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Recycled crustal melt injection into lithospheric mantle:implication from cumulative composite and pyroxenite xenoliths

Recycled crustal melt injection into lithospheric mantle:imp...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Hong-Fu Zhang·eizo nakamura·Katsura Kobayashi·Ji-Feng Ying·Yan-Jie Tang State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9825,100029 Beijing,China

A rare composite xenolith and abundant cumulative pyroxenites obtained from the Mesozoic Fan-gcheng basalts on the eastern North China Craton record a complex history of melt percolation and circulation in the subcontinental lithospheric *** composite xenolith has a dunite core and an olivine clinopyroxenite *** dunite is of cumulative origin and has a granular recrys-tallized texture and extremely low Mg#[100 Mg/ (Mg+Fe)=81-82]contents in *** olivine clinopyroxenite contains larger clinopyroxene and/or orthopyroxene with a few fine-grained olivine and tiny phlogopite,feldspar,and/or carbonate minerals interstitial to *** clinopyroxene has low Mg#(83-85). Compositional similarity between dunitic olivine and pyroxenitic one indicates a sequential crystallization of dunite and pyroxenite from a precursor *** xenoliths include olivine websterites and clinopyroxenites, both are of cumulative *** of the melt from major oxides in olivines and REE concentrations in clin-opyroxenes in these composite and pyroxenite xenoliths suggests a derivation from subducted crustal materials, consistent with the highly enriched EMII-like Sr and Nd isotopic ratios observed in the *** of phlogopite,feldspar and carbonate minerals in some xenoliths requires the melt rich in alkalis(K,Na),silica and volatiles(water and CO)at the latest stage as well,similar to highly silicic and potassic ***,the occurrence of these composite and pyroxenite xenoliths provides an evidence for voluminous injection of recycled crustal melts into the lithosphere beneath the southeastern North China Craton at the Late Mesozoic,a reason for the rapid litho-spheric enrichment in both elemental and isotopic compositions.

关键词： Composite and pyroxenite xenoliths Cumulates Recycled crustal melt Lithospheric mantle North China Craton

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Which of the calibration methods without or with ambient lighting should we choose?

Which of the calibration methods without or with ambient lig...

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2010中华医学会影像技术分会第十八次全国学术大会

作者： Michinobu Matsuyama Keita Takahashi Hiroshi Akamine Nobukazu Tanaka Yasuhiko nakamura Noriyuki Hashimoto Junji Morishita Department of Health Sciences Graduate School of Medical SciencesKyusyu UniversityFukuokaJapan Kyusyu University Hospital FukuokaJapan Department of Health Sciences Faculty of Medical SciencesKyusyu UniversityFukuokaJapan eizo Nanao Corporation IshikawaJapan

Objective:The purpose of this study was to investigate the optimal calibration method to the grayscale standard display function(GSDF) for medical-grade liquid-crystal display (LCD) monitors by comparing the effect of ambient lighting on the GSDF between different calibration methods(*** and with ambient lighting).

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