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Journal Article

Calcimicrobe tubules in uppermost Jurassic Arab-A carbonates of Saudi Arabia Open Access

G. Wyn ap Gwilym Hughes
Journal: GeoArabia
Publisher: Gulf Petrolink
Published: 01 January 2010
GeoArabia (2010) 15 (1): 17–26.
DOI: https://doi.org/10.2113/geoarabia150117
..., chambered microtubules ( Figures 4b to 4g ). Maximum tubule length observed in the thin section is 300 µm, with a consistent width of 40 µm. There is no evidence to suggest that the diameters of the microtubules enlarge in any direction, but they do exhibit “Y-shaped” bifurcation ( Figure 4g...
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Journal Article

Devonian Boring Algae or Fungi Associated with Micrite Tubules Free

David R. Kobluk, Michael J. Risk
Published: 01 November 1974
Canadian Journal of Earth Sciences (1974) 11 (11): 1606–1610.
DOI: https://doi.org/10.1139/e74-159
... some skeletal micritization in Devonian reef complexes in western Canada. In situ endolithic filaments, of 3 μm and 5 μm diameter, occur associated with a micrite rim and micrite tubules in the corallite of an Upper Devonian tetracoral from the Miette reef complex. The filaments are found...
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Nanoscale tubules in a uranyl selenate. From Krivovichev et al.(2005a).

Nanoscale tubules in a uranyl selenate. From Krivovichev et al. (2005a) .... Available to Purchase

Published: 01 December 2005
F ig . 17. Nanoscale tubules in a uranyl selenate. From Krivovichev et al. (2005a) .
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TEM images of different types of association of chrysotile tubules in asbestiform serpentinite veins. (a) Entangled fibrils. Piedmont zone, Western Alps, Italy. (b) Parallel, close-packed fibrils with equal outer diameters. Note some isolated missing tubules along with some relaxation of the tubules around such ‘vacancies’. The white arrow marks two theta-fibrils located at the very end of a row of tubules which can be best seen when looking at the micrograph from the upper-left under grazing incidence. Piedmont zone, Western Alps, Italy. (c) HRTEM image of parallel, loosely-packed, chrysotile fibrils with unequal outer diameters. Note the overgrowth of extra 0.7 nm thick layers (arrow heads) on chrysotile fibrils next to the largest ‘pore’ (O). Piedmont zone, Western Alps, Italy.

TEM images of different types of association of chrysotile tubules in asbes... Available to Purchase

Published: 01 October 2002
F ig . 12. TEM images of different types of association of chrysotile tubules in asbestiform serpentinite veins. ( a ) Entangled fibrils. Piedmont zone, Western Alps, Italy. ( b ) Parallel, close-packed fibrils with equal outer diameters. Note some isolated missing tubules along with some
Image
TEM images of different types of association of chrysotile tubules in asbestiform serpentinite veins. (a) Entangled fibrils. Piedmont zone, Western Alps, Italy. (b) Parallel, close-packed fibrils with equal outer diameters. Note some isolated missing tubules along with some relaxation of the tubules around such ‘vacancies’. The white arrow marks two theta-fibrils located at the very end of a row of tubules which can be best seen when looking at the micrograph from the upper-left under grazing incidence. Piedmont zone, Western Alps, Italy. (c) HRTEM image of parallel, loosely-packed, chrysotile fibrils with unequal outer diameters. Note the overgrowth of extra 0.7 nm thick layers (arrow heads) on chrysotile fibrils next to the largest ‘pore’ (O). Piedmont zone, Western Alps, Italy.

TEM images of different types of association of chrysotile tubules in asbes... Available to Purchase

Published: 01 October 2002
F ig . 12. TEM images of different types of association of chrysotile tubules in asbestiform serpentinite veins. ( a ) Entangled fibrils. Piedmont zone, Western Alps, Italy. ( b ) Parallel, close-packed fibrils with equal outer diameters. Note some isolated missing tubules along with some
Image
TEM images of different types of association of chrysotile tubules in asbestiform serpentinite veins. (a) Entangled fibrils. Piedmont zone, Western Alps, Italy. (b) Parallel, close-packed fibrils with equal outer diameters. Note some isolated missing tubules along with some relaxation of the tubules around such ‘vacancies’. The white arrow marks two theta-fibrils located at the very end of a row of tubules which can be best seen when looking at the micrograph from the upper-left under grazing incidence. Piedmont zone, Western Alps, Italy. (c) HRTEM image of parallel, loosely-packed, chrysotile fibrils with unequal outer diameters. Note the overgrowth of extra 0.7 nm thick layers (arrow heads) on chrysotile fibrils next to the largest ‘pore’ (O). Piedmont zone, Western Alps, Italy.

