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首页> 外文OA文献 >Isotopic compositions of intrusive rocks from the Wallowa and Olds Ferry arc terranes of northeastern Oregon and western Idaho: Implications for Cordilleran evolution, lithospheric structure, and Miocene magmatism
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Isotopic compositions of intrusive rocks from the Wallowa and Olds Ferry arc terranes of northeastern Oregon and western Idaho: Implications for Cordilleran evolution, lithospheric structure, and Miocene magmatism

机译：来自俄勒冈州和奥德隆东北部和西红霍斯的侵入性岩石的同位素组成和奥德郡和西红霍斯西部的弧形田园：对科尔凯伦演进，岩石结构和内科岩狼的影响

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摘要

Late Paleozoic and Mesozoic intrusive rocks from the Wallowa and Olds Ferry arc terranes of the Blue Mountains Province, Oregon-Idaho, provide constraints on the paleogeographic and tectonic setting of magmatism preserved in both arcs. Sr, Nd, and Pb isotopic data show that the Wallowa terrane represents an isotopically depleted, juvenile intra-oceanic island arc. By contrast, isotopic data for intrusive rocks of the Olds Ferry arc are more isotopically enriched, and thereby establish a clear distinction between the two arcs. This distinction strengthens paleogeographic interpretation of the Olds Ferry terrane as a fringing continental arc, and it provides a basis for correlation to other inboard Cordilleran arc terranes including Quesnellia and Stikinia. The Wallowa terrane is by contrast more similar geologically and isotopically to the outboard Insular terranes.These isotopic data also constrain interpretations of regional lithospheric architecture. Isotopic profiles generated orthogonal to the inferred Wallowa–Olds Ferry terrane boundary and the western Idaho shear zone show abrupt increases in initial 87Sr/86Sr that mark the transitions between three geochemically distinct lithospheric columns. West-to-east spatial variability in the isotopic compositions of Neogene volcanic rocks is explained by the partial melting of these three geochemically distinct mantle reservoirs coupled to their respective crustal columns since the early Mesozoic, rather than alternative models of lithosphere-scale décollement offset during Sevier shortening. The inherited arc-related mantle of the Olds Ferry arc may also have played a primary role in the petrogenesis of distinctive Neogene low-K, high-alumina olivine tholeiites of the High Lava Plains.
机译：来自Wallowa和Olds的古生代和中生代侵入性岩石的蓝山省，俄勒冈州省，俄勒冈州省，俄勒冈州省，为两弧保存的古地理和构造环境提供了约束。 SR，ND和PB同位素数据表明，Wallowa Terrane代表了一个同位素耗尽，少年内海岛弧。相比之下，旧渡轮弧形侵入岩石的同位素数据更加同比富集，从而在两个弧之间建立清晰的区别。这种区别加强了Olds Ferry Terrane作为流苏大陆弧的古地理解释，它为包括昆西亚和Stikinia等其他舷内弧形畜脉相关的基础。 Wallowa Terrane在地质上和同位素上的对比度是对比的舷外境内。这些同位素数据也限制了区域型岩石架构的解释。与推断的Wallowa-Olds Ferry Terrane边界产生正交产生的同位素谱表现出初始87SR / 86SR的突然增加，标记在三个地球化学不同的岩石柱之间的过渡。通过早期中生代自早期中生代以来，这三个地球化学上的岩土储存器的部分熔化来解释Neocene Volcanic岩石同位素组成的西对空间变异性，而不是岩石圈级别偏移期间的岩石圈规模偏移的替代模型Sevier缩短。旧的渡轮弧的继承的弧形弧形也可能在高熔岩平原的特异性新生低k，高氧化铝橄榄石山竹的纤维化中发挥着主要作用。

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