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PKP Metadata Items |
Metadata for this Document |
| 1. |
Title |
Title of document |
Sources of the melts of Quaternary hauyne alkaline basaltoids in the Lesser Caucasus. communication 1. geochemical and isotope (Sr–Nd–Pb) data |
| 2. |
Creator |
Author's name, affiliation, country |
S. N. Bubnov; Institute of Geology of ore Deposits, Petrography, Geochemistry, and Mineralogy RAS; Russian Federation |
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Creator |
Author's name, affiliation, country |
Yu. V. Goltsman; Institute of Geology of ore Deposits, Petrography, Geochemistry, and Mineralogy RAS; Russian Federation |
| 2. |
Creator |
Author's name, affiliation, country |
I. A. Kondrashov; Institute of Geology of ore Deposits, Petrography, Geochemistry, and Mineralogy RAS; Russian Federation |
| 2. |
Creator |
Author's name, affiliation, country |
T. I. Oleinikova; Institute of Geology of ore Deposits, Petrography, Geochemistry, and Mineralogy RAS; Russian Federation |
| 2. |
Creator |
Author's name, affiliation, country |
A. Ya. Dokuchaev; Institute of Geology of ore Deposits, Petrography, Geochemistry, and Mineralogy RAS; Russian Federation |
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Subject |
Discipline(s) |
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| 3. |
Subject |
Keyword(s) |
Lesser Caucasus; neovolcanic center; hauyne basanites; ordanshites; isotope geochemistry; petrology; mantle and crustal sources |
| 4. |
Description |
Abstract |
The first ever detailed data are obtained on the Sr–Nd–Pb isotope systematics and geochemistry of Quaternary intraplate hauyne basanites and ordanshites in the Lesser Caucasus. The parental magmas of the rocks were found out to have been generated by mixing material from at least two regional sources: one relatively depleted and the other significantly enriched in incompatible elements. One of these sources of the hybrid magmas was most likely a mildly depleted regional plume–asthenospheric source of the CAUCASUS OIB type, whose isotopic-geochemical signatures were close to those of the COMMON and PREMA mantle reservoirs. The other source of the material for the rocks was relatively enriched in radiogenic Sr and Pb and depleted in radiogenic Nd and was most probably enriched subcontinental lithospheric mantle of the EM II type. |
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Publisher |
Organizing agency, location |
The Russian Academy of Sciences |
| 6. |
Contributor |
Sponsor(s) |
Ministry of Science and Higher Education of the Russian Federation (075-00350-24-00)
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| 7. |
Date |
(DD-MM-YYYY) |
18.12.2024
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Type |
Status & genre |
Peer-reviewed Article |
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Type |
Type |
Research Article |
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Format |
File format |
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| 10. |
Identifier |
Uniform Resource Identifier |
https://journals.eco-vector.com/0203-0306/article/view/685208 |
| 10. |
Identifier |
Digital Object Identifier (DOI) |
10.31857/S0203030624060065 |
| 10. |
Identifier |
eLIBRARY Document Number (EDN) |
HYXITF |
| 10. |
Identifier |
Digital Object Identifier (DOI) (PDF (Rus)) |
10.31857/S0203-03062024655-79-200072 |
| 11. |
Source |
Title; vol., no. (year) |
Вулканология и сейсмология; No 6 (2024) |
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Language |
English=en |
ru |
| 13. |
Relation |
Supp. Files |
Fig. 1. Schematic geological map of the manifestations of Quaternary magmatism of the Kapan volcanic center in the south of Armenia (compiled on the basis of data from [Shirinyan, Nagapetyan, 1974] with additions by the authors). (97KB) doi: 10.31857/S0203-03062024655-79-4346429
