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NARROW
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all geography including DSDP/ODP Sites and Legs
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Caribbean region
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Cuaba Amphibolite
Geology, structure, and tectonic development of the Rio San Juan Complex, northern Dominican Republic
The Rio San Juan complex includes the largest exposed area of Cretaceous basement rocks exposed in the North Coast Zone of Hispaniola. The northern area of the complex consists of: (1) the Imbert Formation, a Paleocene to lower Eocene series of interbedded sandstone, conglomerate, white tuff, and sedimentary serpentinite; (2) Hicotea schists, pervasively fractured, mafic greenschists with patchily developed glaucophane and lawsonite; (3) Puerca Gorda schists, dominantly mafic, foliated greenschists, also with patchily developed glaucophane and lawsonite; (4) El Guineal schists, fine-grained, dominantly felsic schists; (5) Jagua Clara melange, retrograde eclogite, and garnet blueschist blocks in a highly metasomatically altered and hydrated ultramafic matrix; (6) Arroyo Sabana melange, fine-grained blueschist, marble, altered volcanic and mica-plagioclase blocks in a serpentinite matrix; and (7) Gaspar Hernandez serpentinites. The southern area of the complex is structurally simpler and consists of: (8) Cuaba amphibolites, mafic to felsic gneisses intruded by (9) the Rio Boba Intrusive Suite, gabbros, diorites, and ultramafic cumulates. We suggest that the Hicotea, Puerca Gorda, and El Guineal schists were metamorphosed in a Late Cretaceous subduction zone where they were protruded at depth Fust by the Jagua Clara melange and later by the Arroyo Sabana melange. Serpentinite protrusion also occurred during the Paleocene-Lower Eocene, and when some of these protrusions breached the surface, they were the source of clasts for conglomerate beds in the Imbert Formation. The southern part of the complex was formed either in the Hispaniola magmatic arc or by intrusion of fore-arc gabbroic magmas (the Rio Boba Suite) into fore-arc basement represented by the Cuaba amphibolites. The southern area was juxtaposed against the northern area before the Paleocene, but the mechanism by which this was achieved is unclear. Exposure of the assembled complex had occurred by the Eocene, but the complex was probably covered by clastic sediments during Late Eocene to Miocene times. Both the Cretaceous subduction complex and the mid-Tertiary clastic cover were disrupted and deformed by Neogene, east-west-trending, sinistral, transcurrent movements. Major fault displacements of tens to hundreds of kilometers separated the Puerto Plata area from the Rio San Juan complex, and both areas from southeastern Cuba. Minor displacements occurred within the Rio San Juan complex on sinistral oblique and strike-slip faults. Serpentinite protrusions were probably also reactivated at this time. Transcurrent faulting continues to the present and has resulted in eastward tilting of the Rio San Juan complex and the establishment of its present drainage systems.
Zoned Cr-spinel and ferritchromite alteration in forearc mantle serpentinites of the Rio San Juan Complex, Dominican Republic
Ternary diagram of atomic Cr 3+ –Fe 3+ –Al 3+ compositions. As in Fig. ...
Minor-element contents vs. Mg # in Cr-spinel. Symbols are as in Fig. 3 , ...
Contrasting origins of serpentinites in a subduction complex, northern Dominican Republic
Modal-space Theory: a Study of the Mineralogical Expression of Tholeiitic Compositions At T > 850 °c in the Lithosphere and Mantle
Ultrahigh-pressure to high-pressure eclogite in Cuban ophiolitic mélange reveals proto-Caribbean spreading ridge subduction
Abstract Caribbean Plate margins are assemblages of terranes located, since the Mid-Cretaceous, along transform boundaries between the Caribbean, North and South America and the Pacific and Atlantic oceans. Litho-stratigraphic, petrological and metamorphic features of the main units and their regional correlations allow definition of the main geotectonic elements (continental margins, oceanic basins, subduction zones, magmatic arcs) involved in the evolution of Caribbean Plate margins. They provide valuable constraints on plate evolution since the Jurassic. This involved proto-Caribbean ocean opening, thickening into an oceanic plateau, beginning of convergence in the Early Cretaceous, atypical evolution of a supra-subduction system during the Mid-Cretaceous, subduction of rifted continental margins, Late Cretaceous convergence related to eastward migration of two opposite triple-junctions and strike–slip tectonics. Using these data, we compare different models and suggest improvements.
Abstract Compiled and synthesized geological data suggest that the Caribbean Plate consists of dispersed continental basement blocks, wedges of ?Triassic–Jurassic clastic rocks, Jurassic–Late Cretaceous carbonate rocks, volcanic arc rocks, widespread, probably subaerial basalts and serpentinized upper mantle. This points to an in situ origin of the Caribbean Plate as part of Middle America, continuing the geology of the eastern North America margin in a more extensional tectonic setting. Extension increases from the Gulf of Mexico through the Yucatán Basin to the Caribbean.