Environmental conditions of interstadial (MIS 3) and features of the last glacial maximum on the King George island (West Antarctica)
The interstadial marine deposits stratum was described in the Fildes Peninsula (King George Island) due to field and laboratory investigations during 2008–2011. The stratum fragments occur in the west and north-west parts of peninsula in following forms: sections of soft sediments, containing fossil...
| Published in: | Ice and Snow |
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| Main Authors: | , , , , , , , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | Russian |
| Published: |
IGRAS
2015
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| Subjects: | |
| Online Access: | https://ice-snow.igras.ru/jour/article/view/90 https://doi.org/10.15356/2076-6734-2013-1-111-117 |
| Summary: | The interstadial marine deposits stratum was described in the Fildes Peninsula (King George Island) due to field and laboratory investigations during 2008–2011. The stratum fragments occur in the west and north-west parts of peninsula in following forms: sections of soft sediments, containing fossil shells, marine algae, bones of marine animals and rich marine diatom complexes in situ (11 sites); fragments of shells and bones on the surface (25 sites). According to the results of radiocarbon dating, these deposits were accumulated within the period 19–50 ky BP. Geographical and altitude settings of the sites, age characteristics, taxonomy of fossil flora and fauna, and good safety of the soft deposits stratum allow to make following conclusions: during interstadial, sea water covered significant part of King George Island up to the present altitude of 40 m a.s.l., and the King George Island glaciation had smaller size then; environmental conditions for the interstadial deposit stratum accumulation were at least not colder than today; probably, the King George island territory was covered entirely by ice masses of Last glacial maximum not earlier than 19 ky BP; during Last glacial maximum, King George Island was covered by thin, «cold», not mobile glaciers, which contribute to conservation of the soft marine interstadial deposits filled with fossil flora and fauna. В ходе экспедиционных и лабораторных работ 2008–2012 гг. изучены распространённые на п-ове Файлдс (о. Кинг Джордж) морские отложения интерстадиала. Разрезы отложений в ненарушенном залегании, содержащие морские комплексы диатомей, раковины, водоросли и кости морских животных, исследованы в 11 точках; высыпки раковин и костей на поверхности мысов, морен и склонов долин установлены в 25 точках. Согласно радиоуглеродному датированию, эти отложения накапливались в период между 19 и 50 тыс. л.н. Пространственное и высотное положение отложений, их строение, возраст, а также особенности видового состава ископаемой флоры и фауны позволяют заключить ... |
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