Rb-Sr age and sequence of formation of granitoids of the Khorinka volcanoplutonic structure in the Mongolo-Transbaikalian belt

被引:0
|
作者
Posokhov, VF
Shadaev, MG
Litvinovsky, BA
Zanvilevich, AN
Khubanov, VB
机构
[1] RAS, Siberian Branch, Inst Geol, Ulan Ude 670047, Russia
[2] Ben Gurion Univ Negev, IL-84105 Beer Sheva, Israel
关键词
alkali granites; Rb; Sr age; Transbaikalia;
D O I
暂无
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Khorinka volcanoplutonic structure lies in the central part of the Mongolo-Transbaikalian alkali-granite belt (MTB) extending for more than 2500 km through Northern Mongolia and Transbaikalia. The MTB formed in two stages: 280-270 and 230-210 Ma. The Khorinka structure is ca. 3000 km(2) in area. Syenites and granites prevail at the modern denudation level of its rocks. Only a minor part of volcanic comagmates ( bimodal trachybasalt-rhyolite series) has been preserved in this structure. The volcanic stage was preceded by the formation of a bimodal dike belt. Granitoid massifs resulted from the subsequent intrusion of alkali-feldspathic, alkaline, and syenogranitic magmas. Rb-Sr isotope dating has shown that the Khorinka structure was produced at the early stage of the MTB formation (similar to 280 +/- 5 Ma). The Rb-Sr ages for alkali granitoids agree with the literature U-Pb zircon ages of these rocks. The (Sr-87/Sr-86)(0) value is 0.7073 in alkali and feldspathic granitoids and 0.7033 in syenogranites, which points to different sources of their parental acid magmas.
引用
收藏
页码:612 / 619
页数:8
相关论文
共 50 条
  • [1] Isotopic (Rb-Sr and K-Ar) age rocks of Mongolia-Transbaikalian volcanic belt
    Bulnaev, K.B.
    Posokhov, V.F.
    Doklady Akademii Nauk, 2002, 383 (05) : 665 - 668
  • [2] Isotopic (Rb-Sr and K-Ar) age of rocks from the Mongolian-Transbaikalian volcanic belt
    Bulnaev, KB
    Posokhov, VF
    DOKLADY EARTH SCIENCES, 2002, 383 (03) : 311 - 313
  • [3] RB-SR AGE OF THE AMANANSKY COMPLEX GRANITOIDS IN EAST TRANSBAIKALIA
    SOKOLOV, SY
    SMOLYAR, MI
    DOKLADY AKADEMII NAUK SSSR, 1990, 314 (04): : 954 - 957
  • [4] Rb-Sr constraints on the age of Moon formation
    Yobregat, Elsa
    Fitoussi, Caroline
    Bourdon, Bernard
    ICARUS, 2024, 420
  • [5] Rb-Sr age and geochemistry of intrusive granitoids in the Ufalei Zone (Southern Urals)
    Shardakova, GY
    Shagalov, ES
    Ronkin, YL
    Lepikhina, OP
    Popova, OY
    DOKLADY EARTH SCIENCES, 2005, 405 (09) : 1404 - 1407
  • [6] New Rb-Sr data on the age of Late Paleozoic granitoids in Western Transbaikalia
    Litvinovsky, BA
    Posokhov, VE
    Zanvilevich, AN
    GEOLOGIYA I GEOFIZIKA, 1999, 40 (05): : 694 - 702
  • [7] The new Rb-Sr data on age of phanerozoic granitoids Upper Priamur'e
    Moiseenko, VG
    Strikha, VE
    Shergina, YP
    DOKLADY AKADEMII NAUK, 2000, 370 (03) : 360 - 364
  • [8] Rb-Sr isochron ages of the Cretaceous granitoids in the Ryoke belt, Kinki district, Southwest Japan
    Morioka, K
    Tainosho, Y
    Kagami, H
    ISLAND ARC, 2000, 9 (01) : 46 - 54
  • [9] Isotopic Rb-Sr age of the pseudoleucite tilaite in the Uralian Platinum Belt
    Pushkarev, EV
    Fershtater, GB
    Bea, F
    Montero, P
    Scarrow, J
    DOKLADY EARTH SCIENCES, 2003, 388 (01) : 97 - 100
  • [10] The Khailama and Aryskan Massifs of Alkali Granitoids, Eastern Sayan: Age and formation conditions by Rb-Sr isotopic and geochemical data
    Kostitsyn, YA
    Altukhov, EN
    GEOCHEMISTRY INTERNATIONAL, 2004, 42 (03) : 195 - 204