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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Crustal structure based on gravity-magnetic modelling constrained from seismic studies under Lambert Rift, Antarctica and Godavari and Mahanadi rifts, India and their interrelationship
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Crustal structure based on gravity-magnetic modelling constrained from seismic studies under Lambert Rift, Antarctica and Godavari and Mahanadi rifts, India and their interrelationship

机译：基于重力磁模型的地壳结构受印度Lambert Rift，南极洲和Godavari和Mahanadi裂谷的地震研究的约束及其相互关系

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摘要

Modelling of gravity and magnetic anomalies along selected profiles across the Lambert Glacier, Antarctica constrained from the results of deep seismic sounding (DSS) along a profile provide: (i) 6-7 km thick sediments of low density (2.35 g/cm~3) which represent Permian-Triassic sediments as they are exposed along the margins of this basin; (ii) high density (2.75 g/cm~3) and high susceptibility rocks with a stable natural magnetization of 0.025-0.035 gauss as the basement; (iii) a high density body (2.80 g/cm~3) along the western shoulder which may represent mid crustal granulite and charnockite rocks exposed in the Prince Charles mountains; (iv) a thin crust of 25 km with a high density (3.05 g/cm~3) and high velocity underplated lower crust. These signatures suggest that the Lambert Rift and the Amery ice shelf represent an active continental rift valley with signatures of magmatism. The adjoining Prydz Bay basin along the east coast of Antarctica is also characterized by 5-6 km thick Permian-Triassic-Cretaceous sediments with seaward dipping reflectors of basic volcanic rocks. The Godavari and the Mahanadi Gondwana rift valleys of almost same period and length (500-600 km) across the east coast of India are also characterized by Permian-Triassic-Cretaceous sediments of almost same density and thickness. The Mahanadi Basin depicts a thin crust (33-34 km) with a high density (3.00 g/cm~3) underplated lower crust similar to the Lambert Rift and a low density (2.65 g/cm~3) layer in the upper crust. It indicates substantial rift magmatism in the coastal part of the Mahanadi Basin and adjoining continental shelf which forms a part of the Early Cretaceous volcanic province of East India. As the east coast of India and Antarctica were juxtaposed together at the time of evolution of these rift valleys, the above similarities between them might be due to their common heritage. The signatures of magmatism in the Lambert Rift of Antarctica and the Mahanadi Basin of India indicate that the thermal source at the time of their evolution was located under the eastern part of East Antarctica which might be responsible for its uplift supplying sediments of same provenance and fossil record in these basins.
机译：沿南极兰伯特冰川沿选定剖面进行的重力和磁异常建模，受沿剖面进行深地震测（DSS）的结果约束，可以提供：（i）6-7公里厚的低密度沉积物（2.35 g / cm〜3） ）代表沿该盆地边缘暴露的二叠纪-三叠纪沉积物; （ii）高密度（2.75 g / cm〜3）和高磁化率岩石，其稳定的自然磁化强度为0.025-0.035高斯。 （iii）沿西肩的高密度物体（2.80 g / cm〜3），可能代表了查尔斯王子山中裸露的中地壳花岗石和夏诺克岩; （iv）厚度为25 km的薄壳，密度高（3.05 g / cm〜3），下覆壳的下层带速较高。这些特征表明兰伯特裂谷和阿默里冰架代表着活跃的大陆裂谷，具有岩浆作用。沿南极东海岸的毗邻的Prydz湾盆地还具有5-6公里厚的二叠纪-三叠纪-白垩纪沉积物，其基础火山岩向海浸入反射器。印度东部沿海地区的戈达瓦里和马哈纳迪·冈瓦纳裂谷几乎相同的时期和长度（500-600 km），其特征还在于密度和厚度几乎相同的二叠纪-三叠纪-白垩纪沉积物。 Mahanadi盆地的地壳很薄（33-34 km），与兰伯特裂谷相似，下地壳的高密度（3.00 g / cm〜3），而上地壳的密度低（2.65 g / cm〜3） 。它表明在马哈纳迪盆地的沿海地区以及毗邻的陆架上有大量裂谷岩浆活动，而陆架是早白垩纪东印度火山省的一部分。在这些裂谷形成时，印度东海岸和南极洲并列在一起，它们之间的上述相似之处可能是由于它们的共同遗产。南极兰伯特裂谷和印度马哈纳迪盆地的岩浆作用标志表明，它们演化时的热源位于东南极洲的东部，这可能是其隆升的原因，它提供了相同来源和化石的沉积物在这些盆地中记录。

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