Results 1 to 10 of about 11,453 (209)
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 +9 more sources
The character of the Moho and lower crust within Archean cratons and the tectonic implications
Tectonophysics, 2013 Undisturbed mid Archean crust (stabilized by 3.0–2.9 Ga) has several characteristics that distinguish it from post Archean crust. Undisturbed mid-Archean crust has a low proportion of internal seismic boundaries (as evidenced by converted phases in ...
Dallas Abbott +2 more
exaly +3 more sources
Picrite evidence for more Fe in Archean mantle reservoirs
Earth and Planetary Science Letters, 1999 Recently discovered Archean amphibolites at the Lake of the Enemy, N.T., Canada, have alkaline ferropicrite compositions (MgO ~14 wt%) with fractionated REE profiles (La/Yb = 10-15), high Nb/La ratios (1-2), and an average ε(Nd) value of +1.1 at 2.66 Ga,
Don Francis +2 more
exaly +2 more sources
Geochemistry of Archean anorthosite-bearing layered intrusions
Earth-Science ReviewsThe geochemistry of Archean anorthosite-bearing layered intrusions has major implications for the thermal and chemical state of the Archean crust/mantle system, as originally posited by Bowen (1917) as “the anorthosite problem” and expanded on by Ashwal (
Paul Sotiriou +2 more
exaly +2 more sources
Evolution of the Archean Atmosphere
Archean atmospheric evolution is the transition from an abiological atmosphere, to an atmosphere for which the composition and therefore climate is highly altered by life.
Horne, Julia E. +2 more
core +2 more sources
Science Advances, 2020 What was the early atmosphere made of? We review what is known during the Archean eon, 4 to 2.5 billion years ago.
David C. Catling, Kevin J. Zahnle
openaire +2 more sources
The Archean Nickel Famine Revisited [PDF]
Astrobiology, 2015 Iron formations (IF) preserve a history of Precambrian oceanic elemental abundance that can be exploited to examine nutrient limitations on early biological productivity. However, in order for IF to be employed as paleomarine proxies, lumped-process distribution coefficients for the element of interest must be experimentally ...
Konhauser, Kurt +5 more
openaire +4 more sources
Lethaia, EarlyView., 2021 Biomineralization is a generic term used to indicate biological‐mediated mineral formation. In carbonate mineralization, nucleation of crystals can be: (1) controlled directly by the organisms, like in the skeletal formation of most metazoans; (2) induced by microbial communities, by indirect precipitation mediated by their metabolic activities; or (3)
Adriano Guido +4 more
wiley +1 more source
Archean-Paleozoic zircons in Zealandia
, 2022 Databases of U-Pb detrital zircon ages from Ordovician sandstones and quartzites in Nelson, Fiordland and Stewart Island, South Island New Zealand with have exceptionally high proportions of ages, 2000-3500 Ma, Archean-early Paleoproterozoic.
christopher adams (12236048) +1 more
core +1 more source
SQUID-SIMS is a useful approach to uncover primary signals in the Archean sulfur cycle [PDF]
, 2014 The Agouron Institute and National Aeronautic and Space Administration Exobiology Award NNX09AM91G supported this work.Many aspects of Earth's early sulfur cycle, from the origin of mass-anomalous fractionations to the degree of biological participation,
Guan, Yunbin +19 more
core +1 more source