Growth of Archaean crust within the western gneiss terrain, Yilgarn Block, Western Australia
作者: Malcolm T. McCullochKenneth D. CollersonWilliam Compston
作者单位: 1Research School of Earth Sciences, Australian National University, Canberra, A.C.T.
刊名: Australian Journal of Earth Sciences, 1983, Vol.30 (1-2), pp.155-160
来源数据库: Taylor & Francis Journal
DOI: 10.1080/00167618308729243
关键词: Archaean orthogneissesWestern Gneiss TerrainYilgarn Block W.ASm-NdU-Pbzircon agemigmatitegranitecrustal growth
原始语种摘要: Two groups of Archaean orthogneisses from the Western Gneiss Terrain, approximately 100 km east of Perth, Western Australia, give Nd model ages of 3150 Ma to 3240 Ma, and 2950 Ma to 3050 Ma respectively. A Sm-Nd whole-rock isochron of 3210 ± 190 Ma (2σ), obtained by including a mafic granulite with samples having the older group of model ages, is in close agreement with U-Pb zircon ages of Nieuwland & Compston (1981). This agreement, together with a chondritic initial 143Nd/144Nd, indicates a limited prior crustal residence time (<200 Ma) for the gneiss protoliths. Leucosome and melanosome components of nearby migmatite yield significantly younger Nd model ages of 2860 Ma and 2660 Ma, respectively. Post-tectonic granites also give younger model ages of 2770 Ma and 2680 Ma, consistent with...
全文获取路径: Taylor & Francis  (合作)
影响因子:1.468 (2012)

  • crust 外壳
  • gneiss 片麻岩
  • Australia 澳大利亚
  • within 在以内
  • terrain 地形
  • western 谓的
  • Growth 生长