The evolution of Miocene surface and near-surface marine temperatures: Oxygen isotopic evidence

1985 ◽  
pp. 49-82 ◽  
Author(s):  
Samuel M. Savin ◽  
Linda Abel ◽  
Enriqueta Barrera ◽  
David Hodell ◽  
James P. Kennett ◽  
...  
Keyword(s):  
Near Surface ◽  
Isotopic Evidence ◽  
Oxygen Isotopic

Spectroscopic and oxygen isotopic evidence for low and high temperature origin of talc

1986 ◽  
Vol 109 (3) ◽  
pp. 253-263 ◽  
Author(s):  
Yves Noack ◽  
Alain Decarreau ◽  
Alain Manceau
Keyword(s):  
High Temperature ◽  
Isotopic Evidence ◽  
Oxygen Isotopic

Segregation and speciation in the Neogene planktonic foraminiferal clade Globoconella

Paleobiology ◽  
1999 ◽  
Vol 25 (3) ◽  
pp. 383-395 ◽  
Author(s):  
Cynthia E. Schneider ◽  
James P. Kennett
Keyword(s):  
Morphological Evolution ◽  
Evolutionary Divergence ◽  
Clinal Variation ◽  
Near Surface ◽  
Surface Warming ◽  
Isotopic Analyses ◽  
Oxygen Isotopic ◽  
Morphological Differences ◽  
Middle Pliocene ◽  
Water Depths

The origin of the Neogene planktonic foraminifer Globorotalia (Globoconella) pliozea in the subtropical southwest Pacific has been attributed to its isolation resulting from intensification of the Subtropical Divergence (Tasman Front). Oxygen isotopic analyses suggest that, although the Subtropical Divergence may have played a role, the evolution of Gr. (G.) pliozea was facilitated by depth segregation of Gr. (G.) conomiozea morphotypes (low and high conical) during an interval of near-surface warming and increasing thermal gradient. Oxygen isotopic analyses suggest that low conical morphotypes of Gr. (G.) conomiozea inhabited greater depths than high conical morphotypes. Low conical forms of Gr. (G.) conomiozea are considered ancestral to the low conical species, Gr. (G.) pliozea. Oxygen isotopes indicate that Gr. (G.) pliozea inhabited greater depths than its ancestor, Gr. (G.) conomiozea.These data are consistent with depth-parapatric and depth-allopatric models, but not with a sympatric model of speciation. In the allopatric model, reproduction at different water depths acts as a barrier between morphotypes. In the parapatric model, clinal variation along a depth gradient acts as a barrier between morphotypes living at the limits of the gradient. Depth segregation in both models results in genetic isolation and evolutionary divergence. Our data support a correlation between morphological evolution and habitat changes in the Globoconella clade, implying separation of populations as a driving force for morphological evolution.Ecological segregation of morphotypes and species may be related to morphology (height of the conical angle), based on the data from Gr. (G.) conomiozea and Gr. (G.) pliozea. However, morphological differences alone do not necessarily produce depth differences. Large morphological differences between Gr. (G.) pliozea and closely related Gr. (G.) puncticulata did not result in isotopic and therefore depth differences between these species. These species coexisted at the same water depths for nearly 1 m.y. Thus, it is unlikely that the extinction of Gr. (G.) pliozea in the middle Pliocene resulted from competition with Gr. (G.) puncticulata, as previously suggested.

scholarly journals ASTRONOMICAL OXYGEN ISOTOPIC EVIDENCE FOR SUPERNOVA ENRICHMENT OF THE SOLAR SYSTEM BIRTH ENVIRONMENT BY PROPAGATING STAR FORMATION

2011 ◽  
Vol 729 (1) ◽  
pp. 43 ◽  
Author(s):  
Edward D. Young ◽  
Matthieu Gounelle ◽  
Rachel L. Smith ◽  
Mark R. Morris ◽  
Klaus M. Pontoppidan
Keyword(s):  
Star Formation ◽  
Solar System ◽  
Isotopic Evidence ◽  
Oxygen Isotopic ◽  
Birth Environment

scholarly journals Oxygen isotopic evidence for accretion of Earth’s water before a high-energy Moon-forming giant impact

2018 ◽  
Vol 4 (3) ◽  
pp. eaao5928 ◽  
Author(s):  
Richard C. Greenwood ◽  
Jean-Alix Barrat ◽  
Martin F. Miller ◽  
Mahesh Anand ◽  
Nicolas Dauphas ◽  
...  
Keyword(s):  
High Energy ◽  
Giant Impact ◽  
Isotopic Evidence ◽  
Oxygen Isotopic

Sulfur and oxygen isotopic evidence of country rock contamination in the Voisey's Bay Ni–Cu–Co deposit, Labrador, Canada

Lithos ◽  
1999 ◽  
Vol 47 (1-2) ◽  
pp. 53-68 ◽  
Author(s):  
Edward M. Ripley ◽  
Young-Rok Park ◽  
Chusi Li ◽  
Anthony J. Naldrett
Keyword(s):  
Country Rock ◽  
Isotopic Evidence ◽  
Oxygen Isotopic
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