| LV Huahua,SHI Xuefa,WU Yonghua,YANG Gang,WEI Jianwei,REN Xiangwen. 2007. A preliminary study on thermoluminescence characteristics of sediments from the North Pacific. Acta Oceanologica Sinica, (3):56－72 |
| A preliminary study on thermoluminescence characteristics of sediments from the North Pacific |
| A preliminary study on thermoluminescence characteristics of sediments from the North Pacific |
| Received:March 31, 2006 Revised:April 11, 2007 |
| DOI： |
| Key words:North Pacific surface sediments thermoluminescence sedimentary environment clay minerals |
| 中文关键词: North Pacific surface sediments thermoluminescence sedimentary environment clay minerals |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LV Huahua | Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 260061, China
Graduate School, Chinese Academy of Sciences, Beijing 100049, China | lhhyg@fio.org.cn | | SHI Xuefa | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 260061, China | | | WU Yonghua | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 260061, China | | | YANG Gang | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 260061, China | | | WEI Jianwei | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 260061, China | | | REN Xiangwen | Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 260061, China | |
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| Abstract: |
| Thirty-eight surficial deposit samples were collected from the equatorial North Pacific,and the natural thermoluminescence (TL) characteristics of both bulk and clay fraction samples (<2 μm fractions) were studied by the FJ427-A1 automatic TL Dosimeter for the first time.With the measurements of clay mineral composition,element composition by XRD and ICP,the correlations between TL intensity and sedimentary environment proxies were analyzed,such as water depth,ratio of FeO to Fe2O3 contents,LOI,and major clay mineral concentration,and it was found the bulk sample's TL signal was stronger than the clay ones.Usually,increase in the clay components may result in the decrease of TL intensity.From the shape of TL curves,the pelagic sediments can be divided into two groups:the majority group has two glow peaks,in general,the first peak is broad and flat,but the second narrow and sharp; the minority group only has a single peak because the first is absent.The peak centers of TL curves are almost fixed,falling in the temperature sections 230~260 and 390~405℃ respectively.Lorentz model packed in the Origin 7.5 was chosen to deal with the TL curves.From the processing results,three parameters (H,C and A),corresponding to the height,center,and kurtosis of TL curve,were obtained to describe the curve characteristics.The correlations between TL curve parameters and sedimentary environment proxies were also calculated.On the basis of the above work,the relationship between TL characteristics and sediment type,mineral composition,sedimentary environment of surface sediments was discussed in the study area,and a conclusion is:sediments from the environment of shallower water,higher organic contents and weaker reductivity have stronger TL signals. |
| 中文摘要: |
| Thirty-eight surficial deposit samples were collected from the equatorial North Pacific,and the natural thermoluminescence (TL) characteristics of both bulk and clay fraction samples (<2 μm fractions) were studied by the FJ427-A1 automatic TL Dosimeter for the first time.With the measurements of clay mineral composition,element composition by XRD and ICP,the correlations between TL intensity and sedimentary environment proxies were analyzed,such as water depth,ratio of FeO to Fe2O3 contents,LOI,and major clay mineral concentration,and it was found the bulk sample's TL signal was stronger than the clay ones.Usually,increase in the clay components may result in the decrease of TL intensity.From the shape of TL curves,the pelagic sediments can be divided into two groups:the majority group has two glow peaks,in general,the first peak is broad and flat,but the second narrow and sharp; the minority group only has a single peak because the first is absent.The peak centers of TL curves are almost fixed,falling in the temperature sections 230~260 and 390~405℃ respectively.Lorentz model packed in the Origin 7.5 was chosen to deal with the TL curves.From the processing results,three parameters (H,C and A),corresponding to the height,center,and kurtosis of TL curve,were obtained to describe the curve characteristics.The correlations between TL curve parameters and sedimentary environment proxies were also calculated.On the basis of the above work,the relationship between TL characteristics and sediment type,mineral composition,sedimentary environment of surface sediments was discussed in the study area,and a conclusion is:sediments from the environment of shallower water,higher organic contents and weaker reductivity have stronger TL signals. |
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