Fig. 2. The end of the Quaternary Khalaj lava flow of hauyne basanites above the village of Syunik. The left photo is a general view of the frontal part of the lava flow; the right photo is a detail of the frontal part of the flow. (48KB) doi: 10.31857/S0203-03062024655-79-4346430
Fig. 3. Groundmass structures and indicator minerals of ordanshites (a) and basanites (b) of the Kapan neovolcanic center of the Lesser Caucasus in backscattered electrons (BSE). Amp – amphibole, Ol – olivine, Cpx – clinopyroxene, Pl – plagioclase, Hyn – hauyne. (90KB) doi: 10.31857/S0203-03062024655-79-4346431
Fig. 4. SiO2–(K2O+Na2O) diagram [Le Bas et al., 1986] for Quaternary alkaline basaltoids of the Kapan center of the Lesser Caucasus. Green diamonds are Hyn-Ol basanites, gray circles are Hyn-Amp tephrites (ordanshites). (40KB) doi: 10.31857/S0203-03062024655-79-4346432
Fig. 5. Discrimination diagrams [Pearce, Cann, 1973; Pearce, Norry, 1979] for the newest Hyn-bearing alkaline basaltoids of the Kapan volcanic center. A – IAT; B ‒ IAT, CAB, MORB; C – CAB; D – WPB. IAT – island arc tholeiites MORB – mid-ocean ridge basalts, CAB – calc-alkaline basalts; WPB – within-plate basalts, IAB – island arc basalts. See Fig. 4 for legend. (24KB) doi: 10.31857/S0203-03062024655-79-4346433
Fig. 6. Lead isotope compositions in the newest Hyn-bearing alkaline basaltoids of the Kapan volcanic center on uranogenic and torogenic diagrams. Green diamonds – Hyn-Amp basanites; gray circles – Hyn-Amp tephrites (ordanshites); light green triangles down – rocks of the Variscan granite-metamorphic crust of the Greater Caucasus; purple triangles – subduction-related rocks of the Jurassic-Paleogene igneous complexes of the basement of the Kapan zone, after [Mederer et al., 2013]; oblique crosses – products of activity of the Elbrus neovolcanic center (Greater Caucasus); straight crosses – products of activity of the Kazbek neovolcanic center (Greater Caucasus); star – mantle source “Caucasus” [Lebedev et al., 2010]. Fields of mantle source compositions ‒ [Zindler, Hart, 1986], young igneous rocks of the Arabian Plate and adjacent territories ‒ [Keskin et al., 2012]. Isotopic compositions of lavas of the Elbrus, Kazbek centers and rocks of the Variscan basement of the Greater Caucasus ‒ [Lebedev et al., 2010, 2016; Chugaev et al., 2013]. NHRL is a correlation line of lead isotopic composition of oceanic basalts of the Northern Hemisphere [Hart, 1984]. (122KB) doi: 10.31857/S0203-03062024655-79-4346434
Fig. 7. Variation diagrams of Pb isotope ratios and MgO contents in alkaline basaltoids of the Kapan center of the Lesser Caucasus. See Fig. 4 for legend. The error in the diagrams corresponds to 2ϭ. (26KB) doi: 10.31857/S0203-03062024655-79-4346435
Fig. 8. Ta/Yb−Th/Yb diagram [Pearce, 1983] for Quaternary alkaline basaltoids of the Kapan center (Lesser Caucasus). FC and AFC vectors ‒ [Neill et al., 2013]. Average compositions of E-MORB, N-MORB, OIB, PM and UC reservoirs ‒ [Sun, McDonough, 1989; Taylor, McLennan, 1988]. See Fig. 4 for legend. (14KB) doi: 10.31857/S0203-03062024655-79-4346436
Fig. 9. Multielement and REE diagrams for alkaline basaltoids of the Kapan center of the Lesser Caucasus. Element concentrations are normalized to the primitive mantle (according to [Sun, McDonough, 1989]), REE – to chondrite (according to [Sun, McDonough, 1989]). (36KB) doi: 10.31857/S0203-03062024655-79-4346437
