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首页> 外文期刊>Contributions to Mineralogy and Petrology >Effect of melt composition on basalt and peridotite interaction: laboratory dissolution experiments with applications to mineral compositional variations in mantle xenoliths from the North China Craton
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Effect of melt composition on basalt and peridotite interaction: laboratory dissolution experiments with applications to mineral compositional variations in mantle xenoliths from the North China Craton

机译：熔体组成对玄武岩和橄榄岩相互作用的影响：实验室溶出实验及其对华北克拉通地幔异种岩矿物组成变化的应用

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摘要

Interaction between basaltic melts and perido-tites has played an important role in modifying the litho-spheric and asthenospheric mantle during magma genesis in a number of tectonic settings. Compositions of basaltic melts vary considerably and may play an important role in controlling the kinetics of melt-peridotite interaction. To better understand the effect of melt composition on melt-peridotite interaction, we conducted spinel lherzolite dissolution experiments at 2 GPa and 1,425℃ using the dissolution couple method. The reacting melts include a basaltic andesite, a ferro-basalt, and an alkali basalt. Dissolution of lherzolite in the basaltic andesite and the ferro-basalt produced harzburgite-lherzolite sequences with a thin ortho-pyroxenite layer at the melt-harzburgite interface, whereas dissolution of lherzolite in the alkali basalt produced a dunite-harzburgite-lherzolite sequence. Systematic variations in mineral compositions across the lithological units are observed. These mineral compositional variations are attributed to grain-scale processes that involve dissolution, precipitation, and reprecipitation and depend strongly on reacting melt composition. Comparison of mineral compositional variations across the dissolution couples with those observed in mantle xenoliths from the North China Craton (NCC) helps to assess the spatial and temporal variations in the extent of siliceous melt and peridotite interaction in modifying the lithospheric mantle beneath the NCC. We found that such melt-rock interaction mainly took place in Early Cretaceous, and is responsible for the enrichment of pyroxene in the lithospheric mantle. Spatially, siliceous melt-peridotite interaction took place in the ancient orogens with thickened lower crust.
机译：玄武质熔体与橄榄岩之间的相互作用在许多构造背景下的岩浆形成过程中对岩石圈和软流圈地幔的改变起了重要作用。玄武质熔体的成分变化很大，并且可能在控制熔体-橄榄岩相互作用的动力学中起重要作用。为了更好地理解熔体组成对熔体-橄榄岩相互作用的影响，我们采用溶出偶合方法在2 GPa和1,425℃下进行了尖晶石锂铁矿溶出实验。反应的熔体包括玄武安山岩，铁玄武岩和碱性玄武岩。钙铁矿在玄武岩安山岩中和铁玄武岩中的溶解产生了在熔融-钙锌矿界面上具有薄的原辉辉石层的辉石-锂铁矿序列，而锂铁矿在碱性玄武岩中的溶解则产生了榴辉岩-锌铁矿-锂铁矿序列。观察到整个岩性单元中矿物成分的系统变化。这些矿物成分的变化归因于晶粒度过程，该过程涉及溶解，沉淀和再沉淀，并且在很大程度上取决于反应的熔体成分。比较华北克拉通（NCC）地幔异岩中溶蚀对的矿物成分变化，有助于评估硅质熔体和橄榄岩相互作用程度的时空变化，从而改变了NCC下方的岩石圈地幔。我们发现这种熔岩相互作用主要发生在白垩纪早期，并且是岩石圈地幔中辉石富集的原因。在空间上，硅质熔体-橄榄岩的相互作用发生在古老的造山带，下地壳增厚。

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