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digitate mesoclot

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<b>Digitate</b> <b>Mesoclot</b> and Dolomitic Matrix  A1: Thin-section view of section ac...
in > GeoArabia
Published: 01 July 2014
Plate 1A: Digitate Mesoclot and Dolomitic Matrix A1: Thin-section view of section across a digitate mesoclot. Strands and patches of microcrystalline dolomite (1b) similar to the matrix are seen within the neomorphic calcite spar. A2–A3: Same view in cathodoluminescence. Image shows
Journal Article
Published: 01 May 2001
Journal of Sedimentary Research (2001) 71 (3): 410–422.
... framework cavities within it that are completely filled with internal sediment. The largest cavities, 2-3.5 m in diameter, are probably the largest ever recorded in a thrombolite reef. Four main types of components are distinguished in the reef framework: (1) dense bushy mesoclots, (2) dense rounded...
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Journal Article
Journal: PALAIOS
Published: 01 April 2000
PALAIOS (2000) 15 (2): 166–169.
.... Since publication of that paper, there have been several attempts at redefinition that have further complicated our understanding of, and communication about, thrombolites. A distinction must be made between the thrombolite column and the mesostructural clots (mesoclots) that comprise it. Poorly...
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Image
Facies F, <b>digitate</b> radiating or “bushy” thrombolite, block 6 ( Figure 2b )....
in > GeoArabia
Published: 01 July 2014
dominant upward branching (e.g. yellow arrows) of dark digitate mesoclots in pale matrix. (c) Slabbed sample from the top of the bushy feature showing 0.5–1 cm size, circular to elongated cross section of digitate branches (labelled mc) in pale matrix (labelled d). Top of the sample shows caliche crust
Image
Dendrolitic <b>mesoclots</b>. <b>Digital</b> image of outcrop surface that is perpendicul...
Published: 01 May 2001
Figure 6 Dendrolitic mesoclots. Digital image of outcrop surface that is perpendicular to bedding. Dendrolitic mesoclots seen here are rare in the thrombolite reef. Diagonal arrow points to dendrolites illustrated in Figure 12B .
Journal Article
Journal: GeoArabia
Publisher: Gulf Petrolink
Published: 01 July 2014
GeoArabia (2014) 19 (3): 17–79.
...Plate 1A: Digitate Mesoclot and Dolomitic Matrix A1: Thin-section view of section across a digitate mesoclot. Strands and patches of microcrystalline dolomite (1b) similar to the matrix are seen within the neomorphic calcite spar. A2–A3: Same view in cathodoluminescence. Image shows...
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Journal Article
Published: 01 May 2006
Journal of Paleontology (2006) 80 (3): 411–422.
... organization of ridges similar to garden walls (maceriae) in plan view, branching of ridges into daughter ridges and columns, the polymorphic nature of dark, 1–4 mm mesoclots, and the relative consistency of maceria width (approximately 1 cm). As a group, Favosamaceria is found elsewhere in Upper Cambrian...
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Journal Article
Published: 01 September 2005
Geological Magazine (2005) 142 (5): 499–517.
..., the mesoclots of the Nama reefs do not have the complex digitate or dendriform morphologies that characterize younger thrombolites (e.g. Kennard & James, 1986 ; Riding & Zhuravlev, 1995 ), but instead are restricted to simpler ovoid, globular and colliform morphologies (Figs 9 , 10 , 12...
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Journal Article
Journal: Paleobiology
Published: 01 January 2000
Paleobiology (2000) 26 (3): 334–359.
... to simple ovoid, globose, and colliform morphologies and do not include the complex digitate or dendriform fabrics found in younger thrombolites (e.g., Kennard and James 1986 ; Riding and Zhuralev 1995 ). Nama mesoclots formed an open framework that resulted in development of abundant cavities ( Figs. 5B...
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Journal Article
Published: 04 March 2021
Journal of Sedimentary Research (2020) 90 (12): 1804–1828.
... imagery and field observations. Tufa facies and volumes were quantified for seven tufa exposures across the basin using digital outcrop and elevation models from aerial images acquired from a small uncrewed aerial system (sUAS). Tufa thin sections were examined using transmitted-light petrography...
