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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 >Relics of a complex triple junction in the Weddell Sea embayment, Antarctica
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Relics of a complex triple junction in the Weddell Sea embayment, Antarctica

机译：南极Weddell海堤中复杂的三重交界处的文物

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摘要

Interpretation of an airborne magnetic data compilation containing a key, new survey, together with re-tracked satellite gravity data from Weddell Sea embayment (WSE), West Antarctica, suggests Rift-Rift-Rift triple junction formation at the onset of Gondwana breakup in the Early Middle Jurassic. A complex system of northwest-southeast rifts was active contemporaneously with an east-west trending rift. This rift activity led to northward separation of the Falkland Plateau, and formation of the Weddell Sea by sea floor spreading. Atypically, the Jurassic passive margin of Gondwana shows evidence for coeval extension in two directions and a large volume of interpreted magmatic material. This is consistent with initial doming above a mantle plume and we suggest that this resulted in the formation of a triple junction. Magnetic anomalies indicate a series of faults perpendicular to igneous intrusions and extrusions with outlines that range in shape from lozenges to parallel ridges. They show remarkably good spatial correlation with free air gravity anomalies, even in areas of sea ice. We base a structural elements map and timing sequence for the events in the WSE during early Gondwana breakup on anomaly cross-cutting relationships.
机译：包含重要的新测量结果的机载磁数据汇编的解释，以及对来自南极西部韦德尔海堤（WSE）的卫星重力数据的重新追踪，表明在冈瓦纳断裂发生时裂谷-裂谷-裂谷三结形成。中侏罗纪早期。复杂的西北-东南裂谷系统同时活跃着东西向的裂谷。这种裂谷活动导致福克兰高原向北分离，并通过海床扩展形成了韦德尔海。非典型地，冈瓦纳的侏罗纪被动边缘显示了在两个方向上的同时期扩展和大量解释的岩浆物质的证据。这与地幔柱上方的初始隆隆相一致，我们建议这导致了三重结的形成。磁异常指示了一系列垂直于火成岩侵入的断层，其轮廓的形状范围从锭剂到平行隆起。它们显示出与自由空气重力异常非常显着的空间相关性，即使在海冰区域也是如此。我们根据异常横切关系，为冈萨瓦早期解体期间WSE中事件的结构要素图和时序安排奠定了基础。

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