No abstract available

No abstract available

No abstract available

produced from a 250dpi scanned image of original out-of-print 1966 ed map Available as a product from NT Geological Survey or as a resource from GA Library

Milingimbi is situated in the northwest of the Arnhem Land Aboriginal Reserve. The map sheet extends from the northern coast and coastal plains, inland to low undulating country and spectacular escarpment plateau. Milingimbi lies at the northern extent of the McArthur Basin and includes parts of the Pine Creek Inlier in the northwest and the Arafura Basin in the north and east. The oldest rocks exposed are part of the Pine Creek Inlier, comprising Palaeoproterozoic (Orosirian) granite and gneiss of the Nimbuwah Complex. The Pine Creek Inlier was affected by a major tectonic event, the 1870-1850 Ma Barramundi Orogeny, which involved multiple fold generations, regional metamorphism and emplacement of the Nimbuwah Complex intrusives. These units form the basement to the Palaeoproterozoic to Mesoproterozoic McArthur Basin succesion. The oldest unit of the McArthur Basin is the Katherine River Group, which consists of fluviatile, shallow-marine, and minor aeolian units as well as volcanics. The extensive sheet-like sill of the Oenpelli Dolerite intruded at ~1688 Ma. Deposition of the Mt Rigg Group in a post-rifting sag basin extended across the Arnhem Shelf and Walker Trough to the east. The McArthur Basin underwent predominantly brittle deformation during the Proterozoic. 'Post-Nathan Shortening' involving west-northwest-east-southeast compression, resulted in north-northeast-directed thrusting, northeast- and northwest-trending conjugate faulting, and joint development. 'Post-Roper Extension' was characterised by east-west extension and emplacement of dolerite dykes at ~1324 Ma. 'Post-Roper Inversion' involved northeast-southwest compression reactivating northeast- and northwest-trending faults, north-directed thrusting and north-trending dextral strike-slip faulting. Undeformed, shallow-marine sediments of the Neoproterozoic to Middle Cambrian Arafura Basin unconformably overlie the McArthur Basin. A thin cover of Cretaceous shallow-marine sandstone and mudstone mantles the older rocks. Cainozoic alluvium, coastal deposits, laterite and soil cover a large proportion of Milingimbi. Exploration for uranium, bauxite and diamonds has been unsuccessful in locating economic prospects.

1st edition Available as a product from NT Geological Survey or as a resource from GA Library

No abstract available

No abstract available

1st edition Available from GSQ or as a GA Library resource

1st edition Available as a product from NT Geological Survey or as a resource from GA Library