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Extreme hydrothermal conditions at an active plate-bounding fault.

Abstract：

:Temperature and fluid pressure conditions control rock deformation and mineralization on geological faults, and hence the distribution of earthquakes. Typical intraplate continental crust has hydrostatic fluid pressure and a near-surface thermal gradient of 31 ± 15 degrees Celsius per kilometre. At temperatures above 300-450 degrees Celsius, usually found at depths greater than 10-15 kilometres, the intra-crystalline plasticity of quartz and feldspar relieves stress by aseismic creep and earthquakes are infrequent. Hydrothermal conditions control the stability of mineral phases and hence frictional-mechanical processes associated with earthquake rupture cycles, but there are few temperature and fluid pressure data from active plate-bounding faults. Here we report results from a borehole drilled into the upper part of the Alpine Fault, which is late in its cycle of stress accumulation and expected to rupture in a magnitude 8 earthquake in the coming decades. The borehole (depth 893 metres) revealed a pore fluid pressure gradient exceeding 9 ± 1 per cent above hydrostatic levels and an average geothermal gradient of 125 ± 55 degrees Celsius per kilometre within the hanging wall of the fault. These extreme hydrothermal conditions result from rapid fault movement, which transports rock and heat from depth, and topographically driven fluid movement that concentrates heat into valleys. Shear heating may occur within the fault but is not required to explain our observations. Our data and models show that highly anomalous fluid pressure and temperature gradients in the upper part of the seismogenic zone can be created by positive feedbacks between processes of fault slip, rock fracturing and alteration, and landscape development at plate-bounding faults.

journal_name

Nature

journal_title

Nature

authors

Sutherland R,Townend J,Toy V,Upton P,Coussens J,Allen M,Baratin LM,Barth N,Becroft L,Boese C,Boles A,Boulton C,Broderick NGR,Janku-Capova L,Carpenter BM,Célérier B,Chamberlain C,Cooper A,Coutts A,Cox S,Craw L,Do

doi

10.1038/nature22355

subject

Has Abstract

pub_date

2017-06-01 00:00:00

pages

137-140

issue

7656

eissn

0028-0836

issn

1476-4687

pii

nature22355

journal_volume

546

pub_type

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