Late Cenozoic intraplate volcanism in Changbai volcanic field, on the border of China and North Korea: insights into deep subduction of the Pacific slab and intraplate volcanism

2014 ◽  
Vol 172 (5) ◽  
pp. 648-663 ◽  
Author(s):  
Maoliang Zhang ◽  
Zhengfu Guo ◽  
Zhihui Cheng ◽  
Lihong Zhang ◽  
Jiaqi Liu
Keyword(s):  
North Korea ◽  
Volcanic Field ◽  
Late Cenozoic ◽  
Intraplate Volcanism ◽  
The Pacific ◽  
Pacific Slab

Late Cenozoic uplift of western Turkey: Improved dating of the Kula Quaternary volcanic field and numerical modelling of the Gediz River terrace staircase

2006 ◽  
Vol 51 (3-4) ◽  
pp. 131-171 ◽  
Author(s):  
Rob Westaway ◽  
Hervé Guillou ◽  
Sema Yurtmen ◽  
Anthony Beck ◽  
David Bridgland ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Volcanic Field ◽  
River Terrace ◽  
Late Cenozoic ◽  
Western Turkey ◽  
Gediz River

scholarly journals Constraints on the rheology of the lower crust in a strike-slip plate boundary: evidence from the San Quintín xenoliths, Baja California, Mexico

Solid Earth ◽  
2017 ◽  
Vol 8 (6) ◽  
pp. 1211-1239 ◽  
Author(s):  
Thomas van der Werf ◽  
Vasileios Chatzaras ◽  
Leo Marcel Kriegsman ◽  
Andreas Kronenberg ◽  
Basil Tikoff ◽  
...  
Keyword(s):  
Grain Size ◽  
Upper Mantle ◽  
Lower Crust ◽  
Baja California ◽  
Plate Boundary ◽  
Volcanic Field ◽  
Strike Slip ◽  
Low Viscosity ◽  
The Pacific ◽  
Flow Laws

Abstract. The rheology of lower crust and its transient behavior in active strike-slip plate boundaries remain poorly understood. To address this issue, we analyzed a suite of granulite and lherzolite xenoliths from the upper Pleistocene–Holocene San Quintín volcanic field of northern Baja California, Mexico. The San Quintín volcanic field is located 20 km east of the Baja California shear zone, which accommodates the relative movement between the Pacific plate and Baja California microplate. The development of a strong foliation in both the mafic granulites and lherzolites, suggests that a lithospheric-scale shear zone exists beneath the San Quintín volcanic field. Combining microstructural observations, geothermometry, and phase equilibria modeling, we estimated that crystal-plastic deformation took place at temperatures of 750–890 °C and pressures of 400–560 MPa, corresponding to 15–22 km depth. A hot crustal geotherm of 40 ° C km−1 is required to explain the estimated deformation conditions. Infrared spectroscopy shows that plagioclase in the mafic granulites is relatively dry. Microstructures are interpreted to show that deformation in both the uppermost lower crust and upper mantle was accommodated by a combination of dislocation creep and grain-size-sensitive creep. Recrystallized grain size paleopiezometry yields low differential stresses of 12–33 and 17 MPa for plagioclase and olivine, respectively. The lower range of stresses (12–17 MPa) in the mafic granulite and lherzolite xenoliths is interpreted to be associated with transient deformation under decreasing stress conditions, following an event of stress increase. Using flow laws for dry plagioclase, we estimated a low viscosity of 1.1–1.3×1020 Pa ⋅ s for the high temperature conditions (890 °C) in the lower crust. Significantly lower viscosities in the range of 1016–1019 Pa ⋅ s, were estimated using flow laws for wet plagioclase. The shallow upper mantle has a low viscosity of 5.7×1019 Pa ⋅ s, which indicates the lack of an upper-mantle lid beneath northern Baja California. Our data show that during post-seismic transients, the upper mantle and the lower crust in the Pacific–Baja California plate boundary are characterized by similar and low differential stress. Transient viscosity of the lower crust is similar to the viscosity of the upper mantle.

Geochemical constraints on the origin of late Cenozoic basalts in the Mt. Changbai volcanic field, NE China: evidence for crustal recycling

2019 ◽  
Vol 62 (17) ◽  
pp. 2125-2145 ◽  
Author(s):  
Ming Lei ◽  
Zhengfu Guo ◽  
Yutao Sun ◽  
Maoliang Zhang ◽  
Lihong Zhang ◽  
...  
Keyword(s):  
Volcanic Field ◽  
Late Cenozoic ◽  
Ne China ◽  
Crustal Recycling ◽  
Geochemical Constraints

Seismic tomography of the Pacific slab edge under Kamchatka

2009 ◽  
Vol 465 (1-4) ◽  
pp. 190-203 ◽  
Author(s):  
Guoming Jiang ◽  
Dapeng Zhao ◽  
Guibin Zhang
Keyword(s):  
Seismic Tomography ◽  
The Pacific ◽  
Pacific Slab
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