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Luminescence chronology of fluvial and marine records from subsurface core in Kaveri delta, Tamil Nadu: Implications to sea level fluctuations

Kartika Goswami
Kartika Goswami
, 
Sivakumar Krishnan
Sivakumar Krishnan
, 
Anbarasu Kumerasan
Anbarasu Kumerasan
, 
Senthil Kumar Sadasivam
Senthil Kumar Sadasivam
, 
Pankaj Kumar
Pankaj Kumar
 and 
Manoj. K. Jaiswal
Manoj. K. Jaiswal
   | Dec 19, 2019
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Article Category: Regular Articles
Published Online: Dec 19, 2019
Page range: 125 - 137
Received: Jan 02, 2019
Accepted: May 28, 2019
DOI: https://doi.org/10.1515/geochr-2015-0112
Keywords
© 2019 K. Goswami., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Location map of the study area with the geomorphological map of the Kaveri delta showing various geomorphological features. The easternmost VKI core has been undertaken for the present study. White circles depict the borehole sites for a few more core samples for future studies.
Location map of the study area with the geomorphological map of the Kaveri delta showing various geomorphological features. The easternmost VKI core has been undertaken for the present study. White circles depict the borehole sites for a few more core samples for future studies.

Fig. 2

(a) Chronostratigraphic cross-section of the VKI core, taken along the NS trending palaeo beach ridge parallel to the present coast. (b) Depth vs sand (%) graph showing a distinct change in the sediment type down the core. (c) Depth vs organic matter (%) graph showing variation in the total organic matter content down the core.
(a) Chronostratigraphic cross-section of the VKI core, taken along the NS trending palaeo beach ridge parallel to the present coast. (b) Depth vs sand (%) graph showing a distinct change in the sediment type down the core. (c) Depth vs organic matter (%) graph showing variation in the total organic matter content down the core.

Fig. 3

(a) Preheat plateau test of VKI 12 shows 220°C as optimal preheat temperature (b) Laboratory generated dose growth curve; (inset) BSL shine down curve of VKI 12. (c, d) Dose recovery tests of VKI 4 and VKI 13 respectively (RD = Recovered doses), R1, R2, R3 are the regenerated laboratory doses shown in different colours for 5 different aliquots, laboratory doses given are shown in red. (e, f) Frequency histograms of VKI 4 and VKI 13 showing < 40% overdispersion. (g,h) radial plots of the measured doses of samples (VKI 4, VKI 12) respectively.
(a) Preheat plateau test of VKI 12 shows 220°C as optimal preheat temperature (b) Laboratory generated dose growth curve; (inset) BSL shine down curve of VKI 12. (c, d) Dose recovery tests of VKI 4 and VKI 13 respectively (RD = Recovered doses), R1, R2, R3 are the regenerated laboratory doses shown in different colours for 5 different aliquots, laboratory doses given are shown in red. (e, f) Frequency histograms of VKI 4 and VKI 13 showing < 40% overdispersion. (g,h) radial plots of the measured doses of samples (VKI 4, VKI 12) respectively.

Fig. 4

Benthic foraminifera: 1 – Ammonia beccarii, 2 – Pararotaliaozawai, 3 – Nonionellinalabradoricum, 4 – Asterorotaliatrispinosa, 5 – Flintinabradyana, 6 – Spiroculinaantilluram, 7 – Elphidiumadvenum, 8 – Elphidiumsp, 9 – Triloculinatrigonalla, 10 – Oolinahexagona, 11 – Fursenkoinacomplanta (stress marker), 12 – Bolivinapseudolobata, 13 – Buliminagibba (stress markers), 14, 15 – Bolivinastraitula (stress markers). Planktic foraminifera: 16 – Globigerina bulloides, 17, 18 – Globigerina sp
Benthic foraminifera: 1 – Ammonia beccarii, 2 – Pararotaliaozawai, 3 – Nonionellinalabradoricum, 4 – Asterorotaliatrispinosa, 5 – Flintinabradyana, 6 – Spiroculinaantilluram, 7 – Elphidiumadvenum, 8 – Elphidiumsp, 9 – Triloculinatrigonalla, 10 – Oolinahexagona, 11 – Fursenkoinacomplanta (stress marker), 12 – Bolivinapseudolobata, 13 – Buliminagibba (stress markers), 14, 15 – Bolivinastraitula (stress markers). Planktic foraminifera: 16 – Globigerina bulloides, 17, 18 – Globigerina sp