Fig. 10. Nb/Y−Zr/Y diagram [Fitton et al., 1997; Condie, 2005] for Quaternary alkaline basaltoids of the Kapan center of the Lesser Caucasus. IAB — island arc basalts, OIB — ocean island basalts, OFB — ocean floor basalts. Composition fields of different types of basaltoids ‒ according to [Condie, 2005]. Average compositions of N-MORB, primitive mantle (PM), chondrite (C1) ‒ according to [Sun, McDonough, 1989] and continental crust ‒ according to [Rudnick, Gao, 2003]. See Fig. 4 for legend. (13KB) doi: 10.31857/S0203-03062024655-79-4346438
Fig. 11. The ratio of Sr and Nd isotope compositions in the newest alkaline basaltoids of the Kapan volcanic region. The thick blue line is the mantle correlation line. Green diamonds are Hyn-Ol basanites; gray circles are Hyn-Amp tephrites (ordanshites); purple triangles are sedimentation-related rocks of the Jurassic-Paleogene igneous complexes of the basement of the Kapan zone [Mederer et al., 2013]. Mantle sources of magmas are designated by Latin letters and words [Zindler, Hart, 1986; Wörner et al., 1986; Faure, 2000; Hart, 1988; Stein, Hofmann, 1994; Hofmann, 1997; [Lebedev et al., 2010 and others]: BMOR – mid-ocean ridge basalt; PM – primitive (undepleted) mantle; Common – “ordinary” mantle; EM I – enriched mantle I; EM II – enriched mantle II; PREMA – statistically dominant mantle; “Caucasus” – regional “dominant” mantle source of the Caucasus segment of the Alpine fold belt. 1–4 ‒ mixing lines of BSOR-type magma (εNd = 10; Nd = 7 g/t; 87Sr/86Sr = 0.7025; Sr = 130 g/t) with different reservoirs (for the present-day state): 1 ‒ lower crust (εNd = –10; Nd = 30 g/t; 87Sr/86Sr = 0.710; Sr = 400 g/t [Kempton et al., 1990; Schaaf et al., 1994]); 2 ‒ middle‒upper continental crust (εNd = –26; Nd = 32 g/t; 87Sr/86Sr = 0.717; Sr = 510 g/t [Azbel, Tolstikhin, 1990]); 3 — average composition of the Variscan granite-metamorphic crust of the Greater Caucasus (εNd = –12; Nd = 30 g/t; 87Sr/86Sr = 0.730; Sr = 140 g/t [Lebedev et al., 2010]); 4 ‒ enriched mantle-II (εNd = –0.89; Nd = 1.14 g/t; 87Sr/86Sr = 0.70755; Sr = 20 g/t [Hofmann, 1997; Workman et al., 2004; Jackson, Dasgupta, 2008 and others]); 5–8 ‒ mixing lines of the modern statistically dominant mantle PREMA (εNd = 7.06; Nd = 1.366 g/t; 87Sr/86Sr = = 0.7035; Sr = 21.1 g/t) with different reservoirs (for the modern state): 5 ‒ lower crust [Kempton et al., 1990; Schaaf et al., 1994]; 6 ‒ middle‒upper continental crust [Azbel, Tolstikhin, 1990]; 7 — average composition of the Variscan granite-metamorphic crust of the Greater Caucasus [Lebedev et al., 2010]; 8 — enriched mantle II [Hofmann, 1997; Workman et al., 2004; Jackson, Dasgupta, 2008, etc.]; 9–11 — mixing lines of “Caucasus” — the regional “predominant” mantle source of the Caucasus segment of the Alpine fold belt (εNd = 4.1; Nd = 35 g/t; 87Sr/86Sr = 0.7041; Sr = 800 g/t) [Lebedev et al., 2010, etc.] with different reservoirs (for the modern state): 9 — lower crust [Kempton et al., 1990; Schaaf et al., 1994]; 10 — average composition of the Variscan granite-metamorphic crust of the Greater Caucasus [Lebedev et al., 2010]; 11 — enriched mantle II [Workman et al., 2004; Jackson, Dasgupta, 2008, etc.]. (20KB) doi: 10.31857/S0203-03062024655-79-4346439
Fig. 12. The ratio of Pb and Sr isotopic compositions in Hyn-bearing alkaline basaltoids of the Kapan neovolcanic center of the Lesser Caucasus. The diagram shows the Pb and Sr isotopic compositions of the mantle reservoirs DMM, EM II, PREMA, HIMU, “Caucasus” [Zindler, Hart, 1986; Hofmann, 1997; Lebedev et al., 2010, etc.]. See Fig. 4 for legend. (14KB) doi: 10.31857/S0203-03062024655-79-4346440
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Coverage |
Geo-spatial location, chronological period, research sample (gender, age, etc.) |
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Rights |
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Copyright (c) 2024 Russian Academy of Sciences
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