Sm-Nd and Rb-Sr ages of gabbroids, granitoids, and titanomagnetite ores from layered intrusions of the Kusa-Kopan Complex (South Urals)

Kholodnov, V. V.; Ферштатер, Г. Б.; Ronkin, Yu. L.; Borodina, N. S.; Прибавкин, С. В.; Lepikhina, O. P.

doi:10.1134/s1028334x10060048

Cited by 8 publications

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“…Nd and Sr isotopic data on the rocks of the Kusa intrusion and associated grani La n Th n × ( )) toids are reported in the work (Kholodnov et al, 2010). Sr-Nd-Pb isotope systematics of the Ber dyaush pluton is reported in the works (Larin, 2011;Ronkin et al, 2006).…”

Section: Sm-nd and Rb-sr Isotope Characteristics Of The Rocksmentioning

confidence: 88%

“…This work is based on the results of chemical and mineral study of basitepicritic rocks from subvolcanic and plutonic bodies of the province (Fig. 1), which are repported in this paper (see Tables 3-8 below), as well as were published in our previous works (Nosova et al, 2010, Sazonova et al, 2010 and in the works of other researchers (Ernst et al, 2006(Ernst et al, , 2008Savel'ev et al, 2009;Kholodnov et al, 2010).…”

Section: Introductionmentioning

confidence: 90%

“…The age range of the Mashak volcanics deter mined by different methods varies between 1385 ± 1-1388 ± 28 Ma (Kholodnov et al, 2006;Ronkin, 2008), while U-Pb CA ID TIMS zircon determina tions for the Mashak Formation yielded 206 Pb/ 207 Pb age of 1381 ± 0.7 Ma (Puchkov et al, 2009). The gab bronorites of the Kusa Massif define the Sm-Nd age of 1388 ± 62 Ma, while the granitoids of the Gubensky and Ryabinovsky massifs have Rb-Sr ages of 1389 ± 10 and 1394 ± 6 Ma, respectively (Kholodnov et al, 2010), which coincide with the zircon age of these granitoids (Krasnobaev et al, 2006). Close ages of 1386 ± 10 Ma and 1369 ± 13 Ma were also obtained for gabbros and granites, respectively, of the Berdyaush pluton (Ronkin et al, 2006).…”

Section: Brief Geological Review and Age Relations Of The Rocksmentioning

confidence: 97%

“…For instance, initial isotopic ratios were preserved in the granitoids of the Ryabinovsky and Gubensky massifs (Kholodnov et al, 2010), whole rock samples for which define isochron dependences corresponding to ages of 1394 and 1389 Ma with ( 87 Sr/ 86 Sr) Т = 0.7055 and 0.7057, respectively. (Sun, 1982;Sun and McDonough, 1989).…”

Section: Sm-nd and Rb-sr Isotope Characteristics Of The Rocksmentioning

confidence: 99%

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Mesoproterozoic within-plate igneous province of the western urals: Main petrogenetic rock types and their origin

et al. 2012

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The Mesoproterozoic (1.38-1.30 Ga) Kama-Belsk igneous province (KBP) was formed at the eastern margin of the East European Platform (EEP), in the Volga-Ural area and Bashkirian anticlinorium. It is made up of plutonic, volcanic, and subvolcanic (numerous dike and sill swarms) rocks of bimodal com position. KBP, as most of large igneous provinces, contains two geochemical types of basites: high titanium (HTi) rocks with TiO 2 > 1.5 wt % and low titanium (LTi) rocks with TiO 2 < 1.5-2.0 wt %. They demonstrate zoned distribution, were derived from different mantle sources at different regimes of their partial melting. The high and low titanium basites significantly differ in geochemical and isotopic (Sr, Nd, O) parameters. The HTi rocks are characterized by Ti/Y > 400, (Gd/Yb) n = 1.62-4.08, (Dy/Yb) n = 1.31-2.43; Nb/Nb* from 0.5 to 1.3, while the LTi rocks have Ti/Y < 400, (Gd/Yb) n = 1.23-1.51, (Dy/Yb) n = 1.01-1.26, and Nb/Nb* from 0.3 to 0.9. The HTi rocks have ε Nd (T) from + 1.3 to -2.4, while the LTi rocks are characterized by ε Nd (T) from + 0.5 to -6.1. The oxygen isotopic composition δ 18 O is 5.0-5.9‰ in the LTi rocks and 7.0‰ in the HTi picrobasalts. According to obtained estimates, the parental melts for the LTi type (Mg# = 0.76) are comparable with high Mg primary melts inferred for within plate picrites. The parental melts for the HTi type (Mg# = 0.69) had higher Fe contents, which in combination with lowered Al 2 O 3 and elevated TiO 2 , Na 2 O, and P 2 O 5 make these rocks similar to ferropicrites. The HTi melts were presumably derived by partial melting of a pyroxenite in equilibrium with garnet bearing residue, whereas the LTi melts were generated from peridotite protolith and left spinel bearing residuum. Both the varieties of the basites were contaminated mainly by Paleoproterozoic crustal material.

