Results 11 to 20 of about 829 (171)
Photosynthetic primary production in the Mesoproterozoic
New PhytologistSummary The Mesoproterozoic atmosphere had more CO 2 and less O 2 than at present. While the upper ocean was oxygenated, the deeper ocean was euxinic or ferruginous.
Patricia Sánchez‐Baracaldo +1 more
openaire +2 more sources
Geophysical Monograph Series, Page 1-26., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst +8 more
wiley +4 more sources
A Mesoproterozoic iron formation [PDF]
Proceedings of the National Academy of Sciences, 2018 Significance Iron formations (IFs) are common before 1,800 million years ago (Ma) and again at ∼750 Ma, but are remarkably absent for the billion years in between. We report on a 1,400-Ma IF of ∼520 gigatons Fe from the Xiamaling Formation on the North China Craton. Biomarker analyses suggest that anoxygenic phototrophic bacteria were
Donald E. Canfield +8 more
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Active Microbial Sulfur Disproportionation in the Mesoproterozoic [PDF]
Science, 2005 The environmental expression of sulfur compound disproportionation has been placed between 640 and 1050 million years ago (Ma) and linked to increases in atmospheric oxygen. These arguments have their basis in temporal changes in the magnitude of 34 S/ 32 S fractionations between sulfate and ...
Johnston, David Thomas +7 more
openaire +3 more sources
Dizhi lixue xuebao, 2022 Due to the complicated tectonic and sedimentary history and the lack of effective paleo-thermal indicators, the Meso-Neoproterozoic thermal history of the Yanliao rift zone in the northern margin of the North China Craton is ambiguous, which causes the ...
LI Chenxing +4 more
doaj +1 more source
Energy Exploration & Exploitation, 2020 Oil reservoirs have been discovered in the Mesoproterozoic strata in the Liaoxi Depression, NE China. In order to determine the source of oil shows of the Mesoproterozoic Gaoyuzhuang Formation and their organic geochemical characteristics, eight source ...
Youjun Tang +9 more
doaj +1 more source
Dizhi lixue xuebao, 2021 We report new geochronological data of the mafic gneiss and leucogneiss from the Windmill Islands, East Antarctica, in order to unravel the tectonothermal events related to the amalgamation of Rodinia. SHRIMP zircon U-Pb dating from the mafic gneiss (Hbl-
WANG Yanbin +5 more
doaj +1 more source
The aerobic diagenesis of Mesoproterozoic organic matter [PDF]
Scientific Reports, 2018 AbstractThe Xiamaling Formation in the North China Block contains a well-preserved 1400 Ma sedimentary sequence with a low degree of thermal maturity. Previous studies have confirmed the dynamic and complex nature of this evolving marine setting, including the existence of an oxygen-minimum zone, using multi-proxy approaches, including iron speciation,
Wang, Xiaomei +6 more
openaire +2 more sources
Mesoproterozoic Anorthosite Bloom
, 2022 Accompanying data and scripts for "Earth's anomalous middle-age magmatism driven by plate slowdownEarth's anomalous middle-age magmatism driven by plate slowdown", in submission, 2021.
O'Neill, Craig, Brown, Schaefer, Gazi
openaire +1 more source
Terrestrial microbialites provide constraints on the mesoproterozoic atmosphere
The Depositional Record, 2020 Palaeoclimate data indicate that Earth surface temperatures have remained largely temperate for the past 3.5 Byr despite significantly lower solar luminosity over this time relative to the present day.
Michael T. Hren, Nathan D. Sheldon
doaj +1 more source