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The elemental geochemical characteristics of Late Quaternary rock core from Yanwo Lake in the Great Wall Station area, King George Island, Southwest Antarctica 下载免费PDF全文
TheelementalgeochemicalcharacteristicsofLateQuaternaryrockcorefromYanwoLakeintheGreatWallStationarea,KingGeorgeIsland,Southwe... 相似文献
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Relatively old ages of chondrites(normally around 4.5Ga)suggest that their parent bodies did not experience any mely-fractionation under high temperature and high pressure conditions pertaining to the interior of terrestrial plaets.Therefore,it is reasonable to take chondrites as starting materials in the study of the chemical evolution of the early earth.The sillicate phase in the Jilin chondrite (H5)was chosen for this purpose because it possesses a chemical composition similar to that of the primitive mantle.The melting experiment was carried out at 20-30 k bar and has rsulted in a product which contains1-5% melts in addition to solid cryustal phase.The chemical composition of the melt phases and the partitioning of various elements between the coexisting silicate melts are geochemically similar to those of anatectic rocks on the earth.This can thus serve as the basis for discussing the chemical evolution of the early upper mantle. 相似文献
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使用武汉(1953-1999年)、宜昌(1958-1999年)两站逐年逐月地面气温观测资料及同期850hPa平均气温资料,分析了两市城市化增温效应的变化趋势。结果表明,近40多年来,武汉、宜昌随城市化进程加快,其年(季)平均气温有增加的趋势,其城市化增温倾向率分别为0.1501℃/lOa和0.1215℃/10a,且不同季节城市化增温倾向率有所不同。 相似文献
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襄樊地区小儿ARI与气象要素的回归分析 总被引:1,自引:0,他引:1
小儿急性呼吸道感染(简称ARI)是一种儿科常见病、多发病,尤其是下呼吸道的急性感染可严重影响小儿身心健康及生长发育,甚至危及生命.多年来很多学者对其流行病学进行了多方面的探讨,发现ARI与气候有一定关系,我国学者对部分地 相似文献
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1 引言 随着时代发展,气候评价与各行各业的联系日渐密切,已成为气象科技服务的重要窗口之一,对经济决策与发展起着重大影响。传统的手工制作气候评价不仅时效差、主观性强,而且很不精确,现有的信息资源也没得到充分利用。为此,我们在原有的工业基础上,建立了一套适合我省的气候评价业务系统。 相似文献
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