The result of factor analysis can provide the changes of relative precipitation and temperature variations. In trace elements, Cu, As, Zn, Pb and Ni were apparently enrichmented in soil layers and are sensitive to climatic changes. Carbon isotope is more sensitive to climatic changes than that of oxygen isotope in loess stratigraphy. The heavy mineral are varified in the loess stratigraphy, but their content differences between loess and palaeosol is little. Though the palynologic analyses results reveal that pollens and spores are fewer in the loess stratigraphy, they differ greatly in loess layer and palaeosol layer not only in species but also in types, i. e., the pollens and spores indicating warm and moist climate, such as Lles, Podocarpus, Polopydium, Pteris grerilliana Wall, Pterocarya and Juglans appear in palaeosol layers, while those indicating cold and dry climate such as Ephedra, Artemisia, Chinopodiaceae, Picea and Abies exist mainly in loess layers. The pollen content of broad-leaved tree mainly consisting of Pterocarya is up to 60% in palaeosol 〓, while the content of Ephedra is more than 50% in 〓 loess layer, showing that the environment differed greatly when 〓 and 〓 were formed.

當(dāng)然，常量元素氧化物的組合因子分析結(jié)果可提供相對降水與相對溫度在剖面的變化一级片免费按摩久久，因而來反映氣候狀況更為理想白白免费发布在线观看；微量元素中Cu、As日韩午夜在线观看短视频网站大全、Zn国产精品手机免费、Pb與Ni在成土過程中富集明顯，亦較好地反映了氣候變化超级毛特级毛一级毛；穩(wěn)定同位素中的碳同位素比氧同位素更能敏感記錄氣候的變化91视频精品网；研究區(qū)黃土地層中重礦物種類較多免费女厕偷拍一级A片，但黃土層與古土壤層中含量差異不大；孢粉分析結(jié)果揭示黄色网站一级二级三级视频，盡管研究區(qū)黃土層中孢粉總量相對較為貧乏91人人操人人爱，但黃土層與古土壤層中孢粉種屬相差較大：在古土壤層內(nèi)出現(xiàn)了指示相對暖濕環(huán)境的冬青屬人成视频在线免费观看观看、羅漢松屬线上激情av网站、水龍骨屬、林下鳳尾蕨狼友网站在线观看入口、楓楊精品一区视频、胡桃等植物孢粉，而黃土層中麻黃国产黄色试看视频、藜科性三级视频久久、蒿屬及冷杉、云杉含量較高99九九久久综合伊人不卡。

The feature of oxygen isotope for magnetite from Abagong iron deposit reflects that the water in the fluid of mineralization resides in the initial magma, implying the magma genesis of mineralization. The similaritary features of REE and trace elements for coexisting apatite with magnetite in the Abagong, the Kiruna type and the Ninwu porphyrite iron deposit show their common genesis, indicating that Abagong iron deposit resulted from the intrusion of late ore magma due to the magma differentiation. The characteristic of sulfur isotope composition implies that the Abagong iron deposit resides in basaltic magma from mantle resource.

阿巴宮鐵礦磁鐵礦氧同位素特征反映了成礦流體中水來源于原始巖漿水黄频污欧美激情，暗示該鐵礦的巖漿成因；與磁鐵礦共生的磷灰石稀土和微量元素特征與Kiruna型鐵礦以及寧蕪玢巖鐵礦中磷灰石特征非常相似日韩精品入口在线观看，表明它們具有相同的成因機理日韩精品青青视频在线观看免费下载，反映出阿巴宮鐵礦為巖漿分異的晚期礦漿貫入式成因；其硫同位素特征表明成礦物質(zhì)源自幔源的玄武質(zhì)巖漿国产精品国产原创国产AV。

Using GC/C/MS on-line carbon isotope analysis technique, we obtained the stable carbon isotope ratios of n-alkanes, iso-alkanes from the light hydrocarbon compositions and pristane, phytane in crude oils in Tarim basin.

本文利用新興的原油單體烴類在線同位素分析技術(shù)測定了塔里木盆地原油及凝析油的正構(gòu)烷烴欧美三级视频播放在线观看网址、輕烴部分的異構(gòu)烷烴和植烷、姥鮫烷的穩(wěn)定碳同位素值日韩手机黄色视频。

Distinguish by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions.

