High-precision dating of significant geologic phenomena in Post-Glacial age

后冰河时代重要地质现象的高精度测年

• 批准号: 09680177
• 负责人: OKUMURA Koji
• 金额: $ 2.3万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09680177/
• 关键词: Post-Glacial Age; Radiocarbon dating; Dendrochronology; Tephra; Mass movement; Paleoseismology; Tree-ring; Quaternary; 補正時代

In order to develop and popularize high-precision dating of significant geologic phenomena of the Post-Glacial age, we introduced a composite techniques of high-precision radiocarbon dating and relative dendrochronology. The first successful dating by wiggle matching, which gives better constraints on probabilty distribution of dendrocorrected radiocarbon age, was carried out for samples related with large mass-movment events and volcanic eruptions. For example, the age of the Kawago-daira tephra formarly dated as 2800 to 3300 yearsBP was precisely determined as 3120 Cal. years BP with a huge trunk sample of over 400 rings, 5 high-precision conventional dating with definite intervals of 75 to 100 years, and wiggle matching. For the relative dendrochronological analyses, we introduced very high resolution imaging of polished tree rings with 10000 dpi flatbed scanner. Scanned tree ring images are retouched and enlarged to make recognition and counting of the rings. This method of electronic tree ring analysis will improve the representability of tree-ring studies. On the other hand, recognition and dating techniques for paleo-earthquakes are refined through detailed analyses of lake deposits for chemical and physical signatures of faulting events that affected the lake environment. Once the horizon of disturbance is recognized, usual procedures for high-precision dating were., successfully applied. The investigators are propagating to the Japanese geologist the idea of high-precision dating and refinment of the dates for the advancement of precise chronology for all related sciences.

为了开发和普及在冰川后时代的重要地质现象的高精度约会，我们引入了高精度放射性碳年代和相对树状人工学的复合技术。第一个成功的匹配日期成功约会，对与大型质量运动事件和火山喷发相关的样品进行了更好的树状校正放射性碳年龄的概率分布的限制。例如，Kawago-daira Tephra的年龄恰好确定为2800至3300年BP的年龄被确切地确定为3120 Cal。 BP年的巨大树干样品，有400多个环，5个高精度的常规约会，确定的间隔为75至100年，并且搭配匹配。对于相对的DendroCological分析，我们用10000 DPI平板扫描仪引入了非常高的抛光树环的分辨率成像。扫描的树环图像进行了修饰和扩大，以识别和计数环。这种电子树环分析方法将提高树环研究的可代表性。另一方面，通过对影响湖泊环境的故障事件的化学和物理特征的湖泊沉积物进行了详细分析，可以对古Quage Quains的识别和约会技术进行完善。一旦确认了干扰的视野，就可以成功地应用高精度约会的常规程序。调查人员正在向日本地质学家传播高精度约会和日期的思想，以提高所有相关科学的精确年表。

项目成果

Okuno M., Moriya I., Tanaka K.and Nakamura, T.: "6500 cal yr BP Eruption of Takahara Volcano, North Kanto, Central Japan." Kazan, Bull.Volcano.Soc.Japan.42. 393-402 (1997)

Okuno M.、Moriya I.、Tanaka K. 和 Nakamura, T.：“距今 6500 年，日本中部北关东高原火山喷发。”

Okuno, M., Nakamura, T., Moriwaki, H.and Kobayashi, T.: "AMS radiocarbon dating of the Sakurajima tephra group, southern Kyushu, Japan." Nuclear Instruments and Methods in Physics Research. B123. 470-474 (1997)

Okuno, M.、Nakamura, T.、Moriwaki, H. 和 Kobayashi, T.：“日本九州南部樱岛火山灰群的 AMS 放射性碳测年”。

D.P.Schwartz, D.Pantosti, K.Okumura, T.J.Powers, and J.C.Hamilton: "Paleoseismic investigations in the Santa Cruz mountains, California : Implications for recurrence of large-magnitude earthquakes on the San Andreas fault." Jour.Geophys.Res.103. 17985-180

D.P.Schwartz、D.Pantosti、K.Okumura、T.J.Powers 和 J.C.Hamilton：“加利福尼亚州圣克鲁斯山脉的古地震调查：对圣安德烈亚斯断层再次发生大规模地震的影响。”

鈴木毅彦・藤原 治・檀原 徹: "関東北部から東北南部に分布する第四紀テフラのフィッション・トラック年代" 第四紀研究. 37印刷中. (1998)

Takehiko Suzuki、Osamu Fujiwara 和 Toru Danhara：“从关东北部到东北南部分布的第四纪火山灰的裂变径迹年龄”，第四纪研究，37 版（1998 年）。

Okuno, M., Nakamura, T., Kamata H., Ono K.and Hoshizumi H.: "AMS 14C age of the Handa Pyroclastic-Flow Deposit from Kuju Volcano, Japan." Kazan, Bull.Volcano.Soc.Japan. 43. 75-79 (1998)

Okuno, M.、Nakamura, T.、Kamata H.、Ono K. 和 Hoshizumi H.：“日本九重火山半田火山碎屑流沉积物的 AMS 14C 年龄。”