Magnetostratigraphy of Quaternary sediments from borehole SYS90-1A in the South Yellow Sea
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摘要:
可靠的年代地层框架是开展南黄海地区第四纪环境演变研究的基础。目前南黄海南部地区缺乏可靠年代学控制的长序列钻孔。通过对南黄海南部SYS90-1A孔( 孔深 90.1 m) 沉积物开展详细的磁性地层学研究，并结合AMS14C测年结果及区域已有磁性地层学结果，建立南黄海南部地区第四纪沉积物年代地层框架。结果显示，SYS90-1A孔岩芯记录了从布容(Brunhes) 正极性时至松山(Matuyama) 负极性时上部，包括Kamikatsura和Santa Rosa地磁漂移事件。早、中更新世界线即布容正极性时与松山负极性时界线（B/M界线）深度位于74.2 m，Kamikatsura和Santa Rosa地磁漂移事件深度分别位于79.75～82.47 m和85.25～87.74 m。根据Kamikatsura和Santa Rosa地磁漂移事件的年代控制点和平均沉积速率，推算钻孔底部年龄为0.96 Ma。南黄海SYS90-1A孔早更新世晚期的沉积速率约为8.66 cm/ka，中更新世以来的沉积速率约为9.5 cm/ka，而全新世以来的沉积速率为12.8 cm/ka，沉积速率自早更新世晚期以来呈增加趋势。这一结果不仅为南黄海南部第四纪沉积物研究提供了有效的年代学约束，而且为南黄海地区第四纪地层划分和对比、沉积环境与气候变化、物源示踪等研究提供了重要的时间标尺。
Abstract:Quaternary sediments in the southern South Yellow Sea provide important geological archives for addressing Quaternary sea-level changes and environmental evolution. However, long sedimentary sequences with a reliable chrono-logical framework in this area are scarce. A detailed paleomagnetism study on sediments from borehole SYS90-1A (90.1 m) that located in the southern South Yellow Sea was carried out in combination with AMS14C dating data and published studies regarded. Eleven normal inclination zones and 11 negative inclination zones in the borehole SYS90-1A were revealed from the characteristic remanent magnetization after alternating-field demagnetization. The Matuyama/Brunhes boundary was found at the core depth of ～74.2 m. Meanwhile, the Kamikatsura excursion and Santa Rosa excursion were recognized at depth of 79.75～82.47m and 85.25～87.74m, respectively. The basal age of the core was estimated for about 0.96 Ma by the extrapolation of average sedimentation rate between the Kamikatsura excursion and Santa Rosa excursion. The average sedimentation rate of borehole SYS90-1A is 8.66 cm/ka in the late Early Pleistocene, 9.5 cm/ka since the Middle Pleistocene, and 12.8 cm/ka since the start of the Holocene. The sedimentation rate of the core showed an increasing trend since the late Early Pleistocene. This study provided a reliable geochronological framework of the borehole, which facilitated the stratigraphic division and tectonic evolution of the Quaternary System in the southern South Yellow Sea and its neighboring regions.
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Key words:
- paleomagnetism /
- sedimentation rate /
- Quaternary /
- central mud area /
- South Yellow Sea
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表 1 南黄海SYS90-1A孔AMS14C测年结果
Table 1. The AMS14C dating results for the SYS90-1A core in the southern Yellow Sea
深度/m 测试材料 δ13C /‰ 常规年龄 日历年龄/cal.aBP 样品编号 (14C/ aBP) 中值 范围(1σ) 1.14～1.16 底栖有孔虫 −0.9 11050 ±30 BP 10702 10656～10748 520560 2.44～2.46 底栖有孔虫 −2 16110 ±40 BP 17097 17012～17182 520562 3.82～3.84 底栖有孔虫 −1.3 16830±40 BP 17996 17894～18099 520563 4.58～4.60 底栖有孔虫 −4 17820±60 BP 19206 19072～19341 520564 
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表 2 南黄海地区主要钻孔M/B界线深度
Table 2. Depth of the M/B boundary in major boreholes in the South Yellow Sea
钻 孔 水深/m 进尺/m 取芯率/% B/M界线深度/m 地理坐标 文献来源 SYS90-1A 69.3 90.1 93 74.2 33°49′N、123°44′E 本文 DLC70-3 73 71.2 93 59.08 36°38′N 、23°33′E [7] NHH01 73 125.6 91 68.64 35°13′N、123°13′E [20] EY02-2 79 70 86.5 63.29 34°30′N、123°30′E [19] QC2 49 108.8 90.4 79.95 34°18′N、122°16′E [18] CSDP-1 52.5 300.1 80 73.68 34°18′N、122°22′E [13] CSDP-2 22 2809.88 91.7 65.23 34°33′N 、21°15′E [21]
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