Zn isotope evidence for immediate resumption of primary productivity after snowball Earth

Geology ◽  
2013 ◽  
Vol 41 (1) ◽  
pp. 27-30 ◽  
Author(s):  
Marcus Kunzmann ◽  
Galen P. Halverson ◽  
Paolo A. Sossi ◽  
Timothy D. Raub ◽  
Justin L. Payne ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Snowball Earth ◽  
Isotope Evidence

Triple oxygen isotope evidence for limited mid-Proterozoic primary productivity

Nature ◽  
2018 ◽  
Vol 559 (7715) ◽  
pp. 613-616 ◽  
Author(s):  
Peter W. Crockford ◽  
Justin A. Hayles ◽  
Huiming Bao ◽  
Noah J. Planavsky ◽  
Andrey Bekker ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Primary Productivity ◽  
Isotope Evidence

NICKEL ISOTOPE EVIDENCE INDICATING ACTIVITY METHANOGENESIS DURING THE MELTING OF MARINOAN SNOWBALL EARTH

2017 ◽  
Author(s):  
Zhouqiao Zhao ◽  
◽  
Jianming Zhu ◽  
Xianguo Lang ◽  
Guangliang Wu ◽  
...  
Keyword(s):  
Snowball Earth ◽  
Nickel Isotope ◽  
Isotope Evidence

scholarly journals Multiple sulfur isotope evidence for massive oceanic sulfate depletion in the aftermath of Snowball Earth

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Pierre Sansjofre ◽  
Pierre Cartigny ◽  
Ricardo I. F. Trindade ◽  
Afonso C. R. Nogueira ◽  
Pierre Agrinier ◽  
...  
Keyword(s):  
Sulfur Isotope ◽  
Snowball Earth ◽  
Sulfate Depletion ◽  
Isotope Evidence

scholarly journals Uranium isotope evidence for temporary ocean oxygenation in the aftermath of the Sturtian Snowball Earth

2017 ◽  
Vol 458 ◽  
pp. 282-292 ◽  
Author(s):  
Kimberly V. Lau ◽  
Francis A. Macdonald ◽  
Kate Maher ◽  
Jonathan L. Payne
Keyword(s):  
Uranium Isotope ◽  
Snowball Earth ◽  
Isotope Evidence

scholarly journals Active methanogenesis during the melting of Marinoan snowball Earth

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Zhouqiao Zhao ◽  
Bing Shen ◽  
Jian-Ming Zhu ◽  
Xianguo Lang ◽  
Guangliang Wu ◽  
...  
Keyword(s):  
Global Warming ◽  
Rare Earth ◽  
Primary Productivity ◽  
Earth Element ◽  
Ice Age ◽  
Snowball Earth ◽  
Ice Melting ◽  
Geological Evidence ◽  
Positive Feedbacks ◽  
Marine Primary Productivity

AbstractGeological evidence indicates that the deglaciation of Marinoan snowball Earth ice age (~635 Myr ago) was associated with intense continental weathering, recovery of primary productivity, transient marine euxinia, and potentially extensive CH4 emission. It is proposed that the deglacial CH4 emissions may have provided positive feedbacks for ice melting and global warming. However, the origin of CH4 remains unclear. Here we report Ni isotopes (δ60Ni) and Yttrium-rare earth element (YREE) compositions of syndepositional pyrites from the upper most Nantuo Formation (equivalent deposits of the Marinoan glaciation), South China. The Nantuo pyrite displays anti-correlations between Ni concentration and δ60Ni, and between Ni concentration and Sm/Yb ratio, suggesting mixing between Ni in seawater and Ni from methanogens. Our study indicates active methanogenesis during the termination of Marinoan snowball Earth. This suggests that methanogenesis was fueled by methyl sulfides produced in sulfidic seawater during the deglacial recovery of marine primary productivity.

How Should Snowball Earth Deglaciation Start

2020 ◽  
Author(s):  
Jiacheng Wu ◽  
Yonggang Liu ◽  
Zhouqiao Zhao
Keyword(s):  
Snowball Earth

Limnological characteristics, community metabolism and management strategies of a coastal sinkhole in Cuba (Cenote Jennifer)

2020 ◽  
Vol 56 ◽  
pp. 24
Author(s):  
Roberto González-De Zayas ◽  
Liosban Lantigua Ponce de León ◽  
Liezel Guerra Rodríguez ◽  
Felipe Matos Pupo ◽  
Leslie Hernández-Fernández
Keyword(s):  
Hydrogen Sulfide ◽  
Primary Productivity ◽  
Major Ions ◽  
Saline Water ◽  
Management Strategies ◽  
Tourist Destination ◽  
Community Metabolism ◽  
Morphological Studies ◽  
Made In ◽  
Limnological Parameters

The Cenote Jennifer is an important and unique aquatic sinkhole in Cayo Coco (Jardines del Rey Tourist Destination) that has brackish to saline water. Two samplings were made in 1998 and 2009, and 4 metabolism community experiments in 2009. Some limnological parameters were measured in both samplings (temperature, salinity, pH, dissolved oxygen major ions, hydrogen sulfide, nutrients and others). Community metabolism was measured through incubated oxygen concentration in clear and dark oxygen bottles. Results showed that the sinkhole limnology depends on rainfall and light incidence year, with some stratification episodes, due to halocline or oxycline presence, rather than thermocline. The sinkhole water was oligotrophic (total nitrogen of 41.5 ± 22.2 μmol l−1 and total phosphorus of 0.3 ± 0.2 μmol l−1) and with low productivity (gross primary productivity of 63.0 mg C m−2 d−1). Anoxia and hypoxia were present at the bottom with higher levels of hydrogen sulfide, lower pH and restricted influence of the adjacent sea (2 km away). To protect the Cenote Jennifer, tourist exploitation should be avoided and more resources to ecological and morphological studies should be allocated, and eventually use this aquatic system only for specialized diving. For conservation purposes, illegal garbage disposal in the surrounding forest should end.

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