Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea

Haiyan Li; Shihong Zhang; Lingyan Bai; Nianqiao Fang

doi:10.1007/s00343-010-9079-1

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Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea

OriginalPaper | Updated：2023-05-16

- Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea
- Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea
- 海洋湖沼学报（英文） 2010年28卷第6期页码：1350-1361
- Affiliations：
  
  1. State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences
  2. School of Marine Science China University of Geosciences
- Author bio：
- Funds：
  
  Supported by the National Basic Research Program of China (No. 2006CB701400), the National Natural Science Foundation of China (Nos. 40621002, 40974035, 40272074) and Projects of Ministry of Education of China (“111” Project B07011, IRT0546)
- DOI：10.1007/s00343-010-9079-1
  中图分类号：
- 网络首发：2010-07-09，
  
  纸质出版：2010
- Accepted：
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Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea[J]. 海洋湖沼学报（英文）, 2010,28(6):1350-1361.

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
Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea[J]. 海洋湖沼学报（英文）, 2010,28(6):1350-1361. DOI： 10.1007/s00343-010-9079-1.

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 DOI：

摘要

Abstract

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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