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Rheological Properties of Mantle Peridotites at Yushigou in the North Qilian Mountains and Their Implicationsfor Plate Dynamics

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Acta Geologica Sinica(English Edition) 1998年第2期72卷 131-141,242页

作者： SONG Shuguang SU Li Xi'an Institute of Geology and Mineral Resources CAGS166 East Youyi Rd.Xi'anShaanxi 710054

Abstract: This paper discusses in detail the deformation textures, glide system, petrofabrics and olivine dislocation microstructures of mantle peridotites at Yushigou in the North Qilian Mountains, northwestern China. The peridotites have undergone high-pressure, high-temperature and low-strain rate plastic flow deformation. According to the dynamic recrystallized-grain size of olivine and the average spacing between the dislocation walls as well as the chemical composition of enstatite, the authors calculated the rheological parameters of the ancient upper mantle in the study area as follows: temperatures 1025–1093°C; pressures 3043–4278 MPa; depths 95–132 km; deviatoric stress 28–32 MPa; strain rates 0.2×10?14-2.13×10?14s?1 and equivalent viscosities 0.45×1020-4.65×1020 Pa ? s. These parameters suggest that the position where plastic flow took place was correspondent to the lowvelocity zone beneath the oceanic lithosphere and that oceanization characterized by middle-velocity (1–3 cm/a) sea-floor spreading took place in the North Qilian Mountains during the Early Palaeozoic.

关键词： oceanic mantle rocks rheology sea-floor spreading North Qilian Mountains

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Seismic facies response of tectonics and direction of block movement in the northeastern South China sea

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Applied Geophysics 2010年第4期7卷 306-314,399页

作者：陈洁钟广见刘少华广州海洋地质调查局广州510760 中科院地质地球物理所北京100029

The close relationship between the structure,evolution,and resources environment of the South China sea is a current research focus and also a focal point of our *** this paper,we use regional seismic sections to analyze the relationship between seismic facies and the structure and tectonic evolution of the northeastern South China sea and propose new points about the structure and the direction of block（land mass） ***,the tectonic features are clear and can be divided into five different structural units which are both linked and independent of each ***,it doesn＇t matter if the South China sea basin pattern is extensional,weakly compressive,or strongly compressive,the regional tectonic stress field is *** the first time we find that two shallow subduction zones are recognized in the seismic *** the tectonic blocks have accordion-fold-style structures,converging in the east,and the South China sea exhibits different stages of basin development：growth, maturity,end,and *** block subduction and regional block dip directions are all aligned with the regional stress field.

关键词： sea-floor spreading SCS shallow subduction one way drifting extrusion metamorphism accordion-style seismic facies

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