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Thrombolite Development  F: Schematic representation of the seven stages of...
in > GeoArabia
Published: 01 July 2014
, development of a dull to non-luminescent biomineralisation of clotted calcite, together with accumulation of minor amounts and strings of microcrystalline microbial dolomite similar to the matrix. (5) Crumbling or early irregular brittle fracturing both of the digitate mesoclots and the surrounding matrix
Image
Microbial-dominated reef, Dumat Al-Jandal (all except B are Locality 1).  A...
Published: 01 January 2015
(yellow arrow) and mesoclots of dense microbial micrite (green arrow); blue arrow indicates dissolution vug, cutting both mesoclot and micrite. F) Vertically oriented slab of cortex layer formed by columnar-digitate stromatolite.
Journal Article
Published: 01 January 2002
Journal of Sedimentary Research (2002) 72 (1): 201–216.
... in terms of color and texture to mesoclots in the thrombolites ( Fig. 3A, D, E ). Some of the breccias in facies 3 contain digitate mesoclots identical to digitate mesoclots in laterally adjacent thrombolites ( Fig. 3D, F ). I interpret the breccias in facies 3 to have been created by seismic shaking...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP418.5
EISBN: 9781862397163
... dolomite matrix. ( b ) Digitate radiating or ‘bushy’ thrombolite is composed of 0.5–1 cm size mesoclots in pale microporous dolomitic matrix. The branches of the digitate framework have a circular cross-section. Reproduced with slight modification by kind permission from GeoArabia. The four facies...
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Journal Article
Journal: PALAIOS
Published: 01 December 2001
PALAIOS (2001) 16 (6): 593–600.
...-grained couplets, and overlain by digitate stromatolites and other microbial deposits (Fig. 2) . Thrombolites comprise bioherms (up to about 1 m thick), characterized by a clotted fabric made up of patches or mesoclots of dark, dense micrite. Some mesoclots have well-preserved calcimicrobial forms...
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Journal Article
Published: 01 January 2015
Journal of Sedimentary Research (2015) 85 (1): 45–61.
... (yellow arrow) and mesoclots of dense microbial micrite (green arrow); blue arrow indicates dissolution vug, cutting both mesoclot and micrite. F) Vertically oriented slab of cortex layer formed by columnar-digitate stromatolite. ...
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Journal Article
Journal: Geology
Published: 01 May 2003
Geology (2003) 31 (5): 431–434.
... tens of meters and with a lateral extent of up to several kilometers in certain cases, similar to the scale of Namibian reefs. Texturally, the framework in reefs of both the Nama Group and Ara Group is composed of a network of mesoclots. A strong similarity exists between the carbon isotopic...
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Journal Article
Journal: PALAIOS
Published: 28 December 2020
PALAIOS (2020) 35 (12): 524–542.
...- Lichenaria - Renalcis , and the Renalcis -thrombolite boundstone-type of Pratt and James (1982 , 1989). Lithology (2) forms massive layers of up to 1.5 m thick and consists exclusively of arborescent-digitate thrombolites. Lithology (3) forms individual buildups of several meters in diameter, up to <...
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Journal Article
Journal: GeoArabia
Publisher: Gulf Petrolink
Published: 01 April 2003
GeoArabia (2003) 8 (2): 231–270.
... in the central part of the dome. This sequence boundary caps a 2 to 3 m-thick thrombolite framestone shown in Figures 15c , d . Dark components (mesoclots of Kennard and James, 1986 ; Grotzinger, 2001 ) form bush-like structures locally, creating significant primary pore space (initally about 50%), now filled...
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Journal Article
Journal: PALAIOS
Published: 01 January 2014
PALAIOS (2014) 29 (1): 27–37.
...., Aitken 1967 ), were subsequently redefined as maze-like (maceriate) microbialites ( Shapiro and Awramik 2006 ; Lee et al. 2010 ). The maze-like microbialites are distinguished from thrombolites with millimeter- to centimeter-scale clotted texture; the maze-like structures may contain mesoclots within...
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