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首页> 外文期刊>Contributions to Mineralogy and Petrology >Mafic magmas from Mount Baker in the northern Cascade arc, Washington: probes into mantle and crustal processes
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Mafic magmas from Mount Baker in the northern Cascade arc, Washington: probes into mantle and crustal processes

机译：华盛顿州喀斯喀特北部弧形山脉贝克山的基性岩浆：探查地幔和地壳过程

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摘要

Five mafic lava flows located on the southern flank of Mount Baker are among the most primitive in the volcanic field. A comprehensive dataset of whole rock and mineral chemistry reveals the diversity of these mafic lavas that come from distinct sources and have been variably affected by ascent through the crust. Disequilibrium textures present in all of the lavas indicate that crustal processes have affected the magmas. Despite this evidence, mantle source characteristics have been retained and three primitive endmember lava types are represented. These include (1) modified low-K tholeiitic basalt (LKOT-like), (2) typical calc-alkaline (CA) lavas, and (3) high-Mg basaltic andesite and andesite (HMBA and HMA). The Type 1 endmember, the basalt of Park Butte (49.3-50.3 wt% SiO_2, Mg# 64-65), has major element chemistry similar to LKOT found elsewhere in the Cascades. Park Butte also has the lowest overall abundances of trace elements (with the exception of the HREE), indicating it is either derived from the most depleted mantle source or has undergone the largest degree of partial melting. The Type 2 endmember is represented by the basalts of Lake Shannon (50.7-52.6 wt% SiO_2, Mg# 58-62) and Sulphur Creek (51.2-54.6 wt% SiO_2, Mg# 56-57).
机译：位于贝克山南翼的五种镁铁质熔岩流是火山场中最原始的熔岩流之一。完整的岩石和矿物化学数据集揭示了这些镁铁质熔岩的多样性，它们来自不同的来源，并受到地壳上升的影响。所有熔岩中存在的不平衡质地表明，地壳过程已经影响了岩浆。尽管有这些证据，地幔源的特征仍得以保留，并且代表了三种原始的端构件熔岩类型。其中包括（1）改性的低K玄武岩玄武岩（类似LKOT），（2）典型的钙碱性（CA）熔岩和（3）高镁玄武岩安山岩和安山岩（HMBA和HMA）。 1型端基是Park Butte的玄武岩（49.3-50.3 wt％SiO_2，Mg＃64-65），具有与级联反应中其他地方发现的LKOT相似的主要元素化学。 Park Butte的痕量元素总体丰度最低（HREE除外），这表明它要么来自最贫乏的地幔来源，要么经历了最大程度的部分熔融。类型2的最终成员以香农湖（50.7-52.6 wt％SiO_2，Mg＃58-62）和硫磺溪（51.2-54.6 wt％SiO_2，Mg＃56-57）的玄武岩为代表。

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