...Alan P. M. Vaughan; Craig Storey; Simon P. Kelley; Tiffany L. Barry; Michael L. Curtis Abstract New structural and geochronological data from the Eastern Palmer Land Shear Zone, in the vicinity of Beaumont Glacier, provide the first evidence of dated structural control on emplacement of the 119–95...

... processes (extruding a layer of melt-weakened crust, bounded by lower thrust-sense and upper normal-sense ductile shear zones, and flowing between stronger lower and upper crust) ( Searle and Rex 1989 ; Grujic et al. 1996 ; Beaumont et al. 2001 ; Searle et al. 2003 , 2010 ; Godin et al. 2006 ; Cottle...

... the summit shows the gentle north-dipping Qomolangma Detachment extending along the Rongbuk glacier for >70 km to the north. The black rocks of the Everest Series are structurally thinned out towards the north as the Qomolangma and Lhotse detachments merge into a single large ductile shear zone. On Cho...

... subparallel to the N-striking Alpine fault. Farther west, their mean strike swings through ∼40° to define a smoothly arcuate pattern across the central zone that mimics the westwardly convex outcrop of textural zones ( Figs. 2A and 4B ). To the west of Fox Glacier, the shears strike NNE at a high angle...

... and horizontal along the Rongbuk glacier and to the north ( Fig. 5 e and f). The Qomolangma detachment merges with the Lhotse detachment north of Rongbuk monastery to form one large shear zone ( Fig. 5 g), which places the highly folded sediments of the north Indian plate margin ( Fig. 5 h) directly over...

... CITED Aikman , A.B. , Harrison , T.M. , and Ding , L. , 2008 , Evidence for early (>44 Ma) Himalayan crustal thickening, Tethyan Himalaya, southeastern Tibet : Earth and Planetary Science Letters , v. 274 , p. 14 – 23 , doi:10.1016/j.epsl.2008.06.038. Beaumont , C...

...Ruud Weijermars; Martin P. A. Jackson ABSTRACT Peak-stress zones and pressure anomalies around wellbores through moving salt bodies threaten well integrity. Our study provides a conceptual framework to identify the depth of peak zones of shear stress in moving salt sheets, whether autochthonous...

.... These rates balance the rock uplift rate. Glacial processes yield a more complicated landscape than a non-glacial one. In a dynamic equilibrium, the same combination as described above of river incision and landsliding operates below the glacial zone. In the topographic region below the glaciers...

... is found. Weathering takes the form of oxidation followed by leaching of carbonates and is characterized by colour change, increasing content of rotten boulders, and prismatic gleyed jointing. Within the weathering profile four distinct weathering zones can be recognized. Clay and moisture contents...

... correspond to lower crustal material or a mixture of serpentinized upper mantle material with lower crustal material. The existence of this zone on both sides of the margin does not support a hypothesis of a simple shear-style opening along a lithospheric detachment fault. Some of the observed asymmetry may...

... of the Tethyan sedimentary sequence, towards the terminus of the Chhonbarban glacier and the head of the Myagdi Khola, a structurally downward- and southward-increasing strain gradient culminates in a zone of high strain within the Larjung Formation (Fig. 4 ). From Dhaulagiri base camp to the south, well...

... ). Figure 3. Simplified geologic map of the Zanskar River basin after Fuchs (1987) with additions for Zanskar Shear Zone from Dèzes et al. (1999) , southern Zanskar (Lahul) from Steck et al. (1993) , and Tso Kar area from Epard and Steck (2008) . Sample locations are noted with white dots. N-T...

..., amphibolite-facies−derived mylonite zone in the hanging wall. Their mineralogy matches low-grade protoliths that occur 100–110 km to the southeast. This displacement is compatible with distributed lateral and vertical shear within the mylonite zone since inception of significant convergence on the plate...

... by simple shear concentrated near the base of the salt allochthon in a zone of boundary shear. Accordingly, originally vertical markers deform into the concave-upward pattern typical of ice glaciers and other gravity-spreading systems ( Figure 3 ) ( Nye, 1951 ; Merle, 1986 , 1989 ; Hubbard and Hubbard...

... zone might be for muscovite and biotite in these areas, or whether it gives way to consistent Mesozoic zone 1 ages to the southeast. Biotite K-Ar ages along the Franz Josef Glacier transect (Fig. 2) vary between 1.01 ± 0.03 Ma and 1.19 ± 0.03 Ma over the interval sampled (Fig. 5C) . Muscovite...

..., intruding up as far as the Triassic sediments. We have mapped a newly discovered 350–400-m-thick shear zone of high-strain mylonites along the upper Nar Valley and Pangre glacier (Phu Detachment = STD ), west of the Manaslu-Himlung massif, which wraps around the northern (upper) margin of the Manaslu...

... and tectonic setting together with the glaciated landscape gives rise to major active fault systems, thrusts and shear zones, together with a variety of problematic soils. These conditions present substantial geohazards including deep-seated gravitational failures (sackung), rockfalls, debris flows, mudslides...