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Eruption age of Kannabe volcano using multi-dating: Implications for age determination of young basaltic lava flow

Yorinao Shitaoka
Yorinao Shitaoka
, 
Takeshi Saito
Takeshi Saito
, 
Junji Yamamoto
Junji Yamamoto
, 
Masaya Miyoshi
Masaya Miyoshi
, 
Hidemi Ishibashi
Hidemi Ishibashi
 and 
Tsutomu Soda
Tsutomu Soda
   | Apr 22, 2019
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Article Category: Regular Articles
Published Online: Apr 22, 2019
Page range: 49 - 56
Received: Apr 23, 2018
Accepted: Mar 25, 2019
DOI: https://doi.org/10.1515/geochr-2015-0108
Keywords
© 2018 Y. Shitaoka, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Index (a) and locality (b) maps. Sampling locations of Kannabe scoria cone in southwestern Japan for paleomagnetic samples (locs. 1–6) and OSL dating (loc. a). Outcrop of loc. b is shown as AT tephra under Kannabe scoria (see Fig. 2).
Index (a) and locality (b) maps. Sampling locations of Kannabe scoria cone in southwestern Japan for paleomagnetic samples (locs. 1–6) and OSL dating (loc. a). Outcrop of loc. b is shown as AT tephra under Kannabe scoria (see Fig. 2).

Fig. 2

Geological columnar sections in locs. a and b of Fig. 1. Closed circle show sampling positions for OSL dating. The estimated OSL age is also shown.
Geological columnar sections in locs. a and b of Fig. 1. Closed circle show sampling positions for OSL dating. The estimated OSL age is also shown.

Fig. 3

Optical photomicrograph of a Kannabe lava sample 4 under crossed polarizer: Ol, olivine; Pl, plagioclase.
Optical photomicrograph of a Kannabe lava sample 4 under crossed polarizer: Ol, olivine; Pl, plagioclase.

Fig. 4

Preheat temperature plateau measurement. Averages of three aliquots are shown at the respective temperatures. A preheating plateau is apparent at 220–260°C.
Preheat temperature plateau measurement. Averages of three aliquots are shown at the respective temperatures. A preheating plateau is apparent at 220–260°C.

Fig. 5

Vector end-point diagrams of demagnetization results for typical Kannabe samples. Solid and open circles respectively represent projections onto the horizontal and N–S vertical planes: (a) one magnetic component with smooth decay to the origin; (b) noisy trajectories with scatter; and (c) two magnetic components.
Vector end-point diagrams of demagnetization results for typical Kannabe samples. Solid and open circles respectively represent projections onto the horizontal and N–S vertical planes: (a) one magnetic component with smooth decay to the origin; (b) noisy trajectories with scatter; and (c) two magnetic components.

Fig. 6

Equal-area projection onto the lower hemisphere of magnetic components (solid circles) showing the mean direction (cross), its 95% confidence circle and present Earth’s magnetic field (square) around the studied area are shown. The mean direction and its 95% confidence limit from Torii et al. (1978) and from Morinaga et al. (2000) are also shown respectively as open triangles and open circles.
Equal-area projection onto the lower hemisphere of magnetic components (solid circles) showing the mean direction (cross), its 95% confidence circle and present Earth’s magnetic field (square) around the studied area are shown. The mean direction and its 95% confidence limit from Torii et al. (1978) and from Morinaga et al. (2000) are also shown respectively as open triangles and open circles.

Fig. 7

a) OSL decay curve of natural and 45 Gy as regeneration dose. b) Growth curve of an aliquot for regenerative doses of 0, 15, 25, 35, and 45 Gy.
a) OSL decay curve of natural and 45 Gy as regeneration dose. b) Growth curve of an aliquot for regenerative doses of 0, 15, 25, 35, and 45 Gy.

Fig. 8

Dose distributions (n = 9) are shown as the radial plots.
Dose distributions (n = 9) are shown as the radial plots.

Fig. 9

Paleomagnetic direction from Kannabe lava shown on paleosecular variations from Lake Biwa after Hayashida et al. (2007). Bold lines and gray bars respectively represent the paleomagnetic direction and its 95% confidence angle.
Paleomagnetic direction from Kannabe lava shown on paleosecular variations from Lake Biwa after Hayashida et al. (2007). Bold lines and gray bars respectively represent the paleomagnetic direction and its 95% confidence angle.

Results of OSL dating.

Paleodose (Gy) Aliquots (n) U (ppm) Th (ppm) K (wt%) Water content (%) Annual dose (mGy/a) OSL age (ka)
34.7±1.6 9 / 15 1.25 ± 0.09 8.26 ± 0.42 0.74 ± 0.05 62 ± 6 1.62 ± 0.42 21 ± 6

Sampling localities and demagnetization results.

Sampling locality Sample name Demagnetization methods Demagnetization results
Number Latitude Longitude Dec (°) Inc (°) MAD(°)
1 35°29’9.599” 134°41’45.999” 264 thermally 5.6 68.2 0.3
1 272 thermally 12.8 64.7 0.4
282 thermally –23.3 65.5 0.2
291 thermally –11.3 66.3 0.3
301 thermally –4.8 67.8 0.8
2 35°29’27.599” 134°41’34.800” 191 thermally 22.9 51.3 0.4
201 thermally –3.8 63.7 1.4
211 thermally 2.8 65.9 0.5
3 35°29’31.199” 134°41’34.800” 222 thermally –5.9 68.3 0.3
231 thermally –14.7 67.5 0.4
241 thermally 12.9 68.7 0.2
251 thermally –23.7 61.6 1.8
4 35°29’16.799” 134°42’3.599” 41 magnetically 2.0 63.4 1.0
161 thermally 6.2 62.1 1.8
171 thermally –10.1 64.5 1.3
181 thermally 6.0 68.9 1.2
5 35°28’30.000” 134°42’46.799” 12 magnetically 4.9 69.1 0.9
31 magnetically 4.7 66.2 0.8
131 thermally 8.0 69.1 0.3
145 thermally 2.9 76.3 0.2
151 thermally 10.3 71.2 0.4
6 35°28’8.400” 134°46’37.199” 113 thermally 0.8 53.5 5.0
121 thermally –2.1 61.0 2.6

Protocol for SAR measurement.

Step Treatment Observed
1(a) Give dose, Di –
2 Preheat (240°C for 60 s) –
3 Stimulate for 100 s at 125°C Li
4 Give test dose, 5 Gy –
5 Cut heat (160°C) –
6 Stimulate for 100 s at 125°C Ti
7 Stimulate for 40 s at 250°C –
8 Return to 1 –
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