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neomorphism

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Journal Article
Published: 15 June 2007
Canadian Journal of Earth Sciences (2007) 44 (5): 695–705.
... carbonate and the Whitkow anhydrite. The average 87 Sr/ 86 Sr ratio of the MVC calcite is 0.7078, comparable to that of Middle Devonian seawater. The Ratner MVC limestone is interpreted to result from neomorphism of the precursor microcrystalline lime mudstone in burial environments, and neomorphic fluids...
FIGURES | View All (9)
Series: SEPM Special Publication
Published: 01 January 2003
DOI: 10.2110/pec.03.78.0395
EISBN: 9781565763340
... Dublin Basin after mid-Chadian time. The letters A-D correspond to the localities on the section line depicted in Figure 1 Irish Midlands Dublin Basin Methods Previous Dolomitization Studies Neomorphism General Planar and Nonplanar Dolomite Petrography Fig. 3...
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Journal Article
Published: 01 January 2000
Journal of Sedimentary Research (2000) 70 (1): 265–274.
.... Ferroan dolomite has relatively low δ 18 O values (−5.1 to −7.3‰ PDB) and has slightly radiogenic 87 Sr/ 86 Sr ratios (0.70915 to 0.70969) similar to those obtained for the overlying Maquoketa Shale. These data indicate that ferroan dolomite formed by neomorphism of nonferroan planar dolomite as fluids...
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Journal Article
Journal: AAPG Bulletin
Published: 01 June 1997
AAPG Bulletin (1997) 81 (6): 954–977.
...Scott Durocher; Ihsan S. Al-Aasm ABSTRACT Petrographic, chemical, and isotopic studies of the Mississippian (Visean) upper Debolt Formation in the Blueberry field, British Columbia, Canada, reveal that dolomitization was the result of several diagenetic events and that neomorphic alteration...
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Journal Article
Published: 02 January 1995
Journal of Sedimentary Research (1995) 65 (1a): 214–224.
...James P. Hendry; Peter W. Ditchfield; James D. Marshall Abstract Aragonitic bivalves in Middle Jurassic paralic limestones from Lincolnshire (Eastern England) have been neomorphically replaced by inclusion-rich calcite spar. Textural features of neomorphic spar are analogous to examples from other...
Journal Article
Published: 01 July 1990
Journal of Sedimentary Research (1990) 60 (4): 549–562.
..., basinal fluids. These data indicate that the back reef facies was subjected to a complex diagenetic history involving both early and late diagenetic dolomitization and dolomite neomorphism. Fine crystalline, planar dolomite was formed during early diagenetic dolomitization of the cryptalgalaminate...
Journal Article
Published: 01 March 1986
Journal of Sedimentary Research (1986) 56 (2): 194–203.
...Gale D. Martin; Bruce H. Wilkinson; Kyger C. Lohmann Abstract The neomorphism of aragonite to calcite involves complex textural and chemical alterations that are in part controlled by the degree of communication between diagenetic and ambient formation fluids. Two taxa, Montastrea annularis...
Book Chapter

Author(s)
Peter A. Scholle
Series: AAPG Memoir
Published: 01 January 1978
DOI: 10.1306/M27394C27
EISBN: 9781629811994
Journal Article
Published: 01 June 1967
Journal of Sedimentary Research (1967) 37 (2): 688–690.
...S. K. Chanda Abstract In microcrystalline allochemical limestones and biolithites, sharp fabric discontinuities or boundaries may be anticipated as a result of an aggrading neomorphism. Such discontinuities are commonly caused by structural discontinuities in the initial fabric, that is, boundaries...
Journal Article
Published: 01 September 1982
Journal of Sedimentary Research (1982) 52 (3): 843–847.
...Mark Rich Abstract Cortices of ooids in a bed in the upper part of the Bangor Limestone (Upper Mississippian) in northwestern Georgia are composed of neomorphic pseudospar which is mostly in a mosaic pattern but also occurs as single crystals in crystallographic continuity with nuclei consisting...
Journal Article
Published: 01 April 1983
Journal of the Geological Society (1983) 140 (2): 229–237.
...R. G. C. Bathurst Abstract Thinly-bedded Upper Bathonian grainstones with shales, in Wiltshire, UK, have intergranular spar of 2 kinds, a primary calcite cement and a neomorphic spar that has replaced an earlier fibrous cement. The earlier cemented grainstones have been less compacted than those...
