Tertiary coal geology and stratigraphy of the Port Phillip Basin, Victoria

被引:13
|
作者
Holdgate, GR [1 ]
Gallagher, SJ [1 ]
Wallace, MW [1 ]
机构
[1] Univ Melbourne, Dept Earth Sci, Parkville, Vic 3010, Australia
关键词
brown coal; depositional environment; Port Phillip Basin; stratigraphy; Werribee Formation; Yaloak Formation;
D O I
10.1046/j.1440-0952.2002.00930.x
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Results from coal-exploration drilling in the onshore part of the Port Phillip Basin, Victoria, have established stratigraphic and age correlations of the Lower Miocene Werribee Formation brown coal deposits at Bacchus Marsh to similar brown coals at Altona. The coal deposits occur in a northwest-southeast structural depression (the Parwan Trough) that appears to be a southeast continuation of the Ballan Graben. Recent drilling for potential coal-bed methane in the trough has provided new data on the deeper stratigraphy not penetrated by earlier drilling, including recognition of an Upper Cretaceous to Eocene Yaloak Formation coal-bearing interval, similar to the Anglesea area, Ballan Graben and Lai Lal Basin. Up to 200 m of coal-bearing sediment and minor volcanics underlie the Miocene coal measures. A marine facies transition takes place between the Miocene coal swamps of the Parwan Trough, through barrier sands west of Werribee, to carbonate facies near Geelong. To the south beneath Port Phillip Bay, a similar transition probably occurs between coal swamps of the Parwan Trough and fully marine carbonate environments of the contiguous Sorrento Graben. The palaeogeographical reconstructions suggest a similar coal-to-carbonate facies transition as in the adjacent onshore Gippsland Basin.
引用
收藏
页码:437 / 453
页数:17
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