Crystal alteration in a living calcareous alga (Halimeda

Abstract. Although calcification processes and the carbonate deposits in Halimeda have been described in many papers, previous workers have failed to recognize that a reorganization of crystals occurs within living individuals of common species of this alga.

Ocean acidification alters the calcareous microstructure

Macintyre IG, Reid RP (1995) Crystal alteration in a living calcareous alga (Halimeda): implications for studies in skeletal diagenesis. J Sediment Res A65:143–153 Google Scholar Manzello DP, Kleypas JA, Budd DA, Eakin CM, Glynn PW, Langdon C (2008) Poorly cemented coral reefs of the eastern tropical Pacific: possible insights into reef development in a high-CO 2 world.

Sediment generation by Halimeda on atoll interior coral

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However, given the relevance of Halimeda spp. to overall carbonate sediment budgets (e.g., Drew, 1983), and that ongoing ecological and environmental changes may increase Halimeda plant abundances (e.g., Shulman and Robertson, 1996, Ferrari et al., 2012) and possibly alter the relative abundances of Halimeda spp., this is a major knowledge gap.

AAPG Datapages/Archives: Crystal Alteration in a Living

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Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes Vol. 65A (1995) No. 1. (January), Pages 143-153 Crystal Alteration in a Living Calcareous Alga (Halimeda): Implications for Studies in Skeletal Diagenesis

Veröffentlicht in:Journal of Sedimentary Research · 1995Autoren:Ian G Macintyre · R Pamela ReidZugehörigkeit: Smithsonian Institution · University of Miami

Production of lime mud by breakdown of foraminiferal tests

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Halimeda provides euhedral needles (1–15 μm in length), and anhedral equant crystallites (0.1–0.5 μm in size) . However, these elements are aragonitic. Red algae provide a large amount of small Mg-calcite columns where crystallites are discernible . Therefore, it is quite difficult to evaluate the relative contribution of different organisms in the formation of carbonate mud.

Carbonate recrystallization in shallow marine environments

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Crystal Alteration in a Living Calcareous Alga (Halimeda): Implications for Studies in Skeletal Diag January 1995 · Journal of Sedimentary Research View full-text

Effects of secular variation in seawater Mg/Ca ratio

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Increased production of calcite and slower growth for the major sediment-producing alga Halimeda as the Mg/Ca ratio of seawater is lowered to a “calcite sea” level. J. Sed.

Micritization | SpringerLink

Macinytre and Reid also discovered that the original skeletal needles of the green alga Halimeda incrassata (Macintyre and Reid, 1995) and the porcelaneous foraminifera Archaias angulatis (Macintyre and Reid, 1998) are recrystallizing to minimicrite (crystals <1 µm after Folk, 1974) while these organisms are still alive (Figure M11(A),(B)).

MORPHOLOGY AND DIAGENESIS OF DIMORPHOSIPHON …

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Crystal alteration in a living calcareous alga (Halimeda): Implications for studies in skeletal diagenesis. Journal of Sedimentary Research A65: 143 – 153 . Google Scholar

Veröffentlicht in:Journal of Paleontology · 2007Autoren:Donald W BoydZugehörigkeit: University of Wyoming

The contribution of calcareous green algae to the

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— Crystal alteration in a living calcareous alga (Halimeda): implications for studies in skeletal diagenesis. Journal of Sedimentary Research 65 (1): 143 – 153 . Google Scholar

Veröffentlicht in:Geodiversitas · 2012Autoren:Bruno GranierZugehörigkeit: University of Western BrittanyÜber:Aragonite · Bryopsidales · Halimeda · Calcite · Cementation · Dasycladales