Publication Date:
2017-04-04
Description:
An exceptional triple palynological signal (unusually high abundance of marine, freshwater,
and terrestrial palynomorphs) recovered from a core collected during the 2007 ANDRILL
(Antarctic geologic drilling program) campaign in the Ross Sea, Antarctica, provides constraints
for the Middle Miocene Climatic Optimum. Compared to elsewhere in the core, this
signal comprises a 2000-fold increase in two species of dinoflagellate cysts, a synchronous fivefold
increase in freshwater algae, and up to an 80-fold increase in terrestrial pollen, including
a proliferation of woody plants. Together, these shifts in the palynological assemblages
ca. 15.7 Ma ago represent a relatively short period of time during which Antarctica became
abruptly much warmer. Land temperatures reached 10 °C (January mean), estimated annual
sea-surface temperatures ranged from 0 to 11.5 °C, and increased freshwater input lowered
the salinity during a short period of sea-ice reduction.
Description:
Published
Description:
955-958
Description:
1.8. Osservazioni di geofisica ambientale
Description:
2.2. Laboratorio di paleomagnetismo
Description:
JCR Journal
Description:
reserved
Keywords:
Middle Miocene Climatic Optimum
;
ANDRILL
;
Antarctica
;
Palynomorphs
;
04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transport
;
04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
