collisional tectonics of microcontinents derived from the northern parts of Gondwaqna in Thailand and Laos

泰国和老挝冈瓦克纳北部地区微大陆的碰撞构造

• 批准号: 15403013
• 负责人: HISADA Ken-ichiro
• 金额: $ 7.3万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15403013/
• 关键词: suture line; serpentinite; ophiolite; ammonoid; chert; Thailand; Lao; Indochina; シブマス; 縫合断層; 石灰岩; フズリナ

The purpose of this study is mainly to elucidate of tectonics and paleogeography at the time of collision between Sibumasu, a part of Cimmerian continent, and Indochina united with South China block. We carried out ten times field trips in Thailand and Laos during three years. As results, the following are clarified ;The northern extension of the Nan-Uttradit Suture (formerly interpreted as a suture between Sibumasu and Indochina) was examined and newly inferred. This suture does not extend into Laos, and probably turns northward around the national border. Otherwise, this suture may be ended north of Nan city in Thailand. Secondly, it is proved that the Loei Suture is not a suture, but corresponds to ophiolite. Namely, the north extending distribution of serpnetinite, basalt and chert, from east to west, was confirmed. Thirdly, the structural difference, that is, slate belt on the western side and thrust and fold belt on the eastern as a border of the Mae Hong Son fault is recognized. Fourthly, the new interpretation concerning the sedimentary environment of chert was obtained. The knowledge that chert was deposited in deep sea as pelagic sediments has been widely accepted, but this study proves that chert sedimentation on Sibumasu was rather deposited in shallower environments.

本研究的目的主要是阐明西梅里安大陆的一部分锡布马苏与与华南地块结合的印度支那碰撞时的构造和古地理。三年间，我们对泰国和老挝进行了十次实地考察。结果，澄清了以下内容：对 Nan-Uttradit 缝合线（以前被解释为 Sibumasu 和印度支那之间的缝合线）的北部延伸进行了检查和新推断。这条缝合线没有延伸到老挝，并且可能绕着国家边界向北转向。否则，这条缝合线可能会在泰国南城以北结束。其次，证明黎府缝合线不是一条缝合线，而是对应于蛇绿岩。即确认了蛇纹岩、玄武岩和燧石自东向西向北延伸分布。第三，认识到构造差异，即西侧板岩带和东侧逆冲褶皱带作为湄宏顺断层的边界。第四，对燧石沉积环境有了新的解释。燧石作为远洋沉积物沉积在深海的知识已被广泛接受，但这项研究证明，斯布马苏的燧石沉积物实际上是在较浅的环境中沉积的。

项目成果

日本地質学会第111年学術大会見学旅行案内書

日本地质学会第111届年会参观指南

• 发表时间: 2004
• 作者: 原英俊;柏木健司;久田健一郎 他
• 通讯作者: 久田健一郎 他

新潟県黒又川周辺地域に分布する足尾帯

足尾带分布于新泻县黑俣川地区

• 发表时间: 2004
• 期刊: 地質学雑誌 110
• 作者: 原英俊;柏木健司
• 通讯作者: 柏木健司

Role of dunite in genesis of primitive MORB

纯橄榄岩在原始 MORB 成因中的作用

• 发表时间: 2005
• 期刊: Proceedings of Japan Academy, Ser.B 81
• 作者: Arai;S.
• 通讯作者: S.

Sequence boundary and related sedimentary

层序边界及相关沉积

• 发表时间: 2004
• 期刊: Facies 50(2)
• 作者: Nakazawa;T.;Ueno;K
• 通讯作者: K

Hisada, K., Sugiyama, M.: "Missing ophiolitic rocks along the Mae Yuan Fault"The Island Arc. 13・1. 119-127 (2004)

Hisada, K., Sugiyama, M.：“沿着 Mae Yuan 断层失踪的蛇绿岩”The Island Arc 119-127 (2004)。