马利扎多伊橄榄岩-辉绿岩地块:结晶计算模型和母体熔体地球化学指标参数评估

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2024-05-27 DOI:10.1134/S0869591124700036
A. V. Lavrenchuk, D. P. Gladkochub, O. M. Turkina, A. S. Mekhonoshin, Ya. Yu. Shelepov
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引用次数: 0

摘要

摘要 通过模型计算,估算了与位于西伯利亚克拉通西南部 Sharyzhalgai 隆起的伊尔库特区块的 Malyi Zadoi 地块形成相应的碎裂结晶过程中的熔体成分。研究表明,该地块的榴辉岩与斜长角闪岩和橄榄石榴辉岩是共生的。根据对模型熔体成分的估计,可以确定母体熔体的地幔源成分。地球化学特征使我们认为,Malyi Zadoi 地块的母体熔体是由富集源熔化形成的,这一结论与同位素数据相一致,同位素数据表明地幔 Sm/Nd 比率在奥歇纪有所下降。母体熔体的可能来源可能是贫化的岩石圈地幔物质,由来自俯冲大洋板块岩石的长岩熔体变质而成。
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Malyi Zadoi Peridotite−Gabbronorite Massif: Computational Modeling of Crystallization and Evaluation of Indicator Geochemical Parameters of the Parental Melt

Model calculations were used to estimate the compositions of melts during fractional crystallization corresponding to the formation of the Malyi Zadoi massif, which is located in the Irkut block of the Sharyzhalgai uplift in the southwest of the Siberian craton. It is shown that the gabbronorites of the massif are comagmatic to the plagioperidotites and olivine gabbronorites. The estimates obtained for the composition of the model melts are used to characterize the composition of the mantle source of the parental melt. The geochemical characteristics led us to suggest that the parental melt of the Malyi Zadoi massif was formed by melting an enriched source, a conclusion consistent with isotope data that indicate that the mantle Sm/Nd ratio decreased in the Archean. The probable source of the parental melt could consist of depleted lithospheric mantle material metasomatized by felsic melts coming from rocks of a subducting oceanic plate.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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