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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

File Details

Depositor

H. Andikagumi

Date Uploaded

28 May 2019, 09:05:51

Date Modified

30 May 2019, 11:05:26

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Characterization

File format: zip (ZIP Format)

Mime type: application/zip

File size: 9135

Last modified: 2019:05:28 10:59:07+01:00

Filename: Supporting_Information-Upper_Plate_Stress_Controls_the_Distribution_of_Mariana_Arc_Volcanoes.zip

Original checksum: 8b12bb269c63527c7048604c20d172fa