TEM images of different types of association of chrysotile tubules in asbes... Available to Purchase

Published: 01 October 2002
F ig . 12. TEM images of different types of association of chrysotile tubules in asbestiform serpentinite veins. ( a ) Entangled fibrils. Piedmont zone, Western Alps, Italy. ( b ) Parallel, close-packed fibrils with equal outer diameters. Note some isolated missing tubules along with some
Image
FIGURE 4—Tubules, threads, and grumeaux. (A) Thread-like (upper arrow) and tubular (lower arrow) filaments, all with thick cement rinds. KEC, Stage III talus. (B) Filamentous calcimicrobes preserved as thin-walled, micritic tubules with sparry occluding cement and fibrous cement rind (central arrow). Several cross-sections of fibrous cement-encrusted tubules also are visible (e.g., upper arrow). AR, Stage Vii reef-margin lamelliform stromatolites. (C) Grumelous microstructure with vestiges of filamentous morphology in many grumeaux. Boxed area enlarged in D. KEC, Stage III talus. (D) Grumeaux, with diffuse margins. (E) Densely packed grumeaux with elongate shapes reminiscent of filaments. Left half is sparse-filament lamina; right half is dense-filament lamina. Depositional up is to right. KEC, Stage III talus. (F) Streaks of micrite resulting from poor preservation of densely packed prostrate filaments. KEC, Stage III talus. All photos are thin sections in PPL

FIGURE 4 —Tubules, threads, and grumeaux. (A) Thread-like (upper arrow) and... Available to Purchase

Published: 01 April 2000
FIGURE 4 —Tubules, threads, and grumeaux. (A) Thread-like (upper arrow) and tubular (lower arrow) filaments, all with thick cement rinds. KEC, Stage III talus. (B) Filamentous calcimicrobes preserved as thin-walled, micritic tubules with sparry occluding cement and fibrous cement rind (central
Image
—(a) Photograph of the lower part of a paleosol K horizon with root tubules and root casts. Paleosol is from northeast quarter of the northwest quarter of the northwest quarter of Sec. 31, T8N, R9W in the northern part of Deer Lodge Valley. Film cap is 35 mm in diameter. (b) Photograph of the lower part of a paleosol K horizon displaying skeletal grains floating in fine-grained carbonate matrix. Lens cap is 67 mm in diameter. Paleosol is located in the northeast quarter of the northwest quarter of the northwest quarter of Sec. 31, T8N, R9W, Deer Lodge Valley, Montana.

—(a) Photograph of the lower part of a paleosol K horizon with root tubules... Available to Purchase

Published: 01 September 1994
Figure 3 —(a) Photograph of the lower part of a paleosol K horizon with root tubules and root casts. Paleosol is from northeast quarter of the northwest quarter of the northwest quarter of Sec. 31, T8N, R9W in the northern part of Deer Lodge Valley. Film cap is 35 mm in diameter. (b) Photograph
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Transverse (1–7) and longitudinal thin sections (8, 9) of Halysites catenularius. (1) Polygonal lacunae; (2) elongated lacunae (white and black arrows point to rank junctions at lateral corallite wall and tubule, respectively); (3) corallite with low ratio of tabularium length to width (note the presence of septal spines, and balken structures in the common wall); (4) corallite with high ratio of tabularium length to width (note the irregular tubule in the junction area of three corallites and rectangular tubule on the right); (5) common wall of two corallites (note the absence of a tubule and presence of balken structures); (6) balken structures in the junction area of three corallites (arrow points to a tiny tubule in the center of the balken structures); (7) rectangular and narrow tubules on the left and right sides of a corallite; (8) growth pattern of tabulae in corallites and tubules (arrow points to an interval of abnormal spacing and appearance of tabulae in corallites related to rejuvenation after damage); (9) interstitial increase (arrows point to the development of juvenile corallites from tubules). (1, 3) GIT 806-8; (2, 4–7) GIT 806-4; (8) GIT 806-11; (9) GIT 806-9.

Transverse (1–7) and longitudinal thin sections (8, 9) of Halysites ca... Available to Purchase

Published: 01 March 2019
Figure 5. Transverse (1–7) and longitudinal thin sections (8, 9) of Halysites catenularius . (1) Polygonal lacunae; (2) elongated lacunae (white and black arrows point to rank junctions at lateral corallite wall and tubule, respectively); (3) corallite with low ratio of tabularium
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Box plots of interior vs. exterior diameters of Aphralysia anfracta n. sp. specimens measured in nine photomicrographs imaged from Woodville-mound thin sections. Five of the images contained many contorted tubules (&gt; 20% of the total counted). Two were characterized by few contorted tubules (&lt; 20% of the total counted). We did not distinguish between contorted and noncontorted tubules in two of the images (undifferentiated tubules). Measurements listed in Supplementary Data 2.

