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Origin and significance of tourmalinites and tourmaline-bearing rocks of Menderes Massif, western Anatolia, Turkey

Origin and significance of tourmalinites and tourmaline-bearing rocks of Menderes Massif, western Anatolia, Turkey
Origin and significance of tourmalinites and tourmaline-bearing rocks of Menderes Massif, western Anatolia, Turkey
In the western central portion of Anatolia lies the Menderes Massif — a large metamorphic crystalline complex made of Neoproterozoic to Precambrian basement rocks overlain by Palaeozoic to early Tertiary metasedimentary rocks, and with a multistage metamorphic evolution developed from the late Neo-Proterozoic to Eocene. We have undertaken a study of the petrology, geochemistry and boron isotope composition of these tourmaline occurrences aiming to constrain the processes responsible for the enrichment of boron and other fluid mobile elements in the Menderes Massif. The dispersed tourmaline has chemical and boron isotope compositions typical of a continental crust setting, but while some of the tourmalinites display similar signatures, others have heavier boron isotope compositions (up to + 7.5‰). We suggest that the tourmalinites with continental characteristics formed part of the original Pan African basement rocks, whereas those with heavier ?11B signatures formed by later metamorphism during the Alpine orogeny, possibly through interaction with subduction-like fluids. This proposed process may also have been coincident with metasomatism of the lithospheric mantle beneath the massif, which is known to have experienced multistage metasomatism and enrichment history up to Neogene time.
Tourmalinites, Geochemistry, Boron isotope, Menderes Massif, Western Anatolia, Turkey
0024-4937
22-36
Yücel-Öztürk, Yeşim
6decaf6d-5ab7-420f-938a-83fbd51b4524
Helvacı, Cahit
1bf18566-d59b-45fc-ba93-c81b2203e9d5
Palmer, Martin R.
d2e60e81-5d6e-4ddb-a243-602537286080
Ersoy, E. Yalçın
2c4e6074-ea3b-4404-9faa-5e53611bff06
Freslon, Nicolas
fe30db04-652e-44af-a239-02de29429fb9
Yücel-Öztürk, Yeşim
6decaf6d-5ab7-420f-938a-83fbd51b4524
Helvacı, Cahit
1bf18566-d59b-45fc-ba93-c81b2203e9d5
Palmer, Martin R.
d2e60e81-5d6e-4ddb-a243-602537286080
Ersoy, E. Yalçın
2c4e6074-ea3b-4404-9faa-5e53611bff06
Freslon, Nicolas
fe30db04-652e-44af-a239-02de29429fb9

Yücel-Öztürk, Yeşim, Helvacı, Cahit, Palmer, Martin R., Ersoy, E. Yalçın and Freslon, Nicolas (2015) Origin and significance of tourmalinites and tourmaline-bearing rocks of Menderes Massif, western Anatolia, Turkey. Lithos, 218-219, 22-36. (doi:10.1016/j.lithos.2015.01.009).

Record type: Article

Abstract

In the western central portion of Anatolia lies the Menderes Massif — a large metamorphic crystalline complex made of Neoproterozoic to Precambrian basement rocks overlain by Palaeozoic to early Tertiary metasedimentary rocks, and with a multistage metamorphic evolution developed from the late Neo-Proterozoic to Eocene. We have undertaken a study of the petrology, geochemistry and boron isotope composition of these tourmaline occurrences aiming to constrain the processes responsible for the enrichment of boron and other fluid mobile elements in the Menderes Massif. The dispersed tourmaline has chemical and boron isotope compositions typical of a continental crust setting, but while some of the tourmalinites display similar signatures, others have heavier boron isotope compositions (up to + 7.5‰). We suggest that the tourmalinites with continental characteristics formed part of the original Pan African basement rocks, whereas those with heavier ?11B signatures formed by later metamorphism during the Alpine orogeny, possibly through interaction with subduction-like fluids. This proposed process may also have been coincident with metasomatism of the lithospheric mantle beneath the massif, which is known to have experienced multistage metasomatism and enrichment history up to Neogene time.

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More information

Published date: March 2015
Keywords: Tourmalinites, Geochemistry, Boron isotope, Menderes Massif, Western Anatolia, Turkey
Organisations: Geochemistry

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Local EPrints ID: 377721
URI: http://eprints.soton.ac.uk/id/eprint/377721
ISSN: 0024-4937
PURE UUID: f816369f-b7e6-4929-a2aa-ea96c150b5f7

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Date deposited: 03 Jun 2015 13:54
Last modified: 01 Mar 2019 17:31

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