نتایج جستجو برای: supra subduction

تعداد نتایج: 12516  

Journal: :Geological Society of America Bulletin 2022

In the Appalachian Mountains of Vermont, USA, variably serpentinized ultramafic rocks mark Ordovician Taconic orogenic suture zone. These provide evidence for several alteration events that occurred during orogenesis. The largest these bodies occurs as a partially meta-dunite located in East Dover, Vermont. Whole-rock X-ray fluorescence spectroscopy and electron microprobe data on samples are i...

Journal: :Journal of African Earth Sciences 2022

Serpentinized peridotite and associated listvenites of Neoproterozoic age outcrop in the Bir Umq area western Saudi Arabia. The mantle section ophiolite is extensively serpentinized. Serpentinite host samples are low Al2O3 (0.48–0.75 wt%) CaO (0.28–1.24 have high Mg# (0.90–0.92), indicating a strongly depleted protolith, typically with supra-subduction zone environments more specifically fore-a...

پایان نامه :موزه جانورشناسی دانشگاه تهران 1387

توده افیولیتی خواجه جمالی در شمال شرق شیراز و هم امتداد با تود? افیولیتی نیریز قرار دارد و قسمتی از کمربند افیولیتی زاگرس رورانده می باشد. بر مبنای مشاهدات صحرایی و مطالعات مقاطع نازک این توده شامل هارزبورژیت، دونیت، پیروکسنولیت، گدازه بازالتی و پیلولاوا، همراه با رسوبات پلاژیک می باشد. الترامافیک ها بیشترین واحد های لیتولوژیکی منطقه را تشکیل می دهد، که کم و بیش سرپانتینی و لیستونیتی شده اند. ب...

2014
A. Kandil O. A. E. Tantawy S. A. El-Sheikh A. M. Abd El-latif

The concept of soft ideal was first introduced by Kandil et al. [13]. In 1999, Molodtsov [22] introduced the concept of soft sets as a general mathematical tool for dealing with uncertain objects. The concept of generalized closed soft sets in soft topological spaces was introduced by Kannan [15] in 2012. The notions of supra soft topological space were first introduced by Kandil et al. [14]. I...

2009
Robert McCaffrey

[1] An approach to invert GPS time series to estimate crustal block rotations, fault locking and strain rates while simultaneously solving for transient slow slip events is described and applied to the northern Cascadia subduction zone. The method can use continuous or survey mode GPS time series or both. I invert 5.6 years of 3-component continuous GPS time series at 53 sites from Cascadia to ...

2007
C. DeMets

The October, 1995 Mw 8.0 Jalisco subduction earthquake has provided a thorough geodetic observation of the coseismic subduction process. An 11 station regional GPS network located directly onshore of the rupture demonstrates consistent vertical subsidence verified by tide gauge data and southwest-directed extension, with measured displacements reaching I meter. Unusually shallow and non-uniform...

Journal: :Science 2007
Nadege Hilairet Bruno Reynard Yanbin Wang Isabelle Daniel Sebastien Merkel Norimasa Nishiyama Sylvain Petitgirard

The supposed low viscosity of serpentine may strongly influence subduction-zone dynamics at all time scales, but until now its role could not be quantified because measurements relevant to intermediate-depth settings were lacking. Deformation experiments on the serpentine antigorite at high pressures and temperatures (1 to 4 gigapascals, 200 degrees to 500 degrees C) showed that the viscosity o...

2010
rin Wirth Maureen D. Long

Despite its importance for ourunderstandingof physical processes associatedwith subduction, the geometry of mantle flow in subduction zones remains poorly understood, particularly in the mantle wedge above subducting slabs. Constraints onmantle flowanddeformation canbeobtainedbymeasurements of shearwave splitting, a valuable tool used to characterize the geometry and strength of seismic anisotr...

2006
Robert L. King Gray E. Bebout Takuya Moriguti Eizo Nakamura

We present major and trace element concentrations in conjunction with Sr–Nd isotope ratios to investigate the geochemical characteristics of mélange formation along the subduction zone slab–mantle interface. Mélange matrix of the Catalina Schist formed within an active subduction zone of the southern California borderland in Cretaceous time. Mélange formed through the synergistic effects of def...

Journal: :Journal of Infusion Nursing 2015

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