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首页> 外文期刊>Contributions to Mineralogy and Petrology >Contrasting thermal and melting histories for segments of mantle lithosphere in the Nahlin ophiolite, British Columbia, Canada
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Contrasting thermal and melting histories for segments of mantle lithosphere in the Nahlin ophiolite, British Columbia, Canada

机译：加拿大不列颠哥伦比亚省赤林岩石岩系的岩石圈段的热和熔化历史

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摘要

The Permo-Triassic Nahlin ophiolite is the largest and best-preserved ophiolite in the Canadian Cordillera of British Columbia and Yukon, Canada. The ophiolite is well-exposed along its similar to 150 km length with mantle segments divisible into the Hardluck and Menatatuline massifs. Both massifs comprise mostly depleted spinel harzburgite ( 2 wt% Al2O3 and similar to 45 wt% MgO). Chondrite normalized REE abundances in clinopyroxene vary in (Gd/Yb)(N) from 0.2 to 1.1. Inversion modelling of clinopyroxene REE abundances requires 10-16% and 16-20% partial melting in the Hardluck and Menatatuline massifs, respectively. The two-pyroxene and Fe-Mg exchange temperatures in the mantle of the ophiolite also change systematically along strike with the degree of partial melt depletion. The temperatures recorded by REE and Ca-Mg exchange between coexisting pyroxenes require markedly higher peak temperatures and cooling rates for the Menatatuline massif (1250 degrees C, 0.1-0.01 degrees C/year) compared to the Hardluck massif ( 1100 degrees C, - 10(-4) degrees C/year). The differences between these two contiguous massifs can be reconciled by their evolution as two separate segments along a ridge system having varying melt depletion, with contrasting cooling rates controlled by presence or absence of a crustal section above the mantle lithosphere, or by rapid exhumation along a detachment.
机译：Permo-Triassic Nahlin Ophiolite是加拿大不列颠哥伦比亚省加拿大Cordillera的最大且保存完好的眼科矿石。孔矿石沿着其类似于150 km长度的曝光，搭腔段可分开到硬碰撞和制育含量的地块中。两种质量块都包含大部分耗尽的尖晶石麦芽矿（＆lt 2重量％的Al 2 O 3，类似于45wt％MgO）。 Clondrite归一化的Clinococexene的REE丰度（Gd / Yb）（n）的曲折来自0.2至1.1。 Closopyroxene REE丰度的反转建模分别需要10-16％和16-20％的偏熔化，分别在Hardluck和MenataTuline Massifs中熔化。眼吡啶型幔中的两季辛和Fe-Mg交换温度也随着部分熔体耗尽的程度来系统地改变。 Coexisting Pyroxenes之间的REE和CA-MG交换记录的温度需要明显较高的峰值温度和与硬隆的MASSIF（1100℃， - 10（-4）C /岁）。这两个连续的质量件之间的差异可以通过它们的演进和沿着具有变化熔体耗尽的脊系统的两个单独的区段来协调，其通过在地幔岩石圈的存在或不存在的地壳部分或通过沿着快速挖掘来控制对比的冷却速率分离。

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