Supporting Information: Upper Plate Stress Controls the Distribution of Mariana Arc Volcanoes [dataset]

Macpherson, Colin G. (Durham University, UK); McCaffrey, Kenneth J. W. (Durham University, UK); Andikagumi, Harisma (Durham University, UK)

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Supporting Information: Upper Plate Stress Controls the Distribution of Mariana Arc Volcanoes [dataset] Open Access

We present a spatial analysis of volcano distribution and morphology in the young, intra-oceanic Mariana Arc. Both the quality of fit to and the divergence from idealised models indicate that volcanic centres are arranged into five great circle segments, rather than a single or multiple small circles. The alignment of magmatic centres suggests that magma transport is controlled by the stress regime in the deep crust and shallow lithospheric mantle of the Philippine Sea Plate, into which the arc is emplaced, and that arc-normal tension is the dominant process operating at such depths along the whole arc. Volcano morphologies indicate that the stress regime in the shallow crust varies between arc-normal extension and compression, which also implies that the stress field can vary with depth in the arc lithosphere. We show that this vertical stress partitioning can be related to the changing dip of the subducting Pacific Plate and its coupling distance with the Philippine Sea Plate. The variation in stress regime is consistent with both the distribution of seismicity in the Philippine Sea Plate and with the structural fabrics of the non-volcanic part of the plate margin to the south. Our analysis suggests that the upper plate exerts the principal control on the distribution of volcanoes in the Mariana Arc. Where the stress regime in the deep crust and shallow lithospheric mantle is sufficiently concentrated then a distinct volcanic front is produced.

Descriptions

Resource type: Dataset
Contributors: Creator: Andikagumi, Harisma ¹
Creator: Macpherson, Colin G. ¹
Contact person: Macpherson, Colin G. ¹
Creator: McCaffrey, Kenneth J. W. ¹

¹ Durham University, UK
Funder: Indonesia Endowment Fund for Education
Research methods
Other description
Keyword: Mariana Arc
Volcanoes
Lithosphere
Stress controls
Subject: Mariana Arc--Volcanoes
Plate tectonics--Stress
Location
Language: English
Cited in
Identifier: ark:/32150/r179407x18p
Rights: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA)
Publisher: Durham University
Date Created

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Date Uploaded: 28 May 2019, 09:05:51
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Last modified: 2019:05:28 10:59:07+01:00

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User N. Syrotiuk has updated Supporting Information: Upper Plate Stress Controls the Distribution of Mariana Arc Volcanoes [dataset]	almost 5 years ago
User N. Syrotiuk has updated Upper Plate Stress Controls: the Distribution of Mariana Arc Volcanoes [dataset]	almost 5 years ago
User N. Syrotiuk has updated Upper Plate Stress Controls: the Distribution of Mariana Arc Volcanoes [dataset]	almost 5 years ago