Fig. 5

Summary of sea level fluctuations over the last 150 ka. The black bars represent durations of deposition in the core. The depositional periods in the core matches closely with sea level highs. The grey line depicts the present sea level. (Modified after Gibling et al., 2005; Waelbroeck et al., 2002; Singhvi et al., 2012).
Summary of sea level fluctuations over the last 150 ka. The black bars represent durations of deposition in the core. The depositional periods in the core matches closely with sea level highs. The grey line depicts the present sea level. (Modified after Gibling et al., 2005; Waelbroeck et al., 2002; Singhvi et al., 2012).

OSL age table of samples analysed from VKI core showing various parameters for age calculations.

S. No Sample Depth U Th K Dose Rate Dose Age No. of Discs
Name (m) (ppm) (ppm) (%) (Gy/ka) (Gy) (ka)
1 VKI 2 2.6 0.68 ± 0.02 5.17 ± 0.03 1.46 ± 0.01 1.72 ± 0.12 5.81 ± 0.13 3.4 ± 0.2 22
2 VKI 3 4.4 0.55 ± 0.01 9.28 ± 0.07 0.64 ± 0.02 1.24 ± 0.08 6.14 ± 0.19 5.0 ± 0.4 27
3 VKI 4 5.8 1.48 ± 0.03 12.86 ± 0.19 1.50 ± 0.06 1.80 ± 0.23 11.34 ± 0.30 6.3 ± 0.8 30
4 VKI 5 8.0 1.94 ± 0.02 9.30 ± 0.09 1.23 ± 0.07 1.52 ± 0.20 8.90 ± 0.33 5.9 ± 0.8 32
5 VKI 6 9.9 1.41 ± 0.01 11.63 ± 0.22 1.35 ± 0.01 1.55 ± 0.21 No signal - -
6 VKI 7 11.9 1.98 ± 0.04 9.24 ± 0.07 1.31 ± 0.01 1.57 ± 0.21 14.34 ± 0.37 9.1 ± 1.2 21
7 VKI 8 13.8 0.69 ± 0.01 9.62 ± 0.18 0.55 ± 0.01 1.17 ± 0.08 67.05 ± 3.57 58 ± 5 25
8 VKI 10 16.9 1.07 ± 0.01 12.84 ± 0.01 0.62 ± 0.01 1.44 ± 0.10 117.50 ± 7.17 82 ± 7 13
9 VKI 11 19.4 0.93 ± 0.01 14.48 ± 0.16 0.41 ± 0.01 1.33 ± 0.09 117.90 ± 5.82 89 ± 7 30
10 VKI 12 20.8 1.48 ± 0.02 12.66 ± 0.12 0.50 ± 0.01 1.40 ± 0.09 143.50 ± 5.28 102 ± 8 33
11 VKI 12F 21.2 1.48 ± 0.02 12.66 ± 0.12 0.50 ± 0.01 1.37 ± 0.10 166.60 ± 10.19 121 ± 11 20
12 VKI 13 22.8 1.07 ± 0.01 4.67 ± 0.03 0.60 ± 0.01 0.96 ± 0.07 134.38 ± 7.52 140 ± 12 21
13 VKI 14 24.7 1.04 ± 0.02 7.05 ± 0.16 0.59 ± 0.01 1.08 ± 0.07 153.97 ± 6.66 143 ± 11 16

Table showing relative abundance of foraminifera: benthic, planktic and stress markers down the VKI core.

S. No Sample Name Depth (m) Benthic (%) Planktic (%) Stress markers (%)
1 VKISS 10 5.6 63.2 36.8 1.6
2 VKISS 11 5.9 56.1 43.9 1.2
3 VKISS 12 6.4 38.1 40.9 3.7
4 VKISS 13 7 46.6 53.4 8.8
5 VKISS 14 7.5 61.2 38.7 7.3
6 VKISS 15 8 52 48 2.5
7 VKISS 16 8.6 56.9 43.1 1.2
8 VKISS 17 9 56 44 5.7
9 VKISS 18 9.5 69.2 30.7 10.2
10 VKISS 19 10 49.3 50.6 9.9
11 VKISS 20 10.5 42.3 57.7 5.3
12 VKISS 21 10.9 89 11 0
13 VKISS 40 21 90.4 9.5 0
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Language:
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