用放射性同位素或不尋常質(zhì)量的同位素使元素或原子顯示運動蹤跡一级A片欧美久久一级香蕉片。

The calculated results show that the CaI vibrational population peaks moved to low value.The calculated cross-section changed slightness duo to isotope effect. The angle product distributions tend to backward scattering also and isotope effect is not observably. Thecalculated

由于同位素效應(yīng)的影響，產(chǎn)物Cal的振動態(tài)分布向低振動態(tài)轉(zhuǎn)移国产馆在线精品极品麻豆；反應(yīng)體系的散射截面在低碰撞能和高碰撞能處有些微變化午夜日韩欧美；受到反應(yīng)物質(zhì)量因子變化的影響，轉(zhuǎn)動取向值減少毛毛看毛片，產(chǎn)物轉(zhuǎn)達取向強烈欧亚性爱网；產(chǎn)物的角分布同位素效應(yīng)不明顯。

The current study and C and O isotope evolution are consistent with the previous research results, which provides isotopic evidence supporting the existence of an aulacogen basin alone, and furthermore are highly concordant with the C and O isotope evolutions in Belt Supergroup in North America and MidRiphean in Ural, Russia, which suggests a response to a global paleoocean geochemical setting.

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E. , the middle Devonian sedimentary event, which sedimented a suite of epicontinental -coasta1 paraf1ysch formation (the litholcgy was consisted of low fractoin feldspare sandstone and siltstone, and a layer of argilliferous limestone); secondly, the late Variscan magmatic-tectonic event , three biotite diorite batholiths ( previous K-Ar model isotope age was about 220～260Ma and our two -stage common lead isotope age was 260+ 70Ma) and a large number of fracture-controlled quartz diorite veins intrude, and a series of NS distributed tightly complex folds and fractures were developed; thirdly, the late Paleozoic very 1ow grade metamorphism- deformation event, the chlorite-illite crystallinity indices (Δ°2θ) XRD measurements were about 0.25～0.29, which was correlated to the lower part of the anchimetamorphism, and the extremely dense schists were developed throughout the district outcrops

相當(dāng)于近變質(zhì)帶的下部，并形成切穿礦區(qū)幾乎所有主要地質(zhì)體的竊集片理色小说亚洲色图，這與有限相系淺變質(zhì)碎屑巖的基本宏觀地質(zhì)特征相吻合

The study indicates that the Pb and Zn ore-forming elements probably come from the basement rocks; The initial Pb isotope could be derived from the crust-mantle mixing in the erogenic belt; sulfur isotope composition is enriched in heavy sulfur that may have come from the seawater sulfate in the synchronous sedimentation; the ore is characterized with REE enrichment, obvious fractionation of LREE and flat-pattern of HREE; ore-forming media is thermal brine fluid; both mineralization temperature and pressure are low; the metallogenic epoch is probably in late Dengying epoch of Sinian period.

研究表明国产精品愉拍在线看小宝，基底巖系可能為成礦元素Pb、Zn的主要來源美女A片一级a_级a毛片；原始鉛主要來源于殼幔棍合的造山帶亚洲欧洲久久av；硫同位素富集重硫，可能主要來源海水硫酸鹽毛级黄片视频XXXX；礦石中稀土元素富集亚洲欧美综合精品二区，輕稀土分異較明顯，而重稀土分異不明顯国产青榴视频网；成礦流體推測為熱鹵水性質(zhì)精品一区二区无码视频，成礦溫度為中低溫，具有低壓淺成成礦特點野外性XXⅩXX大少妇；礦床形成的初期應(yīng)始于震旦紀燈影世晚期激情图片激情小说激情视频。

There was enrichment of the heavier isotope of mesoplankton with increasing grain size, showing carbon isotope enrichment along trophic levels.

中型浮游動物隨粒徑的增大，其δ13C值增大亚洲A∨无码乱码在线观着性色，顯示出營養(yǎng)層次的碳同位素富集作用视色网、视色视频，但不同粒級組分相互間δ13C值也存在著相當(dāng)程度的重疊，實際上這也是其生物組分有重疊的反映一区二区免费视频在线观看。

Three hypotheses is put forward, based on microexamination about sample evaporation during determaination of isotope abundance by thermal ionization:1. Only atoms uncovered by outer layer atoms can be vapoured; 2. Atoms covered by outer layer atoms can diffuse but cannot vapoure; 3. The probability of diffusion of isotope atoms is in direct proportion to its probability of evaporation.

根據(jù)對熱表面電離源同位素豐度測量過程中樣品蒸發(fā)的微觀研究国产精品一区二区视频，提出如下三條假設(shè)：(1 )未被外層原子覆蓋的原子才能蒸發(fā)；(2 )被外層原子覆蓋的原子只能擴散不能蒸發(fā)日韩精品免费人成视频观看；(3 )同位素原子的擴散幾率與蒸發(fā)幾率成正比免费看黄片链接。