Results 91 to 100 of about 806 (206)

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  

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

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

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

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-like signature in volcanic rocks associated with the Oro del sur Au - (Cu) epithermal deposit, Southern Precordillera, Argentina [PDF]

, 2011
The Oro del Sur deposit is located in the southern part of the Precordillera of Mendoza Province, Argentina (32°30'S, 69°05'W) within the flat-slab subduction segment.
Carrasquero, Silvia Irene, Rubinstein, Nora Alicia, Fontignie, Denis, Nora Alicia Rubinstein, Silvia Irene Carrasquero, Denis Fontignie   +5 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

Adakite-like volcanism of Ecuador: lower crust magmatic evolution and recycling

, 2009
In the Northern Andes of Ecuador, a broad Quaternary volcanic arc with significant across-arc geo- chemical changes sits upon continental crust consisting of accreted oceanic and continental terranes. Quaternary volcanic centers occur, from west to east,
Othmar Müntener, Beate, B., Massimo Chiaradia, Fontignie, D., Fontignie, Denis André, Bernardo Beate, Denis Fontignie, Muntener, O., Beate, Bernardo, Chiaradia, Massimo, Chiaradia, M., Muntener, Othmar   +11 more
core   +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  

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