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X Demographics
Mendeley readers
Attention Score in Context
| Title |
Calcium isotope constraints on the end-Permian mass extinction
|
|---|---|
| Published in |
Proceedings of the National Academy of Sciences of the United States of America, April 2010
|
| DOI | 10.1073/pnas.0914065107 |
| Pubmed ID | |
| Authors |
Jonathan L. Payne, Alexandra V. Turchyn, Adina Paytan, Donald J. DePaolo, Daniel J. Lehrmann, Meiyi Yu, Jiayong Wei |
| Abstract |
The end-Permian mass extinction horizon is marked by an abrupt shift in style of carbonate sedimentation and a negative excursion in the carbon isotope (delta(13)C) composition of carbonate minerals. Several extinction scenarios consistent with these observations have been put forward. Secular variation in the calcium isotope (delta(44/40)Ca) composition of marine sediments provides a tool for distinguishing among these possibilities and thereby constraining the causes of mass extinction. Here we report delta(44/40)Ca across the Permian-Triassic boundary from marine limestone in south China. The delta(44/40)Ca exhibits a transient negative excursion of approximately 0.3 per thousand over a few hundred thousand years or less, which we interpret to reflect a change in the global delta(44/40)Ca composition of seawater. CO(2)-driven ocean acidification best explains the coincidence of the delta(44/40)Ca excursion with negative excursions in the delta(13)C of carbonates and organic matter and the preferential extinction of heavily calcified marine animals. Calcium isotope constraints on carbon cycle calculations suggest that the average delta(13)C of CO(2) released was heavier than -28 per thousand and more likely near -15 per thousand; these values indicate a source containing substantial amounts of mantle- or carbonate-derived carbon. Collectively, the results point toward Siberian Trap volcanism as the trigger of mass extinction. |
X Demographics
The data shown below were collected from the profiles of 3 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United Kingdom | 1 | 33% |
| Germany | 1 | 33% |
| Unknown | 1 | 33% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 3 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 246 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 6 | 2% |
| Germany | 5 | 2% |
| United Kingdom | 2 | <1% |
| Netherlands | 1 | <1% |
| Chile | 1 | <1% |
| Canada | 1 | <1% |
| Switzerland | 1 | <1% |
| Spain | 1 | <1% |
| Argentina | 1 | <1% |
| Other | 0 | 0% |
| Unknown | 227 | 92% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 57 | 23% |
| Researcher | 53 | 22% |
| Student > Master | 21 | 9% |
| Professor | 19 | 8% |
| Student > Bachelor | 18 | 7% |
| Other | 46 | 19% |
| Unknown | 32 | 13% |
| Readers by discipline | Count | As % |
|---|---|---|
| Earth and Planetary Sciences | 150 | 61% |
| Agricultural and Biological Sciences | 16 | 7% |
| Environmental Science | 13 | 5% |
| Biochemistry, Genetics and Molecular Biology | 4 | 2% |
| Chemistry | 4 | 2% |
| Other | 12 | 5% |
| Unknown | 47 | 19% |
Attention Score in Context
This research output has an Altmetric Attention Score of 47. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 07 January 2024.
All research outputs
#861,791
of 25,054,308 outputs
Outputs from Proceedings of the National Academy of Sciences of the United States of America
#13,787
of 102,280 outputs
Outputs of similar age
#2,450
of 101,921 outputs
Outputs of similar age from Proceedings of the National Academy of Sciences of the United States of America
#57
of 731 outputs
Altmetric has tracked 25,054,308 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 96th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 102,280 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 39.0. This one has done well, scoring higher than 86% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 101,921 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 97% of its contemporaries.
We're also able to compare this research output to 731 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 92% of its contemporaries.