• Sedimentology and diagenesis of Miocene Lirio Limestone ...

    1991-3-1 · @article{osti_7158882, title = {Sedimentology and diagenesis of Miocene Lirio Limestone, Isla de Mona, Puerto Rico}, author = {Ruiz, H and Gonzalez, L A and Budd, A F}, abstractNote = {Isla de Mona is a carbonate plateau, 50 mi west of Puerto Rico. The island lies on the southern portion of the Mona Platform. It is composed mostly of two Miocene carbonate …

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  • Strontium stratigraphy of the upper Miocene …

    2020-1-16 · mixing time. If this method works on oceanic successions, marginal basins may show different Sr isotope records in comparison with the coeval ocean one due to sea-level variations, continental run-off and restricted water exchanges. In this work, we present the 87Sr/86Sr isotope record of the upper Miocene carbonate ramp of the Lithothamnion

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  • Paleoecology of an early Miocene, rapidly submerging …

    2018-6-13 · Paleoecology of an early Miocene, rapidly submerging rocky shore, Motuketekete Island, Hauraki Gulf, New Zealand ... of the Papakura Limestone and its equivalents (Hayward & Brook 1984). Detailed analysis of Kawau Subgroup sediments ...

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  • Long&period orbital control on middle Miocene global ...

    2017-10-4 · locate the position of the major middle Miocene global cooling step and associated events. 2. Geological Setting, Section, and Lithology [6] The sediments of the Globigerina Limestone and Blue Clay Formation on Malta and Gozo were deposited in the Maltese Graben System, a series of Miocene-Quaternary

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  • The Early Miocene "Bisciaro volcaniclastic event ...

    The Early Miocene Bisciaro Fm., a marly limestone succession cropping out widely in the Umbria-Romagna-Marche Apennines, is characterized by a high amount of volcaniclastic content, characterizing this unit as a peculiar event of the Adria Plate margin. Because of this volcaniclastic event, also recognizable in different sectors of the central-western …

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  • EVOLUTION OF NORTHERN GUAM LIMESTONE AQUIFER

    2017-12-16 · limestone section continued through Miocene-Pleistocene. Uplift of island and sea level swings produce major changes in geometry of freshwater lens system. Limestone section underwent pervasive diagenesis, reacting to as many as four different geochemical environments: marine phreatic, mixing, freshwater phreatic, and vadose.

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  • An example of mixing-zone dolomite, middle Eocene Avon ...

    The dolomite cement is not a replacement of limestone but an overgrowth of early-formed marine dolomite and pore-occluding cement. From analyses of samples containing both the early marine dolomite and the late dolomite cement, quantitative estimates of pure cathodoluminescent dolomite cement are: delta 13 C = -0.5 per thousand and delta 18 O ...

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  • Miocene Foraminifera Biostratigraphy and Interpretation ...

    This work is the subject of the biostratigraphic and palaeoenvironmental study of the North Deep Sea area of the Congolese Miocene Atlantic Basin. This study is made from samples of lateral cores, drill cuttings and electrical logs. Lithology generally exhibits an irregular alternation of weakly indurated grey clay, light grey siltstones, and whitish, quartzitic sand, medium to …

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  • Geological Field Trips in Southern Idaho, Eastern Oregon ...

    2004-12-2 · 4.5 11.1 Light-colored exposures are part of the Late Miocene–Pliocene Lake Idaho deposits. 1.2 12.3 Freshwater limestone is exposed overlying the Vines Hill andesite to the northwest. Note the exposures of cross-bedded gravels and sandstones along the highway east of the Vines Hill summit.

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  • :ulate Il ey lltiple hese )und S, Geological and Sea Level ...

    2005-2-10 · Miocene limestone, Arcadia the seafloor (Figs. 2 and 3). This seismic sequences (Figs. 5b and e, Kluences prograde from the south 10forms are mid-Miocene to early- ''r Formation. The four upper units that are not represented in any strine sequence (Edgar et al. 2002) ''11th of the trough in the center of h overlain bv modern estuarine

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  • Strontium stratigraphy of the upper Miocene …

    In this work, we present the 87 Sr/ 86 Sr isotope record of the upper Miocene carbonateramp of the Lithothamnion Limestone(Majella Mountain, central Apennines), as an example of the onset of restrictedwater exchanges between a marginal basin and the ocean water masses. The overalllatemost Tortonian–earlyMessinian Sr isotope record of the ...

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  • Palaeogeography, Palaeoclimatology, Palaeoecology

    2012-6-13 · High-resolution isotopic record of C 4 photosynthesis in a Miocene grassland Jennifer M. Cotton a,⁎, Nathan D. Sheldon a, Caroline A.E. Strömberg b a Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA b Department of Biology & Burke Museum of Natural History and Culture, University of Washington, Seattle, …

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  • Sedimentary facies, depositional environments and ...

    2021-7-8 · limestone and marls rich in molluscs and foraminifera and becomes siliciclastic dominated in the middle. The biotur-bated and channelized sandstones are overlain by stroma-tolitic and oolitic limestones. Red-bed facies marks the suba-erial exposure of the buildup and initiation of sea-level fall. The aims of the paper are: 1.

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  • Facies, diagenesis and secondary porosity of a Miocene ...

