Comparative Fabrics of Length-Slow and Length-Fast Calcite and Calcitized Aragonite in a Holocene Speleothem, Carlsbad Caverns, New Mexico

Folk, Robert L.; Assereto, R.

doi:10.1306/212f6fcd-2b24-11d7-8648000102c1865d

Cited by 21 publications

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“…These length-slow calcite crystals (Dickson, 1978) are relatively free of intracrystalline inclusions. Equant basal calcites have also been reported by Gradzinski et al (1996), and elongate length-slow "tooth-shaped" calcites were reported by Folk and Assereto (1976). In one instance, over a 2 mm section of the NG flowstone (interval at 525-526 mm), a transitional zone, less than 70 um wide, is composed of white (in hand specimen), very friable acicular calcite containing abundant impurities (Figure 2.4d).…”

Section: Mineralogy and Petrology Of The Ocnm Cave Calcitesmentioning

confidence: 62%

“…Over 90% of the spelean calcites in our samples are composed of elongate columnar crystals, 0.2 to 1.0 mm wide and generally 2 to 20 mm long. These are similar to the "palisade" crystals of Folk and Assereto (1976). The c-axes are oriented parallel to the crystals' length and roughly perpendicular to the growth surface (length-fast calcite; Dickson, 1978).…”

Section: Mineralogy and Petrology Of The Ocnm Cave Calcitesmentioning

confidence: 65%

“…While many studies of spelean deposits have focused on growth mechanisms (Kendall and Broughton, 1978), petrology (Folk and Assereto, 1976;Frisia et ah, 1993;Frisia, 1996a;Genty and Quinif, 1996), and geochemistry (Lohmann, 1988;Gonzalez et al, 12 1992), few papers (Gradzinsky et al, 1996;Hercman et al, 1996) have dealt with discontinuities and allogenic contaminants within calcareous cave deposits. In this paper, we present results of a detailed petrologic study (fabrics and discontinuities) of two flowstones (22 and 73 cm thick) and a 5 cm stalagmite from Oregon Caves National Monument (OCNM), a dissolutional cave system located in southwestern Oregon.…”

Section: Introductionmentioning

confidence: 99%

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Petrography and discontinuities, growth rates and stable isotopes of speleothems as indicators of paleoclimates from oregon Caves National Monument, southwestern Oregon, USA.

Turgeon¹

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The author has granted a nonexclusive licence allowing the National Library of Canada to reproduce, loan, distribute or sell copies of this thesis in microform, paper or electronic formats.The author retains ownership of the copyright in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.L'auteur a accorde une licence non exclusive permettant a la Bibliotheque nationale du Canada de reproduire, preter, distribuer ou vendre des copies de cette these sous la forme de microfiche/film, de reproduction sur papier ou sur format electronique.L'auteur conserve la propriete du droit d'auteur qui protege cette these. Ni la these ni des extraits substantias de celle-ci ne doivent etre imprimes ou autrement reproduits sans son autorisation.

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Section: Mineralogy and Petrology Of The Ocnm Cave Calcitesmentioning

confidence: 62%

Section: Mineralogy and Petrology Of The Ocnm Cave Calcitesmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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Petrography and discontinuities, growth rates and stable isotopes of speleothems as indicators of paleoclimates from oregon Caves National Monument, southwestern Oregon, USA.

Turgeon¹

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“…These form botryoids, which show individual crystals reaching up to 0.5 mm in length with flat terminations (Figure 4B) and show sweeping extinction, but most are calcitised to microspar aggregates. The acicular crystals and flat terminations of these early cements are inferred to have been originally aragonitic precipitates (Folk & Assereto, 1976). Some archaeocyath pores also show fascicular fibrous cements with sweeping extinction, inferred to have been high‐Mg calcite (Figure 4C).…”

Section: Resultsmentioning

confidence: 99%

“…In some voids of archaeocyaths, acicular crystals form a thin layer, where crystals are about 20 μm long with triangular cross-section, blunt terminations and with no luminescence (Figure 5F). These are interpreted as originally aragonitic cements (Folk & Assereto, 1976).…”

Section: Mineralogy Of Early Marine Cementsmentioning

confidence: 99%

The record of sea water chemistry evolution during the Ediacaran–Cambrian from early marine cements

Xiong

Wood

Pichevin

2022

The Depositional Record

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The Ediacaran-Cambrian Radiation marks the widespread appearance of metazoans and calcareous biomineralised hard parts. These innovations occurred during an interval of dynamic changes in marine redox and sea water chemistry. Here, changing carbonate mineralogy, Mg/Ca ratios and rare earth element concentrations including the relative abundance of cerium (Ce anomaly: Ce anom ) are documented to track sea water oxygen levels, in well-preserved early marine cements from shallow marine reefs from Cambrian Stages 2-4 (ca 525-512 Ma). First, integrating the mineralogical data with published records, several shifts in dominant carbonate mineralogy are inferred: 'dolomite-aragonite seas' in the late Ediacaran; 'aragonite/high-Mg calcite seas' in Cambrian Stage 2; a temporary shift to a 'calcite sea' during early Cambrian Stage 3; an 'aragonite sea' between late Cambrian Stage 3 and late Cambrian Stage 4, then a gradual shift from mixed 'aragonite-calcite seas' during the middle and upper Cambrian towards a 'calcite sea' by the early Ordovician. Second, based on measured mMg/ Ca in early marine cements, calculated sea water mMg/Ca at 15 and 35°C ranges from 1.2 to 0.8 in Cambrian Stage 2, 0.7-0.4 in Stage 3 and 1.4-0.9 in Stage 4 respectively. Finally, analysed Ce anom data combined with existing Ce anom data suggest potentially three phases of global oxic expansion. First, a long-lived phase of progressive oxygenation during the late Ediacaran to Fortunian (ca 550-540 Ma; average Ce anom from 0.99 to 0.41), and possibly two shorter phases during early Cambrian Stage 3 (ca 519 Ma; average Ce anom from 0.91 to 0.40) and Stage 4 (ca 512 Ma; average Ce anom from 1.02 to 0.49), bounded by intervals of more dominant anoxia. Summarising, these data demonstrate that early marine cements offer an underused and high-resolution archive of shallow marine redox and sea water chemistry through this critical transition in Earth's evolution.

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Fluid inclusions in vadose cement with consistent vapor to liquid ratios, Pleistocene Miami Limestone, southeastern Florida

Barker

Halley

1988

Geochimica et Cosmochimica Acta

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Comparative Fabrics of Length-Slow and Length-Fast Calcite and Calcitized Aragonite in a Holocene Speleothem, Carlsbad Caverns, New Mexico

Cited by 21 publications

References 0 publications

Petrography and discontinuities, growth rates and stable isotopes of speleothems as indicators of paleoclimates from oregon Caves National Monument, southwestern Oregon, USA.

Petrography and discontinuities, growth rates and stable isotopes of speleothems as indicators of paleoclimates from oregon Caves National Monument, southwestern Oregon, USA.

The record of sea water chemistry evolution during the Ediacaran–Cambrian from early marine cements

Fluid inclusions in vadose cement with consistent vapor to liquid ratios, Pleistocene Miami Limestone, southeastern Florida

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