Hydrothermal alteration of aragonitic biocarbonates: assessment of micro- and nanostructural dissolution–reprecipitation and constraints of diagenetic overprint from quantitative statistical grain-area analysis

Casella, Laura A.; He, Sixin; Griesshaber, Erika; Fernández-Díaz, Lourdes; Greiner, Martina; Harper, Elizabeth M.; Jackson, Daniel J.; Ziegler, Andreas; Mavromatis, Vasileios; Dietzel, Martin; Eisenhauer, Anton; Veintemillas-Verdaguer, Sabino; Brand, Uwe; Schmahl, Wolfgang W.

doi:https://doi.org/10.5194/bg-15-7451-2018

Articles | Volume 15, issue 24

Biogeosciences, 15, 7451–7484, 2018

https://doi.org/10.5194/bg-15-7451-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Biogeosciences, 15, 7451–7484, 2018

https://doi.org/10.5194/bg-15-7451-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 15, issue 24

Research article 21 Dec 2018

Research article | 21 Dec 2018

Hydrothermal alteration of aragonitic biocarbonates: assessment of micro- and nanostructural dissolution–reprecipitation and constraints of diagenetic overprint from quantitative statistical grain-area analysis

Laura A. Casella et al.

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Cumulative views and downloads (calculated since 10 Jul 2018)

Month	HTML	PDF	XML	Total
Jul 2018	156	25	1	182
Aug 2018	35	12	0	47
Sep 2018	9	11	0	20
Oct 2018	25	6	0	31
Nov 2018	27	20	0	47
Dec 2018	227	32	4	263
Jan 2019	206	38	0	244
Feb 2019	30	18	5	53
Mar 2019	27	22	2	51
Apr 2019	13	11	2	26
May 2019	21	17	5	43
Jun 2019	34	13	3	50
Jul 2019	12	15	3	30
Aug 2019	5	11	4	20
Sep 2019	7	11	5	23
Oct 2019	33	13	5	51
Nov 2019	9	7	2	18
Dec 2019	11	9	7	27
Jan 2020	13	16	4	33
Feb 2020	11	6	4	21
Mar 2020	6	6	3	15
Apr 2020	17	5	6	28
May 2020	13	9	6	28
Jun 2020	20	16	5	41
Jul 2020	20	27	9	56
Aug 2020	11	13	3	27
Sep 2020	17	12	5	34
Oct 2020	8	9	3	20
Nov 2020	14	16	7	37
Dec 2020	14	18	7	39
Jan 2021	25	22	9	56
Feb 2021	8	9	6	23

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Short summary

Biogenic carbonates record past environmental conditions. Fossil shell chemistry and microstructure change as metastable biogenic carbonates are replaced by inorganic calcite. Simulated diagenetic alteration at 175 °C of different shell microstructures showed that (nacreous) shell aragonite and calcite were partially replaced by coarse inorganic calcite crystals due to dissolution–reprecipitation reactions. EBSD maps allowed for qualitative assessment of the degree of diagenetic overprint.

Article

Hydrothermal alteration of aragonitic biocarbonates: assessment of micro- and nanostructural dissolution–reprecipitation and constraints of diagenetic overprint from quantitative statistical grain-area analysis

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