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首页> 外文期刊>Contributions to Mineralogy and Petrology >Carbonate-rich melt infiltration in peridotite xenoliths from the Eurasian-North American modern plate boundary (Chersky Range, Yakutia)
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Carbonate-rich melt infiltration in peridotite xenoliths from the Eurasian-North American modern plate boundary (Chersky Range, Yakutia)

机译：来自欧亚-北美现代板块边界（谢尔盖山脉，雅库特）的橄榄岩异岩中富含碳酸盐的熔体渗透

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摘要

A suite of mainly spinel peridotite and subordinate pyroxenite xenoliths and megacrysts were studied in detail, enabling us to characterize upper mantle conditions and processes beneath the modern North American-Eurasian continental plate boundary. The samples were collected from 37-Ma-old basanites cropping out in the Main Collision Belt of the Chersky Range, Yakutia Republic (Russian Far East). The spinel lherzolites reflect a mantle sequence, equilibrated at temperatures of 890-1,025 °C at pressures of 1.1-2 GPa, with melt extraction estimated to be around 2-6 %. The spinel harzburgites are characterized by lower P-T equilibration conditions and estimated melt extraction up to 12 %. Minor cryptic metasomatic processes are recorded in the clinopyroxene trace elements, revealing that percolating hydrous fluid-rich melts and basaltic melts affected the peridotites. One of the lherzolites preserves a unique melt droplet with primary dolomite in perfect phase contact with Na-rich aluminosilicate glass and sodalite.
机译：详细研究了一组主要为尖晶石的橄榄岩，次生的辉石岩的异岩和巨晶，这使我们能够表征现代北美-欧亚大陆板块边界下的上地幔条件和过程。样品是从雅库特共和国（俄罗斯远东地区）切尔斯基山脉主碰撞带中切出的37 Ma古老的玄武岩中收集的。尖晶石水铁矿反映出地幔序列，该地幔序列在890-1025°C的温度下以1.1-2 GPa的压力达到平衡，熔体萃取率约为2-6％。尖晶石harzburgite的特征在于较低的P-T平衡条件，估计熔体提取率高达12％。在斜向辉石微量元素中记录了次要隐密交代过程，揭示了渗漏的含水富液熔体和玄武质熔体对橄榄岩的影响。其中一种锂铁矿与原始白云石保持独特的熔滴，并与富钠的铝硅酸盐玻璃和方钠石形成完美的相接触。

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