Discovery of Miocene to early Pleistocene deposits on Mayaguana, Bahamas: Evidence for recent active tectonism on the North American margin
Discovery of Miocene to early Pleistocene deposits on Mayaguana, Bahamas: Evidence for recent active tectonism on the North American margin
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巴哈马马亚瓜纳发现中新世至早更新世沉积物：北美边缘近期活跃构造运动的证据
DOI：
10.1130/g32011.1
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发表时间：
2011
期刊：
影响因子：
5.8
通讯作者：
E. Samankassou
中科院分区：
文献类型：
--
作者：
P. Kindler;Fabienne Godefroid;M. Chiaradia;C. Ehlert;A. Eisenhauer;M. Frank;C. Hasler;E. Samankassou
我们在这里报告了在马亚瓜纳岛(巴哈马东南部)发现的中新世、上新世和早更新世浅海碳酸盐，这些碳酸盐迄今在任何其他巴哈马群岛上都没有发现。这一地层序列跨度超过17米，厚12米，只出现在岛的北部海岸，表明马亚瓜纳浅滩在整个晚新生代都经历了轻微的下沉，并在第四纪向南倾斜。除了显著扩展巴哈马群岛的地层记录外，我们的发现还表明，这些碳酸盐河岸在新近纪期间处于不同的海拔和不同的下沉速度。在马亚瓜纳发现的倾斜事件的年轻年龄进一步表明，北美东南边缘的部分地区最近在距离其与加勒比板块的实际边界很远的地方经历了构造活动。
We report here the discovery of Miocene, Pliocene, and early Pleistocene shallow-marine carbonates on Mayaguana Island (southeastern Bahamas) that have so far not been observed on any other Bahamian island. Spanning more than 17 m.y., but <12 m thick, this stratigraphic succession only occurs along the northern coast of the island, indicating that the Mayaguana Bank underwent minor subsidence throughout the late Cenozoic and was tilted toward the south during the Quaternary. In addition to considerably extending the stratigraphic record of the Bahamas Islands, our findings demonstrate that these carbonate banks were at different elevations and subsided at different rates during the Neogene. The young age of the tilting event detected on Mayaguana further shows that parts of the southeastern margin of North America have recently undergone tectonic activity a long way from its actual boundary with the Caribbean plate.