克利高地(大高加索地区)含奥苏门岩的熔岩:岩石学和地球化学特征、矿物成分及熔融生成条件

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
E. N. Kaigorodova, V. A. Lebedev, P. M. Kartashov, E. V. Kovalchuk, A. V. Chugaev
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The petrographic and microprobe analysis showed that the rocks contain three paragenetic mineral associations: (1) “xenogenic” (metamorphic) association consisting of garnet (<i>X</i><sub><i>Prp</i></sub> = 0.42, <i>X</i><sub><i>Alm</i></sub> = 0.51–0.53, <i>X</i><sub><i>Grs</i></sub> = 0.04–0.05) + hercynite + sapphire + bronzite + pargasite + ilmenite; (2) early magmatic association represented by hypersthene + hercynite + garnet (<i>X</i><sub><i>Prp</i></sub> = 0.21–0.31, <i>X</i><sub><i>Alm</i></sub> = 0.52–0.71, <i>X</i><sub><i>Grs</i></sub> = 0.04–0.13) + ferro-kaersutite + ilmenite; (3) late magmatic association including hypersthene-ferrohypersthene + labradorite + garnet (<i>X</i><sub><i>Prp</i></sub> = 0.04–0.14, <i>X</i><sub><i>Alm</i></sub> = 0.65–0.81, <i>X</i><sub><i>Grs</i></sub> = 0.06–0.18) + osumilite-(Mg) + phlogopite + tridymite + ilmenite + apatite. The osumilite-(Mg) (phenocrysts, xenomorphic aggregates in the rock matrix, and crystals in miarolic cavities), the average formula for dacites of Kordieritoviy Volcano can be written as (K<sub>0.73</sub>Na<sub>0.06</sub>Ca<sub>0.02</sub><span>\\({{\\square }_{{0.20}}}\\)</span>)<sub>1.00</sub>(Mg<sub>1.06</sub><span>\\({\\text{Fe}}_{{{\\text{0}}{\\text{.90}}}}^{{{\\text{2 + }}}}\\)</span>Mn<sub>0.04</sub>)<sub>2.00</sub>(Al<sub>2.75</sub><span>\\({\\text{Fe}}_{{{\\text{0}}{\\text{.18}}}}^{{{\\text{2 + }}}}{\\text{Fe}}_{{{\\text{0}}{\\text{.06}}}}^{{{\\text{3 + }}}}\\)</span>Ti<sub>0.01</sub>)<sub>3.00</sub>(Si<sub>10.34</sub>Al<sub>1.66</sub>)<sub>12</sub>O<sub>30</sub>, formed mainly at late magmatic stages – in intermediate chambers immediately prior to the rise of the melt to the surface or after its eruption. Accordingly, this mineral in the studied lavas has a purely magmatic origin. 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It includes several stages: (1) formation of an enriched upper-mantle source (lithospheric mantle metasomatized by permanent interaction at the Moho discontinuity with the overlying lower crust composed of metamorphosed terrigenous-volcanogenic complexes); (2) generation of “dry” basaltic magmas in the source; (3) crystallization differentiation in the source (fractionation of olivine and chromium spinels) with the formation of a “dry” overheated andesitic melt; (4) limited-scale assimilation of the lower crustal material made up of leucocratic granulites by highly differentiated andesitic melts rising to the surface, with simultaneous fractionation of garnet, orthopyroxene and ilmenite from the melt.</p></div>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":null,"pages":null},"PeriodicalIF":1.0000,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Osumilite-Bearing Lavas of the Keli Highland (Greater Caucasus): Petrological and Geochemical Characteristics, Mineral Composition, and Conditions of Melt Generation\",\"authors\":\"E. 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引用次数: 0

