STUDY OF GEOLOGIC CORRELATION BETWEEN SRI LANKA AND ANTARCTICA

斯里兰卡与南极洲地质相关性研究

• 批准号: 63041031
• 负责人: HIROI Yoshikuni
• 金额: $ 9.86万
• 依托单位: CHIBA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Overseas Scientific Survey.
• 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-63041031/
• 关键词: Gondwanaland; Regional metamorphism; Kyanite; Andalusite; Syowa Station; Sapphire; Spinel; 部分溶融

In the Precambrian high-grade metamophic rocks from Sri Lanka, one of the Gondwana fragments, have been revealed several geochronological, petrological and mineralogical features in common to those of the high-grade metamorphic rocks around Syowa Station, East Antarctica. First, the Sri Lankan rocks suffered main regional metamorphism ca. 1100 Ma, and were remetamorphosed locally ca. 500 Ma when granitic rocks were emplaced. Secondaly, relict kyanite was found to occur in rocks of both the Highland Series and the Southwestern Group, suggesting initial relatively high-pressure and low-temperature conditions of metamorphism. In addition, secondary andalusite was found to occur not only in the Southwestern Group rocks but also in the Highland Series rocks. These facts show that both the Highland Series and the Southwestern Group have experienced similar pressure-temperature evolution, thoug the later low-pressure metamorphic overprinting was much more extensive in the Southwestern Group than in the Highland Series. Thirdly, supphire and spinel, important gems of Sri Lanka, was established to occur in dolomitic marbles.

冈瓦纳大陆残片之一的斯里兰卡前寒武纪高级变质岩，具有与东南极雪瓦站周围高级变质岩相同的年代学、岩石学和矿物学特征。第一，斯里兰卡岩石遭受了主要的区域变质作用。1100 Ma，局部再变质。500 Ma花岗岩侵位。其次，在高地岩系和西南岩群的岩石中都发现了残留蓝晶石，表明变质作用的初始条件是相对高压和低温。此外，还发现次生红柱石不仅出现在西南群岩石中，而且也出现在高地系列岩石中。这些事实表明，高地系和西南群都经历了类似的压力-温度演化，尽管西南群后期低压变质叠加比高地系要广泛得多。第三，斯里兰卡的重要宝石，蓝宝石和尖晶石，被确定出现在花岗岩大理石中。

项目成果

Masaru YOSHIDA: "SCHISTOSITY AND LINEATION OF A YOUNGER GENERATION OCCURRING IN THE HIGHLAND GROUP OF SOUTHWEST KANDY, SRI LANKA" JOURNAL OF THE GEOLOGICAL SOCIETY OF SRI LANKA. (1990)

Masaru YOSHIDA：“斯里兰卡康提西南部高地群发生的年轻一代的页岩性和线理”斯里兰卡地质学会杂志。

Yoshikuni HIROI: "ARRESTED CHARNOCKITE FORMATION IN SRI LANKA: FIELD AND PETROGRAPHIC EVIDENCE FOR LOW-PRESSURE CONDITIONS" PROCEEDINGS OF THE NIPR SYMPOSIUM ON ANTARCTIC GEOSCIENCES. 4. (1990)

HIROI Yoshikuni HIROI：“斯里兰卡捕获的镁钾长岩形成：低压条件的现场和岩相证据”NIPR 南极地球科学研讨会论文集。

廣井美邦: "南極の石は何を語るか" 科学. 59. 418-423 (1990)

Mikuni Hiroi：“南极洲的石头告诉我们什么？” 59. 418-423 (1990)

Yoshikuni Hiroi: "Arrested charnockite formation in Sri Lanka:Field and petrographical evidence for low-pressure conditions" Proceeding of the NIPR Symposium on Antarctic Geosciences. 4. (1990)

Yoshikuni Hiroi：“斯里兰卡捕获的镁辉石形成：低压条件下的现场和岩相证据”NIPR 南极地球科学研讨会论文集。

Hiroo Kagami: "Preliminary geochronological study of Sri Lankan rocks" 質量,分析. (1990)

Hiroo Kagami：“斯里兰卡岩石的初步地质年代学研究”Mass，分析（1990）。