Image
Sketch diagram showing that neomorphism of the Ratner limestone is interpreted to be related to gypsum-dehydration water. Dehydration water from the thick Whitkow sulfate beds could be squeezed into the underlying Ratner carbonate rocks because the overlying Prairie Evaporite halite is impermeable. The gypsumdehydration water might have migrated updip. 1, Ratner laminated carbonates; 2, Ratner anhydrite; 3, Whitkow anhydrite; 4, migration direction of gypsum-dehydration water.
Published: 15 June 2007
Fig. 9. Sketch diagram showing that neomorphism of the Ratner limestone is interpreted to be related to gypsum-dehydration water. Dehydration water from the thick Whitkow sulfate beds could be squeezed into the underlying Ratner carbonate rocks because the overlying Prairie Evaporite halite
Image
Glauconite and Pyrite, and Porosity.
Published: 01 April 2007
Plate 7: Glauconite and Pyrite, and Porosity. 7.1: Neomorphism within the matrix (stained) with plotches of pyrite, well Bai Hassan-81 (1,425.2 m), Mushorah Formation, sequence C3, X37. 7.2: Framboidal glauconite, well Quwair-2 (993–994 m), Mushorah Formation, sequence C3, X38. 7.3: High
Image
—Solution and neomorphism in freshwater phreatic zone. A, Solution of aragonitic oolites following cementation by equant calcite in active freshwater phreatic zone. Sample from Pleistocene Miami Oolite, south Florida. B, Aragonite needles in oolite being replaced by blocky equant calcite. Such neomorphism is common in freshwater phreatic environment, but can also occur in vadose zone in humid climates.
Published: 01 April 1980
Fig. 15 —Solution and neomorphism in freshwater phreatic zone. A , Solution of aragonitic oolites following cementation by equant calcite in active freshwater phreatic zone. Sample from Pleistocene Miami Oolite, south Florida. B , Aragonite needles in oolite being replaced by blocky equant
Image
—Dolomitization through aggrading coalescive neomorphism.
Published: 01 April 1977
Fig. 13 —Dolomitization through aggrading coalescive neomorphism.
Image
—Dolomitization through porphyroid neomorphism at very early stage of development. Few, incompletely formed, dolomite rhombs are present (X-nicols).
Published: 01 April 1977
Fig. 12 —Dolomitization through porphyroid neomorphism at very early stage of development. Few, incompletely formed, dolomite rhombs are present (X-nicols).
Image
—In situ neomorphism of gastropod. Note difference of this rather classic recrystallization fabric (see Folk, 1965) with fabric which results from microspar precipitation into moldic pore space in Figure 14. Thin-section photomicrograph, plane light; 17-64.
Published: 01 June 1974
FIG. 17 — In situ neomorphism of gastropod. Note difference of this rather classic recrystallization fabric (see Folk, 1965 ) with fabric which results from microspar precipitation into moldic pore space in Figure 14 . Thin-section photomicrograph, plane light; 17-64.
Published: 01 January 1995
DOI: 10.1130/0-8137-2300-0.233
Journal Article
Published: 01 April 2009
Journal of Sedimentary Research (2009) 79 (4): 226–246.
... material resulting from collapse of dissolved shells. Specifically, five types of aragonite preservation are evident: (a) skeletons with original aragonite; (b) skeletons with original aragonite but with leaching cavities; (c) skeletons with aragonite relics encased in either dirty or pale brown neomorphic...
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Image
Model depicting the timing and complex aragonite alteration pathways envisaged for the Plio-Pleistocene cool-water limestones in the central Hawke's Bay region in relation to the timing of their diagenetic evolution from shallow marine to burial to uplift-related meteoric environments. The schematic representation of various aragonite alteration scenarios takes into account all the significant neomorphic fabrics observed in thin sections, and with respect to their likely chronological occurrence. It shows that neomorphism of metastable mineralogies involves a multiphase history. Thus alteration may have started in the pre-compaction diagenetic phase under the influence of marine waters, and then continued or developed under the influence of post-compaction reducing waters, and was further prolonged with the ingress of meteoric waters during uplift and exhumation of the sediment pile that promoted pervasive dissolution. Modes of aragonite neomorphism are related to a number of controlling parameters discussed in the text. The model shows that the differing neomorphic fabrics may have formed at any time during the diagenetic history of the host limestones, suggesting that the shell microstructures controlling the nature of the intraskeletal neomorphic front, and the openness of the diagenetic system in addition to the fluid chemistry, were of greater importance in determining neomorphic fabrics and relic preservation than was the general diagenetic environment.
Published: 01 April 2009
. The schematic representation of various aragonite alteration scenarios takes into account all the significant neomorphic fabrics observed in thin sections, and with respect to their likely chronological occurrence. It shows that neomorphism of metastable mineralogies involves a multiphase history. Thus