摘要

本文报告了对更新世末期(约 200 ka)喷发的 Kordieritoviy 火山(大高加索地区克利高地)含奥陶系安山岩-闪长岩熔岩进行的岩石学、地球化学和矿物学综合研究。岩相学和微探针分析表明,这些岩石包含三种副成因矿物组合:(1)由石榴石(XPrp = 0.42,XAlm = 0.51-0.53,XGrs = 0.04-0.05)+绿帘石+蓝宝石+青铜矿+副榴辉石+钛铁矿组成的 "异生"(变质)组合;(2)以超榍石+绿帘石+石榴石为代表的早期岩浆组合(XPrp = 0.21-0.31,XAlm = 0.52-0.71,XGrs = 0.04-0.13)+铁闪长岩+钛铁矿;(3)晚期岩浆关联,包括超辉石-铁闪长岩+拉长石+石榴石(XPrp = 0.04-0.14,XAlm = 0.65-0.81,XGrs = 0.06-0.18)+黝帘石-(镁)+辉石+闪长岩+钛铁矿+磷灰石。鲕粒-(镁)(岩石基质中的表晶、异形集合体和鲕粒洞中的晶体),科尔杰里托维火山的白云母平均公式可写成(K0.73Na0.06Ca0.02\({{\square }_{{0.20}}}\))1.00(Mg1.06\({\text{Fe}}_{{{\text{0}}{\text{.90}}}}^{{{\text{2 + }}}}\)Mn0.04)2.00(Al2.75\({\text{Fe}}_{{{\text{0}}{\text{.18}}}}^{{{\text{2 + }}}}{\text{Fe}}_{{{\text{0}}{\text{.06}}}}^{{{\text{3 + }}}}\)Ti0.01)3.00(Si10.34Al1.66)12O30,主要形成于岩浆晚期--熔体上升到地表之前或喷发之后的中间腔。因此,所研究熔岩中的这种矿物纯粹是岩浆形成的。热压计算和岩石学模型显示,科尔杰里托维火山的深岩浆室位于莫霍不连续面附近 45-53 千米深处。早期岩浆阶段的熔体温度不低于 1100°C,压力为 17-23 千巴。在中间岩浆室(30-40 千米深处)和熔岩喷出过程中,奥苏米特-(镁)的结晶温度为 1030-870°C,压力从 14-9 千巴逐渐下降到 1 千巴。已经提出了一个岩石成因模型来解释科尔杰里托维火山奇特的含奥苏门岩熔岩的成因。该模型包括几个阶段(1) 形成一个富集的上地幔源(岩石圈地幔在莫霍不连续处与由变质的原生火山复合体组成的上覆下地壳永久性相互作用而变质);(2) 在该源中生成 "干 "玄武岩浆;(3) 源内结晶分异(橄榄石和铬尖晶石的分馏),形成 "干 "过热安山岩熔体; (4) 高度分异的安山岩熔体上升到地表,对由白云母花岗岩组成的下地壳物质进行有限规模的同化,同时从熔体中分馏出石榴石、正长石和钛铁矿。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Osumilite-Bearing Lavas of the Keli Highland (Greater Caucasus): Petrological and Geochemical Characteristics, Mineral Composition, and Conditions of Melt Generation

Osumilite-Bearing Lavas of the Keli Highland (Greater Caucasus): Petrological and Geochemical Characteristics, Mineral Composition, and Conditions of Melt Generation

Osumilite-Bearing Lavas of the Keli Highland (Greater Caucasus): Petrological and Geochemical Characteristics, Mineral Composition, and Conditions of Melt Generation

The paper reports comprehensive petrological, geochemical and mineralogical studies of osumilite-bearing andesite-dacitic lavas of Kordieritoviy Volcano (Keli Highland, Greater Caucasus) erupted at the end of the Pleistocene (about 200 ka). The petrographic and microprobe analysis showed that the rocks contain three paragenetic mineral associations: (1) “xenogenic” (metamorphic) association consisting of garnet (XPrp = 0.42, XAlm = 0.51–0.53, XGrs = 0.04–0.05) + hercynite + sapphire + bronzite + pargasite + ilmenite; (2) early magmatic association represented by hypersthene + hercynite + garnet (XPrp = 0.21–0.31, XAlm = 0.52–0.71, XGrs = 0.04–0.13) + ferro-kaersutite + ilmenite; (3) late magmatic association including hypersthene-ferrohypersthene + labradorite + garnet (XPrp = 0.04–0.14, XAlm = 0.65–0.81, XGrs = 0.06–0.18) + osumilite-(Mg) + phlogopite + tridymite + ilmenite + apatite. The osumilite-(Mg) (phenocrysts, xenomorphic aggregates in the rock matrix, and crystals in miarolic cavities), the average formula for dacites of Kordieritoviy Volcano can be written as (K0.73Na0.06Ca0.02\({{\square }_{{0.20}}}\))1.00(Mg1.06\({\text{Fe}}_{{{\text{0}}{\text{.90}}}}^{{{\text{2 + }}}}\)Mn0.04)2.00(Al2.75\({\text{Fe}}_{{{\text{0}}{\text{.18}}}}^{{{\text{2 + }}}}{\text{Fe}}_{{{\text{0}}{\text{.06}}}}^{{{\text{3 + }}}}\)Ti0.01)3.00(Si10.34Al1.66)12O30, formed mainly at late magmatic stages – in intermediate chambers immediately prior to the rise of the melt to the surface or after its eruption. Accordingly, this mineral in the studied lavas has a purely magmatic origin. Thermobarometric calculations and petrological modeling showed that the deep magma chamber of Kordieritoviy Volcano was located at a depth of 45–53 km near the Moho discontinuity. The temperature of the melt at the early magmatic stage was no less than 1100°C at 17–23 kbar. Crystallization of osumilite-(Mg) in intermediate magmatic chambers (at depths of 30–40 km) and during the lava ejection occurred at 1030–870°C and pressure progressively decreasing from 14–9 to 1 kbar. A petrogenetic model has been proposed to explain the genesis of exotic osumilite-bearing lavas of Kordieritoviy Volcano. It includes several stages: (1) formation of an enriched upper-mantle source (lithospheric mantle metasomatized by permanent interaction at the Moho discontinuity with the overlying lower crust composed of metamorphosed terrigenous-volcanogenic complexes); (2) generation of “dry” basaltic magmas in the source; (3) crystallization differentiation in the source (fractionation of olivine and chromium spinels) with the formation of a “dry” overheated andesitic melt; (4) limited-scale assimilation of the lower crustal material made up of leucocratic granulites by highly differentiated andesitic melts rising to the surface, with simultaneous fractionation of garnet, orthopyroxene and ilmenite from the melt.

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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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