Box plots of interior vs. exterior diameters of Aphralysia anfracta n. sp... Available to Purchase

Published: 01 May 2020
Figure 12. Box plots of interior vs. exterior diameters of Aphralysia anfracta n. sp. specimens measured in nine photomicrographs imaged from Woodville-mound thin sections. Five of the images contained many contorted tubules (> 20% of the total counted). Two were characterized by few
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A: Dendritic pyroxene quench crystallites (scanning electron microscopy, SEM; backscattered electron microscopy, BSE; sample RI_09_006). B: Solid tubules with complex curvatures including spirals (white arrow; SEM BSE; sample RI_10_009A1). C: Tubular feature with abrupt directional changes (SEM BSE; sample RI_10_009A1). D: Tubules associated with fractures and clast margins that display evidence of hydrothermal alteration (sample RI_10_013 5 m; white arrows). E: Segmented tubules (black arrow) and branching tubules (white arrow; sample RI_00_056). F: Tubules associated with film-like material (SEM BSE; sample RI_09_006).

A: Dendritic pyroxene quench crystallites (scanning electron microscopy, SE... Available to Purchase

Published: 01 June 2014
Figure 1. A: Dendritic pyroxene quench crystallites (scanning electron microscopy, SEM; backscattered electron microscopy, BSE; sample RI_09_006). B: Solid tubules with complex curvatures including spirals (white arrow; SEM BSE; sample RI_10_009A1). C: Tubular feature with abrupt directional
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Thin-section photomicrographs of Aphralysia anfracta n. sp.: (1) tubules (arrows) wandering through enclosing fine sediment, patchily coated with microcrystalline carbonate (thin section GSA-M265); (2) forms characterized by small equant vesicles in gently curving lines (box) and sinuous tight curves (arrows); some tubules in contact with a large calcitic mass (a) have been partially overprinted, suggesting postgrowth neomorphic alteration of a former skeletal allochem (thin section GSA-I33006). (3) holotype, Aphralysia anfracta n. sp. boundstone illustrating possible examples of branched tubules (a), a wide size range of tubules, and tightly curved areas (b); the image also contains a possible longitudinal cross section through a specimen of Problematicum A (c) (thin section GSA-M263). Figures 8.1–8.3 each show multiple examples of tightly curved segments of Aphralysia anfracta n. sp.

Thin-section photomicrographs of Aphralysia anfracta n. sp.: ( 1 ) tubule... Available to Purchase

Published: 01 May 2020
Figure 8. Thin-section photomicrographs of Aphralysia anfracta n. sp.: ( 1 ) tubules (arrows) wandering through enclosing fine sediment, patchily coated with microcrystalline carbonate (thin section GSA-M265); ( 2 ) forms characterized by small equant vesicles in gently curving lines (box
Journal Article

TUBE WORM FOSSILS OR RELIC METHANE EXPULSING CONDUITS? Available to Purchase

FEDERICO F. KRAUSE, JESSE CLARK, SELIM G. SAYEGH, RENEE J. PEREZ
Journal: PALAIOS
Published: 01 January 2009
PALAIOS (2009) 24 (1): 41–50.
DOI: https://doi.org/10.2110/palo.2008.p08-040r
... limestones with tubules. On the inside these tubules have an outer ring of micrite with microparticulate siliciclastic materials and a core of calcite cement. Alternatively, they have an outer annulus of calcite cement and a core of microparticulate siliciclastic materials with calcite cements. Interestingly...
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Thin-section photomicrographs of skeletal stromatolites in Unit 2. A, B) Well-preserved skeletal stromatolites in matrix. Boxes in Figure 4B indicate positions of figure parts C and D. C) Laminated light and dark spar between tubules, near terminal growth surface. D) Falsely branched tubule (arrow) near terminal growth surface. E) Transverse surface of skeletal stromatolite with honeycomb appearance. Two tubules are indicated with arrows. F) Matrix with numerous hollow spheres (S) and fragmented pieces of charophytes (C) and skeletal stromatolites (M).

