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地球学报  2004 

大别-苏鲁造山带南北两侧晚中生代富钾火山岩的成因:微量元素及Sr-Nd-Pb同位素制约

Keywords: 富钾火山岩,地球化学,源区富集,岩石成因,大别-苏鲁造山带

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Abstract:

大别-苏鲁造山带南、北两侧广泛发育晚中生代富钾火山岩,主要岩石组合为粗面玄武岩-玄武粗安岩-粗安岩-安粗岩姐面岩,这套岩石总体具有富碱、富钾、富轻稀土和大离子亲石元素(如Rb、Th等),贫高场强元素(如Nb、Ti等),(^87Sr/^86Sr),值偏高,εNd(t)值偏低等特点,但南、北两侧富钾火山岩的地球化学特征存在较显著的差异,主要表现在造山带北侧富钾火山岩稀土总量更高,轻、重稀土分异更明显,且(^87Sr/^86Sr),值更高,eNd(t)值和^206Pb/^204Pb值显著偏低。元素-同位素综合示踪显示,区内富钾火山岩均起源于富集地幔的部分熔融,但南、北两侧源区地幔的富集机制存在差异,南侧富集地幔的形成主要与俯冲洋壳析出流体的交代作用有关,而北侧富集地幔的形成除受到俯冲洋壳析出流体的交代作用外,在更大程度上主要起因于俯冲的扬子陆壳析出流体的交代作用,即其源区遭受了多次富集事件的影响,后者是导致南、北两侧富钾火山岩地球化学特征差异的主要原因。

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