Fukui Prefectural Varve Museum: Difference between revisions
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Lake Suigetsu, one of [[Five Lakes of Mikata]], is located in Wakasa Town, Mikatakaminaka District, Fukui Prefecture. It is a [[Brackish water|brackish water lake]], with an area of 4.06 km², a perimeter of 9.85km, and the maximum depth of 38.0, making it largest among the five. It lacks directly inflowing river, which can disturb the precipitate on the lake bottom. Because of this, the sediments annually form varve and then remain undisturbed. In addition, the lack of oxygen in the water the lake bottom make it inhabitable to lifeforms which also helped to keep the varve undisturbed. Also, because of the [[Fault (geology)|fault]] running nearby, the lake gradually lowers its [[altitude]] and never filled up with sediments. With these serendipitous conditions combined, the varve found in the Lake Suigetsu is now known as “Miraculous Sediments”. |
Lake Suigetsu, one of [[Five Lakes of Mikata]], is located in Wakasa Town, Mikatakaminaka District, Fukui Prefecture. It is a [[Brackish water|brackish water lake]], with an area of 4.06 km², a perimeter of 9.85km, and the maximum depth of 38.0, making it largest among the five. It lacks directly inflowing river, which can disturb the precipitate on the lake bottom. Because of this, the sediments annually form varve and then remain undisturbed. In addition, the lack of oxygen in the water the lake bottom make it inhabitable to lifeforms which also helped to keep the varve undisturbed. Also, because of the [[Fault (geology)|fault]] running nearby, the lake gradually lowers its [[altitude]] and never filled up with sediments. With these serendipitous conditions combined, the varve found in the Lake Suigetsu is now known as “Miraculous Sediments”. |
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The investigation of Lake Suigetsu was started on 1991. In boring expedition on 2006, it was not possible to recover 70 m depth varve as one continuous core. Therefore the boring was conducted from 4 different spots, each 1 m core at a time. By matching varve patterns between the core samples, a 70 m-long varve was reconstituted. This equals to a 160,000 year-long varve without any discontinuity and named SG06 (from Suigetsu, 2006). A team of international collaboration members, Japan, UK, and Germany measured the ratio between a radiocarbon <sup>14</sup>C and a stable isotope <sup>12</sup>C throughout the layers of varve and obtained calibration data of [[radiocarbon dating]] 11,200 – 52,800 years ago. This result was published in Science<ref name="Bronk RamseyStaff2012">{{cite journal|last1=Bronk Ramsey|first1=C.|last2=Staff|first2=R. A.|last3=Bryant|first3=C. L.|last4=Brock|first4=F.|last5=Kitagawa|first5=H.|last6=van der Plicht|first6=J.|last7=Schlolaut|first7=G.|last8=Marshall|first8=M. H.|last9=Brauer|first9=A.|last10=Lamb|first10=H. F.|last11=Payne|first11=R. L.|last12=Tarasov|first12=P. E.|last13=Haraguchi|first13=T.|last14=Gotanda|first14=K.|last15=Yonenobu|first15=H.|last16=Yokoyama|first16=Y.|last17=Tada|first17=R.|last18=Nakagawa|first18=T.|title=A Complete Terrestrial Radiocarbon Record for 11.2 to 52.8 kyr B.P.|journal=Science|volume=338|issue=6105|year=2012|pages=370–374|issn=0036-8075|doi=10.1126/science.1226660}}</ref> |
The investigation of Lake Suigetsu was started on 1991. In boring expedition on 2006, it was not possible to recover 70 m depth varve as one continuous core. Therefore the boring was conducted from 4 different spots, each 1 m core at a time. By matching varve patterns between the core samples, a 70 m-long varve was reconstituted. This equals to a 160,000 year-long varve without any discontinuity and named SG06 (from Suigetsu, 2006). A team of international collaboration members, Japan, UK, and Germany measured the ratio between a [[radiocarbon]] <sup>14</sup>C and a [[stable isotope]] <sup>12</sup>C throughout the layers of varve and obtained calibration data of [[radiocarbon dating]] 11,200 – 52,800 years ago. This result was published in Science<ref name="Bronk RamseyStaff2012">{{cite journal|last1=Bronk Ramsey|first1=C.|last2=Staff|first2=R. A.|last3=Bryant|first3=C. L.|last4=Brock|first4=F.|last5=Kitagawa|first5=H.|last6=van der Plicht|first6=J.|last7=Schlolaut|first7=G.|last8=Marshall|first8=M. H.|last9=Brauer|first9=A.|last10=Lamb|first10=H. F.|last11=Payne|first11=R. L.|last12=Tarasov|first12=P. E.|last13=Haraguchi|first13=T.|last14=Gotanda|first14=K.|last15=Yonenobu|first15=H.|last16=Yokoyama|first16=Y.|last17=Tada|first17=R.|last18=Nakagawa|first18=T.|title=A Complete Terrestrial Radiocarbon Record for 11.2 to 52.8 kyr B.P.|journal=Science|volume=338|issue=6105|year=2012|pages=370–374|issn=0036-8075|doi=10.1126/science.1226660}}</ref> |
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. The error of this calibration is estimated to be 170 years in |
. The error of this calibration is estimated to be about 170 years in 50,000. From this precision, the data obtained from Lake Suigetsu is determined to be the world ''de facto'' standard of the radiocarbon dating for geological science in International Radiocarbon Conference held in UNESCO Headaquater in France on July 13, 2014<ref>[https://web.archive.org/web/20130626061901/http://www.hitachi-zaidan.org/kankyo/docdata/work04_18.pdf 第10回環境サイエンスカフェ 7万本の縞模様と70万粒の花粉-水月湖の土が語る気候変動7万年の歴史 P.12-P.21]（2013年6月26日時点の[[インターネットアーカイブ|アーカイブ]]） - 日立環境財団HP</ref><ref>[https://web.archive.org/web/20121023110137/http://news.mynavi.jp/articles/2012/10/22/14c_science/index.html 日本人の活躍で5万2800年前まで遡れる年代目盛りが完成 - Scienceが会見]（2012年10月23日時点の[[インターネットアーカイブ|アーカイブ]]） - マイナビニュース、2012年10月22日。</ref>. |
