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首页> 外文期刊>Contributions to Mineralogy and Petrology >Eclogites of the North Atlantic Craton: insights from the Chidliak eclogite xenoliths (S. Baffin Island, Canada)
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Eclogites of the North Atlantic Craton: insights from the Chidliak eclogite xenoliths (S. Baffin Island, Canada)

机译：北大西洋克拉顿的eClogites：来自Chidliak Eclogite Xenoliths的见解（加拿大邦辛岛）

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摘要

The 156-138 Ma Chidliak kimberlites on the Eastern Hall peninsula (EHP) of Baffin Island entrained mantle xenoliths interpreted to have been a part of the Archean North Atlantic Craton (NAC) lithospheric mantle. We studied 19 Chidliak eclogite xenoliths that comprise 10 bimineralic, 5 rutile-bearing, 3 orthopyroxene-bearing and 1 kyanite-bearing eclogites. We report major and trace element compositions of the minerals, calculated bulk compositions, pressures and temperatures of the rock formation and model melt extraction from viable protoliths. The eclogite samples are classified into three groups of HREE-enriched, LREE-depleted and metasomatized based on their reconstructed whole-rock REE patterns. PT parameters of the eclogites were calculated by projecting garnet-clinopyroxene temperatures onto the localP-Tarrays for 65 Chidliak peridotite xenoliths. All Chidliak eclogites are equilibrated in the diamondP-Tfield and cluster in two groups, low-temperature (n = 5, 840-990 degrees C at 4.1-5.0 GPa) and high-temperature (n = 11,T > 1320 degrees C atP > 7.0 GPa). The reconstructed Mg-rich major element bulk compositions and trace elements patterns are similar to Archean basalts from the North Atlantic and Superior cratons and the oceanic gabbros. The LREE-depleted Chidliak eclogites could be residues after 15-55% partial melting of Archean basalt at the eclogite facies of metamorphism that led to extraction of a tonalite-trondhjemite-granodiorite melt from the EHP. The HREE-depleted eclogites may have experienced a lower degree (<10%) of partial melting. Two eclogites may have formed after the gabbro protolith based on the presence of kyanite, high Sr content of garnet and positive Eu anomalies in garnet and bulk eclogite compositions. The metasomatism is reflected in higher Ce/Yb, Sr/Y, TiO(2)or MgO of the eclogites. The average contents of MgO, FeO and CaO in NAC eclogites are statistically distinct from those in Slave craton eclogites with a probability of >95%. The former are more magnesian, less ferrous and calcic, contain more magnesian and less calcic garnets, and lower proportions of group C eclogites. The contrast may relate to the stronger NAC metasomatism by silicate-carbonate melt observed in Chidliak peridotitic mantle, or to the different formation ages of the eclogites beneath the two cratons.
机译：在东部霍尔半岛（EHP）的156-138 Ma Chidliak金伯利莱斯夹带的壁龛Xenoliths被解释为Archean North大西洋克拉顿（NAC）岩石树木地幔的一部分。我们研究了19个Chidliak Eclogite Xenoliths，包括10个氨氨型，5孔轴承，3个矫形轴承和1个含kyanite的eGlogites。我们报告了矿物质的主要和痕量元素组成，岩石形成的岩石组合物，压力和温度和来自活促酚的模型熔体提取。将Eclogite样品分为三组富含HREE富含的，基于其重建的全摇滚REE模式。通过将石榴石瓣环节温度突出到局部水溶性甲状腺素Xenoliths的局部水溶性至局部水溶液中来计算Eclogites的Pt参数。所有Chidliak Eclogites都在二组中的Diamondp-TFIELD和群体中平均，低温（n = 5,840-990摄氏度为4.1-5.0GPa）和高温（n = 11，T> 1320摄氏度C ATP > 7.0 GPA）。重建的MG丰富的主要元素散装组合物和微量元素图案类似于来自北大西洋和高级碎屑和海洋Gabbros的Archean Bably。在变质形状的eClogite相的eRHogite相的偏重15-55％的偏熔过程之后，嗜嘴耗尽的白炽emlogites可能是从EHP中提取铜矿 - Trondhjemite-Granodiorite熔体的偏心。 HREE耗尽的eClogites可能经历了较低程度（<10％）的部分熔化。在Gabbro促果原基于Kyanite，高级SR含量的石榴石和散装庚酸盐组合物中的阳性欧盟异常的存在之后，可以形成两个eNlogites。弥扑术反映在更高的Ce / Yb，Sr / Y，TiO（2）或MgO的eClogites中。 NAC Eclogites中MgO，Feo和Cao的平均含量与诸如奴隶牧师eClogites中的统计学不同，概率为> 95％。前者更加镁，不含黑硅和钙，含有更多的镁质和较少的钙的装饰，以及较低的C组eClogites比例。对比度可以通过在白氏岩石岩石壳体中观察到的硅酸盐 - 碳酸盐熔体，或两种粪便下方的eClogites的不同形成年龄的硅酸盐 - 碳酸盐熔体有关。

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