The lower Devonian Kowmung volcaniclastics: A deep‐water succession of mass‐flow origin, northeastern Lachlan Fold Belt, N.S.W.
作者:
R. A. Cas,
C. McA. Powell,
C. L. Fergusson,
J. G. Jones,
W. D. Roots,
J. Fergusson,
期刊:
Journal of the Geological Society of Australia
(Taylor Available online 1981)
卷期:
Volume 28,
issue 3-4
页码: 271-288
ISSN:0016-7614
年代: 1981
DOI:10.1080/00167618108729166
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The Lower to ?Middle Devonian Kowmung Volcaniclastics form the upper part of a succession of Upper Siluran to mid‐Devonian flyschoid rocks in the Yerranderie area of N.S.W., and contain two major facies associations. (1) A mudstone facies association represents the ambient, background sedimentation, comprising predominantly buff mudstone that is host to an assemblage of coarser‐grained sediments, including graded‐bedded to massive siltstone, sandstone, conglomerate, allodapic limestone, and large allochthonous limestone blocks and associated limestone breccia. Bouma sequences are common, sole structures occur and maximum bed thickness is about 3 m. (2) A volcaniclastic facies association intrudes and interrupts the accumulation of the ambient mudstone facies association, and contains massive to partly graded, quartzofeldspathic siltstone, sandstone, breccia and conglomerate. Sedimentation units in the volcaniclastic facies association are up to 120 m thick. The two facies associations interfinger. Stratigraphically, the base of the Kowmung Volcaniclastics is taken as the first sedimentation unit of the volcaniclastic facies association. The mudstone facies association below this level is part of the Siluro‐Devonian Taralga Group.
点击下载:
PDF (2138KB)
返 回