메뉴 건너뛰기




Volumn 304, Issue 5674, 2004, Pages 1126-1129

Coeval large-scale magmatism in the Kalahari and Laurentian cratons during Rodinia assembly

Author keywords

[No Author keywords available]

Indexed keywords

GEOMAGNETISM; IGNEOUS ROCKS; TECTONICS;

EID: 2442704022     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1096329     Document Type: Article
Times cited : (175)

References (54)
  • 12
    • 2442644675 scopus 로고    scopus 로고
    • note
    • Materials and methods are available as supporting material on Science Online.
  • 13
    • 2442672292 scopus 로고    scopus 로고
    • note
    • 206Pb date of 1109.6 ± 0.6 Ma (Fig. 1).
  • 20
    • 2442707238 scopus 로고    scopus 로고
    • unpublished data
    • S. A. Bowring, unpublished data.
    • Bowring, S.A.1
  • 28
    • 2442715842 scopus 로고    scopus 로고
    • note
    • In the absence of an independent polarity constraint, the near-zero inclination of the Umkondo magnetization direction, resulting from the equatorial position of Kalahari ∼1100 Ma, permits either polarity assignment and makes it possible to rotate Kalahari by 180° without shifting its latitudinal position.
  • 31
    • 0023691713 scopus 로고
    • M. Gurnis, Nature 332, 695 (1988).
    • (1988) Nature , vol.332 , pp. 695
    • Gurnis, M.1
  • 47
    • 2442650961 scopus 로고    scopus 로고
    • note
    • For the Midcontinent rift, we used the average of the published poles for the Logan sills, Coldwell Complex, Powder Mill Group, and North Shore Volcanic Group (16, 21), which have yielded U-Pb crystallization ages of 1107.9 ± 1.8 to 1108 ± 1 Ma (14, 36, 37). The position of this average pole is 49.1°N, 209.2°E, with a radius for the 95% circle of confidence of 7.7°. Aligning this pole and the mean Umkondo pole places the two cratons ∼3000 km apart. The separation could be decreased by ∼1700 km if the extreme limits of the error circles for the poles were used.
  • 54
    • 2442686169 scopus 로고    scopus 로고
    • note
    • We thank G. Brandl for advice on sample sites in South Africa; T. Machacha (Director) and T. Najaule, Botswana Geological Survey, for permission to sample borehole cores from the Xade Complex; B. Vink and M. Wendorff for assistance in Botswana; F. Venter for permission to sample in Kruger National Park, South Africa, and J. Venter for assistance in the park; and A. Maloof for discussions of paleomagnetic data. Supported by NSF grant nos. EAR-9909269 (R.E.H.) and EAR-9909854 (I.W.D.D. and W.A.G.), and EAR-9526702 (S.A.B.), and by the Tectonics Special Research Centre, University of Western Australia (I.W.D.D.). This paper is dedicated to the memory of H. Munyanyiwa, who first pointed out to us the potential significance of the Umkondo sills in eastern Zimbabwe.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.