U-Pb dating of prograde and retrograde titanite growth during the Scandian orogeny

被引:0
|
作者
Essex, RM [1 ]
Gromet, LP [1 ]
机构
[1] Brown Univ, Dept Geol Sci, Providence, RI 02912 USA
关键词
caledonides; metamorphism; Scandian; titanite; U/Pb;
D O I
10.1130/0091-7613(2000)028<0419:UPDOPA>2.3.CO;2
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
U/Pb ages of metamorphic titanite from high-grade gneisses of the Nasafjallet window in the north-central Scandinavian Caledonides record growth over an similar to 20 m.y. interval during the Late Silurian to Early Devonian, Biotite-amphibolite gneisses located near the basement-cover boundary contain metamorphic titanite in two microtextural settings, one as lenticular grains distributed throughout a recrystallized matrix of metamorphic phases, and one as plate-like grains enclosed within biotite grains. These distinct morphological populations exhibit core-overgrowth relationships with compositionally similar cores and overgrowths, but the plate-like titanite grains have a moth higher proportion of overgrowth and give slightly younger ages. Cores and overgrowths in both types are inferred to have formed along the prograde (ca. 413 Ma) and retrograde (ca. 395 Ma) paths, respectively, of a single metamorphic cycle associated with the burial and exhumation of a slice of Baltic basement during the Caledonide orogeny (Baltica-Laurentia collision), The existence of polygenic U/Pb systematics in metamorphic titanite demonstrates the potential usefulness of titanite to reveal multiple metamorphic and deformational episodes, and to constrain the duration of metamorphic events.
引用
收藏
页码:419 / 422
页数:4
相关论文
共 50 条
  • [41] Titanite and monazite U-Pb dating of high-grade metamorphism and extensional denudation in the mid-Scandinavian Caledonides
    Bingen, B
    Davis, WJ
    Osmundsen, PT
    GEOCHIMICA ET COSMOCHIMICA ACTA, 2005, 69 (10) : A27 - A27
  • [42] Paleocene metamorphism along the Pennine-Austroalpine suture constrained by U-Pb dating of titanite and rutile (Malenco, Alps)
    Picazo, Suzanne M.
    Ewing, Tanya A.
    Muentener, Othmar
    SWISS JOURNAL OF GEOSCIENCES, 2019, 112 (2-3) : 517 - 542
  • [43] U-Pb DATING OF HYDROTHERMAL TITANITE RESOLVES MULTIPLE PHASES OF PROPYLITIC ALTERATION IN THE OYU TOLGOI PORPHYRY DISTRICT, MONGOLIA
    Hart-Madigan, Lisa
    Wilkinson, Jamie J.
    Lasalle, Stephanie
    Armstrong, Robin N.
    ECONOMIC GEOLOGY, 2020, 115 (08) : 1605 - 1618
  • [44] Geochemical characteristics, U-Pb dating of hydrothermal titanite from the Xingfengshan tungsten deposit in Hunan Province and their geological significance
    Lv YuanJun
    Peng JianTang
    Cai YaFei
    ACTA PETROLOGICA SINICA, 2021, 37 (03) : 830 - 846
  • [45] Palaeoproterozoic assembly of the Sao Francisco craton, SE Brazil: New insights from U-Pb titanite and monazite dating
    Aguilar, Carmen
    Alkmim, Fernando F.
    Lana, Cristiano
    Farina, Federico
    PRECAMBRIAN RESEARCH, 2017, 289 : 95 - 115
  • [46] Sm-Nd and U-Pb systematics of single titanite grains
    Amelin, Yuri
    CHEMICAL GEOLOGY, 2009, 261 (1-2) : 52 - 60
  • [47] U-Pb discordance in titanite and the interpretation of the thermal history of metamorphic rocks
    Davis, WJ
    McNicoll, VJ
    GEOCHIMICA ET COSMOCHIMICA ACTA, 2005, 69 (10) : A26 - A26
  • [48] Zircon U-Pb dating on fluid mobility during UHP rock exhumation
    Zheng, YF
    Wu, YB
    Bing, G
    GEOCHIMICA ET COSMOCHIMICA ACTA, 2003, 67 (18) : A582 - A582
  • [49] LA-ICPMS common Pb corrected U-Th-Pb dating of titanite
    Storey, CD
    Jeffries, T
    Smith, M
    GEOCHIMICA ET COSMOCHIMICA ACTA, 2004, 68 (11) : A60 - A60
  • [50] Thrusting and extension in the scandian hinterland, Norway: New U-Pb ages and tectonostratigraphic evidence
    Tucker, RD
    Robinson, P
    Solli, A
    Gee, DG
    Thorsnes, T
    Krogh, TE
    Nordgulen, O
    Bickford, ME
    AMERICAN JOURNAL OF SCIENCE, 2004, 304 (06) : 477 - 532