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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Slow exhumation of UHP terranes: Titanite and rutile ages of the Western Gneiss Region, Norway
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Slow exhumation of UHP terranes: Titanite and rutile ages of the Western Gneiss Region, Norway

机译：UHP地形的缓慢挖掘：挪威西部片麻岩地区的钛铁矿和金红石年龄

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摘要

U-Pb ages of titanite and rutile were obtained from the central Western Gneiss Region, Norway, to assess the style and timing of exhumation and cooling of the Western Gneiss UHP terrane. Approximately half of the titanite ages are concordant, the majority of which yield a limited age range from 393 to 390 Ma. The other titanite data are discordant, and define discordia arrays with upper intercept ages of either similar to 938 Ma or similar to 1.6 Ga, and a lower interceptof similar to 389 Ma. Concordant rutile analyses range from 385 to 392 Ma. Both titanite and rutile ages young WNW toward the core of the orogen and are similar to 4 Ma older than Ar-40/Ar-39 muscovite ages, corresponding to a cooling rate of similar to 90 degrees C/Ma. A well-defined boundary between concordant and discordant titanite ages, in combination with the WNW-increasing P-T gradient and the similarity between muscovite cooling ages in the east and eclogite ages in the west, suggests that the WGR remained coherent throughout its exhumation history, and was progressively unroofed from east to west.A390.2 +/- 0.8 Ma titanite in the Soroyane UHP domain indicates that exhumation occurred at a vertical rate of similar to 7 mm/yr for similar to 12 Ma. These rates are slower than estimates from smaller UHP terranes, but similar to other large UHP terranes, suggesting that there may be fundamental differences in the mechanisms controlling the evolution of large UHP terranes that undergo protracted subduction and exhumation, and smaller UHP terranes that undergo rapid subduction and exhumation.
机译：从挪威西部片麻岩地区获得了钛铁矿和金红石的U-Pb年龄，以评估西部片麻岩超高压地层的挖掘和冷却方式和时间。大约一半的钛矿年龄是一致的，其中大多数产生的有限年龄范围为393至390 Ma。其他钛铁矿数据不一致，并且定义了较高的截距年龄类似于938 Ma或类似于1.6 Ga的较低截距和类似于389 Ma的较低截距的迪斯科舞厅阵列。一致的金红石分析范围为385 Ma至392 Ma。钛白铁矿和金红石年龄都比造山带中心的年轻WNW年龄大，比Ar-40 / Ar-39白云母年龄大4 Ma，对应的冷却速率大约为90摄氏度/ Ma。一致和不一致钛铁矿年龄之间的界限分明，结合WNW增加的PT梯度和东部白云母冷却年龄与西部白云母年龄之间的相似性，表明WGR在整个发掘历史上保持一致。 Soroyane UHP域中的A390.2 +/- 0.8 Ma钛铁矿表明，以12 Ma左右的垂直速率进行掘尸是在7毫米/年的垂直速率下发生的。这些速率比较小的UHP地形的估计速度要慢，但与其他大型UHP地形相似，这表明控制经历长时间俯冲和掘尸的大型UHP地形以及控制快速俯冲和发掘的大型UHP地形的演化机制可能存在根本差异。俯冲和掘尸。

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