globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.12.008
论文题名:
Variation of magnetic properties in sediments from Lake Towuti, Indonesia, and its paleoclimatic significance
作者: Tamuntuan G.; Bijaksana S.; King J.; Russell J.; Fauzi U.; Maryunani K.; Aufa N.; Safiuddin L.O.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 420
起始页码: 163
结束页码: 172
语种: 英语
英文关键词: Dissolution ; Indonesia ; Lake Towuti ; Magnetic minerals ; Paleoclimate
英文摘要: We investigated the mineral-magnetic behavior of sediments from Lake Towuti located in the Eastern Sulawesi Ophiolite belt, Indonesia. Rock magnetic analysis supplemented by X-ray diffraction and scanning electron microscopy analysis were performed on sediment core TOW10-9B from the north basin of Lake Towuti to give insights on the environmental and sedimentary processes controlling the magnetic properties of the sediment and its paleoclimatic significance. The results show that the core has three distinct zones of varying magnetic properties. Careful examination demonstrates that these zones correspond to varying levels of iron oxide dissolution and magnetite precipitation that are climatically and environmentally dependent. The magnetically strongest zone is characterized by weak iron oxide dissolution and intense magnetite precipitation, likely driven by changes in the stratification and/or water level of the lake during dry conditions in Marine Isotope Stage 2 (MIS2) period, whereas the two magnetically weaker zones are characterized by signs of dissolution and correspond to relatively wet conditions, respectively, during Marine Isotope Stage 3 (MIS3) and the Holocene. Although our data show that major changes in concentration dependent parameters, such as magnetic susceptibility and saturation isothermal remanent magnetization (SIRM), in Lake Towuti sediment correlate with changes in regional rainfall, many of the concentration changes are more strongly affected by in situ chemical processes than by changes in erosion and terrestrial sediment supply. These findings urge caution in the interpretation of magnetic mineral concentration profiles as indicators of clastic sediment inputs. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69030
Appears in Collections:过去全球变化的重建

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作者单位: Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung, Indonesia; Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung, Indonesia; Graduate School of Oceanography, University of RI, Narragansett, United States; Department of Geological Sciences, Brown University, Providence, United States; Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung, Indonesia; Faculty of Teaching and Educational Sciences, Haluoleo University, Kendari, Indonesia

Recommended Citation:
Tamuntuan G.,Bijaksana S.,King J.,et al. Variation of magnetic properties in sediments from Lake Towuti, Indonesia, and its paleoclimatic significance[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,420
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