

FOLLOWUS
1. State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences
2. School of Marine Science China University of Geosciences
Online First:09 July 2010,
Published:2010
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Li, H., Zhang, S., Bai, L. et al. Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea., Chin. J. Ocean. Limnol. 28, 1350–1361 (2010). https://doi.org/10.1007/s00343-010-9079-1
Detailed mineral magnetic measurements
integrated with grain-size distribution and X-ray diffraction (XRD) analyses
were made on the marine sediments of Core MD98-2172
retrieved from the Eastern Timor Sea. Values of magnetic susceptibility in this core drop sharply down-core from ∼3.85 m deep below sediment/water interface and are very low at ∼5.35 m. However
both XRD and grain-size distribution results show no sudden change in terrigenous input during sedimentation. Mineral magnetic results indicate that the depth of ∼3.85 m may be an oxic/anoxic boundary. Therefore
the sediments below ∼3.85 m have been subjected to intense reductive diagenesis
whereas the sediments above ∼3.85 m are seldom affected. The magnetic properties of the sediments shallower than 3.85 m are dominated by pseudo-single domain (PSD) magnetite
with little down-core variation in its content and grain size. Below ∼3.85 m
the magnetic mineral assemblages that have survived in the sediments may record different stages of the reductive diagenesis: (1) the sediments from the 3.85–5.35 m interval are at the stage of iron oxide reduction; PSD magnetite is the major magnetic contributor
but it becomes less abundant and coarser down-core; (2) the sediments below ∼5.35 m are at the stage of sulphate reduction; ferrimagnetic minerals almost vanish and paramagnetic minerals contribute to down-core susceptibility variations
including pyrite as evidenced by high-temperature magnetic susceptibility measurements. However
the susceptibility variations below ∼5.35 m of Core MD98-2172 show obvious periodicity
despite the intense effect of reductive diagenesis. Furthermore
the down-core susceptibility variations are coincident with fluctuations in the quantity of fine detrital particles (<8 μm)
which may come mainly from the advection of the Indonesia Throughflow (ITF) and/or river input from Timor. Therefore
for Core MD98-2172
susceptibility variation below ∼5.35 m
which potentially correspond to fluctuations in the quantity of fine particles
may record the histories of the development of the ITF and precipitation on Timor.
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