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Studies on the structure and formation of the oldest fossil ice body in Japan

日本最古老冰体化石的结构和形成研究

基本信息

批准号：
63302016
负责人：
HIGUCHI Keiji
金额：
$ 5.18万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63302016/
关键词：
Fossil ice body ^<14>C dating Basal sediment Peri-glacial sediment Paleo-environment Ice flow Ice structure Snow patch 古環境岩屑運搬氷体年代雪渓研究 ^<14>C年代測定小氷期熱水ドリル

项目摘要

This research was two years project to study the fossil ice body of Kuranosuke Snow Patch in Japanese Northern Alps. In 1988, inner structure of the ice body was observed in vertical holes which penetrate to the bottom of the ice body with a depth of 19m. And many pieces of plants for ^<14>C dating, ice samples for physical and chemical analyses and basal sediment for analysis of dynamical process were collected from the hole.The age of this ice body was found to be 1700 - 1800 BP at the basal part, around 1000 BP at a height of 13m from the bottom and after 1960 above that. Distinct differences were found in the physical and chemical character of ice between the upper part and the lower part of the unconformable layer at a height of 13.2m from the bottom.Peri-glacial sediment studies and the samples analyses revealed that this area was warm and covered with alpine plants about 6000- 7000 BP,and after about 2000 BP, the ice body was formed under the climate colder than the present. After the formation of the ice body, much accumulation due to orographic effect protect the ice body from the surface melting, and also, the bottom melting was small due to cold ground temperature.Many evidences of ice flow were found, though the flow speed was small because the terminal moraine dammed up the ice movement. Therefore, this ice body was considered to be a glacier in the past. However, clear evidence of the present flow could not be found.

本研究是为期两年的日本北部阿尔卑斯山仓口雪地冰体化石研究项目。1988年，在垂直洞穴中观测到了冰体的内部结构，这些垂直洞穴贯穿冰体底部，深度为19m。在该冰洞中采集了大量的植物样品、物理化学分析冰样和分析动力学过程的基底沉积物，发现该冰体的年龄在底部1700-1800BP，距底部13m处约1000BP，在1960年以后。不整合层上部和下部冰的物理化学性质在距海底132m处有明显差异，冰周沉积物研究和样品分析表明，该地区气候温暖，覆盖高山植物约6000~7000 BP，约2000 BP后，冰体形成于比现在更冷的气候条件下。冰体形成后，由于地形效应的大量积累，冰体不受地表融化的影响，同时，由于地温较低，底部融化较小，虽然冰流速度较小，但由于冰川末端的冰川阻挡了冰层的运动，因此发现了许多冰流的证据。因此，这个冰体在过去被认为是冰川。然而，找不到目前资金流动的明确证据。