Grenville-age pseudotachylite in the Lewisian: laserprobe 40Ar/39Ar ages from the Gairloch region of Scotland (UK)
Grenville-age pseudotachylite in the Lewisian: laserprobe 40Ar/39Ar ages from the Gairloch region of Scotland (UK)
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刘易斯系中的格伦维尔年龄假速石：来自苏格兰盖尔洛赫地区（英国）的激光探针 40Ar/39Ar 年龄
DOI：
10.1144/0016-76492006-134
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发表时间：
2008
影响因子：
2.7
通讯作者：
R. Park
中科院分区：
文献类型：
--
作者：
S. Sherlock;K. Jones;R. Park
利用红外激光探头40Ar/39Ar测年技术，对苏格兰刘易斯基底破碎带中的假玄武岩和寄主岩石矿物进行了测年。它揭示了假玄武岩数据的复杂性，这可归因于假玄武岩中存在难熔的寄主岩石碎屑和矿物碎片。结合寄主岩石矿物40Ar/39Ar数据，可以简化样品的假玄武岩数据，其最佳年龄分别为：980±39 Ma、999±31 Ma和1024±30 Ma(2σ)。这些年龄是路易斯人格伦维尔时代脆性变形的第一个记录。此外，这项研究还说明了假黄长石测年的复杂性，以及红外激光探头应用于这类物质的优势和局限性。
Infrared laserprobe 40Ar/39Ar dating has been used to date pseudotachylite and host-rock minerals from a crush belt in the Lewisian basement of Scotland. It has revealed complexity in the pseudotachylite data that is attributable to the presence of refractory host-rock clasts and mineral fragments in the pseudotachylite. In conjunction with the host-rock mineral laserprobe 40Ar/39Ar data it has been possible to simplify the pseudotachylite data for the samples, and the preferred ages for these are: 980 ± 39 Ma, 999 ± 31 Ma and 1024 ± 30 Ma (2σ). These ages are the first record of Grenville-aged brittle deformation in the Lewisian. Further, this study serves to illustrate the complexity of dating pseudotachylites, and the advantages and limitations of the IR laserprobe applied to such materials.