南アフリカ共和国Witwatersrand盆地のシュードタキライト

DOI Web Site 被引用文献1件 参考文献103件
  • 久田 英子
    京都大学大学院理学研究科地球惑星科学専攻地質学鉱物学教室 Department of Geology, Rand Afrikaans University

書誌事項

タイトル別名
  • Review of Pseudotachylites in the Witwatersrand Basin, South Africa
  • ミナミアフリカ キョウワコク Witwatersrand ボンチ ノ シュードタキライト

この論文をさがす

抄録

The Vredefort Dome, located in the central part of the Witwatersrand Basin in South Africa, is the type locality for pseudotachylite. Pseudotachylite at the Vredefort Dome is generally regarded to be of impact origin. Pseudotachylites which are closely associated with faults are, however, also known to be common along the northern and northwestern edges of the Witwatersrand Basin. In order to compare pseudotachylites from the Vredefort Dome and from the surrounding Witwatersrand Basin, different studies were undertaken in the past. Mode of occurrence, microscopic textures, geochemical analyses and chronological measurements of pseudotachylites are briefly reviewed in this paper.<BR>In the Vredefrot Dome, pseudotachylites are commonly observed except in the central part of its core. In the surrounding Witwatersrand Basin, they are reported from drill core sections and in underground workings. The matrix in pseudotachylite from the Vredefort Dome is mostly a recrystallized melt phase, while those from the surrounding Witwatersrand Basin seem to be composed of clastic material. Pseudotachylites both from the Vredefort Dome and the surrounding Witwatersrand Basin are geochemically closely related to their host rocks. Although evidence for more than one generation of pseudotachylite has been presented, both in the Vredefort Dome and the surrounding Witwatersrand Basin, it is widely believed that most of them were formed as a result of the Vredefort impact event (ca. 2.0 Ga). Other fault rocks reported from the surrounding Witwatersrand Basin are older than the pseudotachylites and therefore not related to their formation.

収録刊行物

  • 地学雑誌

    地学雑誌 110 (1), 1-16, 2001

    公益社団法人 東京地学協会

被引用文献 (1)*注記

もっと見る

参考文献 (103)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