Timing and duration of mare basalt magmatism: constraints from lunar samples
Timing and duration of mare basalt magmatism: constraints from lunar samples
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发表时间：
2008-03
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通讯作者：
M. Anand;K. Terada
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作者：
M. Anand;K. Terada
月球科学中的一个重要问题是了解月海岩浆活动的时间和持续时间，这对月球内部随时间的热演化具有重要意义。对月球的遥感研究表明，月海区域的存在年龄为4 Ga，年轻时为1 Ga。相比之下，大多数基于实验室的研究，涉及直接年龄测定的“返回”玄武岩月球样本（从阿波罗和月球任务，和月球陨石）的放射性技术产生了更窄的年龄范围为月海岩浆活动，通常在3.9至3.1 Ga的时间间隔。然而，很少有人注意到一些值得注意的例子，古代月海岩浆作用，其中存在的样品在4.2 - 4.3 Ga玄武岩。最近，一些玄武岩月球样品的年代学研究显示，结晶年龄比以前已知的月海玄武岩年龄范围更老，也更年轻。这些新发现使我们有必要重新审视月球上玄武岩火山活动的年龄和持续时间，以及它对月球演化的原因和后果，并对吸积后的行星分化过程产生影响。
One of the important issues in lunar science relates to the understanding of the timing and duration of mare magmatism which has significant implications for the thermal evolution of the lunar interior through time. Remote sensing studies of the Moon have indicated existence of mare regions as old as 4 Ga and as young as 1 Ga. In contrast, most lab-based studies involving direct age dating of “returned” basaltic lunar samples (from Apollo and Luna missions, and lunar meteorites) by radiometric techniques have yielded much narrower age ranges for mare magmatism, typically in the time interval of 3.9 to 3.1 Ga. However, less attention have been given to some notable examples of ancient mare magmatism, samples of which exist in terms of 4.2 – 4.3 Ga basalts. Recently, a number of chronological investigations of basaltic lunar samples have revealed crystallization ages which are older, as well as, younger, than previously known range for mare basalt ages. These new findings have necessitated revisiting the topic of ages and duration of basalt volcanism on the Moon and the causes and consequences of it for the lunar evolution with implications for post-accretion planetary differentiation processes.