scholarly journals Geochemistry and tectonic setting of plutonic rocks in Kalasur (west Kaleybar-NW Iran)

2021 ◽  
Vol 12 (2) ◽  
pp. 124-139
Author(s):  
Hamideh Javadi Tazekand ◽  
Mohsen Moayyed ◽  
Ahmad Jahangiri ◽  
Mohammad Reza Hossinzadeh ◽  
Amir Rahmani
Keyword(s):  
Tectonic Setting ◽  
Nw Iran ◽  
Plutonic Rocks

scholarly journals Character and tectonic setting of plutonic rocks in the Gällivare area, northern Norrbotten, Sweden

GFF ◽  
2018 ◽  
Vol 141 (1) ◽  
pp. 1-20
Author(s):  
Zmar Sarlus ◽  
Olof Martinsson ◽  
Tobias E. Bauer ◽  
Christina Wanhainen ◽  
Joel B. H. Andersson ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Plutonic Rocks

Paleostress analysis of a gigantic gravitational mass movement in active tectonic setting: The Qoshadagh slope failure, Ahar, NW Iran

2013 ◽  
Vol 605 ◽  
pp. 70-87 ◽  
Author(s):  
I. Baroň ◽  
M. Kernstocková ◽  
M. Faridi ◽  
M. Bubík ◽  
R. Milovský ◽  
...  
Keyword(s):  
Slope Failure ◽  
Tectonic Setting ◽  
Mass Movement ◽  
Gravitational Mass ◽  
Nw Iran ◽  
Active Tectonic ◽  
Paleostress Analysis

Eocene Arc-related Magmatism within the Neotethys Subduction System in NW Iran; Geochemistry and SHRIMP zircon U-Pb Dating on Magmatic Phases in the Shahjahan Batholith

2021 ◽  
Author(s):  
Zahra Ahmadi ◽  
Ahmad Jahangiri ◽  
Mohssen Moazzen ◽  
Chang Whan oh
Keyword(s):  
Tectonic Setting ◽  
Crustal Thickening ◽  
Spinel Lherzolite ◽  
Calc Alkaline ◽  
Nw Iran ◽  
Neotethys Ocean ◽  
High K ◽  
Felsic Dikes ◽  
Spider Diagrams ◽  
Shrimp Zircon

Abstract Granitoids of the composite Shahjahan batholith in the northernmost part of the Urmia-Dokhtar magmatic arc of Iran, and southernmost of the Lesser Caucasus (South Armenia) show SHRIMP zircon ages of 37.1±1.2 to 47.1±4.5 Ma. Dioritic rocks of the pluton with an age of 46.6 ± 4.6 to 47.1 ± 4.5 Ma are calk-alkaline to high-K calc-alkaline, metaluminous and I-type. They show arc-related affinities, characterized by LREE and LILE enrichment and HREE and HFSE depletion, especially negative Ti, Nb and Ta anomalies (TNT effect) in the normalized spider diagrams. low Ce/Pb, Nb/La and high Ba/Nb, U/Th and Hf/Zr ratios along with positive Pb, K, Th and Sr anomalies in the normalized spider diagrams for the studied samples are compatible with magma contamination with crustal materials during ascend to the lower crustal levels. Felsic dikes with granodiorite and syenite compositions and 37.1 ± 1.2 to 38.57 ± 0.41 Ma old, are characterized by high-K calc-alkaline to shoshonitic, metaluminous, and A2- type affinities which show post-collision tectonic setting geochemical features. The REE patterns for all studied samples and the composition of the trace element ratios indicate a geochemically enriched spinel-lherzolite lithospheric mantle source for the magmas, which underwent a low degree of partial melting. Dating arc-related dioritic samples and post collision felsic dikes put constrain on timing of Neotethys Ocean closure in NW Iran. Based on the present study, Middle to Upper Eocene is suggested as closure time of the Neotethys Ocean, Arabia and Central Iran plates’ collision and crustal thickening in Northwest Iran.

scholarly journals Chemical characteristics of chromian spinel in plutonic rocks: Implications for deep magma processes and discrimination of tectonic setting

Island Arc ◽  
2010 ◽  
Vol 20 (1) ◽  
pp. 125-137 ◽  
Author(s):  
Shoji Arai ◽  
Hidenobu Okamura ◽  
Kazuyuki Kadoshima ◽  
Chima Tanaka ◽  
Kenji Suzuki ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Chromian Spinel ◽  
Chemical Characteristics ◽  
Plutonic Rocks

Plutonic ages and tectonic setting of the Algonquin and Muskoka allochthons, Central Gneiss Belt, Grenville Province, Ontario

1998 ◽  
Vol 35 (12) ◽  
pp. 1423-1438 ◽  
Author(s):  
Léopold Nadeau ◽  
Otto van Breemen
Keyword(s):  
Direct Evidence ◽  
Tectonic Setting ◽  
Structural Relationship ◽  
Structural Position ◽  
Grenville Province ◽  
Plutonic Rocks ◽  
Central Gneiss Belt ◽  
Laurentian Margin

The Central Gneiss Belt comprises parautochthonous gneisses overlain by northwest-transported allochthonous terranes originating from the pre-Grenvillian Laurentian margin or from farther outboard as inferred for the Parry Sound allochthon. In the Huntsville region, orthogneisses of the Algonquin allochthon yielded U-Pb zircon igneous crystallization ages at 1444 +12-8, 1442 +9-8, and 1432 +54-98 Ma. In absence of direct evidence for older intrusions, the association of these plutonic rocks with gneisses giving Nd crustal residence ages of ca. 1.7 Ga sets the Algonquin allochthon apart from the underlying parautochthon, and from the overlying Muskoka allochthon. Orthogneisses from the latter also give zircon igneous ages at 1453 ± 6 Ma and 1427 +16-13 Ma, with no older memory. These ages closely correspond to the Nd model ages of associated gneisses, testifying to the juvenile nature of this terrane. Plutonic ages from the Algonquin and Muskoka allochthons are older than those of the Parry Sound allochthon to the northwest, thereby confirming its exotic nature. The importance, distribution, and nature of 1475-1410 Ma plutonism down structural section from the juvenile Muskoka allochthon, via the more mature Algonquin allochthon, into the parautochthon and Grenville foreland, testify to the development of an ensialic arc along that part of the Laurentian margin tectonically incorporated in the Central Gneiss Belt. Furthermore, the age and structural relationship require Grenvillian break-back thrust reactivation to account for the high structural position of the Muskoka allochthon, which was part of the Laurentian ramp during overthrusting of the younger and farther travelled Parry Sound allochthon.

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