Mineral magnetic record of environment in Late Pleistocene and Halocene sediments, Lake Manas, Xinjiang, China

Details Mineral magnetic record of environment in Late Pleistocene and Halocene sediments, Lake Manas, Xinjiang, China Mineral magnetic record of environment in Late Pleistocene and Halocene sediments, Lake Manas, Xinjiang, China

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..953j&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 8, p. 953-956

Mathematics

Logic

9

Chronology, Climate Change, Ferrimagnetism, Magnetic Properties, Mineralogy, Paleoclimatology, Paleomagnetism, Sediments, China, Lithology

Scientific paper

A study of magnetic parameters was carried out on a Late Pleistocene and Holocene sedimentary sequence (5 m) from Lake Manas (northern Xinjiang, China), that has already been analyzed for bulk sediment mineralogy, stables isotopes from carbonates and biogenic material. Magnetic minerals confirm major changes in paleoenvironmental and paleohydrological conditions that were deduced from other methods. They also provide complementary information on changes in the lake system during the early and middle Holocene. The most important mineral magnetic change results from the authigenic formation of ferrimagnetic greigite, Fe3S4 during the lacustrine episodes dated from approximately 8.7 kyr B.P. to approximately 5.5 kyr B.P. (380-335 cm) and from approximately 4.5 kyr B.P. to approximately 3.5 kyr B.P. (320-285 cm) respectively. Our data also indicate an abrupt break in sedimentary conditions which coincides with a short-term return towards dry climatic conditions around 3.5 kyr B.P., which was only suggested from other proxy data.

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