Pérez-Valentín, Kevián A.

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    Depositional and diagenetic history of Mona and Monito islands, Puerto Rico and La Romana province, Dominican Republic: A regional study
    (2016) Pérez-Valentín, Kevián A.; Ramírez-Martínez, Wilson R.; College of Arts and Sciences - Sciences; Santos, Hernán; Joyce, James; Department of Geology; Corredor, Jorge E.
    Two main study sites were covered in this research: (1) Monito Island in the Mona Reef Complex, Puerto Rico and, (2) the intersection at Cḩavón River with Highway El Coral at La Romana Province, Southeast Dominican Republic. Diagenesis, including dolomitization, was studied using petrography and geochemistry. In Monito Island, limpid dolomites occurs lining vugs and molds and has been proposed to be a typical product of mixing-zone dolomitization. The rocks showed a variety of post depositional alteration processes such as selective dissolution of allochems followed by diverse successions of marine and meteoric cements. This indicates changes in the diagenetic environment, probably associated with relative sea level changes. Fourteen major facies, five depositional sequences, and five major sequence boundaries (SB) were recognized close to the intersection of Cḩavón River with Highway El Coral at La Romana Province, Southeast Dominican Republic. The stratigraphy studied in this area represents a vertical transition from a carbonate ramp to a carbonate rimmed platform. The depositional sequences consist of several Highstand System Tracts (HST). The Haitises Formation at La Romana Province gave a mean age of formation of 6.20 ± 0.45 million years (Messinian) while mean ages of dolomitization, if deposited in marine waters, ranges from 5.20 ± 0.60 Ma to 6.00 ± 0.35 Ma (Late Miocene to Pliocene).