简介:Thispaperreportssiliconandoxygenisotopesof20kindsofigneousrocksandtheirmajorelementsfromtheeasternManusBasin.Combiningsiliconandoxygenisotopicdatafromotherstudies,wesupposethatbothδ30Siandδ18OvaluesincreasewiththeincreasingofSiO2content.Itmeansthatthefractionationofsiliconandoxygenisotopesareaffectedbythesilicacontent.ThepositivecorrelationbetweenCaO/Al2O3ratiosandMgOandthatbetweenSi/AlandSiO2contentindicatethatclinopyroxeneisthepredominantmineralphaseinoursamples.Wesupposethatthefractionationofsiliconandoxygenisotopesareinfluencedbymineralfractionalcrystallization.Probably,itisduetotheirdifferentsiliconandoxygenbridges.Inthisstudy,theδ30Simeanvalue=-0.17‰±0.17‰andδ18Omeanvalue=+6.07‰±0.57‰arehigherthannormalδ30Siandδ18Ovaluesofmantle,andweproposethattheseigneousrocksintheeasternManusBasinareaffectedbyhydrothermalalteration.
简介:Withprocessingandinterpretationof25000kmfull-coveragemultibeamswathdatafromtheeasternSouthChinaSea,itisfoundthatNE-trendingandNW-trendinglinearmorphologicalfeaturessuchasscarps,horstsandgrabens,govemthecentralpart(14°~17°N)ofeasternsubbasin.Comparedwithreflectionseismicprofiles,theseNE-trendinglinearmorpho-structuresareconsideredtobetherepresentationofbasementstructuresonseabedandcanbedividedintothreelinearstructuralzones.ThetrendofthecentralzoneisNE45°~50°occurringaroundextinctspreadingcenter,thetrendofthesecondzoneisNE70°~78°onbothsidesofthecentraloneandthetrendofthethirdzoneisaboutNE60°justonthenorthofthesecondone.ThesethreeNE-trendinglinearzonesareformedinlate-stageNW-SE-trendingseafloorspreadingoftheeasternsubbasinalongNW-trendinglinearfaults,andrespectivelycorrespondtothreespreadingepisodes:17.0~19.0Ma(5d-5e),19.0~21.0Ma(5e-6a)and21.0~24.2Ma(6a-6c)basedonthecontrastofmorpho-structurestomagneticlineationanomalies.
简介:全部的水银(THg)和甲基水银(MeHg)的集中为沿着福建省和东方广东省的沿海的线收集的32表面沉积被决定。THg和MeHg和他们的环境影响因素的空间分布被调查。在沉积的THg和MeHg的平均集中分别地是31.5ng/g和0.096ng/g。沉积THg和MeHg集中在Minjiang河口和Quanzhou和Putian的沿海的区域显示出相对高的价值。当到海岸线的距离增加了,集中总的来说减少了。在环境影响因素和THg之中的关联,MeHg被分析。沉积THg集中高度被相关到有机物,铜,全部的氮(TN)和全部的磷(TP)的集中,并且显著地相关到底部海水的pH价值和沉积硫化物的集中。沉积MeHg集中高度被相关到有机物和铜的集中,并且重要相关到硫化物,TN,TP和底部海水的pH价值的集中。
简介:对中间的熔岩的起源有许多最近的兴趣,几个假设是:1)在浸透水的条件下面的披风的直接融化,2)改变的外壳的部分融化,3)父母岩浆的部分结晶化,并且4)岩浆与dacitic/rhyolitic岩浆混合mafic岩浆。暴烈摇系列从东方手盆从玄武岩的安山岩到dacite(从53.8~63.0wt.%的SiO2范围)被检测为主修并且跟踪元素作文理解他们的起源。低H2O内容,2和Yb-SiO2,氧同位素数据和在斜长石斑晶的摆动的zoning的踪迹元素集中的模糊变化排除的La-SiO的积极关联硅的熔岩从含水的披风的直接融化导致的模型,改变的海洋的外壳或斑粝岩的部分融化,并且分别地混合的岩浆。除以外,geochemical数据完全摇并且融化包括显示部分结晶化在产生中介起一个主导的作用有subduction特征的熔岩。
简介:在13:46在2011年3月11日(北京时间),Mw=9.0的地震发生在日本。由从Guanhekou比较海啸数据,有另外的海啸波浪观察的海洋的车站从东南收集了中国的沿海的区域,仅仅在Guanhekou,最大的波浪高度的位置出现在中间的部分而非在海啸波浪火车的前面,是明显的。海啸繁殖的一个数字模型基于2-D,非线性的浅水方程被造学习影响范围和在江苏发现的特殊海啸波形的主要原因沿海的区域。结果将近显示出那江苏沿海的区域的three-quarters,主要光线的沙山脉向北包括了部分,在波浪火车的中间的部分到达了它的最大的海啸波浪高度。特殊波形的主要原因是专辑在水下地形学黄海和华东海区域调节,它显著地影响了海啸繁殖和波形。尽管陆地边界思考在最大值的位置上带了效果,挥动高度到某个程度,作为在观察点和岸之间的事件波形和距离的限制,它不是特殊波形的主导的影响因素。海啸波浪上的Coriolis力量影响是那么弱的它不是为在江苏沿海的区域的特殊现象的主要原因。学习提醒我们最破坏的波浪可能不在海啸波浪火车出现在第一个。
简介:AWRF-Chemmodelincludingacomprehensivegas-phasenitrogenchemistrymodulewasusedtosimulateaseveredusteventappearingintheeasternChinaon19-25March,2002.ThemodelingresultwellreproducedPM10concentrationsinvariousdistancesfromthedustsourcesandthetransportpathwayoftheduststrom.TheresultsshowedthatboththeconcentrationsandthedrydepositionfluxesofPM10increasedovertheChinaseasduringthedusteventfollowingthepassageofacoldfrontsystem.ThemaximumfluxesofPM10intheYellowSeaandtheEastChinaSeaduringthedusteventwere5.5and8.4timesofthosebeforetheevent,respectively.However,thetemporalvariationsofthedrydepositionfluxesofparticulateinorganicnitrogendifferedovertheYellowSeafromthoseovertheEastChinaSea.NitrateandammoniuminthewholenorthernChinarapidlydecreasedbecauseoftheintrusionofdust-loadedairon19March.ThedustplumearrivedintheYellowSeaon20March,decreasingtheparticulateinorganicnitrogeninmassconcentrationaccordingly.TheminimumdrydepositionfluxesofnitrateandammoniumintheYellowSeawereabout3/5and1/6ofthosebeforethedustarrival,respectively.Incontrast,whenthedustplumecrossedovertheYangtzeDeltaarea,itbecameabundantinnitrateandammoniumandincreasedtheconcentrationsanddrydepositionfluxesofparticulateinorganicnitrogenovertheEastChinaSea,wherethemaximumdrydepositionfluxesofnitrateandammoniumincreasedapproximatelyby4.1and2.6timesofthosepriortothedustarrival.