Late Oligocene-Pliocene Transgressive-Regressive Cycles of Sedimentation in Northwestern Puerto Rico

Seiglie, George A.; Moussa, Mounir T.

doi:10.1306/m36440c7

Cited by 15 publications

(8 citation statements)

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“…Ward et al (2002) placed the boundary in the uppermost Chattian, close to the Oligocene-Miocene boundary, which is predicted to be located at a depth rage of 1920-2040 m according to our polynomial fit (Figure 5). Seiglie and Moussa (1984) and Hubbard (1923) suggested however, a Middle Oligocene age for this boundary, 27.4 and 28.1 Ma, respectively, for the San Sebastian-Lares boundary. These ages fall within the predicted ages for a depth of 2315 m in Figure 5.…”

Section: Discussionmentioning

confidence: 91%

“…Monroe (1980) estimates the total thickness of the Quebradillas Limestone units on land to be about 100 m (Ward et al, 2002). Previous authors (Ward et al, 2002;Seiglie and Moussa, 1984;Monroe, 1980;Meyerhoff, 1975) estimated the unconformity between the Aymamón and Quebradillas Limestones on land to span several million years. If 1674 m is the bottom of Quebradillas Limestone, it leaves the dive interval between 1762 (the prominent unconformity on top of Aymamón Limestone) and 1674 m as a section with no known equivalence in outcrops or in boreholes on land.…”

Section: Discussionmentioning

confidence: 99%

“…Detailed descriptions of the sedimentary section exposed on land in northern Puerto Rico were provided by Hubbard (1923), Zapp et al (1948, Meyerhoff (1975), Monroe (1980), Moussa (1984), andWard et al (2002), based on outcrops and logs of two deep boreholes and additional shallow boreholes. 4CPR borehole, located 8 km east of Arecibo (Figure 1B), was drilled in 1960 to a depth of 1961 m, and spanned the entire post upper Eocene sedimentary sequence (Briggs, 1961).…”

Section: Geological Background Of Puerto Rico and Mona Riftmentioning

confidence: 99%

“…v. 03/08/2024 7 parallel to each other up to the seafloor (Moussa et al, 1987, López-Venegas et al, 2008Mondziel et al, 2010) and do not show a fan pattern, as expected to form over a slowly tilting substrate. Seiglie and Moussa (1984)…”

Section: Geological Background Of Puerto Rico and Mona Riftmentioning

confidence: 99%

“…We plotted a 120 m thick Quebradillas Limestone in 4CPR borehole (Figure 6). We assumed that the age of the Lares Limestone -San Sebastian formation boundary in both Toa Baja and 4CPR boreholes is 27.4 Ma (Seiglie and Moussa, 1984), similar to Figure 5.…”

Section: Comparison To 4cpr Borehole and Lateral Variation In The Car...mentioning

confidence: 99%

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Field geology under the sea with a remotely operated vehicle: Mona Rift, Puerto Rico

ten Brink,

Chaytor,

Bialik

et al. 2024

Preprint

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We implemented concepts of field geology at great ocean depths by constructing virtual outcrops from a string of overlapping video frames collected by remotely operated vehicles (ROV). This lower cost alternative to drilling boreholes allows stratigraphic extension into the offshore and for regional interpretation of marine seismic profiles. The imagery was collected along a dive transect on the west wall of Mona Rift, a deep and narrow rift NW of Puerto Rico between water depths of 1560 and 3927 m. The northern coast of Puerto Rico and its large offshore area are underlain by a mid-Eocene and younger forearc basin topped by a thick carbonate platform. There are no drillholes offshore and tying seismic lines across the shoreline there is problematic. We describe our virtual outcrop and constrain its age and stratigraphy using 7 ROV rock samples and compare them to deep boreholes and outcrops on land. Our formation descriptions and ages agree for the most part with those on land, but we identified a 100 m thick section, represented on land by an unconformity. Our stratigraphic interpretation indicates lateral variations in formation thicknesses and establishes a cross-section for additional sampling of the Eocene-Pliocene geology. It also suggests that Mona Rift has formed since mid-Pliocene. The presence or absence of Fe-Mn crust on rocks along the transect may be correlated with the smoothness of the rock surface.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Geological Background Of Puerto Rico and Mona Riftmentioning

confidence: 99%

Section: Geological Background Of Puerto Rico and Mona Riftmentioning

confidence: 99%

Section: Comparison To 4cpr Borehole and Lateral Variation In The Car...mentioning

confidence: 99%

See 3 more Smart Citations

Field geology under the sea with a remotely operated vehicle: Mona Rift, Puerto Rico

ten Brink,

Chaytor,

Bialik

et al. 2024

Preprint

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Mid-Eocene-Early Oligocene Sinistral Transcurrent Faulting in Puerto Rico Associated with Formation of the Northern Caribbean Plate Boundary Zone

Erikson¹,

Pindell²,

Larue³

1990

The Journal of Geology

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Geologic evidence for the prolongation of active normal faults of the Mona rift into northwestern Puerto Rico

Hippolyte¹,

Mann²,

Grindlay³

2005

Active Tectonics and Seismic Hazards of Puerto Rico, the Virgin Islands, and Offshore Areas

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Topography, bathymetry, regional structural observations, and fault slip measurements support the idea that the Mona rift is an active, offshore extensional structure separating a colliding area (eastern Hispaniola) from a subducting area (northwestern Puerto Rico). Near the city of Aguadilla in northwestern Puerto Rico, paleostress reconstruction through fault slip analysis demonstrates that the Mona rift is opening in an E-W direction. Fault slip analysis also indicates that this opening is oblique in the southern part of the rift. We propose that oblique rifting results from accommodation of E-W extension by oblique right-lateral reactivation of previously mapped, northwest-trending Eocene basement convergent structures (Aguadilla faults, Cerro-Goden fault). The evolution of the stress field during the Miocene and the present E-W opening of the Mona rift support the assumption that the Miocene 25° counterclockwise rotation of Puerto Rico has stopped and that this island is presently moving to the east relative to the colliding Hispaniola.

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Late Oligocene-Pliocene Transgressive-Regressive Cycles of Sedimentation in Northwestern Puerto Rico

Cited by 15 publications

References 0 publications

Field geology under the sea with a remotely operated vehicle: Mona Rift, Puerto Rico

Field geology under the sea with a remotely operated vehicle: Mona Rift, Puerto Rico

Mid-Eocene-Early Oligocene Sinistral Transcurrent Faulting in Puerto Rico Associated with Formation of the Northern Caribbean Plate Boundary Zone

Geologic evidence for the prolongation of active normal faults of the Mona rift into northwestern Puerto Rico

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