The southeastern tip of Cuba Island is limited to the south by the N‐Caribbean boundary. By revisiting the impressive sequences of coastal terraces of this region, we decipher the Quaternary deformation pattern of this plate boundary. We present a detailed mapping of coastal terraces uplifted over a hundred kilometers of coastline, and U/Th dating. At Punta de Maisí, the deformation pattern shows (a) a faster uplift close to the transform boundary and (b) a northward propagation of folding produced by the convergence of the Bahamas platform toward the Caribbean plate. Along the southern coast of Punta de Maisí, the sequence displays 29 coastal terraces up to 520 m in elevation and a upper Pleistocene uplift rate of 0.23 ± 0.07 mm yr−1. We interpret this deformation as resulting from an offshore north‐dipping reverse fault near the coast. This uplift rate corresponds to 3% to 1.6% of the short‐term horizontal slip rate of Septentrional Oriente Fault Zone (10 ± 0.1 mm yr−1). Along the northern coast of Punta de Maisí, the sequence displays height coastal terraces up to 220 m in elevation and the uplift rates amount to 0.1 ± 0.05 mm yr−1 and likely result from the reverse faulting and folding associated with the offshore North Hispaniola Fault Zone. Uplift rates quickly decrease to the West, in agreement with the westward decrease in the activity of the North Hispaniola Fault Zone due to the docking of the Bahamas Platform against Cuba, while the platform more gently underthrusts Cuba to the East.
Los metales pesados se encuentran entre los contaminantes ambientales más tóxicos de los últimos tiempos. La presente investigación tuvo como objetivo evaluar las aguas del Río Yamanigüey según normas nacionales e internacionales para su uso como agua potable, por ser este unos de los ríos principales de la región de Moa. Se recolectaron 12 muestras a lo largo de toda la cuenca para evaluar los contenidos de aluminio (Al), cromo (Cr), cromo hexavalente (Cr+6), manganeso (Mn), hierro (Fe), cobalto (Co), níquel (Ni), cobre (Cu), cinc (Zn) y plomo (Pb) mediante el método de espectrofotometría de absorción atómica. Los resultados fueron contrastados con las normas correspondientes de la “Guías para la calidad del agua de consumo humano”, con la Norma Cubana (NC 1021, 2014) “Higiene comunal - fuentes de abastecimiento de agua - calidad y protección sanitaria y la Norma Cubana (NC 827, 2017) “Agua potable - requisitos sanitarios”. Como principales resultados se obtuvo que el cromo, el manganeso, el cobre y el zinc, en el 100 % de las muestras estudiadas del Río Yamanigüey, según las normas evaluadas se localizan por debajo de los límites máximos admisibles (LMA).
<p><strong>Abstract</strong></p><p>Coastal boulders or mega-clasts, named <em>huracanolitos</em> in Cuba, are found along many rocky shores. They result from storms/hurricanes or tsunamis, but despite being potentially important indicators for hazard assessment, their mode of emplacement is typically unknown. We studied a coastal boulder that is probably the largest one ever described on Cuba Island. Located on a low-lying coral reef terrace on the SE Cuban shore, the reefal limestone boulder is emplaced seaward of the ruins of the Bucanero resort. The latter was built in 1989, suffered from Hurricanes Ivan (2004) and Dennis (2005), and, in October 2012, was totally destroyed by Hurricane Sandy. Despite these extreme climatic events, satellite images obtained since 1962 show no movement of the block. In order to analyse the boulder and its morphological context, we have analysed its position, shape and its morphological environment. To determine its volume, we developed a low-cost, open-source Structure from Motion photogrammetry (SfM) procedure using a simple 3D spherical target (diameter 30 &#177; 0.2 x 10<sup>-3</sup> m). Using various hydrodynamic equations, we calculated the breaking wave height and associated energy responsible for the dislocation of the coral reef terrace and transport of the boulder. To determine the exposure time of the block on the terrace, we performed <sup>36</sup>Cl analysis and U/Th dating on post-depositional secondary calcite. From these data, the climatic or tsunamigenic (by earthquake or gravity event) origin is discussed. Notably, mapping and dating of a neighboring coastal landslide were made in order to correlate or not its effect on the setting up of the boulder.</p><p><strong>Keywords:</strong> coastal boulder; extreme-wave deposit; tsunami; hurricane; Cuba</p>
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