G. Zhang et al., Molecular organic geochemical peculiarities of lacustrine core sediments in Fildes Peninsula, King George Island, Antarctica, CHIN SCI B, 45, 2000, pp. 67-70
The peculiarities of lipids in lacustrine core sediments from Fildes Penins
ula, King George Island, Antarctica, are reported. The origin of high-molec
ular-weight n-alkanes, alkenes, fatty acids, alcohols is supposed to be rel
ated to the abundant moss occurring in the sediments. Abundant iso- and ant
eiso-fatty acids that occur in the sediments indicate a relatively strong b
acterial activity in non-ice-cover zone than in other regions in Antarctica
. The C-18:2 unsaturated fatty acids mainly originate from autochthonous al
gae in the sediment pool, and the C-18:2/C-18:0 ratios in the profile are c
ontrolled more by paleotemperatures than source assemblies. Long-chain alke
nones were identified in freshwater lacustrine sediment in Antarctica for t
he first time, of which Prymnesiophyceae is assumed to be the source organi
sm. High relative abundance of C-37:4 homologue in long-chain alkenone well
correlates to the severely cold climate in Antarctica.