagonia. With the exception of one spot age, 174 of the U-Pb concordia ages are markedly older (>
Hirata, Daiji, Ramos, Victor Alberto, Orihashi, Yuji, Anma, Ryo, Iwano, Hideki, Sumino, Hirochika, Haller, Miguel Jorge F., Motoki, Akihisa   +7 more
core   +1 more source

Mid-Ordovician stratigraphy and volcanism in the Hølonda area, Scandinavian Caledonides: complex tectonomagmatic development following arc–continent collision near the Laurentian margin of Iapetus

, 2023
Figure S2.
Deta Gasser (4817910), Trond Slagstad (666151), Tor Grenne (2842421), Øyvind Skår (8760129), Fernando Corfu (2840879), Reidulv Bøe (4317967)   +5 more
core   +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

Geochemical, Sr-Nd-Pb, and Zircon Hf-O Isotopic Compositions of Eocene-Oligocene Shoshonitic and Potassic Adakite-like Felsic Intrusions in Western Yunnan, SW China: Petrogenesis and Tectonic Implications

, 2013
Coeval potassic adakite-like and shoshonitic felsic intrusions in the western Yunnan province of SW China are spatially and temporally associated with Eocene–Oligocene shoshonitic mafic volcanic rocks.
Lu, Yong-Jun, Li, Zheng-Xiang, McCuaig, T. Campbell, Hou, Zeng-Qian, Cliff, John, Hart, Craig J.R., Kerrich, Robert, Cawood, Peter A., Bagas, Leon, Belousova, Elena A., Tang, Suo-Han   +10 more
core   +1 more source

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

Adakite-high Nb basalt association, Kadavu-Hunter Ridge, SW PAcific: hot subduction and slab edge effects

, 2000
No description ...
Verbeeten, AC (15522902), Anthony Crawford (14734465)   +1 more
core  

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