Nitrogen isotope evidence for a redox-stratified ocean and eustasy-driven environmental evolution during the Ordovician–Silurian transition

2021 ◽  
pp. 103682
Author(s):  
Shengchao Yang ◽  
Wenxuan Hu ◽  
Xiaolin Wang ◽  
Junxuan Fan
Keyword(s):  
Nitrogen Isotope ◽  
Environmental Evolution ◽  
Isotope Evidence ◽  
Stratified Ocean

Nitrogen isotope evidence for an oligotrophic shallow ocean during the Cambrian Stage 4

2019 ◽  
Vol 257 ◽  
pp. 49-67 ◽  
Author(s):  
Chao Chang ◽  
Wenxuan Hu ◽  
Xiaolin Wang ◽  
Kang-Jun Huang ◽  
Aihua Yang ◽  
...  
Keyword(s):  
Nitrogen Isotope ◽  
Stage 4 ◽  
Isotope Evidence

Nitrogen isotope evidence for expanded ocean suboxia in the early Cenozoic

Science ◽  
2019 ◽  
Vol 364 (6438) ◽  
pp. 386-389 ◽  
Author(s):  
Emma R. Kast ◽  
Daniel A. Stolper ◽  
Alexandra Auderset ◽  
John A. Higgins ◽  
Haojia Ren ◽  
...  
Keyword(s):  
Sediment Cores ◽  
Nitrogen Isotope ◽  
Tethys Sea ◽  
The North ◽  
Continental Shelves ◽  
Global Cooling ◽  
Isotope Evidence ◽  
Depth Water ◽  
The North Pacific ◽  
Early Cenozoic

The million-year variability of the marine nitrogen cycle is poorly understood. Before 57 million years (Ma) ago, the 15N/14N ratio (δ15N) of foraminifera shell-bound organic matter from three sediment cores was high, indicating expanded water column suboxia and denitrification. Between 57 and 50 Ma ago, δ15N declined by 13 to 16 per mil in the North Pacific and by 3 to 8 per mil in the Atlantic. The decline preceded global cooling and appears to have coincided with the early stages of the Asia-India collision. Warm, salty intermediate-depth water forming along the Tethys Sea margins may have caused the expanded suboxia, ending with the collision. From 50 to 35 Ma ago, δ15N was lower than modern values, suggesting widespread sedimentary denitrification on broad continental shelves. δ15N rose at 35 Ma ago, as ice sheets grew, sea level fell, and continental shelves narrowed.

scholarly journals VARIATION IN DIETARY HISTORIES AMONG THE IMMIGRANTS OF MACHU PICCHU: CARBON AND NITROGEN ISOTOPE EVIDENCE

2010 ◽  
Vol 42 (2) ◽  
pp. 515-534 ◽  
Author(s):  
Bethany L Turner ◽  
John D Kingston ◽  
George J Armelagos
Keyword(s):  
Nitrogen Isotope ◽  
Carbon And Nitrogen ◽  
Machu Picchu ◽  
Isotope Evidence

scholarly journals Nitrogen isotope evidence for manuring of early Neolithic Funnel Beaker Culture cereals from Stensborg, Sweden

2017 ◽  
Vol 14 ◽  
pp. 575-579 ◽  
Author(s):  
Kurt J. Gron ◽  
Darren R. Gröcke ◽  
Mikael Larsson ◽  
Lasse Sørensen ◽  
Lars Larsson ◽  
...  
Keyword(s):  
Nitrogen Isotope ◽  
Early Neolithic ◽  
Isotope Evidence ◽  
Funnel Beaker Culture
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