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This museum |
This museum introduces the research outcome on the varve in Lake Suigetsu. The 45 m-long varve embedded in [[epoxy]] and thin-sectioned is on display<ref name=ref1>[http://varve-museum.pref.fukui.lg.jp Official Webpage]</ref>. Other exhibition covers formation of varve in Lake Suigetsu, varves from the world, climate around Lake Suigetsu decoded from the varve, and other [[archeoclimatology|archeoclimatological]] findings. Some of exhibitions have [[QR code]] to read explanation. A [[Tablet computer|tablet]] will be useful. However, at this point, the explanation is given only in Japanese. |
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==Access== |
==Access== |
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Revision as of 06:47, 16 September 2018
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  Location of Fukui Prefectural Varve Museum  Fukui Prefectural Varve Museum (Japan) | |
| Location | 122-121-1 Torihama, Wakasa, Mikatakaminaka, Fukui Prefecture |
|---|---|
| Coordinates | 35°33′33″N 135°53′50″E / 35.559056°N 135.897278°E |
| Type | geological museum |
| Director | Kazuma Yamane |
| Website | http://varve-museum.pref.fukui.lg.jp |
Fukui Prefectural Varve Museum is an geological and archeological museum located in Wakasa, Mikatakaminaka District, Fukui Prefecture, Japan. It features varve ranging from now back to 70,000 years found at the bottom of Lake Suigetsu. The special chairman is Kazuma Yamane[1][2].
Main Exhibition
Lake Suigetsu, one of Five Lakes of Mikata, is located in Wakasa Town, Mikatakaminaka District, Fukui Prefecture. It is a brackish water lake, with an area of 4.06 km², a perimeter of 9.85km, and the maximum depth of 38.0, making it largest among the five. It lacks directly inflowing river, which can disturb the precipitate on the lake bottom. Because of this, the sediments annually form varve and then remain undisturbed. In addition, the lack of oxygen in the water the lake bottom make it inhabitable to lifeforms which also helped to keep the varve undisturbed. Also, because of the fault running nearby, the lake gradually lowers its altitude and never filled up with sediments. With these serendipitous conditions combined, the varve found in the Lake Suigetsu is now known as “Miraculous Sediments”.
The investigation of Lake Suigetsu was started on 1991. In boring expedition on 2006, it was not possible to recover 70 m depth varve as one continuous core. Therefore the boring was conducted from 4 different spots, each 1 m core at a time. By matching varve patterns between the core samples, a 70 m-long varve was reconstituted. This equals to a 160,000 year-long varve without any discontinuity and named SG06 (from Suigetsu, 2006). A team of international collaboration members, Japan, UK, and Germany measured the ratio between a radiocarbon 14C and a stable isotope 12C throughout the layers of varve and obtained calibration data of radiocarbon dating 11,200 – 52,800 years ago. This result was published in Science[3] . The error of this calibration is estimated to be about 170 years in 50,000. From this precision, the data obtained from Lake Suigetsu is determined to be the world de facto standard of the radiocarbon dating for geological science in International Radiocarbon Conference held in UNESCO Headaquater in France on July 13, 2014[4][5].
This museum introduces the research outcome on the varve in Lake Suigetsu. The 45 m-long varve embedded in epoxy and thin-sectioned is on display[1]. Other exhibition covers formation of varve in Lake Suigetsu, varves from the world, climate around Lake Suigetsu decoded from the varve, and other archeoclimatological findings. Some of exhibitions have QR code to read explanation. A tablet will be useful. However, at this point, the explanation is given only in Japanese.
Access
About a 20–25 minute walk from Mikata Station of JR Obama Line.
Facilities Nearby
Located within Jomon Roman Park, near Lake Mikata, at the mouth of Hasu river. Also located in the park are, Wakasa Mikata Jomon Museum, Jomon Colosseum, Roadside station "Michino Eki, Five Lakes of Mikata" and Fukui Prefectural Satoyama-Satoumi Research Institute.
Open date
Closed on Tuesday (except on holidays, in which case it is closed on Wednesday) and at the end and beginning of the year.
References
- ^ a b Official Webpage
- ^ 日経ビジネスオンライン
- ^ Bronk Ramsey, C.; Staff, R. A.; Bryant, C. L.; Brock, F.; Kitagawa, H.; van der Plicht, J.; Schlolaut, G.; Marshall, M. H.; Brauer, A.; Lamb, H. F.; Payne, R. L.; Tarasov, P. E.; Haraguchi, T.; Gotanda, K.; Yonenobu, H.; Yokoyama, Y.; Tada, R.; Nakagawa, T. (2012). "A Complete Terrestrial Radiocarbon Record for 11.2 to 52.8 kyr B.P.". Science. 338 (6105): 370–374. doi:10.1126/science.1226660. ISSN 0036-8075.
- ^ 第10回環境サイエンスカフェ 7万本の縞模様と70万粒の花粉-水月湖の土が語る気候変動7万年の歴史 P.12-P.21（2013年6月26日時点のアーカイブ） - 日立環境財団HP
- ^ 日本人の活躍で5万2800年前まで遡れる年代目盛りが完成 - Scienceが会見（2012年10月23日時点のアーカイブ） - マイナビニュース、2012年10月22日。