[Rockhounds] Fossiliferous concretion formation over week-month timescales

[Peter Richards]

I was taught that concretion formation was due to interaction between chemicals produced in the decay of organisms and the carbonate chemistry around it, and that this took place quite quickly.  Not sure they were saying days or weeks, but not geological time scales.  This was the accepted understanding in the late 1960’s among my paleo professors.  The old is new again!

Pete Richards
___________________________
R. Peter Richards, Ph.D.
rpr at heidelberg.edu
Morphological Crystallographer

> On Jul 23, 2020, at 3:09 PM, Tim Fisher <nospam at orerockon.com> wrote:
> 
> I LOVE THIS! I'm sick and tired of being told it takes eons for a concretion
> to form when it's been shown that it isn't necessarily the case. I just
> didn't have the ref for the paper. 
> 
> Tim Fisher
> Http://OreRockOn.com 
> Email nospam at orerockon.com
> 
> -----Original Message-----
> From: Rockhounds [mailto:rockhounds-bounces at rockhounds.drizzle.com] On
> Behalf Of Paul
> Sent: Thursday, July 23, 2020 7:41 AM
> To: Rockhound List
> Subject: [Rockhounds] Fossiliferous concretion formation over week-month
> timescales
> 
> Yoshida, H., Ujihara, A., Minami, M., Asahara, Y., Katsuta, N., Yamamoto,
> K., Sirono, S.I., Maruyama, I., Nishimoto, S. and Metcalfe, R., 2015. Early
> post- mortem formation of carbonate concretions around tusk-shells over
> week-month timescales.
> Scientific reports, 5, no. 14123. Open access
> https://www.nature.com/articles/srep14123
> 
> Nagoya University PDF link
> http://www3.arkw.co.jp/nagoya-u/museum/dora_yoshida/pdf/article/a84.pdf
> 
> Researchgate PDF link
> https://www.researchgate.net/publication/281777077_Early_post-mortem_formati
> on_of_carbonate_concretions_around_tusk-shells_over_week-month_timescales
> 
> More papers by Ippei Maruyama
> https://www.researchgate.net/profile/Ippei_Maruyama
> 
> More papers by Hidekazu Yoshida
> https://www.researchgate.net/profile/Hidekazu_Yoshida
> 
> Related papers:
> 
> Yoshida, H., Yamamoto, K., Minami, M., Katsuta, N., Sin-ichi, S. and
> Metcalfe, R., 2018. Generalized conditions of spherical carbonate concretion
> formation around decaying organic matter in early diagenesis. Scientific
> reports, 8(1), pp.1-10. Open access
> https://www.nature.com/articles/s41598-018-24205-5/
> 
> Another PDF link for paper
> https://d-nb.info/1161507884/34
> 
> Researchgate PDF link
> https://www.researchgate.net/publication/324654876_Generalized_conditions_of
> _spherical_carbonate_concretion_formation_around_decaying_organic_matter_in_
> early_diagenesis
> 
> Yoshida, H., Asahara, Y., Yamamoto, K., Katsuta, N., Minami, M. and
> Metcalfe, R., 2019. 87 Sr/86 Sr age determination by rapidly formed
> spherical carbonate concretions. Scientific reports, 9(1), pp.1-7. Open
> access
> https://www.nature.com/articles/s41598-019-38593-9
> 
> Researchgate PDF link
> https://www.researchgate.net/publication/330737629_87Sr86Sr_age_determinatio
> n_by_rapidly_formed_spherical_carbonate_concretions
> 
> Publisher Correction
> https://www.researchgate.net/publication/332941884_Publisher_Correction_87Sr
> 86Sr_age_determination_by_rapidly_formed_spherical_carbonate_concretions
> 
> More papers by Hidekazu Yoshida
> https://www.researchgate.net/profile/Hidekazu_Yoshida
> 
> Yours,
> 
> Paul H.
> 
> 
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