Hydrothermal activity in a peculiar oceanic ridge: Oxygen and hydrogen isotope evidence in the Xigaze ophiolite (Tibet, China)

1988 ◽  
Vol 71 (4) ◽  
pp. 313-335 ◽  
Author(s):  
Pierre Agrinier ◽  
Marc Javoy ◽  
Jacques Girardeau
Keyword(s):  
Hydrogen Isotope ◽  
Hydrothermal Activity ◽  
Oceanic Ridge ◽  
Isotope Evidence

scholarly journals Hydrogen isotope evidence for loss of water from Mars through time

2008 ◽  
Vol 35 (5) ◽  
Author(s):  
James P. Greenwood ◽  
Shoichi Itoh ◽  
Naoya Sakamoto ◽  
Edward P. Vicenzi ◽  
Hisayoshi Yurimoto
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Evidence

scholarly journals Mid-Cretaceous marine Os isotope evidence for heterogeneous cause of oceanic anoxic events

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Hironao Matsumoto ◽  
Rodolfo Coccioni ◽  
Fabrizio Frontalini ◽  
Kotaro Shirai ◽  
Luigi Jovane ◽  
...  
Keyword(s):  
Isotopic Ratio ◽  
Hydrothermal Activity ◽  
Warm Climate ◽  
Time Intervals ◽  
Environmental Perturbations ◽  
Igneous Provinces ◽  
Anoxic Events ◽  
Isotope Evidence ◽  
Short Time ◽  
Os Isotope

AbstractDuring the mid-Cretaceous, the Earth experienced several environmental perturbations, including an extremely warm climate and Oceanic Anoxic Events (OAEs). Submarine volcanic episodes associated with formation of large igneous provinces (LIPs) may have triggered these perturbations. The osmium isotopic ratio (187Os/188Os) is a suitable proxy for tracing hydrothermal activity associated with the LIPs formation, but 187Os/188Os data from the mid-Cretaceous are limited to short time intervals. Here we provide a continuous high-resolution marine 187Os/188Os record covering all mid-Cretaceous OAEs. Several OAEs (OAE1a, Wezel and Fallot events, and OAE2) correspond to unradiogenic 187Os/188Os shifts, suggesting that they were triggered by massive submarine volcanic episodes. However, minor OAEs (OAE1c and OAE1d), which do not show pronounced unradiogenic 187Os/188Os shifts, were likely caused by enhanced monsoonal activity. Because the subaerial LIPs volcanic episodes and Circum-Pacific volcanism correspond to the highest temperature and pCO2 during the mid-Cretaceous, they may have caused the hot mid-Cretaceous climate.

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