Modeling episodic fluid‐release events in the ductile carbonates of the Glarus thrust

Geophysical Research Letters - Tập 41 Số 20 - Trang 7121-7128 - 2014
Thomas Poulet1, Manolis Veveakis1, Marco Herwegh2, Thomas Buckingham2, Klaus Regenauer‐Lieb3
1CSIRO Mineral Resources, Bentley, Western Australia, Australia
2Institute of Geological Sciences, University of Bern, Bern, Switzerland
3School of Petroleum Engineering University of New South Wales Sydney New South Wales Australia

Tóm tắt

AbstractThe exposed Glarus thrust displays midcrustal deformation with tens of kilometers of displacement on an ultrathin layer, the principal slip zone (PSZ). Geological observations indicate that this structure resulted from repeated stick‐slip events in the presence of highly overpressured fluids. Here we show that the major characteristics of the Glarus thrust movement (localization, periodicity, and evidence of pressurized fluids) can be reconciled by the coupling of two processes, namely, shear heating and fluid release by carbonate decomposition. During this coupling, slow ductile creep deformation raises the temperature through shear heating and ultimately activates the chemical decomposition of carbonates. The subsequent release of highly overpressurized fluids forms and lubricates the PSZ, allowing a ductile fault to move tens of kilometers on millimeter‐thick bands in episodic stick‐slip events. This model identifies carbonate decomposition as a key process for motion on the Glarus thrust and explains the source of overpressured fluids accessing the PSZ.

Từ khóa


Tài liệu tham khảo

10.1002/2013JB010070

10.1046/j.1365-3121.2000.00310.x

10.2475/ajs.302.6.517

10.1144/jgs.157.6.1093

10.1007/BF00310462

10.1002/nag.963

10.1130/G34421.1

10.1007/s004100050335

10.1002/2014GL060438

10.1016/j.jsg.2007.03.007

10.1016/j.tecto.2007.07.004

10.1016/j.epsl.2007.10.041

10.1126/science.1139763

Heim A., 1922, Geologie der Schweiz. 2: Die Schweizer Alpen

10.1016/S0012-821X(03)00284-X

10.1016/j.epsl.2008.09.007

10.1007/s00015-008-1259-z

Hsü K. J., 1969, A preliminary analysis of the statics and kinetics of the Glarus overthrust, Eclogae Geol. Helv., 62, 143

10.1130/0016-7606(1959)70[115:ROFPIM]2.0.CO;2

10.1007/s00015-008-1265-1

10.1016/S0191-8141(97)00005-9

10.1017/CBO9780511754517

10.1007/978-1-4020-5672-7

10.1016/S0040-6031(02)00080-1

Miller S. A., 2013, Advances in Geophysics, 1

10.1016/j.jsg.2010.11.015

10.1016/0040-1951(80)90239-5

10.1002/2014JB011004

10.1029/2005JB004006

10.1016/S0191-8141(01)00015-3

10.2138/am.2009.3021

10.1016/j.epsl.2012.04.030

10.1130/G34901.1

10.1016/0040-1951(77)90120-2

10.1785/0120020061

10.1029/2008JB006004

UNESCO(2014) World Heritage Swiss Tectonic Arena Sardona. [Available athttp://www.unesco‐sardona.ch.]

10.1016/j.jmps.2010.06.010

10.1002/2013JB010071

10.2138/am-1999-5-620

Thông tin
Thông tin xuất bản

Geophysical Research Letters

Tập 41 Số 20

7121-7128

Thông tin tác giả