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首页> 外文期刊>Contributions to Mineralogy and Petrology >Origin of quartz clusters in Vinalhaven granite and porphyry, coastal Maine
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Origin of quartz clusters in Vinalhaven granite and porphyry, coastal Maine

机译：缅因州沿海Vinalhaven花岗岩和斑岩中的石英团簇起源

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We use the crystallographic orientations of quartz crystals, as determined with EBSD, to provide new evidence for the formation of clustered quartz crystals during magma crystallization. Vinalhaven is dominated by granite, with minor porphyry that formed when granite remelted during input of coeval basalt. CL zoning suggests that most quartz clusters in granite and porphyry formed by synneusis, the "swimming together" of preformed crystals. In granite, most quartz pairs in clusters have random orientations-only about 10% have parallel or Esterel twin orientations. Porphyry has fewer quartz clusters, and all pairs have approximately parallel or Esterel twin orientations. CL zoning of quartz pairs in porphyry indicates that they attached prior to a major remelting event. Interpretation of the Vinalhaven quartz clusters leads us to propose that oriented synneusis occurs during crystal accumulation on a magma chamber floor.
机译：我们使用EBSD确定的石英晶体的晶体学取向，为岩浆结晶过程中簇状石英晶体的形成提供了新的证据。 Vinalhaven以花岗岩为主导，在古代玄武岩输入期间花岗岩重熔时形成了少量斑岩。 CL分区表明，花岗岩和斑岩中的大多数石英团簇是通过协同作用形成的，即预制晶体的“游动”。在花岗岩中，成簇的大多数石英对都具有随机取向，只有大约10％的石英具有平行或Esterel孪晶取向。斑岩具有较少的石英团簇，并且所有对都具有近似平行或Esterel孪晶取向。斑岩中石英对的CL分区表明，它们在发生重大重熔事件之前就已附着。 Vinalhaven石英团簇的解释使我们提出定向的协同作用发生在岩浆室底板上的晶体堆积过程中。

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