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- W2093554941 abstract "We present a new crustal cross section through the east‐west trending ultrahigh‐pressure (UHP) Dabie Shan orogenic belt, east central China, based on a 400‐km‐long seismic refraction profile. Data from our profile reveal that the cratonal blocks north and south of the orogen are composed of 35‐km‐thick crust consisting of three layers (upper, middle, and lower crust) with average seismic velocities of 6.0±0.2 km/s, 6.5±0.1 km/s, and 6.8±0.1 km/s. The crust reaches a maximum thickness of 41.5 km beneath the northern margin of the orogen, and thus the present‐day root beneath the orogen is only 6.5 km thick. The upper mantle velocity is 8.0±0.1 km/s. Modeling of shear wave data indicate that Poisson's ratio increases from 0.24±0.02 in the upper crust to 0.27±0.03 in the lower crust. This result is consistent with a dominantly felsic upper crustal composition and a mafic lower crustal composition within the amphibolite or granulite metamorphic facies. Our seismic model indicates that eclogite, which is abundant in surface exposures within the orogen, is not a volumetrically significant component in the middle or lower crust. Much of the Triassic structure associated with the formation of the UHP rocks of the Dabie Shan has been obscured by post‐Triassic igneous activity, extension and large‐offset strike‐slip faulting. Nevertheless, we can identify a high‐velocity (6.3 km/s) zone in the upper (<5 km depth) crustal core of the orogen which we interpret as a zone of ultrahigh‐pressure rocks, a north dipping suture, and an apparent Moho offset that marks a likely active strike‐slip fault." @default.
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- W2093554941 date "2000-05-10" @default.
- W2093554941 modified "2023-10-17" @default.
- W2093554941 title "A crustal model of the ultrahigh‐pressure Dabie Shan orogenic belt, China, derived from deep seismic refraction profiling" @default.
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- W2093554941 doi "https://doi.org/10.1029/1999jb900415" @default.
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