Citation:

s00367-004-0185-y

Name: Age determination of sediment core V14 in the Tai O Bay (Table 1)
Published: 2005
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

High-resolution boomer profiles from Tai O Bay, Hong Kong SAR, were ground-truthed using ten discontinuously sampled boreholes penetrating bedrock with a maximum length of 82.1 m. The relationship between depth below seabed and seismic profiles was established through the measurement of two borehole compressional-wave velocity profiles. In departure from previous interpretations, nine Quaternary seismic units were identified, which can be divided into eight systems tracts formed by cycles of fourth-order sea-level fluctuations dating back at least to marine isotope stage (MIS) 7 (ca. 190-245 ka). These consist of two lowstand systems tracts, two transgressive systems tracts, and four highstand systems tracts. Secondary unconformities within the highstand deposits are interpreted to document fifth-order sea-level fluctuations. Lowstand deposits are less common because, as soon as the sea level drops by a few metres, Tai O Bay becomes sub-aerially exposed, leading to widespread non-deposition or erosion. At the same time, extensive fluvial erosion and channel incision take place. Filling of the fluvial channels occurs during rising sea level. Lowstand sediments (if present) are generally landslide deposits laid down on a basal alluvial plain. Uncorrected accelerator mass spectrometry (AMS) radiocarbon dates of mollusc shells show that the depositional environment was marine since 6.2 ka, becoming gradually more brackish as a result of progradation of the Pearl River delta. The computed average sedimentation rate for the period 6.2-4.1 ka is 4.4 m/1,000 year, and approximately 1 m/1,000 year since 4.1 ka.

Coverage:

Latitude: 22.416667 * Longitude: 113.833333

Minimum DEPTH, sediment/rock: 3.255 m * Maximum DEPTH, sediment/rock: 13.880 m

Event(s):

Tai_O_Bay_V14 * Latitude: 22.416667 * Longitude: 113.833333 * Method/Device: Vibro corer (VC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Depth, top/min	Depth top	m	Bahr, André
3	Depth, bottom/max	Depth bot	m	Bahr, André
4	Sample code/label	Sample label		Bahr, André
5	Age, dated material	Dated material		Bahr, André
6	Age, dated	Age dated	ka	Bahr, André	Age, 14C AMS
7	Age, dated, error to older	Age e +	ka +	Bahr, André	Age, 14C AMS
8	Age, dated, error to younger	Age e -	ka -	Bahr, André	Age, 14C AMS
9	δ13C, skeletal carbonate	δ13C skel carb	‰ PDB	Bahr, André
10	δ13C, standard deviation	δ13C std dev	±	Bahr, André

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

70 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Depth sed [m]	2 Depth top [m]	3 Depth bot [m]	4 Sample label	5 Dated material	6 Age dated [ka]	7 Age e + [ka +]	8 Age e - [ka -]	9 δ13C skel carb [‰ PDB]	10 δ13C std dev [±]
3.255	3.25	3.26	KIA9141	Dentalium octangulatum	2.960	0.030	0.030	0.55	0.19
3.765	3.76	3.77	KIA9142	Paphia undulata	3.885	0.035	0.035	-1.68	0.31
4.440			KIA9143	Scarpharca sp.	4.125	0.045	0.045	-0.40	0.14
7.640	7.63	7.65	KIA9144	Paphia undulata	6.680	0.060	0.055	-2.18	0.12
9.505	9.49	9.52	KIA9145	Placuna placenta	8.045	0.045	0.045	-2.03	0.25
11.375	11.37	11.38	KIA9146	Scarpharca sp.	6.745	0.040	0.040	-5.30	0.13
13.535	13.52	13.55	KIA9147	Sinovacula constricta	6.180	0.045	0.045	0.80	0.12
13.880	13.87	13.89	KIA9148	Paphia undulata	6.335	0.040	0.040	-3.32	0.10