Results 161 to 170 of about 859 (200)

Adakites and adakitic melts: Compositions of rocks, quenched glasses, and inclusions in minerals

Petrology, 2017
Data set of rocks and glasses whose compositions correspond to the term “adakite” (SiO2 > 56 wt %, Sr > 400 ppm, Sr/Y > 18) was compiled from two large geochemical data bases. It was revealed that the adakitic melts are characterized by extremely low abundance as compared to adakitic rocks.
M. L. Tolstykh, V. B. Naumov, V. V. Yarmolyuk   +2 more
openaire   +1 more source

A review of research on adakites

International Geology Review, 2019
Taking account of their importance in inferring continental geodynamic processes, adakites have been the subject of considerable research since their discovery and identification.
Lingyu Zhang, Shichao Li, Qingying Zhao
openaire   +1 more source

TTGs and Adakites: Are They Both Slab Melts?

Lithos, 2005
Abstract Although both high-Al TTG (tonalite–trondhjemite–granodiorite) and adakite show strongly fractionated REE and incompatible element patterns, TTGs have lower Sr, Mg, Ni, Cr, and Nb/Ta than most adakites. These compositional differences cannot be easily related by shallow fractional crystallization. While adakites are probably slab melts, TTGs
Kent C Condie
exaly   +2 more sources

Late Paleocene adakitic granitoid from NW Iran and comparison with adakites in the NE Turkey: Adakitic melt generation in normal continental crust

Lithos, 2019
Abstract Late Paleocene adakitic granitoids are rare in Iran except in the northwest. We focused on the adakitic Saqqez-Takab pluton, which occupies an area of ~600 km2. New U-Pb zircon dating yield crystallization ages of 58–56 Ma (Thanetian). These granitoids comprises granite, quartz monzonite and monzogranite with granular to mylonitic textures ...
Azizi, Hossein, Stern, Robert J., Topuz, Gültekin, Asahara, Yoshihiro, Moghadam, Hadi Shafaii   +4 more
openaire   +2 more sources

Discovery of Eocene adakites in Primor’e

Doklady Earth Sciences, 2011
This paper presents the first results of petrochemical and geochemical studies (by the ICP-MS technique) of adakites comprising a small extrusive body in the Ilistaya River basin (West Primor’e). Based on the data of radioisotopic dating (K-Ar method), the age of adakites corresponds to the Middle Eocene (45.52 ± 1.1 Ma).
A. A. Chashchin, V. P. Nechaev, E. V. Nechaeva, M. G. Blokhin   +3 more
openaire   +1 more source

Late Ordovician to Early Devonian Adakites and Nb-Enriched Basalts in the Liuyuan Area, Beishan, NW China: Implications for Early Paleozoic Slab-Melting and Crustal Growth in the Southern Altaids

Gondwana Research, 2012
We report newly-defined Nb-enriched basalts, adakites and dacites from the Beishan, NW China of the southern Altaids based on field, geochemical, isotopic and geochronology studies.
Chunming Han, Chao Yuan, Wenjiao Xiao
exaly   +2 more sources

Semi-adakitic magmatism of the Satkatbong diorite, South Korea: Geochemical implications for post-adakitic magmatism in southeastern Eurasia

Lithos, 2018
Abstract The Satkatbong diorite (190 Ma) and the older Yeongdeok granite (250 Ma) in the Yeongnam massif, which is part of the southeastern margin of the Eurasian plate, are affected by a subduction system that is associated with the Izanagi and Farallon plates.
Hoseong Lim, Hyeon Dong Woo, Bora Myeong, Jongkyu Park, Yun-Deuk Jang   +4 more
openaire   +1 more source

Underplating-related adakites in Xinjiang Tianshan, China

Lithos, 2008
Abstract Intermediate to acidic porphyries and dacites in the Awulale and Sanchakou area of the Xinjiang Tianshan region, China, conform to the definition of high-SiO2 adakite (HSA). These volcanic or subvolcanic rocks are characterized by high Na2O (Na2O > K2O), high Sr/Y (51–327), and strong depletions in HREE and HFSE (Nb, Ta, and Ti).
Z.H. Zhao, X.L. Xiong, Q. Wang, D.A. Wyman, Z.W Bao, Z.H. Bai, Y.L. Qiao   +6 more
openaire   +1 more source

Adakite-like and Normal Arc Magmas

2013
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-Krepoljin Zone (RKZ) of eastern Serbia.
Kolb, Melanie, von Quadt, Albrecht, Peytcheva, Irena, Heinrich, Christoph A., Fowler, Sarah J., Cvetković, Vladica   +5 more
openaire   +1 more source

Association of adakites with gold and copper mineralization in the Philippines

Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science, 1998
Adakites are intermediate or acidic volcanic and plutonic rocks which derive from partial melting of subducted oceanic crust when the subducting slab is young (< 20 Ma) and hot, and at the start and the end of subduction. In the Philippines, most of porphyry Cu and epithermal Au deposits are either spatially and temporally related or cogenetic with ...
Fernando G. Sajona, René C. Maury
openaire   +1 more source