克列斯托夫斯卡亚岩体含蒙地长辉石岩:熔融包裹体研究的成因

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2023-03-21 DOI:10.1134/S0869591123010071
L. I. Panina, A. T. Isakova, E. Yu. Rokosova
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引用次数: 0

摘要

对克列斯托夫斯卡亚侵入岩的蒙长石和橄榄石-蒙长石岩石的研究表明,其主要矿物(橄榄石和蒙长石)的MgO含量高于侵入岩的橄榄岩和孔德岩中的相同矿物。研究岩石中橄榄石的Fo含量为90 ~ 93 mol %, monticellite的Fo含量为41.6 ~ 42.3 mol %,而橄榄岩中的橄榄石和铜榴石中的monticellite的Fo含量分别为86 ~ 87和37.2 ~ 41.2 mol %。蒙脱石岩石矿物熔体包裹体研究表明,Krestovskaya岩体的蒙脱石岩石是由富钾高铁低铝马马辉石熔体和富钠高镁高铝苦辉石熔体这两种不同组成的富挥发物混合形成的。矿物在高温下的结晶顺序如下:钙钛矿I(1250 ~ 1230℃)→钙钛矿II(≥1200℃)↔橄榄石(>1200℃)→蒙蒂石(>1150℃)。钙钛矿I和橄榄石中的橄榄石由富钾高铁(Mg# = MgO/(MgO + FeO) = 0.37)、低铝马马辉石熔体结晶而成。钙钛矿II型晚期钙钛矿在蒙脱石中结晶过程中,熔体中MgO (Mg# = 0.41)含量增加,Na2O和Al2O3含量增加,介于卡玛辉石和碱苦铁铁矿之间。monticellite岩石中的橄榄石是由组成类似于melmelite的熔体结晶而成,具有富k组成,Mg# = 0.39,而monticellite则是由非均质高Mg si欠饱和熔体结晶而成,其挥发性成分(包括H2O)和盐高度富集。矿物结晶过程伴随着挥发性组分在混合熔体中的积累,在1250 ~ 1190℃范围内硅酸盐-碳酸盐液体不混相,在1190℃以下范围内碳酸盐-盐多相不混相。在后一种情况下,溶解的碳酸盐熔体开始分裂成更简单的不可混溶的部分:碱-硫酸盐-碳酸盐、碱-磷酸盐-碳酸盐和碳酸钙。
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The Monticellite-bearing Rocks of the Krestovskaya Intrusion: Genesis according to Melt Inclusion Study

The investigation of monticellitolites and olivine–monticellite rocks from the Krestovskaya Intrusion shows that the major minerals (olivine and monticellite) have higher MgO content than the same minerals in olivinites and kugdites of the intrusion. In the studied rocks olivine contains 90–93 mol % Fo and monticellite has 41.6–42.3 mol % Fo, whereas olivine and monticellite in olivinites and kugdites contain 86–87 and 37.2–41.2 mol % Fo, respectively. Melt inclusion study in minerals of monticellite rocks demonstrates that the monticellite rocks of the Krestovskaya Intrusion were formed by mixing of volatile-rich melts of different composition: K-rich high-iron low-alumina kamafugitic melt and Na-rich high-magnesium high-alumina picritic melt. Minerals crystallized at high temperatures in the following sequence: perovskite I (1250–1230°C) → perovskite II (≥1200°C) ↔ olivine (>1200°C) → monticellite (>1150°C). Perovskite I in monticellite rocks, as well as olivine in olivinites, crystallized from K-rich high-iron (Mg# = MgO/(MgO + FeO) = 0.37), low-alumina kamafugitic melt. During crystallization of late perovskite II in the monticellite rocks, the melt became more enriched in MgO (Mg# = 0.41) and richer in Na2O and Al2O3, which is intermediate in composition between kamafugite and alkali picrite. Olivine in the monticellite rocks crystallized from melts similar in composition to melilitite, having a K-rich composition with Mg# = 0.39, whereas monticellite formed from a heterogeneous high-Mg Si-undersaturated melt, which is highly enriched with volatile components (including H2O) and salts. The crystallization of minerals was accompanied by subsequent accumulation of volatile components in mixing melts, silicate–carbonate liquid immiscibility under 1250–1190°C, and polyphase carbonate–salt immiscibility under below 1190°C. In the latter event, the exsolved carbonate melt began to split into simpler immiscible fractions: alkali–sulfate–carbonate, alkali–phosphate–carbonate, and calcio–carbonate.

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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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