Thin-section photomicrographs of skeletal stromatolites in Unit 2. A, B) ... Available to Purchase

Published: 01 February 2006
Figure 4 Thin-section photomicrographs of skeletal stromatolites in Unit 2. A, B) Well-preserved skeletal stromatolites in matrix. Boxes in Figure 4B indicate positions of figure parts C and D. C) Laminated light and dark spar between tubules, near terminal growth surface. D) Falsely
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Photomicrographs showing examples of bioalteration textures in basaltic glass from in situ oceanic crust, from the Ontong Java Plateau (OJP). (a) Glass shard concentrically rimmed by palagonite (Pal) produced by abiotic alteration of glass. (b) Bioalteration along a crack within the glass grain, including examples of granular texture (GT) and a segmented tubule (Seg). (c) Tubules extending away from the edge of the glass shard into fresh glass. (d) Examples of a tubule exhibiting spiral form (Sp). Very fine-grained authigenic minerals including titanite partially fill many of the bioalteration textures.

Photomicrographs showing examples of bioalteration textures in basaltic gla... Available to Purchase

Published: 01 October 2010
the glass grain, including examples of granular texture (GT) and a segmented tubule (Seg). (c) Tubules extending away from the edge of the glass shard into fresh glass. (d) Examples of a tubule exhibiting spiral form (Sp). Very fine-grained authigenic minerals including titanite partially fill many
Journal Article

Calcified algae as sediment contributors to early Paleozoic limestones; evidence from deep-water sediments of the Cow Head Group, western Newfoundland Available to Purchase

Mario Coniglio, Noel P. James
Published: 01 September 1985
Journal of Sedimentary Research (1985) 55 (5): 746–754.
DOI: https://doi.org/10.1306/212F87D8-2B24-11D7-8648000102C1865D
... in fine-grained, thin-bedded slope limestones include abundant Girvanella , as single tubules, rafts of intertwined tubules, oncolites, and intraclasts. Integration of petrographic information from the boulders and fine-grained limestones indicates that many micritic peloids of silt to very fine sand size...
View PDF for article title, Calcified algae as sediment contributors to early Paleozoic limestones; evidence from deep-water sediments of the Cow Head Group, western Newfoundland
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Journal Article

Algal Origin of Peloids, Peloidal Intraclasts, and Structure Grumeleuse in Paleozoic Limestones: Evidence from Cow Head Group, Western Newfoundland: ABSTRACT Free

M. Coniglio, N. P. James
Journal: AAPG Bulletin
Published: 01 April 1984
AAPG Bulletin (1984) 68 (4): 464–465.
DOI: https://doi.org/10.1306/AD460BED-16F7-11D7-8645000102C1865D
...-water clasts within both conglomerates and deep-water slope sediments. Large boulders contain sheets of Girvanella and arborescent clusters of Epiphyton , but only Girvanella as intraclasts, rafts of intertwined tubules, single tubules, and oncolites can be distinguished in calcarenites. Preservation...
View PDF for article title, Algal Origin of Peloids, Peloidal Intraclasts, and Structure Grumeleuse in Paleozoic Limestones: Evidence from Cow Head Group, Western Newfoundland: ABSTRACT
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Journal Article

Distribution of microborings within continental margin sediments of the southeastern United States Available to Purchase

Brain D. Edwards, Ronald D. Perkins
Published: 01 December 1974
Journal of Sedimentary Research (1974) 44 (4): 1122–1135.
DOI: https://doi.org/10.1306/212F6C53-2B24-11D7-8648000102C1865D
... microborings, 1-4 mu m in diameter, of fungal origin, (2) stellate microborings with centric cavities 40-50 mu m in diameter, also of fungal origin, (3) radiate microborings, comprising clusters of tubules, 8-10 mu m in diameter, produced by a septate green alga, (4) tubulate microborings, 15-20 mu m...
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Journal Article

Textures and Structures in Catahoula (Gueydan) Tuff, South-Central Texas: ABSTRACT Free

Earle F. McBride
Journal: AAPG Bulletin
Published: 01 March 1966
AAPG Bulletin (1966) 50 (3): 624.
DOI: https://doi.org/10.1306/5D25B537-16C1-11D7-8645000102C1865D
..., probably in an arid climate with seasonal rainfall. Many pisolites were reworked into successive mud flows. Another variety of tuff is well indurated and pervaded by sinuous tubules (up to 2 mm. in diameter) probably formed by plant roots. The tubules trend in all directions but are predominantly vertical...
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SUMMARY OF TUBULE CHARACTERISTICS Note: Descriptors and characterist... Available to Purchase

Published: 01 June 2014
TABLE 1. SUMMARY OF TUBULE CHARACTERISTICS Note: Descriptors and characteristic categories are after Fisk and McLoughlin (2013) . Observations are sorted by microscopy method. Optical observations are separated based on margin character and scanning electron microscopy (SEM) observations