Isotope Compositions of Submarine Hana Ridge Lavas, Haleakala Volcano, Hawaii: Implications for Source Compositions, Melting Process and the Structure of the Hawaiian Plume
Isotope Compositions of Submarine Hana Ridge Lavas, Haleakala Volcano, Hawaii: Implications for Source Compositions, Melting Process and the Structure of the Hawaiian Plume
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DOI：
10.1093/petrology/egi074
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发表时间：
2006-02
影响因子：
3.9
通讯作者：
Zhong‐Yuan Ren;T. Shibata;M. Yoshikawa;K. Johnson;E. Takahashi
中科院分区：
文献类型：
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作者：
Zhong‐Yuan Ren;T. Shibata;M. Yoshikawa;K. Johnson;E. Takahashi
我们报告的Sr，Nd，Pb同位素组成的17个散装岩石样品从海底哈纳岭，哈雷阿卡拉火山，夏威夷，收集了三个潜水由海惠子在2001年联合日美夏威夷巡航。海底哈纳海岭熔岩的Sr、Nd和Pb同位素比值与基拉韦厄熔岩相似。这与哈雷阿卡拉地盾的陆上霍诺马努熔岩的同位素比率形成对比，后者类似于莫纳罗亚火山熔岩或介于基拉韦厄和莫纳罗亚火山田之间。Kea和Loa成分在个别地盾中共存的观察结果与夏威夷链内火山的位置控制Loa和Kea趋势地球化学特征的地理分布的解释不一致。Haleakala盾熔岩的同位素和微量元素比值表明，回收的洋壳辉长岩成分存在于地幔源。结合岩石学模拟计算，使用微量元素反演和pMELTS的熔岩的地球化学特征表明，熔融深度逐渐减少的地幔源在屏蔽生长过程中，并回收的海洋辉长岩成分的比例较高，在夏威夷盾的后期阶段的火山迁移远离中心轴的羽流。
We report Sr, Nd, and Pb isotope compositions for 17 bulk-rock samples from the submarine Hana Ridge, Haleakala volcano, Hawaii, collected by three dives by ROV Kaiko during a joint Japan–US Hawaiian cruise in 2001. The Sr, Nd, and Pb isotope ratios for the submarine Hana Ridge lavas are similar to those of Kilauea lavas. This contrasts with the isotope ratios from the subaerial Honomanu lavas of the Haleakala shield, which are similar to Mauna Loa lavas or intermediate between the Kilauea and Mauna Loa fields. The observation that both the Kea and Loa components coexist in individual shields is inconsistent with the interpretation that the location of volcanoes within the Hawaiian chain controls the geographical distribution of the Loa and Kea trend geochemical characteristics. Isotopic and trace element ratios in Haleakala shield lavas suggest that a recycled oceanic crustal gabbroic component is present in the mantle source. The geochemical characteristics of the lavas combined with petrological modeling calculations using trace element inversion and pMELTS suggest that the melting depth progressively decreases in the mantle source during shield growth, and that the proportion of the recycled oceanic gabbroic component sampled by the melt is higher in the later stages of Hawaiian shields as the volcanoes migrate away from the central axis of the plume.