Neodymium isotope constraints on the tectonic evolution of East Gondwana

N.B.W. Harris , J.M. Bartlett , M. Santosh
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引用次数: 50

Abstract

East Gondwana incorporates a collage of polymetamorphic terrains with long-lived tectonic histories from the Early Archaean to the Neoproterozoic. The oldest cratonic areas have been identified in South India (north of the Palghat-Cauvery shear zone) and East Antarctica (the Napier Complex). These terrains are remnants of an East Gondwana craton that underwent initial crustal growth during the Early Archaean and granulite-facies metamorphism at ∼2.5 Ga. Both were virtually unaffected by the Pan-African orogeny (1.1-0.5 Ga). In contrast, Proterozoic terrains were subject to high-grade metamorphism during the Pan-African event. On the basis of published Nd model ages, a direct correlation can be made between southern Madagascar (south of the Ranotsara shear zone), southern India (the Madurai Block and Kerala Khondalite Belt) and the Highland/Southwestern Complex of Sri Lanka, which comprise a Later Archaean-Palaeoproterozoic (3.2-2.0 Ga) mobile belt that may extend eastwards into East Antarctica. The youngest period of crustal growth in East Gondwana has been recognised at 1.5-0.8 Ga from isotopic studies of the Mozambique Belt of East Africa, the Vijayan Complex of Sri Lanka and the Yamato-Belgica Complex/Sør Rondane Mountains of East Antarctica. Small slivers of terrain of intermediate age (1.9-1.2 Ga) have been recognised in South India (Achankovil metasediments) and Sri Lanka (Wanni Complex) that may represent mixed-age contributions to clastic sedimentary basins.

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东冈瓦纳构造演化的钕同位素约束
东冈瓦纳融合了多变质地形的拼贴,具有从早太古宙到新元古代的漫长构造历史。最古老的克拉通区已经确定在南印度(Palghat-Cauvery剪切带以北)和东南极洲(Napier杂岩)。这些地形是东冈瓦纳克拉通的遗迹,该克拉通在早太古代经历了最初的地壳生长和~ 2.5 Ga的麻粒岩相变质作用。两者几乎都没有受到泛非造山运动(1.1-0.5 Ga)的影响。而在泛非事件中,元古宙地形则发生了高变质作用。根据已发表的Nd模式年龄,可以在马达加斯加南部(Ranotsara剪切带以南)、印度南部(Madurai地块和Kerala Khondalite带)和斯里兰卡高地/西南杂岩之间建立直接的相关性,它们构成了一个可能向东延伸至南极洲东部的晚太古宙-古元古代(3.2-2.0 Ga)活动带。根据对东非莫桑比克带、斯里兰卡的Vijayan杂岩和东南极洲的Yamato-Belgica杂岩/Sør Rondane山脉的同位素研究,东冈瓦纳最年轻的地壳生长期被认为是1.5-0.8 Ga。在南印度(Achankovil变质沉积)和斯里兰卡(Wanni杂岩)发现了中间时代(1.9-1.2 Ga)的小条状地形,可能代表了碎屑沉积盆地的混合时代贡献。
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