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首页> 外文会议>International Symposium on the Jurassic Boundary Events and the Annual Symposium of the International Geoscience Program IGCP 506: Marine and Non-Marine Jurassic; 20051101-04; Nanjing(CN) >The Triassic-Jurassic boundary in the Middle Eastern Levant: The magmatic event
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The Triassic-Jurassic boundary in the Middle Eastern Levant: The magmatic event

机译：中东黎凡特的三叠纪-侏罗纪边界：岩浆事件

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摘要

The Asher Volcanism (207—189 Ma) represents a significant magmatic event, which since recent radiometric data, seem to straddle the Triassic/Jurassic boundary. Extending from the Mediterranean coast, across Galilee to Mount Hermon, the unusually thick volcanic sequence is interstratified with Late Triassic limestone and Early Jurassic shale. The event unfolded during an active phase of continental breakup in Gondwana, with the volcanism contemporaneous with the regional uplift of the Arabian Plate that caused denudation of the Triassic substratum, and sealed by a marked angular unconformity and development of laterites. A deep chasm filled with vol-canics runs along an old NW-SE fault system characterizing the Arabian Plate and nearly perpendicular to the NE-SW Palmyrid aulacogen, which relates to an aborted breakaway of the Syrian promontory from mainland Gondwana. The volume of Asher volcanics may also reflect the role of volcanism in the T/J mass-extinction as proposed in 2004.
机译：灰烬火山活动（207-189 Ma）代表着重大的岩浆事件，自最近的辐射测量数据以来，似乎跨越了三叠纪/侏罗纪边界。从地中海沿岸延伸，穿过加利利到赫尔蒙山，异常厚厚的火山岩层与晚三叠世石灰岩和侏罗纪早期页岩交错。该事件在冈瓦纳大陆解体的活跃阶段进行，火山活动与阿拉伯板块的区域隆升同时发生，造成了三叠纪基底的剥蚀，并被明显的角不整合和红土的发育所封闭。充满火山作用的深裂缝沿着古老的NW-SE断层系统延伸，该断层系统具有阿拉伯板块的特征，并且几乎垂直于NE-SW Palmyrid aulacogen，这与叙利亚海角从冈瓦纳大陆的中止脱离有关。 Asher火山的数量也可能反映出2004年提议的T / J大规模灭绝中火山作用。

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