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- The geologic dating methods, which include the paleontology method, archeomagnetism method, and isotopic method, present absolute ages or relative ages of geologic events. 前人已建立的地質(zhì)定年方法(同位素法、古生物法和古地磁法)給出的是地質(zhì)事件的“絕對年齡”或“相對年代”。
- Research and application of geological dating and gas hydrate experimental technology II. 地質(zhì)測年與天然氣水合物實(shí)驗技術(shù)研究及應用2。
- The first Sm-Nd synchrone obtained in China with Sm-Nd methods is introduced and Sm-Nd isotopic geological dating in Early Archaean rocks in eastern Hebei has been determined. 適合低含量Sm,Nd的加壓離子交換法。 同時(shí)介紹應用Sm-Nd法得出的我國第一條Sm-Nd等時(shí)線(xiàn),測出了冀東早太古代巖石Sm-Nd同位素地質(zhì)年齡。
- The second dating method was palaeo-magnetic analysis, or magnetic polarity stratigraphy. 第二種測定法是古磁學(xué)分析法，也叫磁極地層學(xué)測定法。
- K Ar and Ar Ar dating is one of the best dating method to Mesozoic Cenozoic volcanic rocks. Appropriate size and preprocessing procedure are important for the method to get good data. K Ar和Ar Ar法是中、新生代火山巖最有效的測年方法之一 ,合適的粒度和有效的預處理程序對于提高年齡資料的質(zhì)量至關(guān)重要。
- The 14C age dating method was applied to study the deposited age of the Jiangbei conglomerate in Youxi profile,Jiangjin. The geochemical characteristics of oxides such as MgO,CaO,Fe2O3,FeO,Fe2O3/FeO were analyzed. 本研究采用14C法對江津油溪剖面江北礫巖膠結年代進(jìn)行測定;用滴定法和原子吸收光譜儀對填隙物的Fe2O3、FeO、CaO、MgO及Fe2O3/FeO變化特征進(jìn)行了分析.
- The longer transportation distance of the fluvial deposits facilitates the bleaching and increases the reliability of the luminescence dating method, especially for the young material. 當然是愈是年輕的標本，較長(cháng)的搬運距離愈是可以增加被曬退的機會(huì )，當然也會(huì )增加螢光定年法的可信度。
- In practice,reaction extrusion is a new trend in the extrusion technology.The multiscrew extruder based on co rotating twin screw extruder is an up to date method. 在實(shí)驗上，反應擠出技術(shù)代表了雙螺桿擠出機開(kāi)發(fā)的趨勢，在此基礎上的多螺桿技術(shù)是該領(lǐng)域的新發(fā)展。
- U-Pb and Pb-Pb dating methods have been used to determine the age of H8 dolomite in Bayan Obo Ore Deposit. 采用U Pb和Pb Pb方法研究了內蒙古白云鄂博賦礦H8白云巖的年代。
- The results of all these dating methods and fossil geochronometry should be contrasted each other. 與蛇綠巖形成、演化相關(guān)的各地質(zhì)事件發(fā)生的時(shí)間可以對蛇綠巖的形成時(shí)代進(jìn)行約束。
- Using radiometric dating methods, Sugden determined that the ash settled into the fissure after a volcanic eruption 8.1 million years ago. 使用放射性斷代法，蘇格丹發(fā)現火山灰早在810萬(wàn)年前的一次火山噴發(fā)后，就已進(jìn)入了裂縫。
- fluorine-uranium-nitrogen-test dating method 氟負氮測年法
- thermoluminescence dating method 熱光測年法
- The high precision dating methods,such as,Re-Os dating of sulphide and ~(40)Ar-~(39)Ar dating of sericites are proposed to date this type of gold deposits. 提出了利用硫化物Re-Os法;熱液絹云母40Ar-39Ar法等直接精確測定熱液礦物年齡以獲得成礦年齡的方法和可能途徑.
- Besides, many of the Date methods have been deprecated in favor of Calendar methods, so you probably want a Calendar object anyway. 此外,為了支持Calendar方法,很多Date方法都已經(jīng)取消了,所以無(wú)論如何,您都很可能需要Calendar對象。
- They've been dating for a long time. 他們一直頻頻約會(huì )。
- Minerals or altered minerals such as sericite, biotite and K feldspar in the altered wallrocks are selected to be objects of age determination, and the Ar Ar, K Ar, Rb Sr, U Pb isochron dating methods are adopted. 選用礦石或蝕變圍巖中的絹云母、黑云母、鉀長(cháng)石等蝕變礦物作為測年對象 ,采用 Ar- Ar、 K- Ar法或 Rb- Sr等時(shí)線(xiàn)法測年在目前的技術(shù)條件下是經(jīng)濟可行的 ,關(guān)鍵是要保證被測礦物確為蝕變礦物并且純度較高。 用 U- Pb法測定礦脈中的水熱鋯石來(lái)確定成礦年齡 ,但如何區分繼承鋯石和水熱鋯石尚不成熟。
- They haven't set a date for their wedding yet. 他們的婚期還沒(méi)定下來(lái)。
- This Greek dish is of a very early date. 這個(gè)希臘盤(pán)子是很早時(shí)期的制品。
- The actual geological examples show that the method is effective. 經(jīng)地質(zhì)學(xué)的實(shí)例計算表明，該方法切實(shí)可行。
