Rocks of the Ary-Bulak Ongonite Massif: Relationship between Geochemical Features, Mineral-Phase Assemblages, and Formation Processes

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2024-05-27 DOI:10.1134/S0869591124700061
I. S. Peretyazhko, E. A. Savina, A. S. Dmitrieva
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Abstract

The paper reports the study of geochemistry, mineral-phase assemblages of rocks of the Ary-Bulak ongonite massif, compositions of major, minor and accessory minerals (quartz, feldspars, topaz, zinnwaldite, prosopite, rare Ca–Al-fluorides, W-ixiolite, columbite, zircon, cassiterite, and fluocerite), fluoride–calcium (F–Ca) phase, and fluorite formed from it. The rock-forming minerals of porphyritic ongonites are quartz, albite and sanidine, and minor minerals are topaz and zinnwaldite. The ongonitic matrix is composed of a quartz–sanidine–albite assemblage with micron-sized needle-shaped topaz crystals. In transitional porphyritic rocks and in the endocontact aphyric zone, the interstices between matrix minerals are filled with a F–Ca phase formed from a F–Ca (fluoritic) stoichiometric melt. Fluoride–silicate liquid immiscibility in ongonitic magma and fluid-magmatic processes led to the redistribution of REE, Y, and many trace elements between melts, fluids, minerals and a contrasting change in mineral-phase assemblages in the rocks. This is associated with the appearance of M-type (T1 La–Nd, T4 Er–Lu) and W-type (T3 Gd–Ho) tetrad effects in the chondrite-normalized REE patterns of rocks. Degassing of magmatic fluids through the endocontact aphyric zone was accompanied by the crystallization of Sr-bearing prosopite and hydrous Ca–Al-fluorides. Aphyric rocks, compared to porphyritic ongonites and porphyritic transitional rocks, are enriched in H2O, Sr, Ba, Rb, Sn, W, Ta, Be, Zr, Hf, Sb, As, Sc, but contain less Li, Pb, Zn, Y and REE. During the effect of magmatic fluids on rocks enriched in Ca and F, especially in the endocontact aphyric zone, albite was partially or completely replaced by the F–Ca phase and kaolinite, and the F–Ca phase recrystallized into aggregates of micron-sized grains of stoichiometric fluorite without trace elements. Rb-Cs mica also crystallized in the rim of zinnwaldite laths, the zones of which maximally enriched in rubidium with the cation relation Rb > K > Cs may be a new mineral. The geochemistry of the rocks, the features of their mineral-phase assemblages, the compositional evolution of the minerals and the F–Ca phase are a consequence of the formation of the Ary-Bulak massif from ongonitic magma during a fluid-magmatic process complicated by fluoride–silicate liquid immiscibility with the participation of fluoritic and other fluoride melts, as well as magmatic fluids of P–Q and the first types.

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阿利-布拉克翁贡岩地块的岩石:地球化学特征、矿物相组合与形成过程之间的关系
本文报告了对阿利-布拉克缟玛瑙岩群岩石的地球化学、矿物相组合、主要矿物、次要矿物和附属矿物(石英、长石、黄玉、黝帘石、黝帘石、稀有钙铝氟化物、W-黝帘石、铌铁矿、锆石、锡石和萤石)的成分、氟钙(F-Ca)相以及由其形成的萤石的研究。斑状缟玛瑙岩的成岩矿物为石英、白云石和辉绿岩,次要矿物为黄玉和黝帘石。缟玛瑙基质由石英-闪锌矿-白云石集合体组成,其中有微米大小的针状黄玉晶体。在过渡斑岩和内接触斑岩区,基质矿物之间的间隙由 F-Ca(萤石质)化学熔体形成的 F-Ca 相填充。缟玛瑙岩浆中氟硅酸盐液体的不溶性和流体-岩浆过程导致了 REE、Y 和许多微量元素在熔体、流体、矿物之间的重新分布,以及岩石中矿物相组合的对比变化。这与岩石的软玉归一化REE模式中出现的M型(T1 La-Nd、T4 Er-Lu)和W型(T3 Gd-Ho)四元效应有关。岩浆流体通过内接触斑岩带时,伴随着含Sr的闪长岩和含水Ca-Al-氟化物的结晶。与斑状缟玛瑙岩和斑状过渡岩相比,斑岩富含H2O、Sr、Ba、Rb、Sn、W、Ta、Be、Zr、Hf、Sb、As、Sc,但Li、Pb、Zn、Y和REE含量较少。在岩浆流体对富含Ca和F的岩石的作用过程中,特别是在内生接触斑岩带,白云母部分或全部被F-Ca相和高岭石所取代,F-Ca相重结晶为不含微量元素的微米级计量萤石颗粒集合体。Rb-Cs 云母也结晶于黝帘石板条的边缘,其中铷含量最高的区域与阳离子关系为 Rb > K > Cs,可能是一种新矿物。岩石的地球化学性质、矿物相组合特征、矿物成分演变以及 F-Ca 相,都是阿利-布拉克岩块由翁贡岩岩浆在流体-岩浆过程中形成的结果,该过程因氟化物-硅酸盐液体不溶性而复杂,萤石熔体和其他氟化物熔体以及 P-Q 和第一类岩浆流体也参与其中。
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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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