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首页> 外文期刊>Precambrian Research >A 1.88 Ga giant radiating mafic dyke swarm across southern India and Western Australia
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A 1.88 Ga giant radiating mafic dyke swarm across southern India and Western Australia

机译：1.88 Ga Giant在印度南部和西澳大利亚散发散发Mafic Dyke Swarm

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Baddeleyite from a mafic dyke near Bhanupratappur of the central Bastar Craton (India) yielded a weighted mean Pb-207/Pb-206 age of 1882.4 +/- 1.5 Ma. The dykes are tholeiitic and have variable Mg# (41-60), TiO2 (0.83-1.74 wt%) and low CaO ( 10.9 wt%) indicating they are not representative of primary melts and differentiated prior to or during emplacement. Petrological modeling shows that the chemical variability of the dykes is primarily due to crystal fractionation and crustal contamination. The Sr and Nd isotopes (Sr-87/Sr-86(i) = 0.7032-0.7068; epsilon(Nd)(t) = 1.1 to +1.7) are variable but broadly chondritic. Trace element modeling suggests the dykes were likely derived by partial melting of a mantle source from the spinet-garnet transition zone. The dykes from the central Bastar Craton have the same age and are chemically similar to NW trending dykes and sills from the southern Bastar Craton (1883.0 +/- 1.4 Ma; 1883.5 +/- 4.4 Ma; 1885.4 +/- 3.1 Ma) and dykes from the Yilgarn Craton (1888 +/- 9) of Western Australia. The similar age, complimentary orientations and geochemistry of the dykes from the Bastar and Yilgarn Cratons supports the notion that Southern India and Western Australia were once connected during the Paleoproterozoic and separated by -1.88 Ga.
机译：来自中央巴斯塔尔·克拉顿（印度）的Bhanupratappur附近的MAFIC Dyke的Baddeleyite产生了加权平均值PB-207 / PB-206岁1882.4 +/- 1.5 mA。染料是烟虫，具有可变的Mg＃（41-60），TiO 2（0.83-1.74wt％）和低CaO（10.9wt％），表明它们不代表初级熔化并在施加之前分化。岩石造型模型表明，堤坝的化学变异主要是由于晶体分馏和地壳污染。 SR和ND同位素（SR-87 / SR-86（i）= 0.7032-0.7068;ε（Nd）（t）= 1.1至+1.7）是可变的，但宽泛的软骨质。痕量元素建模表明堤坝可能是通过从尖刻 - 石榴石过渡区的碎屑源的部分熔化来源的。来自中央巴斯塔尔·克拉顿的堤坝年龄同期，与南方巴斯塔尔·克拉顿的NW趋势戴克斯和门槛化学相似（1883.0 +/- 1.4 ma; 1883.5 +/- 4.4 ma; 1885.4 +/- 3.1 ma）和堤防来自西澳大利亚州西澳大利亚伊莱克纳克朗（1888年+/- 9）。巴斯塔尔和伊莱尔恩克拉托斯迪卡斯的年龄，互联网和地球化学的年龄相似，支持印度南部和西澳大利亚曾经在古普罗佐的曾经连接过的概念并分开了-1.88克。

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