    2021-6-21 · Present studies focus the depositional and diagenetic processes controlling porosity of the middle to upper Miocene carbonates in Central Luconia, Malaysia. Secondary porosity has previously been linked to growth history, meteoric diagenesis, and burial diagenesis, with a few studies suggesting the possibility of diagenetic evolution driven by mixing zone or refluxing …

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  • A LABORATORY INVESTIGATION OF THE RELATIVE …

    2008-3-6 · underlain by the Miocene Lirio Limestone. The core of the island is composed of the Isla de Mona Dolomite (Kaye 1959; Frank et al. 1998a). There are many caves on the island, most-ly located on the plateau escarpment near the contact between the limestone and the dolomite (Frank 1993; Frank et al. 1998b).

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  • Use of isotopic tracers to characterize the interaction of ...

    2017-8-26 · the water-bearing system of Miocene aquifer (Gersar-Sect 1977). Underlying this aquifer is the so-called deep aquifer system which is related to the Middle Miocene rocks (Tortonain and Helvetian formations) with widely differing extension and thickness. In these gypso-marl or limestone and dolomite rocks, permeability depends mostly on the

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  • Habitat and Environment of Islands--Primary and ...

    Globigerinid limestone of late Miocene to Pliocene age crops out and lies in the shallow subsurface areas of northwestern Puerto Rico. Oligocene to middle Miocene age rocks tentatively can be divided into five depositional sequences and associated systems tracts; these rocks record carbonate and minor siliciclastic deposition that occurred in ...

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  • (PDF) Sedimentological and diagenetic study of the Early ...

    2014-5-19 · This study demonstrates that, in the Caddo Limestone of the Eliasville and Breckenridge fields, porosity and permeability are best developed in phylloid-algal wackestones and packstones, as well ...

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  • Progressive dolomitization of Florida limestone recorded ...

    2007-1-17 · As early as the mid-1960s, seawater was proposed to flow northward by geothermal convection, at depths of 800–1000 m, through the cavernous and highly permeable "Boulder Zone", consisting of limestone and dolomitic limestone of Eocene age, confined from above by Oligocene and Miocene limestone and sands of low permeability, and from below ...

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  • Dolomitization and evolution of the Puerto Rico North ...

    2021-9-28 · The Lares Limestone and Montebello Member of the Cibao Formation form the lower confined aquifer system of the Puerto Rico North Coast. These extensively cored Neogene limestone units dip from 4° to 6° toward the north, are exposed over a broad area, and have a relatively well-known geologic setting and history Dolomite is absent in the exposed sections …

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  • Mixed siliciclastic-carbonate sedimentation on the …

    2021-5-20 · During the Miocene, when the Zhujiang Formation was deposited, the eastern part of the Pearl River Mouth Basin, northern South China Sea, underwent intense mixed siliciclastic and carbonate sedimentation, particularly on the platform of the marginal ramp of the Dongsha Rise, northeastern margin of the South China Sea.

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  • Facies, diagenesis and secondary porosity of a Miocene ...

    The Subis Limestone is composed of massive and branching corals, coralline red algae, benthic foraminifera, bivalves, gastropods, echinoids, and occasionally bryozoans and sponges.

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  • (PDF) PETROGRAPHICAL AND MICROFACIES STUDY OF …

    The limestone is medium to thick bedded, calcareous or marly and bituminous with interbeds of dolomitic limestone and chert appears on the upper part of the formation.

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  • A-R_-CSDN

    2017-11-9 · Miocene ( ) ;() misalignment miscellaneous fill misclosure misorientation, mitigation measures mitigation strategy mixed-in-place-pile, mixing plant

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  • (PDF) Seafloor Spreading Anomalies in the South China …

    Our interpretation is that symmetric seafloor spreading of 5.6 cm/year full rate began at ~31 Ma at an E-W trending ridge in the central''part of the South China Sea. After a ridge jump of ~50 km ...

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  • A late Miocene-early Pliocene chain of lakes fed by the ...

    2018-1-16 · A late Miocene-early Pliocene chain of lakes fed by the Colorado River: ... replacement of marine Sr with later Colorado River strontium and any mixing between seawater and river water. Comparisons are also made with the Miocene Hualapai ... limestone is dated using 40Ar/39Ar and tephrochronologic correlation to a range of 11-

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  • Latest Eocene and Oligocene tectonic controls on …

    2021-10-15 · The latest Miocene and Early Pliocene equivalent of the Karren Limestone is the Mundu Globigerina limestone, which can be traced to quarried outcrops in the Pegat Anticline 18 km south of the KUJ-1, where a limestone from a middle point of the quarried section has been dated as 5.56 Ma (sample TA26 in supplementary data) The upper part of the ...

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  • GEOCHEMISTRY OF GROUNDWATER IN THE MIXING …

    Miocene reef complex near the coast and the Jurassic limestone in the more mountainous northern part of the island. The samples covered a range in salinities from 1.0 to 35.0

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  • Middle Miocene climate transition in the Tibetan Plateau ...

    2021-10-26 · The Middle Miocene Climatic Optimum is known for abrupt events during the global cooling trend of the past 20 Ma. Its identification in the Tibetan Plateau can help explain the cause of the critical Middle Miocene climate transition in Central Asia. ... decreasing algal limestone layers and decreasing lacustrine organic matter are indicators of ...

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