Cretaceous warming and environmental changes linked to volcanism

Takashima Reishi, Hiroshi Nishi
The mid-Cretaceous period is one of the warmest climate periods in the history of Earth. Although the long-term (>1 my) warming trend during mid-Cretaceous is considered to have caused by activated volcanism in mid-Ocean ridges, increased volcanic activities in subduction zones also may have contributed to global warming during 100-80 Ma. On the other hand, emplacements of Large Igneous Provinces (LIPs) during mid-Cretaceous induced transient rapid warming (<1 my) through outgassing of volcanic
more » ... CO 2 . Such rapid warming may have resulted in elevation of primary productivity and expansion of anoxia in the global oceans (Oceanic Anoxic Events: OAEs) through the enhancement of weathering and continental run-off. Recent 187 Os/ 188 Os isotope stratigraphies and U-Pb ages in the Oceanic Anoxic Event 2 (OAE2) interval revealed that the activity of LIPs preceded the OAE2 by 300 kilo years.
doi:10.14825/kaseki.101.0_69 fatcat:7774sp5x3jcyjgbrk3jvmjkkam