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- W1981128596 abstract "New structural and metamorphic data from the Chogo Lungma glacier area and Basha valley enlighten the polyphased tectonometamorphic evolution of the Metamorphic Complex of Karakorum. A pre- to early D1 event is defined by a metamorphic cleavage in the core of some zoned garnet and staurolite porphyroblasts. The main tectonometamorphic event (D1) is characterized by N110°E south-vergent isoclinal folds associated with a metamorphic axial-plane cleavage formed in a predominantly flattening regime of deformation. It corresponds to a Grt-Bt-Mu-Ky peak metamorphism (M1: 620–730°C and 7.5–11 kbar). The D2 tectonometamorphic event corresponds to the development of several conical domes elongated striking N110°E to N140°E. The S2 cleavage is seldom individualized as it usually corresponds to a reworking of S1. In some areas, late evolution of D2 doming deformation is marked by a crenulation. Petrologically, D2 is characterized by shearing and boudinage of M1 minerals and by development of sillimanite. It corresponds to a decompressional evolution (7.5 down to 4 kbar) with only slight changes in temperature. A late event corresponds to large undulations and open folds which affect the D2 crenulation. We propose here a model of vertical plus dextral extrusion of the middle crust to explain the dome structures in Karakorum. The steep pattern of the metamorphic P-T path implies rapid exhumation rates and suggests that the different phases could be part of a continuum of deformation. Preliminary results by 40Ar39Ar method give young cooling ages (<10 Ma) for the D2 event (Villa et al., 1996, this issue). Thus, most of the observed tectonometamorphic evolution in central Karakorum could be fairly young." @default.
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- W1981128596 date "1996-07-01" @default.
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- W1981128596 title "Tectonometamorphic evolution of the central Karakorum (Baltistan, northern Pakistan)" @default.
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- W1981128596 doi "https://doi.org/10.1016/0040-1951(96)00080-7" @default.
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