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- W2366234976 abstract "In order to understand the tectonophysic environment of Changning-Menglian tectonic-melange-suture zone, Lincang granite batholith, and Lancangjiang ductile deformation metamorphic zone, which are considered as the partial relict of subducted Paleo-Tethys main body, three-axe high-temperature high-pressure creep deformation experiments were conducted on the rock samples from the Lincang granite batholith near the west side of the zone. The samples formed many kinds of microstructures such as brittle deformation (crack and cataclastic structures), brittle-ductile deformation (granulitic and kink band structures) and ductile deformation (strong undulatory extinction flattened enlongated orientation, mechanical twins, kink bands, asysmetric mineral fabrics and augen structures) with temperature/pressure changing from low to high, but dynamically-recrystallized grains can rarely be found in these samples. The experimental temperature/pressure condition corresponds to that of the middle-lower crust (13 to 18km deep). Dynamically-recrystallized grains developed well in the natural rock samples of Lancangjiang ductile deformation metamorphic zone, indicating that the formation depth should be deeper than that reflected by this experiment. Synthetically considering the thickness (up to 15km) of Lincang granite batholith, the upper limit (8 to 10 km) for granite magma to flow, and the weathering erosion, it may be inferred that the formation depth of the Lincang granite batholith should be 30km, and the original magma may come from the lower of low crust, near the upper Moho plane. The formation and outcropping of the batholith resulted from the eastward subduction of Paleo-Tethys under Lanping-Simao block. The subduction finally caused the collision-suture between the Baoshan and the Lanping-Simao blocks. During the collision, the Lincang granite batholith was eastwards pressured and thrust and formed the Lancangjiang ductile-shear deformation-metamorphic zone, which can reach the top plane of the subduction zone of Paleo-Tethys. All of these indicate that real oceanic subduction had ever taken place in the Changning-Menglian Paleo-Tethys, a large-scale ocean." @default.
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- W2366234976 date "2004-01-01" @default.
- W2366234976 modified "2023-09-26" @default.
- W2366234976 title "HIGH-TEMPERATURE HIGH-PRESSURE EXPERIMENTAL SIMULATION ON GRANITE IN LANCANGJIANG SECTION OF TETHYAN SUTURE ZONE IN SW CHINA" @default.
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