Petrogenesis and Sources for Rocks of the Rare-Metal Alkaline Burpalа Intrusion (Northern Baikal Region)

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
A. G. Doroshkevich, V. M. Savatenkov, A. V. Malyutina, I. A. Izbrodin, I. R. Prokopiev, A. E. Starikova, T. A. Radomskaya
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引用次数: 0

Abstract

The paper reports the results of petrologic and geochemical study of the Burpala alkaline intrusion composed of quartz syenites, alkaline and nepheline syenites, including ore-bearing varieties, which is a part of the Late Paleozoic North Baikal Alkaline Province. Chemically, the studied rocks belong to foid monzosyenites, foid syenites and syenites, ranging from agpaitic to miascitic varieties. Close Sr-Nd isotopic characteristics and geochemical patterns confirm the syngenetic nature of magmas that produced nepheline, alkaline, and quartz syenites. A negative Eu anomaly in the REE patterns and sufficiently low Mg# of rocks testify in favor of a prolonged fractional crystallization of rocks from an alkaline-basic melt. Sr-Nd-Pb isotopic and geochemical characteristics of rocks of the Burpala intrusion reflect the predominance of metasomatized lithospheric mantle in their source. The formation of the rocks of the intrusion, according to the trace element and isotopic data, was complicated by the upper crustal assimilation, which likely determined the genetic relationship between nepheline and quartz syenites within the intrusion.

Abstract Image

北贝加尔湖地区稀有金属碱性布尔帕尔岩体成因及岩石来源
本文报道了北贝加尔湖晚古生代碱性省布尔帕拉碱性侵入岩的岩石学和地球化学研究结果,该侵入岩由石英正长岩、碱性正长岩和榴石正长岩组成,包括含矿品种。从化学上看,所研究的岩石分别属于双长正长岩、双长正长岩和正长岩,从泥质到泥质不等。密切的Sr-Nd同位素特征和地球化学模式证实了岩浆的同生性质,这些岩浆产生了霞石、碱性和石英正长岩。稀土元素模式中的Eu负异常和岩石中足够低的mg#证明了岩石从碱性熔体中长期分离结晶。Burpala侵入岩的Sr-Nd-Pb同位素和地球化学特征反映了交代岩石圈地幔在其来源上的优势。微量元素和同位素数据表明,上地壳的同化作用使岩体的形成变得复杂,这可能决定了岩体内霞石和石英正长岩的成因关系。
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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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