Exhumation processes of the Sambagawa metamorphic rocks, as inferred from quartz microstructures and mineral radiometric ages
从石英微观结构和矿物辐射年龄推断三巴川变质岩的折返过程
基本信息
- 批准号:14340151
- 负责人:
- 金额:$ 6.21万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2002
- 资助国家:日本
- 起止时间:2002 至 2004
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The results obtained in this research have been summarized below.(1)We have set up an automated measurement system of c-axis orientation of deformed quartz, using a Zeiss petrographic microscope, digital camera and Macintosh personal computer. This was made possible by Prof.R.Heilbronner, who stayed at Hiroshima University for 1 month in 2003, and investigated a lot of microstructures in quartz schists from the Sambagawa belt, central Shikoku with this method. The results will be submitted for a special volume of Tectonophysics.(2)The boundary and difference in the nature of terrane between the Sambagawa and Northern Chichibu belt have not been clear. In this study, we have found that the Kiyomizu Tectonic Line is the boundary fault between the two tectonic belts, which are completely different in both lithology and geologic structure.(3)We have conducted detailed geological survey and microstructural analyses of deformed quartz schist. As a result, it has become clear that an extensive folding and faulting occurred, and existing well-defined quartz c-axis fabrics were destroyed by solution-reprecipitation of quartz assisted by micro-faulting during the final exhumation stages under low temperatures in this area.(4)I hired Dr.N.Shigematsu as a research associate for three month in 2004. He was engaged in deformation experiments of K-feldspar single crystals, using a modified Griggs apparatus installed at Hiroshima University. We have found that K-feldspar single crystals deformed by mechanical twinning and intracrystalline slip, but also sometimes failed by faulting at the physical conditions (T=800゜C, strain rate=10^<-5>/s), suggesting that the experimental conditions can be correlated with those of the brittle-ductile transition. Also, these experimental conditions can be correlated with the temperature conditions of ca.400゜C at natural strain rate, which interprets that feldspars start to plastically deform around these temperatures in nature.
本研究取得的成果总结如下:(1)利用蔡司岩相显微镜、数码相机和Macintosh个人电脑,建立了变形石英c轴取向自动测量系统。 2003年,R.Heilbronner教授在广岛大学停留了1个月,用这种方法研究了四国中部三波川带石英片岩的大量微观结构,使这一成果成为可能。研究结果将提交给构造物理学专卷。(2)三波川带和北秩父带地体性质的界限和差异尚不明确。本研究发现清水构造线是两条构造带之间的边界断层,这两条构造带的岩性和地质结构都完全不同。(3)对变形石英片岩进行了详细的地质调查和微观结构分析。结果表明,在该地区低温下的最终折返阶段,发生了广泛的折叠和断层,并且在微断层辅助下的石英溶液再沉淀作用下,现有的清晰石英c轴织物被破坏。(4)我于2004年聘请N.Shigematsu博士为研究员三个月。他从事 钾长石单晶,使用广岛大学安装的改良格里格斯装置。我们发现钾长石单晶会因机械孪晶和晶内滑移而变形,但有时也会在物理条件(T=800゜C,应变速率=10^<-5>/s)下因断层而失效,这表明实验条件可以与脆塑转变的条件相关。此外,这些实验条件可以与自然应变率下约 400゜C 的温度条件相关,这解释了长石在自然界中在这些温度附近开始塑性变形。
项目成果
期刊论文数量(50)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Normal faulting during exhumation of the Sambagawa metamorphic rocks, central Shikoku, Japan (in Japanese)
日本四国中部三波川变质岩折返过程中的正常断层(日语)
- DOI:
- 发表时间:2003
- 期刊:
- 影响因子:0
- 作者:Takeshita;T.
- 通讯作者:T.
Metamorphic evolution of the SW Okcheon metamorphic belt in South Korea and its regional implications
韩国沃川西南变质带的变质演化及其区域意义
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:Kim;S.V.
- 通讯作者:S.V.
Miyashita, A.: "K-Arage and chemistry of phengite from the sanbagawa schists in the Kanto Mountains, central Japan, and their implication for exhumation tectonics"Gondwana Reserch. 5・4. 837-848 (2002)
Miyashita, A.:“日本中部关东山脉三波川片岩的 K-Arage 和化学及其对折返构造的意义”Gondwana Research 5・4 (2002)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Flow kinematics in the deeper part of a subduction channel, as inferred from inclusion trails in plagioclase porphyroblasts from the Sambagawa metamorphic rocks
从桑巴川变质岩斜长石斑岩中的包裹体轨迹推断出俯冲通道深处的流动运动学
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:Takeshita;T.
- 通讯作者:T.
Toru Takeshita: "Flow patterns during exhumation of the Sambagawa metamorphic rocks, southwest Japan, caused by brittle-ductile, arc-parallel extension"Geological Society, London, Special Publications. (In press). (2004)
Toru Takeshita:“日本西南部三波川变质岩折返期间的流动模式,由脆性-韧性、弧形平行延伸引起”地质学会,伦敦,特别出版物。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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TAKESHITA Toru其他文献
TAKESHITA Toru的其他文献
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{{ truncateString('TAKESHITA Toru', 18)}}的其他基金
Structure of oral indigenous microbiota for evaluation of oral health
用于评估口腔健康的口腔本土微生物群结构
- 批准号:
23792517 - 财政年份:2011
- 资助金额:
$ 6.21万 - 项目类别:
Grant-in-Aid for Young Scientists (B)
Effect of periodontal treatment on oral indigenous microbiota
牙周治疗对口腔原生微生物群的影响
- 批准号:
21890187 - 财政年份:2009
- 资助金额:
$ 6.21万 - 项目类别:
Grant-in-Aid for Research Activity Start-up
Analysis of formation conditions for microcracking with fluid inclusions
流体包裹体微裂隙形成条件分析
- 批准号:
04452077 - 财政年份:1992
- 资助金额:
$ 6.21万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)