In July, 1949, the Bureau of Mineral Resources, Geology and Geophysics began an investigation of the geology and mineral resources of the Harts Range Region, Central Australia, an area of about 2,000 square miles between Latitudes 23° 00' south and 23° 30' south, and Longitudes 12:3° 45' east and 135° 30' east. The undertaking was prompted by the discovery of small amounts of radioactive minerals in pegmatites in the eastern portion of the range. It was soon realized that the deposits of radioactive minerals were not of economic size, and the investigation was therefore extended to other mineral deposits, and in particular to the mica deposits of the Harts Range and Plenty River.he Harts Range and Plenty River Mica Field is the most. Important in Australia, and had yielded 859.49 tons of commercial muscovite .valued at £692,794 to the end of 1952. The investigation of the field was carried out in field seasons between July, 1949, and October, 1951. The mica-bearing pegmatites occur in the rocks of the Harts Range Group, a complex of metamorphosed igneous and sedimentary rocks probably of Archaeozoic age.

This report deals with the volcanic activity at Tuluman Volcano in St .Andrew Strait, 25 miles south of Lorengau in the Admiralty group. In the first of the three papers, which constitute the report, a description is given of the activity from June 1953, when the eruption began, to the end of July-1954. Part II describes further submarine activity in October and November 1954, and the condition of the active centres at that time. In Part III a more detailed description of the eruptive activity is given and the eruption and the associated phenomena are reviewed at some length. Volcanic activity in the St. Andrew Strait has originated from at least five, separate centres, from one of which another cone has been formed by a branching-off from the main conduit. As a result, three islands, two of which have been subsequently joined, have been built up above sea level. The name Tuluman Islands is proposed for these islands, and individual cones are numbered according to the chronological order in which they have been formed. The geographical position of the Tuluman Islands and their topography are also discussed.

A report of apparent volcanic activity in the vicinity of Long Island.

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These documents have been scanned by the GA Library. Please refer to the document for contents.

These documents have been scanned by the GA Library. Please refer to the document for contents.

These documents have been scanned by the GA Library. Please refer to the document for contents.

These documents have been scanned by the GA Library. Please refer to the document for contents.

Legacy product - no abstract available

Legacy product - no abstract available