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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Deep crustal structure of the Chicxulub impact crater
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Deep crustal structure of the Chicxulub impact crater

机译：Chicxulub撞击坑的深壳结构

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We present the results of a wide-angle seismic survey conducted over the Chicxulub. impact crater. Profile Chicx-A/A1 is a chord across the offshore portion of the crater, and Chicx-B/F is an onshore-offshore profile through the center of the crater. We use travel times recorded by 32 ocean bottom seismograph and 19 land-based receivers to model the crustal structure of the crater. The primary feature in the shallow velocity structure is a low-velocity Tertiary basin, the edge of which correlates with a steep gravity gradient in some regions of our survey. Directly beneath the Tertiary basin at the center of the crater is a region of relatively low velocities and densities that is interpreted as a unit of melt rocks (either suevite breccias with isolated melt pods or suevite breccias overlying a coherent melt sheet). This unit has a thickness of similar to1 km and a diameter of similar to 100 km. Central uplift with a diameter of 40-60 km is observed on Chicx-B/F. A lower limit on the vertical extent of uplift is 9 km. Shallow basement is also observed along the northwest portion of Chicx-B/F, associated with a prominent northwest trending high in the gravity field. Superimposed on a regional trend is Moho uplift of similar to1 km near the center, of the Chicx-A/A1 profile, with adjacent Moho deepening of similar to1.25-1.5 km. The Moho topography may be related to deformation. processes associated with the formation of the outer ring or to the excavation and collapse of the transient cavity. [References: 37]
机译：我们介绍了对Chicxulub进行的广角地震调查的结果。撞击坑。轮廓Chicx-A / A1是横跨火山口近海部分的弦，而Chicx-B / F是穿过火山口中心的陆上-海上轮廓。我们使用32个海底地震仪和19个陆基接收器记录的旅行时间来模拟火山口的地壳结构。浅层速度结构的主要特征是低速第三纪盆地，其边缘与我们调查的某些地区的陡峭重力梯度相关。在火山口中心的第三纪盆地的正下方，是一个速度和密度相对较低的区域，被解释为熔岩的一个单元（具有孤立熔体荚的苏维岩角砾岩或上覆连贯的熔体片的苏维岩角砾岩）。该单元的厚度近似于1 km，直径近似于100 km。在Chicx-B / F上观测到直径40-60 km的中央隆升。垂直隆起的下限为9 km。在Chicx-B / F的西北部也观察到浅层基底，这与重力场中的西北高趋势有关。与区域趋势叠加的是，Chicx-A / A1剖面中心附近的Moho隆起接近1 km，而相邻的Moho隆起也接近1.25-1.5 km。 Moho形貌可能与变形有关。与外圈的形成或瞬态腔的开挖和坍塌有关的过程。 [参考：37]

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