南海北部神狐海域SH37岩芯浊流沉积及其物源分析

肖倩文; 冯秀丽; 苗晓明

doi:10.16562/j.cnki.0256-1492.2021011901

南海北部神狐海域SH37岩芯浊流沉积及其物源分析

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: 国家重点研发计划项目“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: 肖倩文（1997—），女，硕士研究生，主要从事海洋沉积研究，E-mail：xiaoqianwen0215@163.com

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

中图分类号: P736.21

收稿日期: 2021-01-19

修回日期: 2021-03-02

刊出日期: 2021-10-28

Turbidity deposits and their provenance: evidence from core SH37 in Shenhu area of the 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: FENG Xiuli, fengxiuli@ouc.edu.cn

Received Date: 19 January 2021

Revised Date: 02 March 2021

Publish Date: 28 October 2021

摘要

摘要:
为了分析南海北部神狐海域的浊流沉积，对SH37岩心进行了沉积物粒度测试、AMS¹⁴C测年和地球化学元素测试等工作。根据粒度特征和C-M图等分析认为，200～300 cm层位属于浊流沉积，该层沉积物粒度较粗，分选较差，敏感粒级端元EM3与Zr/Rb元素比值在该层均含量较高，且有地层年龄倒转现象。推测浊流成因为海平面的变化或重力作用引起的陆坡滑坡。稀土元素含量与（La/Sm）_UCC-（Gd/Yb）_UCC、（Gd/Yb）_UCC-（Gd/Lu）_UCC散点图结果显示，SH37岩心沉积物来源较为一致，主要来自于珠江和台湾岛内河流。
- 浊流沉积 /
- 地层倒转 /
- 滑坡 /
- 物源 /
- 神狐海域
Abstract:
In order to seek for the origin of the turbidite deposits in the Shenhu area of the northern South China Sea, grain size analysis, AMS¹⁴C dating and element geochemical analysis have been carried out for the core of SH37. Grain size distribution and C-M pattern suggest that the core deposits between the interval of 200～300 cm belong to turbidite deposits. The interval is composed of relatively coarse sediments with bad sorting, as EM3 and the ratio of Zr/Rb are rather high. A phenomenon of age reversal is observed. It is speculated that the turbidity current is probably triggered by sea level change or gravity. Rare earth elements and scatter plots of (La/Sm)_UCC-(Gd/Yb)_UCC and (Gd/Yb)_UCC-(Gd/Lu)_UCC suggest that the turbidite sediments are mainly sourced from the Pearl River system and the rivers on the Taiwan Island.
- turbidity deposit /
- strata inversion /
- landslide /
- provenance /
- Shenhu area

HTML全文

图 1 神狐海域构造图^[17]

Figure 1.

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图 2 粒度组成及参数垂向变化图

Figure 2.

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图 3 粒度端元提取结果

Figure 3.

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图 4 SH37岩芯粒度、地球化学元素比值及¹⁴C年龄随深度的变化

Figure 4.

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图 5 C-M图解

Figure 5.

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图 6 南海北部陆坡分段^[[30]]

Figure 6.

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图 7 SH37岩芯稀土元素球粒陨石标准化曲线

Figure 7.

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图 8 物源判别散点图

Figure 8.

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表 1 AMS¹⁴C测年结果

Table 1. Results of AMS¹⁴C dating

取样深度/cm	样品种类	AMS ¹⁴C年龄/aBP	校正后日历年龄/cal.aBP
11～12	Globorotalia inflata	680±30	440～225
133～134	Globorotalia inflata	11020±30	12671～12442
218～219	Globorotalia inflata	13120±30	15298～14895
265～266	混合种	12590±40	14206～13889
426～430	混合种	13940±40	16511～16076

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表 2 研究区样品各沉积组分含量与粒度参数

Table 2. Contents and grain size parameters of the sediments

粒度参数/组分	砂/%	粉砂/%	黏土/%	平均粒径/μm	中值粒径/μm	分选系数	偏态	峰态
最大值	4.19	78.24	29.24	10.14	11.41	1.76	0.29	1.14
最小值	0.00	69.32	19.65	6.76	7.70	1.48	0.12	0.97
平均值	1.33	73.30	25.37	7.95	9.14	1.59	0.22	1.03

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表 3 稀土元素及参数含量

Table 3. Contents of rare earth elements and parameters

元素	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
样品最大值	39.10	79.90	9.38	33.20	6.47	1.10	4.58	0.65	4.12	0.70	1.95	0.33	1.99	0.31
样品最小值	27.60	54.90	6.45	23.70	4.50	0.86	3.20	0.45	2.49	0.49	1.32	0.20	1.23	0.20
样品平均值	32.79	66.20	7.75	27.98	5.39	0.97	3.78	0.54	2.98	0.57	1.58	0.24	1.54	0.24
珠江^[20]	53.82	103.97	13.08	47.98	9.23	1.92	7.91	1.25	6.53	1.33	3.55	0.62	3.66	0.56
台湾^[21]	41.89	82.78	9.35	34.97	6.32	1.34	6.11	0.89	5.09	0.96	2.87	0.43	2.85	0.43
吕宋岛北部^[22]	33.34	61.51	6.91	25.11	4.36	1.15	3.61	0.52	3.07	0.68	2.00	/	1.91	0.31

元素参数	∑REE	∑LREE	∑HREE	∑REE/ HREE	δEu	δCe	（La/Sm） ucc	（Gd/Lu） ucc	（Gd/Yb） ucc
样品最大值	183.02	169.14	13.88	13.90	0.67	1.03	1.03	1.45	1.92
样品最小值	128.97	118.92	9.69	11.18	0.56	0.93	0.83	1.06	1.31
样品平均值	152.55	141.08	11.48	12.32	0.61	0.98	0.92	1.32	1.57
珠江^[20]	255.40	229.99	25.41	8.98	0.66	0.92	0.88	1.18	1.48
台湾^[21]	196.29	176.66	19.63	8.94	0.64	0.98	0.99	1.21	1.08
吕宋岛北部^[22]	/	132.38	/	/	0.88	0.92	0.71	0.97	1.07
注：元素含量单位为μg /g。

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