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A short, sharp pulse of potassium -rich volcanism during continental collision and subduction

A short, sharp pulse of potassium -rich volcanism during continental collision and subduction
A short, sharp pulse of potassium -rich volcanism during continental collision and subduction
Potassic volcanic rocks are characteristic of collisional tectonic zones, with recyclingof continental crust playing an important role in their generation. Potassium-rich partial melts and/or fluids derived from subducted continental material initiate and/or mix with mantle-derived melts and then erupt at the surface with varying degrees of interaction with the overlying lithosphere. The details of how continental material incorporates into mantle melts are, however, uncertain. In particular, the depths from which the potassium-rich fluids/melts are released from the continental material and then reacts with the mantle-derived melts remain a subject of debate. We have measured the boron isotope composition of volcanic rocks from Western Anatolia that erupted between 52– 0.1 Ma, and span the lifetime of collisional events from initial arc-type eruptions to post collisional volcanism. These data and other geochemical indices show that ultra-potassicvolcanism was mainly confined to a narrow window between ~20–15Ma, consistent withrecycling of high-pressure phengite, with the timing of the potassic volcanism coincident with slab roll-back and break-off.
0091-7613
1079-1082
Palmer, Martin
d2e60e81-5d6e-4ddb-a243-602537286080
Ersoy, E. Yalçın
2c4e6074-ea3b-4404-9faa-5e53611bff06
Akal, Cüneyt
52b90c9f-3ac1-437f-a7b0-c1f84bc21027
Uysal, İbrahim
8557da7a-eb5e-47e7-a4fe-583c2ca45e47
Genç, Ş. Can
7e3ebfd4-2207-4ab0-b23f-54f903916839
Banks, L.A.
e39c44dc-ad7c-4c8d-9a76-19587de0d437
Cooper, Matthew
54f7bff0-1f8c-4835-8358-71eef8529e7a
Milton, James
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Zhao, K.D.
d7e06d05-4952-4048-b668-628bec917e3d
Palmer, Martin
d2e60e81-5d6e-4ddb-a243-602537286080
Ersoy, E. Yalçın
2c4e6074-ea3b-4404-9faa-5e53611bff06
Akal, Cüneyt
52b90c9f-3ac1-437f-a7b0-c1f84bc21027
Uysal, İbrahim
8557da7a-eb5e-47e7-a4fe-583c2ca45e47
Genç, Ş. Can
7e3ebfd4-2207-4ab0-b23f-54f903916839
Banks, L.A.
e39c44dc-ad7c-4c8d-9a76-19587de0d437
Cooper, Matthew
54f7bff0-1f8c-4835-8358-71eef8529e7a
Milton, James
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Zhao, K.D.
d7e06d05-4952-4048-b668-628bec917e3d

Palmer, Martin, Ersoy, E. Yalçın, Akal, Cüneyt, Uysal, İbrahim, Genç, Ş. Can, Banks, L.A., Cooper, Matthew, Milton, James and Zhao, K.D. (2019) A short, sharp pulse of potassium -rich volcanism during continental collision and subduction. Geology, 47 (11), 1079-1082. (doi:10.1130/G45836.1).

Record type: Article

Abstract

Potassic volcanic rocks are characteristic of collisional tectonic zones, with recyclingof continental crust playing an important role in their generation. Potassium-rich partial melts and/or fluids derived from subducted continental material initiate and/or mix with mantle-derived melts and then erupt at the surface with varying degrees of interaction with the overlying lithosphere. The details of how continental material incorporates into mantle melts are, however, uncertain. In particular, the depths from which the potassium-rich fluids/melts are released from the continental material and then reacts with the mantle-derived melts remain a subject of debate. We have measured the boron isotope composition of volcanic rocks from Western Anatolia that erupted between 52– 0.1 Ma, and span the lifetime of collisional events from initial arc-type eruptions to post collisional volcanism. These data and other geochemical indices show that ultra-potassicvolcanism was mainly confined to a narrow window between ~20–15Ma, consistent withrecycling of high-pressure phengite, with the timing of the potassic volcanism coincident with slab roll-back and break-off.

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Accepted/In Press date: 27 August 2019
e-pub ahead of print date: 23 September 2019

Identifiers

Local EPrints ID: 433803
URI: http://eprints.soton.ac.uk/id/eprint/433803
ISSN: 0091-7613
PURE UUID: 0690cc70-17d8-46f8-a48c-7f8460a67fb7
ORCID for Matthew Cooper: ORCID iD orcid.org/0000-0002-2130-2759

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Date deposited: 04 Sep 2019 16:30
Last modified: 18 Feb 2021 16:57

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Contributors

Author: Martin Palmer
Author: E. Yalçın Ersoy
Author: Cüneyt Akal
Author: İbrahim Uysal
Author: Ş. Can Genç
Author: L.A. Banks
Author: Matthew Cooper ORCID iD
Author: James Milton
Author: K.D. Zhao

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