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首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >Paleo-Asian oceanic subduction-related modification of the lithospheric mantle under the North China Craton: Evidence from peridotite xenoliths in the Datong basalts
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Paleo-Asian oceanic subduction-related modification of the lithospheric mantle under the North China Craton: Evidence from peridotite xenoliths in the Datong basalts

机译：华北克拉通下岩石圈地幔的古亚洲洋俯冲作用改造：来自大同玄武岩中橄榄岩异岩的证据

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摘要

In-situ major and trace elements and Sr isotopic compositions of peridotite xenoliths of the Datong Quaternary alkaline basalt were analyzed to evaluate the influences of the southward subduction of the Paleo-Asian oceanic plate (PAOP) on the lithospheric mantle transformation of the North China Craton (NCC). These peridotite xenoliths including spinel harzburgites and lherzolites were classified into three groups. The type 1 peridotites have the lowest temperatures (961-1007 degrees C). Clinopyroxenes in these peridotites exhibit LREE-depleted REE patterns and have the lowest Sr-87/Sr-86 ratios of 0.70243-0.70411. The type 2 and 3 peridotites show higher temperatures (1017-1022 degrees C). Clinopyroxenes in the type 2 peridotite have V-shaped REE patterns and relatively higher 87Sr/86Sr ratios of 0.70418-0.70465. Clinopyroxenes in the type 3 peridotite have concave-downward REE patterns and unusually high Sr-87/Sr-86 ratios of 0.70769-0.70929. Carbonatitic veinlets are found in the type 1 peridotites. They show steep LREE-enriched REE patterns with enrichment in LILE and depletion in HFSE, and have the highest Sr-87/Sr-86 ratios of 0.71145-0.71285.
机译：分析了大同第四纪碱性玄武岩橄榄岩异岩的主要，微量元素和Sr同位素组成，以评价古亚洲洋板块南俯冲对华北克拉通岩石圈地幔转换的影响。 （NCC）。这些橄榄岩异岩包括尖晶石harzburgite和锂铁矿分为三类。 1型橄榄岩的温度最低（961-1007摄氏度）。这些橄榄岩中的斜茂铁表现出贫稀土的稀土元素特征，其Sr-87 / Sr-86比率最低，为0.70243-0.70411。 2型和3型橄榄岩的温度较高（1017-1022摄氏度）。 2型橄榄岩中的斜茂铁具有V形REE模式，相对较高的87Sr / 86Sr比为0.70418-0.70465。 3型橄榄岩中的斜辉石具有向下凹的REE模式，且Sr-87 / Sr-86的比值非常高，为0.70769-0.70929。在1型橄榄岩中发现了碳酸盐岩脉。它们显示出陡峭的富含LREE的REE模式，其中LILE富集并且HFSE耗尽，并且Sr-87 / Sr-86比率最高，为0.71145-0.71285。

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