The Takhte-Soleyman ortho-amphibolites as a part of Takab metamorphic complex are located in Northeast Takab. These rocks consist of amphibolite, Garnet-amphibolite, Kyanite-Garnet-amphibolite, Hornblendite and Epidote-amphibolite. Petrography and whole-rock geochemistry show that andesitic -basalt and/or their intrusive equivalents with calc-alkaline to tholeiitic affinity and even a peridotite can be their protoliths. Trace element and Sr-Nd ratios imply that these rocks were from mantle melt sources. In chondrite normalized plots, these amphibolites can be classified into at least two groups. The first group is characterized by LREE depletion relative to HREEs and some with flat patterns. The second has an enrichment of LREEs relative to HREEs. These two different patterns and some other geochemical characters suggest MORB or MORB-like and arc geochemical affinities of the parental magmas. This can be related to the time progressive evolution of magmatism either from MORB or Back-arc to Arc or from Arc to Bak-arc setting.

Geochemistry and origin of the ortho- amphiboltes in Thakhte-Soleyman (NE Takab)

Carmela Vaccaro
Membro del Collaboration Group
;
2021

Abstract

The Takhte-Soleyman ortho-amphibolites as a part of Takab metamorphic complex are located in Northeast Takab. These rocks consist of amphibolite, Garnet-amphibolite, Kyanite-Garnet-amphibolite, Hornblendite and Epidote-amphibolite. Petrography and whole-rock geochemistry show that andesitic -basalt and/or their intrusive equivalents with calc-alkaline to tholeiitic affinity and even a peridotite can be their protoliths. Trace element and Sr-Nd ratios imply that these rocks were from mantle melt sources. In chondrite normalized plots, these amphibolites can be classified into at least two groups. The first group is characterized by LREE depletion relative to HREEs and some with flat patterns. The second has an enrichment of LREEs relative to HREEs. These two different patterns and some other geochemical characters suggest MORB or MORB-like and arc geochemical affinities of the parental magmas. This can be related to the time progressive evolution of magmatism either from MORB or Back-arc to Arc or from Arc to Bak-arc setting.
Khodaean Chegeni, Ziba; Rashidnejad Omran, Nematollah; Akbar Baharifar, Ali; Nozaem, Reza; Vaccaro, Carmela; Francisco Santos, José
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2480635
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