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ECHINODERM FRAGMENT: Up. Permian (Kazanian?) Wegener Halvo Fm., Jameson Land, East Greenland. An echinoderm fragment with an extensive syntaxial overgrowth. Staining indicates that overgrowth cementation persisted through a significant time period during which poor fluids became progressively more reducing (thereby incorporating more iron into the calcite lattice). Later, even more ferroan calcite cements postdate the overgrowth. The transition from surficial to burial cementation lies somewhere in the overgrowth, but isotopic, fluid-inclusion, or other geochemical data is required to clarify these relationships. Chapter 22: CARBONATE DIAGENESIS: Meo- and Telogenetic Burial Diagenesis; p. 366. Memoir 77: A Color Guide to the Petrography of Carbonate Rocks: Grains, textures, porosity, diagenesis by Peter A. Scholle and Dana S. Ulmer-Scholle
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ECHINODERM FRAGMENT: Up. Permian (Kazanian?) Wegener Halvo Fm., Jameson Land, East Greenland. An echinoderm fragment with an extensive syntaxial overgrowth. Staining indicates that overgrowth cementation persisted through a significant time period during which poor fluids became progressively more reducing (thereby incorporating more iron into the calcite lattice). Later, even more ferroan calcite cements postdate the overgrowth. The transition from surficial to burial cementation lies somewhere in the overgrowth, but isotopic, fluid-inclusion, or other geochemical data is required to clarify these relationships. Chapter 22: CARBONATE DIAGENESIS: Meo- and Telogenetic Burial Diagenesis; p. 366. Memoir 77: A Color Guide to the Petrography of Carbonate Rocks: Grains, textures, porosity, diagenesis by Peter A. Scholle and Dana S. Ulmer-Scholle