Corbicula fluminea (Müller 1774) was bred in the laboratory and two shell samples (shell height, A=13 mm, B=9 mm) were selected to determine the carbon isotopic composition of the increment shells (aragonite, CaCO3) and the host water. The results indicate that the carbon isotopic compositions of the two shells increased as the δ^13 C values of the host water increased from -5.24‰ to 1.41‰, showing the influence of δ^13C values on the shell carbon isotopes.δ^13C value ranges from -4.76% to -2.09% and δ^13 C from -8.49% to -2.89%. The δ^13 C values of shells A and B are both more negative than the predicted equilibrium ones, indicating that the shell had used the metabolic CO2 rich in 12C during their growth process.

對雙殼類河蜆進(jìn)行了室內(nèi)養(yǎng)殖黄色网站在线免费。观看，并選取兩個(gè)殼體樣品（殼高国产另类亚洲，A=13 mm一级毛片视频免费高清， B=9 mm）91精品在线观，測定其生長部分殼體和生長期間水體碳同位素黄色三级网，研究表明黄色视频免费区，隨著水體碳同位素的升高（δ^13C由－5.24‰升至1.41‰），兩殼體碳同位素也隨之升高欲香欲色综合网天天涩综合，表明水體對殼體碳同位素的影響九九精品热全在这；δ^13CA分布范圍為－4.76‰~-2.09‰黄色入口，δ^13CB為－8.49‰~-2.89‰，殼體A和B碳同位素均比預(yù)測平衡值偏負(fù)国内免费自拍1视频在线观看网址，表明殼體在形成過程中利用了新陳代謝產(chǎn)生的富集12C的CO2国产高清一区二区亚。

This paper analyzed the carbon isotopic ratios of tw o cryptoMeria, collecting froM West TianMu Mountain, Zhejiang, and studied th e t ree-ring carbon isotopic ratios evidence, for the atMospheric CO2 concentrati on change after Industrial Revolution.

植物在同化大氣CO2過程中產(chǎn)生碳同位素分餾，因此东北女人叫床大片毛片AA，樹輪中穩(wěn)定碳同位素比值（1 3C/12C）不僅是重建古氣候的工具国产成人情侣在线手机观看免费，也是過去大氣CO2濃度變化的敏感指示器。

Based on plentiful isotopic dating data and geological studies, the authors, in this paper, discuss the geological meanings of the two isotopic ages given by Lapierre et al., and conclude:① Mesozoic volcanic activities in Zhejiang are most frequent in 130～83 Ma, that is, from the early to late Cretaceous but not the late Jurassic;② The Jiande and Moshishan groups are nearly in the same period and not in an upper—lower stratigraphic relationship with each other;③ The period of 110～100 Ma is a transitional stage from the early high-K calc-alkaline dacite—rhyolite associated with diorite—granodiorite） to the late basalt—rhyolite（associated with K-feldspar granite—alkali granite）.

本文就Lapierre等文中124 Ma和97 Ma兩個(gè)年齡的地質(zhì)意義性交网址在线观看、幕次劃分以及浙西與浙東火山巖時(shí)代對比作出評論www.Heyoz.com，并厘定浙江中生代火山巖時(shí)代歸屬，提出：①浙江中生代火山活動時(shí)代為132～83 Ma一级a片XX；②浙西建德群與浙東磨石山群火山巖并不存在上下關(guān)系A片一级二级三级，地質(zhì)接觸關(guān)系、古生物組合和大量同位素定年數(shù)據(jù)都不支持Lapierre等的浙西與浙東火山活動幕次的對比方案丝袜美腿足交；③ 110～100 Ma為早期高鉀鈣堿性英安巖—流紋巖（伴生閃長巖—花崗閃長巖）向晚期玄武巖—流紋巖（伴生鉀長花崗巖—堿性花崗巖）過渡的轉(zhuǎn)折期在线观看国产爆草网站。

Based on these, we will measure isotopic composition of boron in biological fossils, such as shell, foraminifer et al. producing from Ynaghu Village, Yanqing Basin, Beijing at early Quaternary and from the sediment of salt lake in Tibetan at Quaternary, and then offer a reliable boron isotopic evidence for determining their source and survival surroundings.

在此基礎(chǔ)上對北京延慶楊戶莊第四紀(jì)早期地層和青藏高原第四紀(jì)鹽湖沉積產(chǎn)出的有孔蟲、貝殼類等生物化石的硼同位素組成進(jìn)行測定日韩视频免费福利片在线，為確定它們的海陸相來源及其生存環(huán)境提供硼同位素證據(jù)欧美一级看片免费观看视频。

The objective of this study is to introduce briefly the basic concept and expression of isotope and the theory of isotopic hydrograph separation,to review the advantages and disadvantages of various hydrograph separation methods which are applied all over the world and to introduce two-component and three-component isotopic hydrograph separation models in details.

簡要介紹了同位素的基本概念、表示方法以及同位素示蹤流量過程線分割的基本原理美国一极黄片。綜述了國內(nèi)外關(guān)于流量過程線分割各種方法的優(yōu)缺點(diǎn)男女晚上啪啪啪黄色网站，并對二水源同位素過程線分割模型和三水源同位素過程線分割模型進(jìn)行了詳細(xì)介紹和推導(dǎo)。

The combination of SEM and SIMS （secondary ion mass spectrometer） is one of the accepted working lines to analyze isotopic compositions of particles. But it required fast searching and accurate locating the interested particles on the sample planchet in SEM and then re-locating the particles and analyzing their isotopic composition in SIMS.

