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The Cuban staircase sequences of coral reef and marine terraces: A forgotten masterpiece of the Caribbean geodynamical puzzle
Marine Geology ( IF 2.9 ) Pub Date : 2021-07-31 , DOI: 10.1016/j.margeo.2021.106575
Leandro Peñalver 1 , Kevin Pedoja 2 , Denyse Martin-Izquierdo 1 , Christine Authemayou 3 , Arelis Nuñez 1 , Denovan Chauveau 3 , Gino de Gelder 4 , Pedro Davilan 5 , Laurent Husson 4
Affiliation  

The emerged sequences of coral reef and marine terraces of the Cuban Archipelago have been recognized since the end of the 19th century but with noticeable exceptions, their bio-constructions and/or deposits are not dated. The northern Caribbean islands and associated archipelagos are located in a left-lateral strike-slip tectonic setting, at the boundary between the North America and Caribbean plates. Cuba is the only landmass located on the American Plate directly adjacent to this transform fault zone. Quantifying upper Pleistocene coastal uplift is thus key to elucidate the recent vertical deformation of the Caribbean geodynamic puzzle with regards to the active tectonic segmentation of this area. We compiled bibliographic data and present new measurements concerning the Cuban sequences of coral reef and marine terraces; maximum elevations, minimum number of successive strandlines and elevation of the lowermost terrace. The Cuban Archipelago exhibits five main uplifting coastal stretches separated by subsiding areas, with at least 23 emerged staircase sequences of coastal terraces. At four sites, the lowest coral reef terrace has been previously correlated to the Last Interglacial Maximum (MIS 5e, 122 ± 6 ka). At nine sites, we extended the morpho-stratigraphy to derive Upper Pleistocene apparent and eustasy-corrected uplift rates. Alongshore Cuba, MIS 5e coastal terraces and associated shoreline angles occur at elevations ranging from 7 m to 40 m, yielding eustasy-corrected uplift rates ranging from 0.06 ± 0.01 mm.yr−1 (NW Cuba) to 0.33 ± 0.01 mm.yr−1 (SE Cuba). More than 400 km northward of the transform fault, eustasy-corrected uplift rates (0.13 mm.yr−1) suggest that the whole Cuban Archipelago is affected by the North America/Caribbean plate motion, with a partitioned compressive component resulting in block tectonics with tilting controlled by regional faults.



中文翻译:

古巴珊瑚礁和海洋阶地的阶梯序列:加勒比地球动力学谜题中被遗忘的杰作

自 19 世纪末以来,古巴群岛的珊瑚礁和海洋阶地的出现序列已被确认,但除了明显的例外,它们的生物构造和/或沉积物没有过时。加勒比北部岛屿和相关群岛位于北美和加勒比板块之间的左侧走滑构造环境中。古巴是美国板块上唯一一个与这个转换断层带直接相邻的陆地。因此,量化上更新世海岸隆起是阐明加勒比地球动力学谜题最近与该地区活动构造分割有关的垂直变形的关键。我们汇编了书目数据,并提出了有关古巴珊瑚礁和海洋阶地序列的新测量结果;最大海拔,最小连续股线的数量和最低阶地的高度。古巴群岛有五个主要的抬升海岸线,被下沉区隔开,至少有 23 个出现的海岸阶地阶梯序列。在四个地点,最低的珊瑚礁阶地先前与最后一次间冰期最大值(MIS 5e,122 ± 6 ka)相关。在九个地点,我们扩展了形态地层学,以推导出上更新世的表观抬升率和经eustasy 校正的抬升率。在古巴沿岸,MIS 5e 沿海阶地和相关的海岸线角度发生在 7 m 到 40 m 的海拔高度,产生了 0.06 ± 0.01 mm.yr 的eustasy 校正的抬升率 古巴群岛有五个主要的抬升海岸线,被下沉区隔开,至少有 23 个出现的海岸阶地阶梯序列。在四个地点,最低的珊瑚礁阶地先前与最后一次间冰期最大值(MIS 5e,122 ± 6 ka)相关。在九个地点,我们扩展了形态地层学,以推导出上更新世的表观抬升率和经eustasy 校正的抬升率。在古巴沿岸,MIS 5e 沿海阶地和相关的海岸线角度发生在 7 m 到 40 m 的海拔高度,产生了 0.06 ± 0.01 mm.yr 的eustasy 校正的抬升率 古巴群岛有五个主要的抬升海岸线,被下沉区隔开,至少有 23 个出现的海岸阶地阶梯序列。在四个地点,最低的珊瑚礁阶地先前与最后一次间冰期最大值(MIS 5e,122 ± 6 ka)相关。在九个地点,我们扩展了形态地层学,以推导出上更新世的表观抬升率和经eustasy 校正的抬升率。在古巴沿岸,MIS 5e 沿海阶地和相关的海岸线角度发生在 7 m 到 40 m 的海拔高度,产生了 0.06 ± 0.01 mm.yr 的eustasy 校正的抬升率 我们扩展了形态地层学以推导出上更新世表观和eustasy校正的抬升率。在古巴沿岸,MIS 5e 沿海阶地和相关的海岸线角度发生在 7 m 到 40 m 的海拔高度,产生了 0.06 ± 0.01 mm.yr 的eustasy 校正的抬升率 我们扩展了形态地层学以推导出上更新世表观和eustasy校正的抬升率。在古巴沿岸,MIS 5e 沿海阶地和相关的海岸线角度发生在 7 m 到 40 m 的海拔高度,产生了 0.06 ± 0.01 mm.yr 的eustasy 校正的抬升率-1(古巴西北部)至 0.33 ± 0.01 mm.yr -1(古巴东南部)。在转换断层以北 400 多公里处,eustasy 校正的抬升率 (0.13 mm.yr -1 ) 表明整个古巴群岛都受到北美/加勒比板块运动的影响,具有分区的压缩分量导致块体构造受区域断层控制的倾斜。

更新日期:2021-08-17
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