Andradite-Morimotoite Garnets as Promising U-Pb Geochronometers for Dating Ultrabasic Alkaline Rocks

被引：20

作者：

Salnikova, E. B. ^{[1
]}

Stifeeva, M. V. ^{[1
]}

Nikiforov, A. V. ^{[2
]}

Yarmolyuk, V. V. ^{[2
]}

Kotov, A. B. ^{[1
]}

Anisimova, I. V. ^{[1
]}

Sugorakova, A. M. ^{[3
]}

Vrublevskii, V. V. ^{[4
]}

机构：

[1] Russian Acad Sci, Inst Precambrian Geol & Geochronol, St Petersburg 199034, Russia

[2] Russian Acad Sci, Inst Geol Ore Deposits Petrog Mineral & Geochem, Moscow 119017, Russia

[3] Russian Acad Sci, Siberian Branch, Tuva Inst Complex Explorat Nat Resources, Kyzyl 667007, Russia

[4] Natl Res Tomsk State Univ, Tomsk 634050, Russia

来源：

DOKLADY EARTH SCIENCES | 2018年 / 480卷 / 02期

基金：

俄罗斯科学基金会; 俄罗斯基础研究基金会;

关键词：

GEOCHRONOLOGY; EXTRACTION; URANIUM; AGE;

D O I：

10.1134/S1028334X18060168

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

U-Pb geochronological studies of garnet of the andradite-morimotoite series and Sm-Nd geochronological studies of this garnet and apatite from the Chikskii Massif (Tuva-Mongolia microcontinent) were carried out. The garnet studied is characterized by relatively high concentrations of U (14-16 ppm) and by a low level of common Pb (Pb-N/Pb-t = 0.07-0.1). The concordia age of garnet is 492 +/- 2 Ma (MSWD = 0.01, probability 92%) and matches within the error with the Sm-Nd age determined by the isochrone for apatite, garnet, and bulk rock (489 +/- 9 Ma, MSWD = 0.86). This allows us to consider calcic garnets of the andradite-morimotoite series as promising mineral geochronometers for U-Pb dating of ultrabasic alkaline rocks.

引用

页码：778 / 782

页数：5

共 12 条

[1] U-PB GARNET AND TITANITE AGE FOR THE BRISTOL TOWNSHIP LAMPROPHYRE SUITE, WESTERN ABITIBI SUBPROVINCE, CANADA
BARRIE, CT
[J]. CANADIAN JOURNAL OF EARTH SCIENCES, 1990, 27 (11) : 1451 - 1456
[2] U-Pb ages of the Dalsfjord Complex, SW Norway, and their bearing on the correlation of allochthonous crystalline segments of the Scandinavian Caledonides
Corfu, F
Andersen, TB
[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES, 2002, 91 (06) : 955 - 963
[3] The role of inclusions in U-Pb and Sm-Nd garnet geochronology: Stepwise dissolution experiments and trace uranium mapping by fission track analysis
DeWolf, CP
Zeissler, CJ
Halliday, AN
Mezger, K
Essene, EJ
[J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1996, 60 (01) : 121 - 134
[4] SEPARATION AND PRECONCENTRATION OF URANIUM FROM ACIDIC MEDIA BY EXTRACTION CHROMATOGRAPHY
HORWITZ, EP
DIETZ, ML
CHIARIZIA, R
DIAMOND, H
ESSLING, AM
GRACZYK, D
[J]. ANALYTICA CHIMICA ACTA, 1992, 266 (01) : 25 - 37
[5] Kononova V.A., 1957, IZV AN SSSR GEOL, P37
[6] LOW-CONTAMINATION METHOD FOR HYDROTHERMAL DECOMPOSITION OF ZIRCON AND EXTRACTION OF U AND PB FOR ISOTOPIC AGE DETERMINATIONS
KROGH, TE
[J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1973, 37 (03) : 485 - 494
[7] Ludwig K.R., 2012, BERKELEY GEOCHRONOLO, V5
[8] Ludwig K.R., 1991, 88542 US GEOL SURV
[9] APPROXIMATION OF TERRESTRIAL LEAD ISOTOPE EVOLUTION BY A 2-STAGE MODEL
STACEY, JS
KRAMERS, JD
[J]. EARTH AND PLANETARY SCIENCE LETTERS, 1975, 26 (02) : 207 - 221
[10] SUBCOMMISSION ON GEOCHRONOLOGY - CONVENTION ON USE OF DECAY CONSTANTS IN GEOCHRONOLOGY AND COSMOCHRONOLOGY
STEIGER, RH
JAGER, E
[J]. EARTH AND PLANETARY SCIENCE LETTERS, 1977, 36 (03) : 359 - 362

← 1 2 →