Kinematic reconstruction of the Caribbean region since the Early Jurassic
Kinematic reconstruction of the Caribbean region since the Early Jurassic
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DOI：
10.1016/j.earscirev.2014.08.007
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发表时间：
2014-11-01
影响因子：
12.1
通讯作者：
Pindell, James L.
中科院分区：
文献类型：
--
作者：
Boschman, Lydian M.;van Hinsbergen, Douwe J. J.;Pindell, James L.
加勒比洋壳形成于北美和南美大陆以西，可能从晚侏罗世到早白垩世。其后续演化源于复杂的构造历史，受北美、南美和（古）太平洋板块相互作用的控制。在其整个构造演化过程中，加勒比板块大部分被俯冲带和转换边界所环绕，自约9000万年前以来，洋壳一直被加勒比大火成岩省（CLIP）覆盖。因此，被动大陆边缘的缺失和可测量的海洋磁异常的缺乏阻碍了其在板块运动全球回路中的定量整合。在此，我们提出了一个更新的、定量描述的加勒比地区追溯到20000万年前的运动学重建，将其整合到全球板块回路中，并使用GPlates免费软件实现。我们的重建包括用欧拉极和有限旋转角来描述构造单元。我们对加勒比构造演化的分析包含了广泛的文献综述。为了确定加勒比板块在美洲大陆之间的运动，我们采用了一种新方法，该方法将构造地质观测而非海洋磁异常作为主要输入，并使用区域广泛的变质和岩浆现象，如加勒比大弧、CLIP和加勒比高压带作为相关标志。由此产生的模型使加勒比板块沿着开曼海槽以及危地马拉、尼加拉瓜近海、伯利兹近海和安第斯山脉北部的主要走滑断层恢复到其起源位置，即早白垩世时北美和南美大陆以西。我们通过将全球视极移曲线旋转到加勒比板块内部、古巴和乔蒂斯地块的坐标中，为加勒比地区提供了古地磁参考框架。我们得出结论，由于泛大洋/太平洋扩张，加勒比板块在北美和南美以西的形成导致了一种比原加勒比/大西洋扩张简单得多的板块运动学情景。将我们的重建置于最新的地幔参考框架中表明，CLIP起源于现代加拉帕戈斯热点以东2000 - 3000公里处，可能并非来自相应的地幔柱。最后，我们的重建表明，加勒比板块周围的大多数（如果不是全部）现代俯冲带始于转换断层，其中两个（沿着墨西哥南部和南美洲西北边缘）由于海沟 - 海沟 - 转换三联点的迁移而不同时演化。（C）2014爱思唯尔公司。保留所有权利。
The Caribbean oceanic crust was formed west of the North and South American continents, probably from Late Jurassic through Early Cretaceous time. Its subsequent evolution has resulted from a complex tectonic history governed by the interplay of the North American, South American and (Paleo-)Pacific plates. During its entire tectonic evolution, the Caribbean plate was largely surrounded by subduction and transform boundaries, and the oceanic crust has been overlain by the Caribbean Large Igneous Province (CLIP) since similar to 90 Ma. The consequent absence of passive margins and measurable marine magnetic anomalies hampers a quantitative integration into the global circuit of plate motions. Here, we present an updated, quantitatively described kinematic reconstruction of the Caribbean region back to 200 Ma, integrated into the global plate circuit, and implemented with GPlates free software. Our reconstruction includes description of the tectonic units in terms of Euler poles and finite rotation angles. Our analysis of Caribbean tectonic evolution incorporates an extensive literature review. To constrain the Caribbean plate motion between the American continents, we use a novel approach that takes structural geological observations rather than marine magnetic anomalies as prime input, and uses regionally extensive metamorphic and magmatic phenomena such as the Great Arc of the Caribbean, the CLIP and the Caribbean high-pressure belt as correlation markers. The resulting model restores the Caribbean plate back along the Cayman Trough and major strike-slip faults in Guatemala, offshore Nicaragua, offshore Belize and along the Northern Andes towards its position of origin, west of the North and South American continents in Early Cretaceous time. We provide the paleomagnetic reference frame for the Caribbean region by rotating the Global Apparent Polar Wander Path into coordinates of the Caribbean plate interior, Cuba, and the Chortis Block. We conclude that formation of the Caribbean plate, west of the North and South Americas, as a result of Panthalassa/Pacific spreading leads to a much simpler plate kinematic scenario than Proto-Caribbean/Atlantic spreading. Placing our reconstruction in the most recent mantle reference frames shows that the CLIP originated 2000-3000 km east of the modern Galapagos hotspot, and may not have been derived from the corresponding mantle plume. Finally, our reconstruction suggests that most if not all modern subduction zones surrounding the Caribbean plate initiated at transform faults, two of these (along the southern Mexican and NW South American margins) evolved diachronously as a result of migrating trench-trench-transform triple junctions. (C) 2014 Elsevier B.V. All rights reserved.