全新世以来珠江三角洲海鸥沙形成过程的地貌动力学分析

doi:10.11978/2018088

Abstract

Abstract:

Haiou Sandbody (HS) is a characteristic deposition body in the Pearl River delta. Based on the borehole data and the long-term morphodynamic model, the formation and evolution of the HS were studied. The bottom-up sedimentary sequence of the HI during Holocene is river facies, estuary shallow sea facies and delta facies. Since the maximum of the Holocene transgression, Humen tidal current and northeast-southwest tidal current have been the main forces influencing the formation and evolution of HS. From 6000 to 2500 a BP, due to the influence of the northeast to southwest fluctuating tide, the middle and northern parts of HS have been in a scour and non-sedimentary state. From 2500 to 1700 a BP, with the development of Panyu Plain, the northeast-southwest fluctuating trend gradually weakened, and the HS entered a rapid sedimentary period, with the mean deposition rate of about 15 mm·a ^-1. Between 1700 and 600 a BP, with the formation of the Shawan channel, the middle part of HS developed rapidly. To about 600 a BP, HS basically formed a dew surface.

Key words: Pearl River delta, Haiou sandbody, Holocene, evolution, long-term model

CLC Number:

P736.2

Wenyuan MO,Xing WEI,Chaoyu WU. Morphodynamic analysis of Haiou sandbody evolution in Pearl River delta since Holocene[J].Journal of Tropical Oceanography, 2019, 38(3): 68-78.

Figures/Tables 10

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References 19

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钻孔编号	经度	纬度	孔深/m	孔口高程/m
PRD14	113°31′33"E	22°56′22"N	11.69	1.55
PRD15	113°31′02"E	22°54′49"N	26.03	1.43
PRD16	113°32′45"E	22°52′28"N	27.81	1.73

钻孔编号	高程/m	测试材料	¹⁴C年龄/a BP(±σ)	实验室编号	测试方法
PRD14	-0.76	植物碎屑	3680±105	GC-06-1	常规
	-1.78	植物碎屑	1680±100	GC-06-2	常规
	-3.23	植物碎屑	2055±120	GC-06-3	常规
	-4.29	贝壳	1900±75	GC-06-7	常规
	-9.24	植物碎屑	25680±450	GC-06-4	常规
PRD15	-0.01	植物碎屑	1030±160	GC-06-28	常规
	-1.29	植物碎屑	1140±140	GC-06-27	常规
	-2.54	植物碎屑	1125±120	GC-06-26	常规
	-3.24	植物碎屑	1215±175	GC-06-25	常规
	-4.21	植物碎屑	1230±180	GC-06-24	常规
	-5.46	植物碎屑	1200±150	GC-06-29	常规
	-6.44	植物碎屑	1140±150	GC-06-23	常规
	-7.67	植物碎屑	1190±160	GC-06-22	常规
	-8.57	植物碎屑	1315±95	GC-06-21	常规
	-9.64	贝壳	7110±105	GC-06-19	常规
	-10.71	植物碎屑	7780±115	GC-06-20	常规
	-11.68	植物碎屑	8410±115	GC-06-13	常规
	-12.75	植物碎屑	7910±110	GC-06-23	常规
	-14.12	贝壳	8010±135	GC-06-14	常规
	-18.81	植物碎屑	27060±550	GC-06-15	常规
	-19.87	植物碎屑	29220±640	GC-06-16	常规
	-20.65	植物碎屑	34520±500	GC-06-17	常规
PRD16	-2.15	植物碎屑	1795±70	GC-06-49	常规
	-3.62	植物碎屑	1900±100	GC-06-48	常规
	-4.30	植物碎屑	2050±100	GC-06-42	常规
	-5.56	植物碎屑	2090±100	GC-06-43	常规
	-6.73	植物碎屑	2410±100	GC-06-44	常规
	-7.80	贝壳	4040±150	GC-06-45	常规
	-8.55	贝壳	6570±140	GC-06-46	常规
	-11.67	植物碎屑	24800±750	GC-06-47	常规
	-13.14	植物碎屑	26840±450	GC-06-41	常规
	-14.31	植物碎屑	30230±600	GC-06-40	常规
	-15.28	植物碎屑	31745±700	GC-06-39	常规
	-16.45	植物碎屑	33340±1000	GC-06-38	常规

深度/m	沉积物基本描述	粒度		颜色反射率/％	沉积环境
深度/m	沉积物基本描述	平均粒径/Φ	分选性	颜色反射率/％	沉积环境
0~2.92	上端为洪泛沉积物, 往下为黑色的富含有机质沼泽相沉积物。粒度向上细化, 分选差	2.27~5.85 (平均4.15)	1.89~2.62 (平均2.28)	2.75~6.84 (平均为4.88)	沼泽相
3.14~3.89	灰色粉沙质沙, 含少量淤泥。粒度变化较大, 向上先粗化再细化, 分选差	3.33~4.36 (平均3.91)	1.81~2.53 (平均2.26)	4.70~7.24 (平均为5.69)	涨潮三角洲高潮坪
4.21~5.70	厚沙层与薄粉沙淤泥互层。粒度变化较大, 向上先粗化再细化, 分选中等	1.91~4.92 (平均3.12)	1.79~2.50 (平均2.10)	3.67~7.12 (平均5.29)	涨潮三角洲中潮坪
5.70~6.90	分选中等的深灰色中粗沙, 沙的含量大于85%。含有大量比较完整的大块牡蛎和小贝壳	1.15~1.62 (平均1.39)	1.44~2.25 (平均1.95)	5.75~10.90 (平均8.10)	涨潮三角洲低潮坪
9.09~6.90	杂色风化沙质粉沙层, 呈灰白色、黄色、红色, 即存在两个不整合面				晚更新世沉积

Morphodynamic analysis of Haiou sandbody evolution in Pearl River delta since Holocene

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