タスマニア北西部産先カンブリア時代およびカンブリア紀のチャート

概要

論文の詳細を見る
The SEM study of the Precambrian and Cambrian cherts from northwestern Tasmania. Australia, discriminates three discrete morphological types in the constituting material. The first one, associated with the Smithton Dolomite in the Smithton Trough, consists of oval-shaped chitinozoan-like microorganisms. The second type, involved in the Barrington Chert of the Dial Range Trough, consists exclusively of unspecified microspherules, and the last from the Barrington Chert mainly of siliceous sponge spicules. The first and second types are possibly of Precambrian in age, and the last of Cambrian. The two types of the Barrington Chert occur as exotic boulders, blocks and rootless slabs within mudstone matrix in northwest coast. From the descrimination of chert constituents and mode of occurrence, it is concluded that a part of the Barrington Chert is allochthonous to the Cambrian argillaceous matrix.
国立科学博物館の論文
1988-06-22