The calc-alkaline Ladakh batholith (NW Himalayas) was dated to constrain the timing of continental collision and subsequent deformation. Batholith growth ended when collision disrupted subduction of the Tethyan oceanic lithosphere, and thus the youngest magmatic pulse indirectly dates the collision. Both U-Pb ages on zircons from three samples of the Ladakh batholith and K-Ar from one subvolcan...

FERRIC-IRON stilpnomelane is triclinic, space group PI, a = 21.724 A, b = 21.724 A, c = 17.740 A, a = 124.14°, p = 95.86°, y = 120.0°, Z = 16. The structure is dominated by a subcell for which Ug = Ja, 6g = Jft, Cg = Jc, oig = a, |8g = /S, yg = y. The subcell reflections have h-k = 3w, and have a trigonal intensity distribution. The structure was determined from Patterson projections and by tri...

This paper is a complement to the Tectonometamorphic Map of the Canadian Shield, and contains a brief description of the metamorphic history of Proterozoic orogenic belts and rock sequences in the Canadian Shield in Ontario, with a focus on rocks of the Southern and Grenville provinces. Metamorphism in the Southern Province has generally been attributed to the Penokean orogeny (~1879–1820 Ma), ...

The structural and thermal relaxation overprint associated with the Neogene Alboran rifting have obscured early Alpine tectono-metamorphic evolution of Domain, representing metamorphic core Betic–Rif orogen western Mediterranean region. This study focuses on Beni Mzala unit, forming lower deeper level nappe stack (Upper Sebtides) in Moroccan Rif. Meso- micro-scale investigations are carried out...

Abstract During the collision of India and Eurasia, regional-scale strike-slip shear zones played a key role in accommodating lateral extrusion blocks, block rotation, vertical exhumation metamorphic rocks as presented by deformation on Ailao Shan-Red River zone (ARSZ) Eastern Himalayan Syntaxis region western Yunnan, China. We report structural, mica Ar/Ar, apatite fission-track (AFT), (U-Th)/...

The accommodation of low-temperature ductile deformation in foreland fold-and-thrust belts is often described terms outcrop-based geometric analysis, but microtextural observations are also important, as they relate stress, strain, fluids and temperature thus the rheology peripheral part orogen. Such lacking from Araçuaí orogen Brazil, here investigated through EBSD-based textural analysis quar...

The Proterozoic Carpentaria Province (McArthur basin and Mount Isa Inlier) in northern Australia comprises a number of world class clastic dominated (CD-type) Zn-Pb massive sulphide deposits, formally known as SEDEX deposits. In order to identify the geochemical footprint any mineralizing system it is necessary characterize compositional variability host rock mineralization. southern Carpentari...

The Variscan high-grade metamorphic basement of northern Sardinia and southern Corsica record lower Carboniferous anatexis related to post-collisional decompression the orogen. Migmatites exposed in Punta Bianca locality (Italy) consist quartz + biotite plagioclase K-feldspar orthogneisses, garnet cordierite-bearing diatexite metatexites, derived from metasediments. Field evidence, petrographic...

Collision, high-angle contraction, crustal thickening and heating at 555–516 Ma, primed the Damara Belt ready for collapse, which was triggered by a transition to ENE–WSW contraction along length of belt in response orogenic events east Gondwana 516–505 Ma. Along-orogen shortening reworked thickened high-grade core belt, increasing gravitational instability, establishing an NW–SE extension dire...

Abstract In this contribution, we present new structural, microstructural, fabrics, and geochronological data from the southern Chong Shan complex, one of metamorphic complexes in southeastern Tibetan Plateau that were sheared exhumed during India-Eurasia convergence. The NW-SE–striking complex is comprised a central high-grade zone (Unit I) flanked by two low-grade zones (units II III) on nort...