Impact of Hellenic Arc Tsunamis on Corsica (France)     

Audrey Gailler  F. Schindelé  H. Hébert 《Pure and Applied Geophysics》2016,173(12):3847-3862

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Mineral and fluid thermobarometry within the Variscan shearzone of Monteferro-El Rosal (NW Galicia, Spain): a preliminary investigation     

Ronan Hébert 《地学学报》1997,9(1):24-27

The Monteferro El Rosal shear zone is characterized by an intense ductile deformation produced during the third phase of the Variscan orogeny. The petrology of the metasediments and the study of the fluid inclusions from synkinematic andalusite-bearing quartz veins indicate that the major Variscan phase of deformation occurred at around 2. 5–4 kbar and 565 ± 25°C.  相似文献   

Detection of atmospheric Cherenkov radiation using solar heliostat mirrors     

A. Ong R.  D. Bhattacharya  C. E. Covault  D. D. Dixon  D. T. Gregorich  D. S. Hanna  S. Oser  J. Qu  bert  D. A. Smith  O. T. Tü  mer  A. D. Zych 《Astroparticle Physics》1996,5(3-4):353-365

There is considerable interest world-wide in developing large area atmospheric Cherenkov detectors for ground-based gamma-ray astronomy. This interest stems, in large part, from the fact that the gamma-ray energy region between 20 and 250 GeV is unexplored by any experiment. Atmospheric Cherenkov detectors offer a possible way to explore this region, but large photon collection areas are needed to achieve low energy thresholds. We are developing an experiment using the heliostat mirrors of a solar power plant as the primary collecting element. As part of this development, we built a detector using four heliostat mirrors, a secondary Fresnel lens, and a fast photon detection system. In November 1994, we used this detector to record atmospheric Cherenkov radiation produced by cosmic ray particles showering in the atmosphere. The detected rate of cosmic ray events was consistent with an energy threshold near 1 TeV. The data presented here represent the first detection of atmospheric Cherenkov radiation using solar heliostats viewed from a central tower.  相似文献   

Metamorphic history and geodynamic significance of high-grade metabasites from the ophiolitic mélange beneath the Yarlung Zangbo ophiolites, Xigaze area, Tibet     

Carl Guilmette  Rejean Hbert  Cline Dupuis  Chengshan Wang  Zhongjian Li 《Journal of Asian Earth Sciences》2008,32(5-6):423-437

Blocks of highly foliated amphibolite are locally embedded within a serpentinite mélange underlying the Yarlung Zangbo ophiolites in the Xigaze area of southern Tibet. The ophiolites are remnants of an Early Cretaceous back-arc basin within the Permo-Cretaceous Tethys Ocean, which are exposed along in the Yarlung Zangbo Suture Zone (YZSZ). These amphibolites are interpreted as fragments of a dismembered dynamothermal sole. Three types of amphibolite are present: (1) common amphibolite with assemblages of Hbl + Pl ± Ep ± Ap ± Ttn, (2) clinopyroxene-bearing amphibolite with Hbl ± Pl ± Cpx ± Ep ± Ttn ± Qtz ± Ap and (3) garnet–clinopyroxene-bearing amphibolite characterized by the assemblages Hbl + Cpx + Grt + Pl ± Rt and Grt + Hbl + Pl (corona assemblage). In all three types, plagioclase is pseudomorphed by late albite–prehnite. Retrograde cataclastic veins containing assemblages of Prh + Ab + Ep ± Chl are also present. P–T estimates indicate that the amphibolites reached peak metamorphic conditions of 13–15 kbar and 750–875 °C. Partial replacement of pyrope-rich (up to 35 mole%) garnet by Al-tschermakite (Al₂O₃ up to 21 wt%) reflects a high pressure (≈18 kbar, 600 °C) metamorphic event followed by rapid exhumation. Soon after exhumation, the amphibolites were intruded by very fine-grained diabase dykes that were then hydrothermally altered. The field relationships and metamorphic history of the amphibolites indicate formation during inception of subduction within a back-arc basin prior to obduction of the ophiolites onto the Indian passive margin.  相似文献