新墨西哥州西南部Burro山脉1.46 Ga的岩浆作用和变质作用

Geology of the Gila Wilderness-Silver City area Pub Date : 1900-01-01 DOI:10.56577/ffc-59.107

J. Amato, A. O. Boullion, A. E. Sanders

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引用次数: 2

摘要

摘要:Burro山花岗岩和黑云母角闪石花岗岩组成了一个巨大的深成杂岩，切割了1.65 Ga Mazatzal省变质岩。岩体中的片理由排列的黑云母组成，在与围岩接触处最明显，而在岩体内部不存在。我们认为这种结构是在岩浆侵位过程中产生的。Burro山花岗岩局部切割体积较小的黑云母角闪岩花岗岩。对Burro山花岗岩的4个样品进行U-Pb锆石定年，得到的年龄范围为1463-1455 Ma。所有样品的加权平均207pb / 206pb测年为

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Magmatism and metamorphism at 1.46 Ga in the Burro Mountains, southwestern New Mexico

A BSTRACT — The Burro Mountain granite and biotite-hornblende granite in the Burro Mountains make up a large plutonic complex that cuts 1.65 Ga Mazatzal province metamorphic rocks. A foliation in the pluton consists of aligned biotite, is most prominent near the contact with the country rock, and is absent in the interior of the pluton. We interpret this fabric as being generated during magmatic emplacement. The Burro Mountain granite locally cuts the smaller volume biotite hornblende granite. U-Pb zircon dating of four samples of the Burro Mountain granite yielded ages ranging from 1463–1455 Ma. The weighted mean 207 Pb/ 206 Pb date from all of these samples is

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Geology of the Gila Wilderness-Silver City area

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