Preliminary study on the magnetic susceptibility of sediments in cave c6-1 of dak nong Unesco global geopark
The magnetic susceptibility (MS)of cave sediments has become a proxy for the paleoclimate. The magnetic propertiesof the sediments formed outside thecave are influenced by the weather. The sediments are later brought into the cave by various means and deposited. Thus, the MS in the strati...
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| Những tác giả chính: | , , , , , , , , , |
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| Định dạng: | Journal article |
| Ngôn ngữ: | English |
| Được phát hành: |
Lâm Đồng
2023
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| Những chủ đề: | |
| Truy cập trực tuyến: | https://scholar.dlu.edu.vn/handle/123456789/1847 http://dx.doi.org/10.37569/DalatUniversity.11.3.867(2021) |
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| Thư viện lưu trữ: | Thư viện Trường Đại học Đà Lạt |
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| Tóm tắt: | The magnetic susceptibility (MS)of cave sediments has become a proxy for the paleoclimate. The magnetic propertiesof the sediments formed outside thecave are influenced by the weather. The sediments are later brought into the cave by various means and deposited. Thus, the MS in the stratigraphic column of cave sediments carries information about the weather when the sediments formed. The stratigraphiccolumn at cave C6-1 has been investigated in several archaeological studies. In this study, 185 soil samples were collected to a depth of 184cm at a sampling interval of about 1cm. MS measurements were carried out by the Department of Geomagnetism at the Institute of Geophysics of the Vietnam Academy of Science and Technology. The MS results can be divided into eight magnetic zones, C6.1-1 to C6.1-8, of which C6.1-1, C6.1-3, C6.1-5, and C6.1-7 correspond to cold dry weather, and C6.1-2, C6.1-4, C6.1-6, and C6.1-8 correspond to warmer weather. Multi-Taper Method (MTM)analysis of the MS data shows three significant cycle ranges with MTMconfidence levels above 95%. Using the carbon-14 radiocarbon datingmethod, we determined ages for three weather cycles of 562, 375, and 281 years. From 6,768 to 6,954 years BP, there was a sudden accumulationrateof sediment in the section that was 5 to 30 times higher than in other periods. |
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