Ostracods in permafrost deposits from the Bykovsky Peninsula 1998/1999

• Main Authors: Wetterich, Sebastian, Schirrmeister, Lutz, Pietrzeniuk, Erika
• Format: Dataset
• Language: English
• Published: PANGAEA 2005
• Subjects: Age; 14C conventional; dated; error to older; error to younger; AWI_PerDyn; AWI Arctic Land Expedition; Byk_98_Mkh-1.6.1; Byk_98_Mkh-6.2; Byk_99_Mkh; Bykovsky Peninsula; Lena Delta; Siberia; Candona cf. acutula; Candona combibo; Candona harmsworthi; Candona muelleri-jacutica; Candona rawsoni; Candona sp.; juvenile; Chain saw; Counting; ostracode valves and carapaces; CSAW; Date/Time of event; Deposit type; Eucypris dulcifons; Event label; Fabaeformiscandona cf. hyalina; Fabaeformiscandona levanderi; HAND; Hand ice drill; Height above sea level; HID; Ilyocypris sp.; Latitude of event; Russia; Lena-Delta1998; Lena-Delta1999; Lena-Delta2000; Limnocythere falcata; Limnocythere goersbachensis; Limnocytherina sanctipatricii; Arctic; Laptev Sea; Ice; laptev; lena delta; permafrost; Thermokarst; wedge*
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.879596; https://doi.org/10.1594/PANGAEA.879596

Ostracode analysis was carried out on samples from ice-rich permafrost deposits obtained on the Bykovsky Peninsula (Laptev Sea). A composite profile was investigated that covers most of a 38-m thick permafrost sequence and corresponds to the last ca. 60 kyr of the Late Quaternary. The ostracode assemblages are similar to those known from European Quaternary lake deposits during cold stages. The ostracode habitats were small, shallow, cold, oligotrophic pools located in low centred ice wedge polygons or in small thermokarst depressions. In total, 15 taxa, representing 7 genera, were identified from 65 samples. The studied section is subdivided into six ostracode zones that correspond to Late Quaternary climatic and environmental stadial-interstadial variations established by other paleoenvironmental proxies: (1) cold and dry Zyrianian stadial (58-53 kyr BP); (2) warm and dry Karginian interstadial (48-34 kyr BP); (3) transition from the Karginian interstadial to the cold and dry Sartanian stadial (34-21 kyr BP); (4) transition from the Sartanian stadial to the warm and dry Late Pleistocene period, the Allerød (21-14 kyr BP); (5) transition from the Allerød to the warm and wet Middle Holocene (14-7 kyr BP); and (6) cool and wet Late Holocene (ca. 3 kyr BP). The abundance and diversity of the ostracodes will be used as an additional bioindicator for paleoenvironmental reconstructions of the Siberian Arctic.