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2 results for “Tso Morari”
EPMA dataset - Tso Morari granites
<p>Accompanying datatset for publiication entitled <strong>"The emplacement, alteration, subduction and metamorphism of metagranites from the Tso Morari complex, Ladakh Himalaya"</strong></p> <p>Thin sections were made from 11 macroscopically undeformed granite samples from the Tso Morari complex. Samples 11-01, 11-02, L08-04 and a05-10 were selected for detailed petrological analysis. Major element compositions of minerals that exhibit solid solutions were measured using a Cameca SX-5 field emission electron microprobe (EMPA) at the Department of Earth Sciences, University of Oxford. All EMPA analyses were conducted with 15 keV acceleration potential, 20 nA beam current. For all major elements, the on-peak count time was 30 seconds with 30 seconds background count. Ti was measured with a 60 seconds on-peak count time and 60 seconds background collection. A range of natural and synthetic oxide standards were used including albite (Na, Al, Si), MgO (Mg), wollastonite (Ca), andradite (Fe), Mn (Mn) and TiO<sub>2</sub> (Ti) and analyses were verified against secondary mineral standards. Raw analyses were automatically corrected for atomic number, absorption and fluorescence using the <em>phi-rho-z</em> matrix correction routine (Merlet, 1994). Mineral spot analyses and line profiles were taken across white mica and garnet to determine the extent of intracrystalline compositional variation.</p>
Thermometry and microstructural analysis imply protracted extensional exhumation of the Tso Morari UHP nappe, northwestern Himalaya: implications for models of UHP exhumation
<p>Documenting the processes that facilitate exhumation of ultra-high pressure (UHP) rocks at convergent margins is critical for understanding orogen dynamics. Here, we present structural and temperature data from the Himalayan UHP Tso Morari nappe (TMN) and overlying nappes, which we integrate with published pressure-temperature-time constraints to refine interpretations for their structural evolution and exhumation history. Our data indicate that the 5.5 km-thick TMN is the upper portion of a penetratively deformed ductile slab, which was extruded via distributed, pure shear-dominated, top-down-to-east shearing. Strain in the TMN is recorded by high-strength quartz fabrics (density norms between 1.74-2.86) and finite strain data that define 63% transport-parallel lengthening and 46% transport-normal shortening. The TMN attained peak temperatures of ~500-600°C, which decrease in the overlying Tetraogal and Mata nappes to ~150-300°C, defining a field gradient as steep as 67°C/km. Within the overlying nappes, quartz fabric strength decreases (density norms between 1.14-1.21) and transport-parallel lengthening and transport-normal shortening decrease to 14% and 18%, respectively. When combined with published 40Ar/39Ar thermochronometry, quartz fabric deformation temperatures as low as ~330°C indicate that the top-to-east shearing that exhumed the TMN continued until ~30 Ma. Peak temperatures constrain the maximum depth of the overlying Mata nappe to 12.5-17.5 km; when combined with published fission-track thermochronometry, this provides further support that the TMN was not underplated at upper-crustal levels until ~30 Ma. The long-duration, convergence-subnormal shearing that exhumed the TMN outlasted rapid India-Asia convergence by ~15 Myr and may be the consequence of strain partitioning during oblique convergence.</p>
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