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Biomineralizations are processes that result in the formation of minerals and amorphous compounds, generated as a consequence of metabolic activity, known as biominerals and biomineraloids. They have accompanied the biological evolution and are present at all levels of the biosphere. Compounds containing calcium, iron, and silicon are among the most common biomineralizations, distributed globally. This article presents a summarized review and new contributions of mineral-chemical studies of biominerals and biomineraloids, present in coastal pedosedimentary sequences of the southeastern Buenos Aires province. Disturbed and undisturbed samples were analyzed mineralogically, at mesoscopic, microscopic, and submicroscopic scales. The presence of iron in framboidal and polyframboidal pyrites associated with gypsum, barite, calcite, halite, and iron oxyhydroxides in paleo and current marshes, allowed to define redoximorphic conditions, associated with sea-level oscillations during the Holocene. Calcium biomineralizations enabled to define the genetic sequence of oxalates, sulfates, and carbonates, associated with diverse microorganisms and plants, many of which have induced different and intense bioerosion processes. Silica biomineraloids are abundant in diverse levels of pedological sequences, being essential to define past plant communities, dominated by C3 and C4 grasses. In the Late Pliocene levels of the complex paleosoils, the presence of typical Arecaceae silicophytoliths was found for the first time, indicating warm and humid environmental conditions in the study area. Biomineralizations studies have contributed to a better understanding of taphonomic, biogeochemical, and palaeoenvironmental processes; which allows predicting negative environmental changes in coastal areas, and to prevent improper management of these environments. Due the scientific gap regarding the biomineralizations, a multidisciplinary approach is recommended. This approach involves interaction between different disciplines on a permanent basis, with the objective of acquiring further information about their role in different environments.

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Biomineralizations of Iron, Calcium, and Amorphous Silica, Their Role in the Paleoenvironmental Reconstruction of Pedosedimentary Sequences of the Late Cenozoic in the Southeast of the Pampean Plain

  • 章节

  • 发表日期：

    2026年

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  • Celia Frayssinet,
  • Lucrecia Frayssinet,
  • Margarita Osterrieth,
  • Juan I. Cresta,
  • Mariana Fernandez Honaine,
  • María Laura Benvenuto,
  • Matías Taglioretti,
  • María Fernanda Alvarez,
  • Roberto Donna,
  • Natalia L. Borrelli

摘要

Biomineralizations are processes that result in the formation of minerals and amorphous compounds, generated as a consequence of metabolic activity, known as biominerals and biomineraloids. They have accompanied the biological evolution and are present at all levels of the biosphere. Compounds containing calcium, iron, and silicon are among the most common biomineralizations, distributed globally. This article presents a summarized review and new contributions of mineral-chemical studies of biominerals and biomineraloids, present in coastal pedosedimentary sequences of the southeastern Buenos Aires province. Disturbed and undisturbed samples were analyzed mineralogically, at mesoscopic, microscopic, and submicroscopic scales. The presence of iron in framboidal and polyframboidal pyrites associated with gypsum, barite, calcite, halite, and iron oxyhydroxides in paleo and current marshes, allowed to define redoximorphic conditions, associated with sea-level oscillations during the Holocene. Calcium biomineralizations enabled to define the genetic sequence of oxalates, sulfates, and carbonates, associated with diverse microorganisms and plants, many of which have induced different and intense bioerosion processes. Silica biomineraloids are abundant in diverse levels of pedological sequences, being essential to define past plant communities, dominated by C3 and C4 grasses. In the Late Pliocene levels of the complex paleosoils, the presence of typical Arecaceae silicophytoliths was found for the first time, indicating warm and humid environmental conditions in the study area. Biomineralizations studies have contributed to a better understanding of taphonomic, biogeochemical, and palaeoenvironmental processes; which allows predicting negative environmental changes in coastal areas, and to prevent improper management of these environments. Due the scientific gap regarding the biomineralizations, a multidisciplinary approach is recommended. This approach involves interaction between different disciplines on a permanent basis, with the objective of acquiring further information about their role in different environments.