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  • Contents: 1.Coutts DA, Wellman P, Barlow BC. Calibration of gravity meters with a quartz-mechanism. 2.Seidel GE. Application of the GABHYD groundwater model of the Great Artesian Basin, Australia. 3.Senior BR, Habermehl MA. Structure, hydrodynamics and hydrocarbon potential, central Eromanga Basin, Queensland, Australia. 4.Draper JJ. Rusophycus (Early Ordovician ichnofossil) from the Mithaka Formation, Georgina Basin. 5.Smith RS, McEwin AJ. Earthquake accelerograms and attenuation of seismic waves at Oolong, New South Wales. 6.Exon NF, Moreton D, Hicks G. Manganese nodules from the Tasman Sea off Sydney. 7.O'Connor DPH. Evidence of an exhalative origin for deposits of the Cobar district, New South Wales (comment). 8.Sangster DF. Evidence of an exhalative origin for deposits of the Cobar district, New South Wales (reply). 9.Rod E. Mode of emplacement of the Papuan Ultramafic Belt: a discussion. 10.Connelly JB. Mode of emplacement of the Papuan Ultramafic Belt: reply. 11.Habermehl MA. The Great Artesian Basin, Australia.

  • BMR journal of Australian geology & geophysics ; v. 6, no. 4. "Thematic issue" Contents: 1.Trudinger PA. Origins of sulphide in sediments. 2.Saxby JD. Organic matter in ancient ores and sediments. 3.Plimer IR. Water depth - a critical factor for exhalative ore deposits. 4.Philp RP. Diagenetic organic matter in Recent sediments and environments of deposition. 5.Bauld J. Geobiological role of cyanobacterial mats in sedimentary environments: production and preservation of organic matter. 6.Ferguson J, Burne RV. Interactions between saline redbed groundwaters and peritidal carbonates, Spencer Gulf, South Australia: significance for models of stratiform copper ore genesis.

  • A program of field tests of a new electromagnetic sounding technique was conducted in the Northern Territory. The tests were conducted to evaluate the operational features of the technique, and to determine its ability to provide useful depth information over localised conductive structures. The results are compared with earlier work which used an alternative electromagnetic sounding technique, and with drilling results. The tests demonstrated the operational and interpretive flexibility of the new technique. In particular they showed that the technique can be applied with normal, unmodified, electromagnetic prospecting equipment. The depth information which the new technique provided was in good agreement with control information.

  • Recordings of P seismic waves from a Novaya Zemlya nuclear explosion at 26 sites on the east Papuan peninsula show that there are significant apparent departures (residuals) from travel-times calculated using average earth models. The residual at Port Moresby (PMG) differs by between +0.3 and +0.5 seconds from previous attempts to assign a station effect there. Without precise times and locations of the Novaya Zemlya events it is not possible to determine the proportions of the residual due to source effects and velocity anomalies in the mantle. It is shown that complex crustal structure in the east Papuan region accounts for a significant proportion of the station residuals, which differ from the PMG residual by between -0.72 seconds and +1.41 seconds. There is a tendency towards more negative residuals on the northeast side of the Papuan peninsula.

  • It is suggested that the early and middle Proterozoic crustal record is inconsistent with, and cannot be explained on, an Earth of present-day dimensions (Glikson, in prep.). Stratigraphic, isotopic and geochemical data from terrains of the above age range in Australia, South Africa, Canada and other regions are diagnostic of intrasialic crustal environments - disclosing evidence neither for simatic crust nor for volcanic products of its partial fusion. The sima-tosial transformation processes which have dominated Archaean evolution (Engel, 1968; Viljoen and Viljoen, 1969; Glikson, 1970, 1972; Anhaeusser, 1973; Arth and Hanson, 1975) ceased by ca 2.6 aeons ago, and all available data indicate that both cratonic and mobile Proterozoic domains have, in the main, been founded on sialic basement. An extended tectonic hiatus existed between 2.6 and 2.0 aeons ago, and the onset of development of Proterozoic intrasialic mobile belts is thought to have essentially postdated the latter age.

  • The BMR Symposia are annual events stressing work relevant to industry. The Sixth Symposium was held in Canberra between 3 and 5 May 1977, and was officially opened by the Minister for Science, Senator the Hon. J.J. Webster. On 3 and 4 May, sessions were held at the Academy of Science Building. Talks presented, abstracts of which are given below, included results of completed projects, of work in progress, and some more general topics. A panel discussion, entitled What maps are needed now? was held on earth-science maps in Australia. The contributions of the members of the panel, and an edited version of the discussion, will be published in the December Issue of this Journal. An innovation this year was a one-day workshop, held at the Administration Building of CSIRO on 5 May 1977; the subject was the Pine Creek Geosyncline. Specific topics were discussed under broad headings of regional studies, uranium mineralization, and mapping and exploration techniques. 140 were present at the workshop, many of whom took part in discussion.

  • Two major information storage and retrieval systems now in operation at the Bureau of Mineral Resources - the Reference Minerals Collection Index and the Georgina Basin Project Data Base - are based on INFOL. The first system, used in progressively indexing mineral specimens in the BMR Museum, has been in operation 5 years and will continue indefinitely. The second system, designed for a specific field project, has been in operation for 4 years and has a finite life. The systems are run through CSIRONET on the Cyber 76 computer. INFOL (described in detail in CSIRO Division of Computing Research Manuals) is a generalised information storage and retrieval system designed to create, maintain, and interrogate a file of information. Basically, it is a free-field language which allows items of information of variable length to be written in plain English. It does not require the use of 80-column coding forms; data are stored in a compressed form - blank fields and non-significant blanks in the data do not take up storage space; complex search strategies are possible; and the report generators are flexible. Output may be obtained as a written report on visual display units, paper or microform, or as input for other computer applications. The major phases of an INFOL system are ESTABLISHMENT, INTERROGATION, UPDATE, and BOOKKEEPING. During the ESTABLISHMENT phase a file (i.e., a list) of elements (e.g., mineral specimens) consisting of a number of items (identification and descriptive information) is created. The file can then be interrogated or updated. Retrieval criteria can apply to items or sub-items - testing for the existence or non-existence of data, or testing relational criteria. The file may be updated by adding new elements; removing existing elements; adding, removing or changing items; or adding or changing sub-items. BOOKKEEPING occurs automatically at certain stages of INFOL operations. It gives information essential for specifying report formats.

  • The BMR Symposia are annual events, stressing work of relevance to industry. The Seventh Symposium was held in Canberra between 2 and 4 May 1978, and was opened by Mr A. J. Woods, Secretary of the Department of National Development, on behalf of the Hon. K. E. Newman, MP, Minister of the Department. Sessions were held at the Academy of Science Building on 2 and 3 May. Talks presented, abstracts of which are given below, included results of completed projects, of work in progress, and some more general topics. A panel discussion was held on Assessment of 1:100 000 scale geological mapping of Precambrian terrains in northern and central Australia. There were two informal workshops on 4 May: one of them, on Involvement of government organisations in geochemical surveys, was held at CSIRO Head Office; the second, held at BMR, was on the Georgina Basin.

  • BMR has decided that future issues in its Report series will be on microfiche. A hard-copy contents listing, and abstract, will accompany each Report. Summaries of the first microfiche Reports to be released are given below.