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Mineral magnetic record of environment in Late Pleistocene and Holocene sediments, Lake Manas, Xinjiang, China
Author(s) -
Jelinowska A.,
Tucholka P.,
Gasse F.,
Fontes J. C.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl00708
Subject(s) - authigenic , geology , holocene , greigite , sedimentary rock , pleistocene , geochemistry , sediment , paleontology , pyrite
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 analysed for bulk sediment mineralogy, stables isotopes from carbonates and biogenic material. Magnetic minerals confirm major changes in palaeoenvironmental and palaeohydrological 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, Fe 3 S 4 during the lacustrine episodes dated from ∼8.7 kyr B.P. to ∼5.5 kyr B.P. (380–335 cm) and from ∼4.5 kyr B.P. to ∼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.