Distribution, Petrography, and Geochemical Characterization of Radiaxial Calcite and Associated Diagenetic Events in the Capitan Formation, West Texas and New Mexico

Rahnis, Michael; Kirkland, Brenda L.

doi:10.2110/pec.99.65.0176

Cited by 6 publications

(35 citation statements)

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“…Most recently, fascicular-optic fabrics have been detected in cryocalcites, i.e., crystals forming from freezing pool waters (near 0°C) on ice bodies in caves (Richter and Niggemann, 2005;Lacelle et al, 2009; Table 2). Marine radiaxial calcites are mainly characteristic for tropical (Saller, 1986;Aissaoui, 1988;Mazzullo et al, 1990;Rahnis and Kirkland, 1999;Immenhauser et al, 2001) and sub-tropical environments (Davies and Nassichuk, 1990;Van der Kooij et al, 2010) with water temperatures, that in analogy with modern tropical settings, range between at least 20 and 35°C and perhaps cooler pore water in the order of 15 or 20°C. Reinhold and Kaufmann (2010) report radiaxial fabrics precipitated from cooler waters during platform drowning (18-21°C; Table 2).…”

Section: Tablementioning

confidence: 99%

Radiaxial-fibrous calcites: A new look at an old problem

Richter

Neuser

Schreuer

et al. 2011

Sedimentary Geology

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Section: Tablementioning

confidence: 99%

Radiaxial-fibrous calcites: A new look at an old problem

Richter

Neuser

Schreuer

et al. 2011

Sedimentary Geology

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“…A mixing zone origin has also been suggested because IRP precipitated after fibrous marine cements but before blocky calcite (CS1) that is inferred to be meteoric and because IRP is absent from growth framework pores in the reef-observations consistent with a mixed water origin (Mruk, 1989;Mutti and Simo, 1993;Mazzullo, 1999;Rahnis and Kirkland, 1999). Dolomite necklaces at IRP terminations and intergrown kaolinite books were not observed in this study.…”

Section: Inclusion-rich Prismatic Calcitementioning

confidence: 53%

“…An original mineralogy as HMC is probable, given the abundance of dolomite microinclusions (Meyers and Lohmann, 1977). A marine origin is suggested by the fibrous texture and elevated Sr (Rahnis and Kirkland, 1999). In addition, neptunian fissures related to cycle bounding surfaces commonly fractured strata containing voluminous early RFC and FOC pore-lining cement, suggesting that the cements formed during the sea level cycle that deposited the sediments.…”

Section: Radiaxial Fibrous Calcite and Fascicular Optic Calcitementioning

confidence: 96%

“…A primary origin may be suggested by curved twin planes and unaligned optic axes, which are energetically unfavorable and unlikely to result from replacement (Kendall, 1985). In contrast, Rahnis and Kirkland (1999) concluded that RFC and FOC are products of recrystallization because of an uneven distribution of dolomite microinclusions (cf. Wilson and Dickson, 1996;Richter et al, 2011).…”

Section: Radiaxial Fibrous Calcite and Fascicular Optic Calcitementioning

confidence: 99%

“…Other scientists have interpreted that IRP precipitated from meteoric-marine waters in a mixing zone, based on the presence at IRP terminations of microinclusions of dolomite (dolomite necklaces) and/or kaolinite, inferred to have formed under meteoric influence (e.g., Mazzullo, 1999;Rahnis and Kirkland, 1999). A mixing zone origin has also been suggested because IRP precipitated after fibrous marine cements but before blocky calcite (CS1) that is inferred to be meteoric and because IRP is absent from growth framework pores in the reef-observations consistent with a mixed water origin (Mruk, 1989;Mutti and Simo, 1993;Mazzullo, 1999;Rahnis and Kirkland, 1999).…”

Section: Inclusion-rich Prismatic Calcitementioning

confidence: 99%

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Meteoric diagenesis and fluid-rock interaction in the Middle Permian Capitan backreef: Yates Formation, Slaughter Canyon, New Mexico

