Title |
Generalized conditions of spherical carbonate concretion formation around decaying organic matter in early diagenesis
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Published in |
Scientific Reports, April 2018
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DOI | 10.1038/s41598-018-24205-5 |
Pubmed ID | |
Authors |
Hidekazu Yoshida, Koshi Yamamoto, Masayo Minami, Nagayoshi Katsuta, Sirono Sin-ichi, Richard Metcalfe |
Abstract |
Isolated spherical carbonate concretions observed in marine sediments are fascinating natural objet trouve because of their rounded shapes and distinct sharp boundaries. They occur in varied matrices and often contain well preserved fossils. The formation process of such concretions has been explained by diffusion and rapid syn-depositional reactions with organic solutes and other pore water constituents. However, the rates, conditions and formation process of syngenetic spherical concretions are still not fully clear. Based on the examination of different kinds of spherical concretions from several locations in Japan, a diffusion based growth diagram was applied to define the generalized growth conditions of spherical concretions formed around decaying organic matter. All analytical data imply that the spherical concretions formed very rapidly, at least three to four orders of magnitude faster than previously estimated timescales. The values indicate that spherical concretions are preferentially grown within clay- to silt-grade marine sediments deposited in relatively deep (a few tens of metres) environments dominated by diffusive solute transport, very early in diagenesis. |
X Demographics
Geographical breakdown
Country | Count | As % |
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United States | 5 | 19% |
Japan | 4 | 15% |
United Kingdom | 1 | 4% |
Australia | 1 | 4% |
Unknown | 15 | 58% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 19 | 73% |
Scientists | 6 | 23% |
Practitioners (doctors, other healthcare professionals) | 1 | 4% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 70 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Ph. D. Student | 13 | 19% |
Student > Bachelor | 12 | 17% |
Researcher | 11 | 16% |
Student > Master | 7 | 10% |
Student > Doctoral Student | 5 | 7% |
Other | 8 | 11% |
Unknown | 14 | 20% |
Readers by discipline | Count | As % |
---|---|---|
Earth and Planetary Sciences | 35 | 50% |
Agricultural and Biological Sciences | 6 | 9% |
Engineering | 2 | 3% |
Physics and Astronomy | 1 | 1% |
Environmental Science | 1 | 1% |
Other | 2 | 3% |
Unknown | 23 | 33% |