The San Marcos mélange, Cordillera Septentrional of the Dominican Republic. Nature, origin and age
DOI:
https://doi.org/10.21701/bolgeomin.128.3.006Keywords:
block-in-matrix formation, calcareous nannofossils, Caribbean plate, mélange, submarine landslidesAbstract
Understanding the nature, origin, and age of a mélange is crucial to deciphering the evolution of certain orogenic belts. Located in the Cordillera Septentrional of the Dominican Republic, the San Marcos Mélange is characterized by a blocks-in-matrix internal structure. Apparently arranged chaotically, the blocks have centimeter to kilometer sizes, include exotic ophiolitic, volcaniclastic, and intrabasinal sedimentary lithologies, and are of Cretaceous to Miocene in age, all immersed in a scaly and variably sheared argillaceous matrix. In less-deformed coherent sections, the Mélange consists of alternating sandstones, siltstones, and clays, indicative of a distal turbiditic depositional environment. Syn-sedimentary deformation is pervasive and produces systems of conjugated extensional shear fractures, veins filled with calcite, cataclastic bands, and boudinage and pinch-and-swell, symmetrical and asymmetrical structures. They are consistent with a layer parallel extension, produced in a low-energy slope setting, and indicate a low-ductility contrast between few or no lithified lithologies. Paleostress analysis of fractures and veins establishes a NE-SW trend of sub-horizontal extension, suggesting an orientation of the basin along a WNW-ESE to NW-SE axis (current coordinates). The biochronological data of nannofossils present in the matrix gives a sedimentary age for the Mélange from, at least, the top of the lower Miocene to the base of the upper Miocene.
The San Marcos Mélange has therefore an essentially gravitational origin. Its deformation was temporally syn-sedimentary and was produced by processes of gravitational sliding, probably triggered by both instability processes within the basin and tectonic (earthquake shaking) mechanisms. Blocks and megablocks of ophiolitic rocks derived from the underlying Puerto Plata complex and of well-lithified, volcaniclastic and sedimentary rocks of the Imbert Fm, represent "exotic" blocks caused by the gravitational collapse of the high topographically margins of the depositional basin, slide down, and emplaced into the unconsolidated slope and basin turbiditic deposits, at least in the lower and middle Miocene. The existence of a large-scale, syn-sedimentary shearing surface directed to-the-ONO at the basal contact suggests that the whole Mélange was displaced once or several times in that direction, contributing to the chaotic nature of the unit. The San Marcos Mélange is not a subduction-zone mélange, but was caused by the submarine landslide of turbiditic sediments in a syn-collisional, piggy-back basin, transported on top of a supra-subduction zone ophiolite of the Caribbean plate.
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