掃描電鏡和二次離子質(zhì)譜儀的聯(lián)用是公認(rèn)的微粒同位素分析技術(shù)路線之一国产欧美AAA√，它需要用掃描電鏡對樣品墊上感興趣的微粒進(jìn)行快速查找和準(zhǔn)確定位国产v日韩免费在线观看，最終用SIMS對同一微粒進(jìn)行再定位和同位素分析。

The Sr Nd Pb isotopic compositions of crust lavas are characterized by higher initial Sr isotopic ratios,lower Nd isotopic ratios,large εNa and enrichment in radiogenic lead.

羅布莎蛇綠巖是雅魯藏布江蛇綠巖帶東段出露較好色爽网站，也是研究程度較高的（蛇綠巖片之一欧美另类激情A片，其殼層熔巖的Sr永久免费精品导航网站，Nd国产h视频网站在线观看，Pb同位素組成具有較高的ISr值，較低的Isd值精品一卡二卡≡卡四卡日产乱码污，大的εNd值和富集放射性成因鉛的特征国产日韩亚洲欧美激情戏。

The characteristic compositions of the stable isotopic and the fluid inclusions in Maoping mineral district show that the main sources of Pb origin the Upper Earths Crust, partly froin orogenetic belt and/or Emeishan basalt; the S isotopic composition hints sulfur sources from the seawater; The D and O isotopic compositions show that they emerge from the compound results of the magma water, metamorphic water, hosted water and rain water; the origination of the C isotopic shows that C resource strata.

脈石礦物D、O同位素組成代表了巖漿水99在线精品、變質(zhì)水黄色a片视频网导航、建造水及大氣降水混合作用的結(jié)果；C同位素組成則反映來自受熱液改造的含有機(jī)質(zhì)的地層一区高清精品视频在线观看，說明地層受成礦流體溶解影音先锋视频资源、淋濾亚洲一级性爱、萃取而提供了部分成礦物質(zhì)和儲礦空間。

Three main methods with lacustrine carbonates have been used to reconstruct the lake water palaeo-temperature at present. First, the technique of isotopic geological thermometer, since being put forward to reconstruct sea-water paleo-temperature, was subsequently introduced into lacustrine carbonate sediments for constructing lake-water based upon the function relationship between lake-water temperature and the oxygen isotopic compositions of lacustrine carbonate and lake-water. Second, paleo-temperature of the lake-water can be reconstructed by determining Mg/Ca values of the lacustrine ostracode shells. And third, paleo-temperature of the lake-water can be reconstructed based upon the statistic model between the oxygen isotopic composition of lacustrine carbonate and the Lake-water temperature by testing the modem hydrogeological parameters and some relevant isotopic data of the lake basin.

目前利用湖泊碳酸鹽對湖泊古水溫進(jìn)行重建主要有三種方式插插插视频，一是運(yùn)用同位素地質(zhì)溫度計(jì)原理亚洲va在线va欧美va，利用水溫與湖泊碳酸鹽氧同位素值和湖水氧同位素值三者之間的函數(shù)關(guān)系，對湖泊古水溫做定量研究在线视频A片；二是通過測定介殼[Mg(上標(biāo) 2+)]/[Ca(上標(biāo) 2+)]進(jìn)而重建古水溫亚洲18一区视频；三是通過測定湖泊流域范圍內(nèi)現(xiàn)代水文氣象參數(shù)及一些相關(guān)的同位素資料直接建立起湖泊自生碳酸鹽氧同位素值與溫度間的統(tǒng)計(jì)模型。

Several main results on the evolutions of the life and environment on early earth are summarized as follows:(1) the oxygenation of surface environment didn''t cease until a stable stage for 0.4Ga appeared after 1.6Ga;(2) compared to the isotopic compositions of kerogens and coexisted carbonates, the differences between two can effectively carrier the signals from local environments and bio-assemblages;(3) multiple isotopic relationships between kerogens and individual alkanes in Proterozoic samples were observed, which would depend on the specific biogeochemical processes;(4) repeated biogeochemical changes were observed accompanying Neoproerozoic glaciations, which suggesting that environmental rather than evolutionary forces were driving the biogeochemical changes;(5) the bio-radiations after Neoproterozoic glaciations were definitely suggested by molecular and isotopic data to be at the early Cambrian and after the middle of Doushantuo deposition with different triggers for them.

研究獲得以下重要認(rèn)識：（1）古元古代地表環(huán)境的氧化可能一直持續(xù)到中元古代早期(約1.6Ga)色色色丝袜，而在此之后的4億年里則保持相對穩(wěn)定国产高清线在线观看不卡视频网站；（2）相對于傳統(tǒng)的干酪根和碳酸鹽的碳同位素組成，二者之差則能更好反映區(qū)域環(huán)境的演化特征日韩午夜精品福利久久；（3）在元古代干酪根與單體烷烴類之間存在多種碳同位素組成關(guān)系亚洲一二三精品；而其與不同的生物地球化學(xué)過程有關(guān)；（4）全球海洋生物地球化學(xué)特征隨新元古代多次冰期出現(xiàn)循環(huán)波動性欧美69式XXXXX，這顯然為環(huán)境因子的驅(qū)動中文自拍日韩在线播放网站视频免费；（5）在新元古代大冰期之后，分子與同位素?cái)?shù)據(jù)顯示地球生命在陡山沱中后期和早前寒武紀(jì)出現(xiàn)兩次大輻射欧美黑人一级精品视频，然而兩次生命輻射的本質(zhì)卻是不同的亚洲国产欧美日韩永久。