Age Determination of the Kawagodaira Volcanic Eruption in Japan by 14C Wiggle-Matching

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 748-752 ◽  
Author(s):  
Sayaka Tani ◽  
Hiroyuki Kitagawa ◽  
Wan Hong ◽  
Jung Hun Park ◽  
Ki Suk Sung ◽  
...  
Keyword(s):  
Confidence Level ◽  
Volcanic Eruption ◽  
Age Determination ◽  
Japanese Cedar ◽  
Central Japan ◽  
Volcano Eruption ◽  
Izu Peninsula ◽  
Pumice Flow ◽  
Eruption Age

The Kawagodaira Volcano is located on the northwest slope of Amagi Volcano on the Izu Peninsula of central Japan. The fine pumice that erupted from Kawagodaira Volcano is widely distributed in the central and western parts of the Japanese mainland. Here, we report an accurate eruption age determined by radiocarbon wiggle-matching of a Japanese cedar timber excavated from the pyroclastic deposit at the pumice flow terminal of Kawagodaira Volcano. The 14C wiggle-match estimate for the Kawagodaira Volcano eruption is 1210–1187 cal BC (95.4% confidence level).

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

2019 ◽  
Vol 46 (1) ◽  
pp. 49-56
Author(s):  
Yorinao Shitaoka ◽  
Takeshi Saito ◽  
Junji Yamamoto ◽  
Masaya Miyoshi ◽  
Hidemi Ishibashi ◽  
...  
Keyword(s):  
Lava Flow ◽  
Soil Layer ◽  
Age Determination ◽  
Osl Dating ◽  
Basaltic Lava ◽  
Dating Methods ◽  
Paleomagnetic Dating ◽  
Eruption Age ◽  
Basaltic Lava Flow

Abstract We estimated the eruption age of Kannabe volcano, located in southwestern Japan. Although the eruption age had been estimated using tephrochronology and K-Ar dating, the precision of its age determination left some room for improvement. The latest eruption age of Kannabe volcano is well constrained by wide spread tephras to ca. 7.2–30 ka. We applied paleomagnetic dating to a basaltic lava and optically stimulated luminescence (OSL) dating to a soil layer, which are associated with the Kannabe volcano. The soil layer above the Kannabe scoria was newly dated to be 21 ± 6 ka, as inferred from OSL dating. We also made paleomagnetic investigation to estimate the eruption age of the Kannabe basaltic lava. Paleomagnetic data of 23 rock samples from six locations in the Kannabe basaltic lava showed good mutual agreement. The average of remanent magnetizations yields declination of 0.3° and inclination of 65.9° with 95% confidence limit of 2.7°. This paleomagnetic direction with a relatively steep inclination is thought to be correlated with the paleomagnetic secular variation data of sediments in Lake Biwa at ca. 21.5 ka. Based on that information from multi-dating, we inferred that the Kannabe volcano erupted at ca. 22 ka. This result presents profound scientific implications for the precise age determination of young basaltic lava flow, for which few dating methods exist.

Analysis of Fibronectin and TGF-β1 Immunoexpression to Determination of Wound Vitality in Wistar Rats (Rattus norvegicus)

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Nita Novita ◽  
Hasrayati Agustina ◽  
Bethy S. Hernowo ◽  
Abdul H. Hassan
Keyword(s):  
Rattus Norvegicus ◽  
Wistar Rats ◽  
Age Determination ◽  
Scientific Field ◽  
Wound Age ◽  
Forensic Practice ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Tgf Β1

Wound examination is indispensable in forensic practice. The scientific field of wound age determination has advanced progressively during recent years.The purpose of this study was to determine the differences of fibronectin and TGF-β1 expression in both antemortem and postmortem wounds. This study was an experimental with completely randomized design.  The skin wounds (vital and postmortem) were taken from fourty Wistar rats and divided into 10 groups of rats. Immunohistochemical staining was performed to determine the differences between antemortem and postmortem wounds. The result showed that in 30 minutes after antemortem wound infliction, all of samples showed weak reactivity for fibronectin and TGF-β1 (100%).  In first hour after wound infliction, 3 samples (75%) showed weakly positive and 1 sample (25%) strongly positive for fibronectin and TGF-β1.  In 2 hour after wound infliction, 1 sample (25%) showed weakly positive and 3 sample (75%) strongly positive for fibronectin and TGF-β1.  In 3 and 4 hour after wound infliction, all of samples strongly positive for fibronectin and TGF-β1.  In postmortem wound, all of samples showed negativity for fibronectin and TGF-β1. In conclusion, fibronectin and TGF-β1 may be useful in the determination of wound vitality. Keywords: wound, fibronectin, TGF-β1, vitality

scholarly journals Directly ageing the Caribbean spiny lobster, Panulirus argus with validated band counts from gastric mill ossicles

2018 ◽  
Vol 76 (2) ◽  
pp. 442-451 ◽  
Author(s):  
Gaya Gnanalingam ◽  
Mark J Butler ◽  
Thomas R Matthews ◽  
Emily Hutchinson ◽  
Raouf Kilada
Keyword(s):  
Spiny Lobster ◽  
Age Determination ◽  
Florida Keys ◽  
Panulirus Argus ◽  
Gastric Mill ◽  
Coefficients Of Variation ◽  
The Caribbean ◽  
First Time ◽  
Reader Experience

Abstract In crustaceans, ecdysis was long believed to result in the loss and replacement of all calcified structures, precluding the use of conventional ageing methods. However, the discovery of bands in the gastric ossicles of several crustaceans with some correlation with age suggests that direct age estimation may be possible. We applied this method to a tropical spiny lobster, Panulirus argus, one of the most iconic and economically valuable species in the Caribbean. The presence of growth bands was investigated using wild lobsters of unknown age and was validated with captive reared lobsters of known age (1.5–10 years) from the Florida Keys, Florida (USA). Bands were consistently identified in ptero- and zygo-cardiac ossicles of the gastric mill and did not appear to be associated with moulting. Validation with known age animals confirms that bands form annually. Counts between independent readers were reproducible with coefficients of variation ranging from 11% to 26% depending on reader experience and the structure used. This study demonstrates, for the first time, that direct age determination of P. argus is possible.

Using the isotope dating of endocontact hybrid rocks for the age determination of mafic rocks (southern Siberian craton)

2013 ◽  
Vol 54 (11) ◽  
pp. 1340-1351 ◽  
Author(s):  
D.P. Gladkochub ◽  
T.V. Donskaya ◽  
M.T.D. Wingate ◽  
A.M. Mazukabzov ◽  
S.A. Pisarevsky ◽  
...  
Keyword(s):  
Siberian Craton ◽  
Age Determination ◽  
Mafic Rocks ◽  
Isotope Dating

Age determination of the African lion (Panthera leo)

2009 ◽  
Vol 185 (1) ◽  
pp. 115-146 ◽  
Author(s):  
G. L. Smuts ◽  
J. L. Anderson ◽  
J. C. Austin
Keyword(s):  
Age Determination ◽  
Panthera Leo ◽  
African Lion
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