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Section: Sm-nd and Rb-sr Isotope Characteristics Of The Rocksmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 90%

Section: Brief Geological Review and Age Relations Of The Rocksmentioning

confidence: 97%

Section: Sm-nd and Rb-sr Isotope Characteristics Of The Rocksmentioning

confidence: 99%

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Mesoproterozoic within-plate igneous province of the western urals: Main petrogenetic rock types and their origin

et al. 2012

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“…The Kusa-Kopan group of intrusions has been recently studied in great detail using the isotope method [Kholodnov et al, 2006[Kholodnov et al, , 2010Kholodnov, Shagalov, 2012;etc.]. The isotopic age data obtained with U-Pb, Sm-Nd, and Rb-Sr methods indicate that the ages of ore-bearing gabbroids of the Kusa-Kopan group and the Gubenka and Ryabinovka granite massifs overlying them in the east, lie in the same range of 1385-1395 Ma.…”

Section: рис 4 диаграммы харкера для габброидов и дайковых пород бмаmentioning

confidence: 99%

The Riphean Magmatism Preceding the Opening of Uralian Paleoocean: Geochemistry, Isotopes, Age, and Geodynamic Implications

Kholodnov¹,

Шардакова²,

Ферштатер³

et al. 2018

Geodin. tektonofiz.

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Abstract:The rocks from different stages of the geodynamic evolution have been preserved in the Urals. In its geologic history, the least studied is the transition period between continental rifting and the beginning of oceanic spreading. This article presents the geochemical data on the Sr-, Nd-isotopes, zircon U-Pb (SHRIMP) ages for the MesoNeoproterozoic igneous rocks and associated ores from the Bashkir meganticlinorium (BMA) on the Urals western slope. A Large Igneous Province (LIP) formed there as a result of mantle plume activity during the Middle Riphean (1380-1350 Ma). Later on (1200-1100 Ma), short-term rifting took place, as evidenced by the Nazyam graben, which was followed by the complete break-up of the continental crust. For magmatic rocks in the age range of 1750-1200 Ma, the evolition of chemical composition OIB-type → E-MORB →N-MORB is observed. The εNd(t) values for the igneous rocks and the associated BMA ores vary from negative (-6) to positive ones (+5), and thus give evidence of the lithosphere mantle depletion with time. These facts and the Sr-isotope ratios for the magmatic rocks from the subsequent evolution stages confirm that the oceanic basin to the east of the East European platform started to open at the end of the Middle Riphean. For the Vendian-Cambrian, some traces of orogenes (Timanian stage) are observed. The development of the Uralian Paleozoic ocean started in the Ordovican and continued up to the Late CarboniferousPermian.Key words: geochemistry; Sr-and Nd-isotopes; dike swarms; Riphean; intra-plate rifting; Urals Аннотация: Урал -одна из немногих структур, в которой сохранились породы всех стадий геодинамической эволюции. Наименее изученным в его геологической истории является период, переходный от континен-тального рифтинга к океаническому спредингу. В статье представлены новые данные по геохимии, изотопии Sr и Nd, U-Pb (SHRIMP) возрасту цирконов магматических пород и связанных с ними руд Башкирского меган-тиклинория (западный склон Южного Урала), имеющих мезонеопротерозойский возраст. В среднем рифее (1380-1350 млн лет) здесь была сформирована крупная изверженная провинция (LIP) как возможный ре-зультат активности мантийного плюма. Затем (около 1100 млн лет) имел место полный разрыв континен-тальной коры, и краткое время существовала рифтовая структура (Назямский грабен). Для магматических пород с возрастом 1750-1100 млн лет фиксируется геохимическая эволюция составов: OIB →E-MORB→ N-MORB. При этом εNd изменяется от отрицательных (-6) до положительных значений (+5), указывая на обеднение литосферной мантии со временем. Эти факты, наряду с поведением изотопов Sr для пород всех последующих стадий эволюции Урала, указывают на то, что океаническое пространство к востоку от Восточ-но-Европейской платформы открылось в конце среднего рифея. В венде -кембрии присутствуют признаки орогенных событий (Тиманский этап). С ордовика началось развитие Уральского палеозойского океана, су-ществовавшего до верхнего карбона -ранней перми. GEODYNAMICS & TECTONOPHYSICS P U B L I S H E D B Y T...

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Geochemistry and isotopic ages of granitoids of the Bashkirian Mega-Anticlinorium: Evidence for several pulses of tectono–magmatic activity at the junction zone between the Uralian orogen and East European Platform

Shardakova

2016

Geochem. Int.

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Sm-Nd and Rb-Sr ages of gabbroids, granitoids, and titanomagnetite ores from layered intrusions of the Kusa-Kopan Complex (South Urals)

Cited by 8 publications

References 0 publications

Mesoproterozoic within-plate igneous province of the western urals: Main petrogenetic rock types and their origin

Mesoproterozoic within-plate igneous province of the western urals: Main petrogenetic rock types and their origin

The Riphean Magmatism Preceding the Opening of Uralian Paleoocean: Geochemistry, Isotopes, Age, and Geodynamic Implications

Geochemistry and isotopic ages of granitoids of the Bashkirian Mega-Anticlinorium: Evidence for several pulses of tectono–magmatic activity at the junction zone between the Uralian orogen and East European Platform

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