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GEOLOGY OF CENTRAL DOMINICAN REPUBLIC

1966; Geological Society of America; Linguagem: Inglês

10.1130/mem98-p11

0072-1069

Carl Bowin,

earthquake and tectonic studies

The geology of approximately 5000 sq km in central Dominican Republic has been mapped and described. Metamorphosed, pre-Middle Albian(P), volcanic rocks of the greenschist facies crop out in a belt that trends northwest-southeast across the mapped area. The metamorphosed rocks occur as two distinct rock types: metamorphosed mafic volcanic rocks (Duarte Formation and unnamed rocks northeast of Jarabacoa); and a unit composed predominantly of metamorphosed quartz keratophyre (Maimon Formation). A fault zone containing a large elongate body of serpentinized peridotite separates the two metamorphosed units. At the east end of the Cordillera Central, the trend of the peridotite and of the schistosity in the metamorphic rocks is approximately N. 40° W., but near La Vega in the northwest corner of the area studied the trend changes to N. 70° W. Unconformably overlying the metamorphosed Duarte Formation are vitric basalts of the Siete Cabezas Formation, and unconformably overlying the Maimon Formation are pyroxene andesite and tuff of the Peravillo Formation. The Siete Cabezas and Peravillo Formations are pre-Tertiary and probably also pre-Middle Albian.