Paleocene-Eocene warming and biotic response in the epicontinental west Siberian Sea
Paleocene-Eocene warming and biotic response in the epicontinental west Siberian Sea
Geology (Boulder) (September 2014) 42 (9): 767-770
- Asia
- biostratigraphy
- boreholes
- C-13/C-12
- carbon
- Cenozoic
- chemostratigraphy
- clastic rocks
- climate change
- Commonwealth of Independent States
- cores
- Dinoflagellata
- global change
- global warming
- isotope ratios
- isotopes
- lithostratigraphy
- magnetostratigraphy
- microfossils
- paleo-oceanography
- Paleocene-Eocene Thermal Maximum
- paleoenvironment
- Paleogene
- paleotemperature
- palynomorphs
- reconstruction
- Russian Federation
- sandstone
- sedimentary rocks
- Siberia
- stable isotopes
- Tertiary
- southwestern Siberia
- TEX-86
We present a Paleocene-Eocene (ca. 60-52 Ma) sea-surface temperature record from sediments deposited in the epicontinental West Siberian Sea. TEX (sub 86) paleothermometry indicates long-term late Paleocene ( approximately 17 degrees C ca. 59 Ma) to early Eocene (26 degrees C at 52 Ma) sea-surface warming, consistent with trends previously observed for the Southern Ocean and deep oceans. Photic zone and seafloor anoxia developed as temperatures rose by 7 degrees C to approximately 27 degrees C during the Paleocene-Eocene Thermal Maximum (PETM). Based on paired palynological and TEX (sub 86) data, we suggest that the minimum temperature for the proliferation of Paleocene and early Eocene members of the dinoflagellate family Wetzelielloideae, which includes the PETM marker taxon Apectodinium, was approximately 20 degrees C.
