南海西北部莺琼陆坡36.6 ka以来的浊流沉积

许莎莎; 冯秀丽; 冯利; 肖晓; 刘爽

doi:10.16562/j.cnki.0256-1492.2019112701

南海西北部莺琼陆坡36.6 ka以来的浊流沉积

1.
中国海洋大学海洋地球科学学院，青岛 266100

2.
海底科学与探测技术教育部重点实验室，青岛 266100

基金项目: 国家重点研发计划"ROV精准取样技术应用与南海北部深海沉积过程研究"（2017YFC0306703）

详细信息

作者简介: 许莎莎（1993—），女，硕士研究生，地质工程专业，E-mail：1228523269@qq.com

通讯作者: 冯秀丽（1962—），女，博士，教授，主要从事海洋沉积与工程环境研究，E-mail：fengxiuli@ouc.edu.cn

中图分类号: P736.4

收稿日期: 2019-11-27

修回日期: 2020-01-08

刊出日期: 2020-10-25

Turbidite records since 36.6 ka at the Yingqiong continental slope in the northwest of South China Sea

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

2.
Key Laboratory of Submarine Geosciences and Prospecting, Qingdao 266100, China

More Information

Corresponding author: e-mail: fengxiuli@ouc.edu.cn

Received Date: 27 November 2019

Revised Date: 08 January 2020

Publish Date: 25 October 2020

摘要

摘要:
对取自南海西北部莺琼陆坡的ZK3岩心进行了AMS¹⁴C测年、沉积物粒度分析、地球化学元素分析等，结合萨哈-兰迪姆相浊流环境判别及C-M图的分析结果，识别了南海西北部莺琼陆坡的浊流沉积，讨论了浊流发育的成因及环境气候变化对南海陆坡沉积环境的影响。研究表明：ZK3岩心主要发育了36.6 kaBP以来的晚更新世和全新世地层，浊流沉积发育，初步识别出7.4～8.3、12.8～13.5、15.5～17.2、18.7～20.7 m这4个特征明显的浊积层，其中有3次浊积事件发生于末次冰期。有利的地形、丰富的物源、活跃的海平面变化及气候变化是触发浊流的主要因素。
- 浊流沉积 /
- 粒度 /
- 海平面变化 /
- 南海西北部
Abstract:
The cores of ZK3 collected from the Yingqiong slope in the northwest of South China Sea were dated with AMS¹⁴C dating, and analyzed for grain sizes and geochemical elements. The Shakha-Landim method for discrimination of turbidity environment and the C-M diagram for turbidite deposits, are also used to recognize the turbidity sediments. Detailed discussion is devoted to the formation of turbidity current and the impacts of the climate change onto the sedimentary environment. The study shows that sediments of core ZK3 were deposited in the time of Pleistocene and Holocene since 36.6 ka. Four layers of turbidite with obvious features occur in the intervals of 7.4～8.3, 12.8～13.5, 15.5～17.2 and 18.7～20.7 m respectively, corresponding to three turbidity events during the last glacial stage. Favorable topography, abundant material supply, active sea level fluctuation and climate change are the main causes for the origin of the turbidity currents.
- turbidity sedimentation /
- grain size /
- sea level change /
- northwestern of South China Sea

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图 1 ZK3岩心位置图

Figure 1.

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图 2 ZK3岩心测年结果和沉积速率变化图

Figure 2.

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图 3 ZK3岩心沉积物类型三角图解

Figure 3.

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图 4 岩心沉积物组成与粒度参数垂向变化

Figure 4.

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图 5 ZK3岩心的粒度C-M图

Figure 5.

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图 6 海平面升降曲线

Figure 6.

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图 7 ZK3岩心元素比值及碳酸钙含量垂向变化

Figure 7.

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图 8 研究区周边洋流分布图（洋流模式参考文献[40-41]）

Figure 8.

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表 1 ZK3岩心沉积物组成与粒度参数

Table 1. Composition and grain size parameters of the sediments from core ZK3

粒度参数	砂/%	粉砂/%	黏土/%	M_d	M_z	σ_I	Sk_I	K_g
平均值	1.16	69.83	29.01	0.008	0.007	1.625	0.161	1.016
最大值	3.85	74.80	33.79	0.009	0.008	1.756	0.223	1.122
最小值	0.00	64.28	23.78	0.006	0.006	1.525	0.100	0.965

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表 2 ZK3岩心各层位萨哈-兰迪姆相浊流环境判别结果

Table 2. Identification of Turbidity current environment with Sakha-Landim facies diagram for each layer of core ZK3

层位	Y值	层位	Y值
ZK3 S-9-7.40	5.619	ZK3 S-29-16.20	5.697
ZK3 S-10-7.70	5.606	ZK3 S-31-17.20	5.741
ZK3 S-11-8.30	5.657	ZK3 S-35-18.70	5.885
ZK3 S-22-12.80	5.530	ZK3 S-37-19.40	5.748
ZK3 S-24-13.50	5.549	ZK3 S-41-20.70	5.860
ZK3 S-28-15.50	5.521	−	−

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