简介：通过对博格达东部下涝坝地区的辉绿岩进行研究,发现该区辉绿岩具富铝、高演化（FM和FL值都较高）、经过壳幔混合或改造（高烧失量）、Y/Ho、Zr/Hf和Nb/Ta的比值显示出非球粒陨石的特点。首次在该区发现了辉绿岩的稀土元素具四分组效应,通过对辉绿岩稀土四分组效应的程度进行量化,发现本区的辉绿岩稀土元素具明显的＂MM＂型四分组效应,且TE1、3TE1、3、4均大于1.1,表明稀土元素＂M＂型效应非常明显。认为该地区辉绿岩稀土元素的＂MM＂型四分组效应是由于辉绿岩的高演化、受到高铝质的地壳改造,及后期挥发分和流体的改造等因素造成。

简介：Unusualcarbonaceousmatter,termedherechiemite,composedofmorethan90%CfromtheAlpineForelandatLakeChiemseeinBavaria,southeasternGermanyhasbeeninvestigatedusingopticalandatomicforcemicroscopy,X-rayfluorescencespectroscopy,scanningandtransmissionelectronmicroscopy,high-resolutionRamanspectroscopy,X-raydiffractionanddifferentialthermalanalysis,aswellasbyδ13Cand14Cradiocarbonisotopicdataanalysis.Inthepumice-likefragments,poorlyorderedcarbonmatterco-existswithhigh-orderingmonocrystallineα-carbyne,andcontainssubmicrometer-sizedinclusionsofcomplexcomposition.Diamondandcarbyneaddtothepeculiarmixofmatter.TherequiredveryhightemperaturesandpressuresforcarbyneformationpointtoashockeventprobablyfromtherecentlyproposedHoloceneChiemgaumeteoriteimpact.Thecarbonmaterialissuggestedtohavelargelyformedfromheavilyshockedcoal,vegetationlikewood,andpeatfromtheimpacttargetarea.Thecarbonization/coalificationhighPTprocessmaybeattributedtoastrongshockthatinstantaneouslycausedthecompleteevaporationandlossofvolatilematterandwater,whichneverthelesspreservedtheoriginalcellularstructureseenfossilizedinmanyfragments.Relativelyfreshwoodencapsulatedinthepurportedstronglyshockedmatterpointtoquenchedcarbonmeltcomponentspossiblyimportantforthediscussionofsurvivaloforganicmatterinmeteoriteimpacts,implyinganastrobiologicalrelationship.

简介：IfoundhighQvalues(Q-ratio=Jn/Ji,Jn,Jiareremanentmagnetizationandinducedmagnetization)intheSuluultrahighpressure(UHP)metamorphicrocks,easternChinawhichistheworld’slargestUHP

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简介：<正>1IntroductionVirusesarethemostabundantbiologicalentitiesonEarth.Theycaninfluencethesuccessionofindividualmicrobialpopulations,biogeochemicalcyclesofC/Nand,ultimately,microbialcommunitystructurethroughkilling

简介：为了给五沟煤矿第四含水层下正常开采及提高回采上限提供科学的水文地质依据，根据伸直法原理，在建立参数模型和曲线模型的基础上，判别出1016-1孔第四含水层抽水试验Q-S曲线类型，建立了抛物线方程，换算出井径为91mm、10m降深时的q值，精准地评价了第四含水层富水性，消除了野外施工中机械设备、降深等一些因素对抽水试验获取参数的影响。