【摘要】：Re-Os同位素體系是理解月球強親鐵元素的分布規(guī)律和示蹤月球的后期增生歷史的重要手段。目前人們對月球物質(zhì)Re-Os同位素成分的了解還是十分有限的,已有的Re-Os同位素數(shù)據(jù)顯示一些能代表月幔成分特征的月海玄武巖具有很低的Re和Os的濃度,以及類似于球粒隕石的187Os/188Os成分特征,而月球火山玻璃和月壤等表現(xiàn)出相對高的Re、Os豐度和相對富放射成因Re-Os同位素成分。一般認(rèn)為月球月幔的Re、Os和其他強親鐵元素相對球粒隕石是非常虧損的,而地球地幔則具有相對較高的強親鐵元素豐度(0.008倍CI球粒隕石的豐度)。新的Re-Os同位素結(jié)果證明月幔確實是虧損的,但是月球和地球在太陽系演化的較晚時期都有外來的球粒隕石物質(zhì)的大量加入,即后期增生(late accretion)過程,導(dǎo)致了月球和地球上部物質(zhì)(如月球火山玻璃、月壤等)相對地富集Os同位素和強親鐵元素,這些外來物質(zhì)的后期增生可能是長期和持續(xù)的,增生過程主要發(fā)生在3.9～4.4Ga。但目前仍不清楚后期增生的隕石物質(zhì)是被逐漸加入的,還是在一個相對較短的時期大量加入的,因此尚需對更多的月球物質(zhì)做進一步的Re-Os同位素和強親鐵元素成分的研究。
[Abstract]:The Re-Os isotopic system is an important means to understand the distribution of the strong ferriphilic elements and trace the late proliferative history of the moon. At present, people's understanding of the Re-Os isotopic composition of lunar material is still very limited. The available Re-Os isotopic data show that some lunar basalts, which can represent the characteristics of the lunar mantle composition, have very low Re and Os concentrations. The characteristics of 187Os/188Os compositions are similar to chondrites, while the lunar volcanic glass and lunar soil show relatively high Re,Os abundance and relatively rich radiogenic Re-Os isotopic compositions. It is generally considered that the Re,Os and other strong iron elements in the lunar mantle are very depleted relative to chondrites, while the mantle of the earth has a relatively high abundance of strong ferriphilic elements (0.008 times the abundance of CI chondrites). The new Re-Os isotope results prove that the mantle is indeed depleted, but both the moon and the earth have a large addition of chondrites in the late solar system, that is, the late accretive (late accretion) process. This has led to the relative enrichment of Os isotopes and strong iron elements in the lunar and upper parts of the Earth (such as lunar volcanic glass, lunar soil, etc.), and the late accumulation of these foreign substances may be long-term and persistent. The proliferative process mainly occurred in 3.9L 4.4Ga. However, it is still unclear whether the late accretionary meteorites were gradually added or were added in large quantities in a relatively short period of time, so further studies on Re-Os isotopes and strong iron-friendly elements are needed for more lunar matter.
【作者單位】： 中國科學(xué)院廣州地球化學(xué)研究所;
【基金】：國家自然科學(xué)基金(40873054,40930316)
【分類號】：P184

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