| 摘要: |
| 为了分析南海北部上陆坡东沙隆起西侧海域海底稳定性, 对A和B两个岩芯进行了AMS14C测年、浮游有孔虫氧同位素分析、粉色红拟抱球虫Globigerinoides ruber鉴定、粒度分析等工作。综合研究表明, A、B岩芯分别发育了距今920 kaBP、960 kaBP以来的更新世、全新世地层。A岩芯3.3～14.08 m层位地层发生了倒转, 这与3.3m、6.12～6.18 m发育的两个浊积层有关。在71.5～71.63 m(冰期370 kaBP左右)也发育一浊积层。B 岩芯在9.2 m、25.2～28.6 m等层位发育了浊积层。同样位于陆坡坡折, 水深较大的A岩芯, 由于滑坡导致的浊流活动略强一些。 |
| 关键词: 南海北部 层倒转 粉色Globigerinoides ruber 浊流沉积 沉积速率 |
| DOI：10.11759/hykx20171101003 |
| 分类号: |
| 基金项目:南海深水油气开发示范工程(2011ZX05056); 国家自然基金面上项目(41576056); 南海北部陆坡区深水浅层沉积物沉积环境与沉积规律(G1417CS-B12C046) |
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| Turbidites at the continental slope on the west side of Dongsha uplift in the northern South China Sea |
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ZHOU Yang-rui,ZHU You-sheng,ZHOU Song-wang,LIU Jian-tao,WANG Shi-long,ZHUANG Li-hua
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| Abstract: |
| To analyze the seabed stability in the paleoenvironmental evolution of the west side of Dongsha uplift area in the northern South China Sea slope, two sample cores A and B were analyzed by AMS radiocarbon-14 dating analysis, planktonic foraminifer oxygen isotope analysis, pink Globigerinoides ruber ruber identification, organic analysis, and granularity analysis. The comprehensive study showed that layers in cores A and B were respectively developed in the Pleistocene and Holocene layers since about 920 kaBP and 960 kaBP. A stratigraphic reversal was found in the layer from 3.3 m to 14.08 m in core A, which was related to the turbidite at 3.3 m and 6.12–6.18 m. There was a turbidite at 71.5–71.63 m that was about 370 ka BP in core A and two turbidites at 9.2 m and 25.2–28.6 m in core B. Although the two cores are located at the same slope break, the landslide activity caused by turbidity was slightly stronger in core A than that in core B. |
| Key words: the northern South China Sea pink Globigerinoides ruber the reverse of stratum turbidite sedimentation rate |
