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Field work conducted in September 1998 and Summer 1999 aimed to reassess the ophiolitic segment of the Yarlung Zangbo suture zone (YZS) and shed new light on the preserved fragments of Neo\|Tethys ocean\|floor. This eastern ophiolitic segment was partly surveyed during the 1980 Sino\|French Cooperative Investigation of Himalayas, but little work has been done since that time. Progress in ophiolite research field and new developments in modern ocean crust guided us in the recent field work investigation. Mantle peridotites and associated minor crustal units are assumed Early Cretaceous in age, while diabase interbedded with phyllites and radiolarian sediments of presumed seamount origin are attributed to Late Jurassic—Early Cretaceous age. Six different massifs were visited that are from west to east: Jiding, Qunrang, Beimarang, Dazhuqu, Luobusa, and Zedang. Each massif presents specific characteristics summarized below. The Jiding massif is made of partly to totally serpentinized granular upper mantle harzburgites with orthopyroxenite banding, a transitional Moho zone, a thick diabase sill\|dike complex intruded into heterogeneous gabbro, and pillow lavas.. High\|temperature plastic foliation, although generally oriented NW—SE, and lineation show folding. Numerous gabbroic and diabasic intrusions are observed in peridotites. The orientations of the mafic rocks foliation and lineation do not fit the structure of the host peridotites. The 350m thick transition zone is a syntectonically intrusive sequence of mantle peridotites cut by abundant different types of gabbro and diabase. In one case intrusion of gabbro postdates serpentinization of peridotites and the outer margin of the xenolith enclosed in fine\|grained gabbro has reacted to form pegmatitic hornblende gabbro. The crustal unit is made of gabbro intruded by multiple fine\|grained dikes. Hydrothermal circulation was locally intense and Cu mineralization and epidosite are observed close to shear *** Qunra

关键词： Yarlung Zangbo Xigaze ophiolites mineral chemistry mantle heterogeneities

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Recent advances in germanium emission[Invited]

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Photonics Research 2013年第3期1卷 102-109页

作者： P.Boucaud M.El Kurdi A.Ghrib M.Prost M.de Kersauson S.Sauvage F.Aniel X.Checoury G.beaudoin L.Largeau I.Sagnes G.Ndong M.Chaigneau R.Ossikovski Institut d’Electronique Fondamentale CNRS-Univ.Paris Sud 11Bâtiment 220F-91405 OrsayFrance STMicroelectronics 850 rue Jean Monnet38920 CrollesFrance Laboratoire de Photonique et de Nanostructures CNRS-UPR 20Route de Nozay 91460 MarcoussisFrance Laboratoire de Physique des Interfaces et des Couches Minces CNRS-Ecole polytechniqueF-91128 PalaiseauFrance

The optical properties of germanium can be tailored by combining strain engineering and n-type *** this paper,we review the recent progress that has been reported in the study of germanium light emitters for silicon *** discuss the different approaches that were implemented for strain engineering and the issues associated with n-type *** show that compact germanium emitters can be obtained by processing germanium into tensile-strained microdisks.

关键词： emitter doping strained

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