scholarly journals Velocity Weakening of Simulated Augite Gouge at Hydrothermal Conditions: Implications for Frictional Slip of Pyroxene‐Bearing Mafic Lower Crust

2019 ◽  
Vol 124 (7) ◽  
pp. 6428-6451 ◽  
Author(s):  
Ping Tian ◽  
Changrong He
Keyword(s):  
Lower Crust ◽  
Hydrothermal Conditions ◽  
Frictional Slip ◽  
Mafic Lower Crust

Latest Cretaceous “A2-type” granites in the Sakarya Zone, NE Turkey: Partial melting of mafic lower crust in response to roll-back of Neo-Tethyan oceanic lithosphere

Lithos ◽  
2018 ◽  
Vol 302-303 ◽  
pp. 312-328 ◽  
Author(s):  
Orhan Karsli ◽  
Faruk Aydin ◽  
Ibrahim Uysal ◽  
Abdurrahman Dokuz ◽  
Mustafa Kumral ◽  
...  
Keyword(s):  
Partial Melting ◽  
Lower Crust ◽  
Oceanic Lithosphere ◽  
Sakarya Zone ◽  
Roll Back ◽  
Mafic Lower Crust

Frictional slip of granite at hydrothermal conditions

1995 ◽  
Vol 100 (B7) ◽  
pp. 13045-13064 ◽  
Author(s):  
Michael L. Blanpied ◽  
David A. Lockner ◽  
James D. Byerlee
Keyword(s):  
Hydrothermal Conditions ◽  
Frictional Slip

Seismic imaging of the upper mantle beneath the Rocky Mountain foreland, southwestern Alberta

2000 ◽  
Vol 37 (11) ◽  
pp. 1493-1507 ◽  
Author(s):  
David W Eaton ◽  
Gerald M Ross ◽  
Frederick A Cook ◽  
A VanderVelden
Keyword(s):  
Upper Mantle ◽  
Lower Crust ◽  
Rocky Mountain ◽  
Seismic Signal ◽  
Ductile Deformation ◽  
Crust And Upper Mantle ◽  
Western Canada Sedimentary Basin ◽  
Tectonic Belt ◽  
Canada Sedimentary Basin ◽  
Mafic Lower Crust

The Vibroseis Augmented Listen Time (VAuLT) experiment is a special seismic-reflection survey designed to image the fine-scale structure of the continental upper mantle of the Rocky Mountain foreland in southwestern Alberta to depths of 200 km or more. Two mutually perpendicular profiles were acquired across and within the Vulcan structure, a roughly east-west-trending tectonic belt in the crystalline basement beneath the Western Canada Sedimentary Basin that separates the Medicine Hat block from the Loverna block. Relative-amplitude-preserving processing procedures were developed to estimate the seismic-signal-penetration limit, which varies between 100 and 220 km depth. Amplitude-decay analysis and Q estimation show that a seismically unreflective zone within the Vulcan structure is not caused by inadequate signal penetration. This blank zone is interpreted as part of an intrusive complex that has overprinted the preexisting structural fabric. Unlike most other parts of Alberta, the reflection Moho is indistinct and the uppermost mantle (45–60 km depth) is reflective, particularly for source–receiver offsets >10 km. South-dipping reflectivity in the lower crust and upper mantle beneath the Loverna block and northern Vulcan structure gives way to subhorizontal reflectivity beneath the Medicine Hat block. We interpret this reflectivity as compositional layering and (or) zones of ductile deformation that were previously part of the mafic lower crust, but that have now undergone metamorphic transformation to eclogite. The deepest observed reflection is an isolated, gently north-dipping event at ~120 km depth.

Generation of the Early Cenozoic adakitic volcanism by partial melting of mafic lower crust, Eastern Turkey: Implications for crustal thickening to delamination

Lithos ◽  
2010 ◽  
Vol 114 (1-2) ◽  
pp. 109-120 ◽  
Author(s):  
Orhan Karsli ◽  
Abdurrahman Dokuz ◽  
İbrahim Uysal ◽  
Faruk Aydin ◽  
Raif Kandemir ◽  
...  
Keyword(s):  
Partial Melting ◽  
Lower Crust ◽  
Crustal Thickening ◽  
Eastern Turkey ◽  
Mafic Lower Crust ◽  
Early Cenozoic
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