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首页> 外文期刊>Contributions to Mineralogy and Petrology >Magma accumulation rates and thermal histories of plutons of the Sierra Nevada batholith, CA
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Magma accumulation rates and thermal histories of plutons of the Sierra Nevada batholith, CA

机译：内华达山脉岩床岩浆的岩浆堆积速率和热史

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Zircon U–Pb geochronology results indicate that the John Muir Intrusive Suite of the central Sierra Nevada batholith, California, was assembled over a period of at least 12 Ma between 96 and 84 Ma. Bulk mineral thermochronology (U–Pb zircon and titanite, 40Ar/39Ar hornblende and biotite) of rocks from multiple plutons comprising the Muir suite indicates rapid cooling through titanite and hornblende closure following intrusion and subsequent slow cooling through biotite closure. Assembly of intrusive suites in the Sierra Nevada and elsewhere over millions of years favors growth by incremental intrusion. Estimated long-term pluton assembly rates for the John Muir Intrusive Suite are on the order of 0.001 km3 a−1 which is inconsistent with the rapid magma fluxes that are necessary to form large-volume magma chambers capable of producing caldera-forming eruptions. If large shallow crustal magma chambers do not typically develop during assembly of large zoned intrusive suites, it is doubtful that the intrusive suites represent cumulates left behind following caldera-forming eruptions.
机译：Zircon U–Pb地质年代学结果表明，位于加利福尼亚内华达山脉中部岩床的John Muir侵入套件是在96 Ma至84 Ma之间至少12 Ma的时间内组装的。包括Muir套件在内的多个俯冲体的岩石的块状矿物热年代学（U–Pb锆石和钛矿， 40 Ar / 39 Ar角闪石和黑云母）表明通过钛矿和角闪石的快速冷却入侵后关闭，随后通过黑云母封闭缓慢冷却。几百万年来，在内华达山脉和其他地区组装入侵套件，通过逐步入侵来促进增长。 John Muir Intrusive Suite的估计长期岩体组装速率约为0.001 km 3 a -1 ，这与快速岩浆通量不符。形成能够产生火山口爆发的大容量岩浆室。如果在大型分区侵入套件的组装过程中通常不形成大型浅地壳岩浆室，则怀疑侵入套件是否代表了火山口形成爆发后留下的堆积物。

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