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Rb‐Sr resonance ionization geochronology of the Duluth Gabbro: A proof of concept for in situ dating on the Moon

机译:Duluth Gabbro的Rb-Sr共振电离地球年代学:月球上原位测年的概念证明

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摘要

RationaleWe report new 87Rb‐87Sr isochron data for the Duluth Gabbro, obtained with a laser ablation resonance ionization mass spectrometer that is a prototype spaceflight instrument. The gabbro has a Rb abundance and a range of Rb/Sr ratios that are similar to those of KREEP‐rich basalts found on the nearside of the Moon. Dating of previously un‐sampled young lunar basalts, which generally have a KREEP‐rich composition, is critical for understanding the bombardment history of the Moon since 3.5 Ga, which in turn informs the chronology of the solar system. Measurements of lunar analogs like the Duluth Gabbro are a proof of concept for in situ dating of rocks on the Moon to constrain lunar history.
机译:原理我们报告了Duluth Gabbro的新 87 Rb- 87 Sr等时数据,该数据是使用作为原型航天飞机的激光烧蚀共振电离质谱仪获得的。辉长岩的Rb丰度和Rb / Sr比率范围与月球附近发现的富含KREEP的玄武岩相似。以前未采样的年轻月球玄武岩的日期通常具有丰富的KREEP成分,对于了解自3.5 Ga以来月球的轰炸历史至关重要,而这反过来又有助于了解太阳系的年代。诸如杜鲁斯·加布布罗(Duluth Gabbro)之类的月球类似物的测量证明了对月球上的岩石进行原位测年以限制月球历史的概念证明。

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