Bishop¹,

Osleger²,

Montañez³

et al. 2014

Bulletin

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This study examines the geochemical record of diagenesis in the Middle Permian Yates shelf, exposed in Slaughter Canyon, New Mexico. This diagenetic history significantly modified lithologies, depositional fabrics, and pore systems. Early diagenesis was dominated during sea level highstands by marine cementation and reflux dolomitization, and during sea level lowstands by meteoric cementation and stabilization-the focus of this study. This early diagenesis variably overprinted primary marine isotopic signatures, potentially leading to erroneous chemostratigraphic correlations or paleoclimate reconstructions.Four correlative sections through one m-scale cycle were analyzed for their δ 13 C and δ 18 O values. They show significant (2-4‰) δ 13 C and δ 18 O variability in coeval, texturally wellpreserved calcites. The δ 13 C and δ 18 O values of marine cements, brachiopods, bulk carbonate, micritic matrix, and the first generation of meteoric spar (from high to low values) delineate an "inverted J curve," indicating the variable alteration of components by diagenetic fluids. Numerical models indicate that the observed stable isotope trend is most consistent with diagenetic alteration in a partially closed system by meteoric fluids mixed with a progressively diminishing contribution of recycled marine waters.In the Yates shelf, marine cements provide a more robust primary isotopic record than micritic matrix; however, neither preserves primary seawater isotopic values. Furthermore, common criteria used to diagenetically screen samples proved inadequate (e.g.

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Deep marine diagenesis, offshore Hawaii and Enewetak, with implications for older carbonates

Saller¹,

Winterbottom²

2022

The Depositional Record

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Cenozoic limestones from Hawaii and Enewetak were studied to characterise diagenesis in deep sea water. Hawaii samples were from subsea outcrops of drowned Pleistocene reefs 150-1,505 m deep (maximum age 550-600 ka). Most samples had early fibrous aragonite and high-magnesium calcite cements precipitated in shallow sea water. Partial dissolution of aragonite (including coral) and highmagnesium calcite were significant at 412 m and increased to 1,505 m. Crusts of 'stubby' sparry calcite cement (2-8 mol.% MgCO 3 ; 'lower Mg calcite') precipitated on early aragonite and high-magnesium calcite cements at 473-1,358 m. Dissolution of aragonite and high-magnesium calcite was incomplete. Aragonite and high-magnesium calcite were not neomorphosed to low-magnesium calcite ( <5 mol.% MgCO 3 ). Enewetak well samples came from 3 to 1,400 m (Holocene to Upper Eocene). Lower Miocene to Upper Eocene carbonates at 380-1,380 m near the atoll margin showed pervasive dissolution of aragonite and conversion of high-magnesium calcite fossils to low-magnesium calcite. Their lower-Mg calcite cements (380-820 m; mainly radiaxial) were associated with aragonite dissolution. The lower-Mg calcite cements and bulk limestones below 500 m had geochemistry indicating precipitation or stabilisation in sea water at 10-27°C. Data indicate Enewetak dolomitisation (1,250-1,320 m) in cold sea water during burial >1,000 m. Coralline algae showed little petrographic alteration, but Mg decreased downward from 15 to 1.5 mol.% MgCO 3 . In both areas, aragonite dissolution, alteration of high-magnesium calcite, and precipitation of lower-Mg calcite cements occurred in deep sea water (>300 m) undersaturated for aragonite, but supersaturated for low-magnesium calcite. Original high-magnesium calcite was partially dissolved in Hawaii samples, but converted to low-magnesium calcite in deep Enewetak cores, possibly due to gradual deepening at Enewetak. Dolomitisation and low-magnesium calcite dissolution occurred below the calcite saturation depth (approximately 1,000 m) in Enewetak, but not deep Hawaii samples, possibly because dolomitisation is slower. Temporal variations in carbonate saturation, especially related to pCO 2 , are interpreted as the main control on mineralogy during marine diagenesis now and in many ancient oceans.

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Distribution, Petrography, and Geochemical Characterization of Radiaxial Calcite and Associated Diagenetic Events in the Capitan Formation, West Texas and New Mexico

Cited by 6 publications

References 0 publications

Radiaxial-fibrous calcites: A new look at an old problem

Radiaxial-fibrous calcites: A new look at an old problem

Meteoric diagenesis and fluid-rock interaction in the Middle Permian Capitan backreef: Yates Formation, Slaughter Canyon, New Mexico

Deep marine diagenesis, offshore Hawaii and Enewetak, with implications for older carbonates

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