Regolith-landform mapping, leucitite basalt and the landscape evolution of the Byrock region, NW NSW

Hugh Glanville, Ian Roach, Ken McQueen

    Research output: A Conference proceeding or a Chapter in BookConference contributionpeer-review


    The Byrock region is approximately 50 km NNE of Cobar in northwestern NSW. Valley-filling leucitite basalts (leucitites) occur northeast of Cobar, at El Capitan, and to the west of Byrock (Figure 1). The Byrock leucitites occupy an area of ca. 8 km2 . They occur as moderately weathered basaltic rises up to 35 m high in a low-relief area dissected by an ephemeral drainage system, including the north-trending Mulga Creek lying in the east of the mapping area. The Byrock leucitite is a part of the eastern Australian leucitite suite, which is a linear, age-progressive intraplate volcanic province that parallels the better known central volcanoes, which also form age progressive suites southward through eastern Australia. The leucitite province forms a line from Byrock in the north to Cosgrove, Victoria, in the south, which has been K-Ar dated from 16.8 Ma to 6 Ma (Sutherland 1983).
    The Byrock leucitite forms three main outcrops: Bye Hill, a lava mound of ca. 5 km2 and 35 m relief; and two much smaller disconnected outcrops forming low rises to the N and NE. Other small remnants of leucitite float (up to about 100 m2 ) have been iscovered during mapping traverses undertaken during the course of this research. The main outcrop of leucitite, Bye Hill, is cut through by a quarry on its western flank, allowing for cross-sectional examination and interpretation. The quarry faces are slightly to moderately weathered and it is difficult to interpret internal flow structures and to differentiate flow layers. Small pods of pink-coloured porcelainite, presumed to be explosively-incorporated lacustrine sediments, occur in the lower parts of the quarry faces, allowing some differentiation of flow boundaries.
    Original languageEnglish
    Title of host publicationAdvances in Regolith
    EditorsIC Roach
    Place of PublicationCanberra
    PublisherCRC LEME
    Number of pages5
    Publication statusPublished - 2003
    EventAdvances in Regolith - Canberra, Australia
    Duration: 1 Jan 2003 → …


    ConferenceAdvances in Regolith
    Period1/01/03 → …


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