Mount Marumba, Northern Territory, SD 53-6, 1:250 000 geological map series explanatory notes (2nd edition)  


Authors / CoAuthors

Sweet, I.P. | Brakel, A.T. | Rawlings, D.J. | Haines, P.W. | Plumb, K.A. | Wygralak, A.S.

Abstract

Mount Marumba covers the central part of Arnhem Land, which is occupied mainly by the Katherine River, Mount Rigg and Roper Groups of the Palaeoproterozoic to Mesoproterozoic McArthur Basin succession. These units consist of marine and non-marine clastics, carbonates, and lesser volcanics, that are extensively intruded by dolerite and some microgranite. Recent mapping and associated structural, geophysical, geochemical and geochronological studies have resulted in a number of important new findings: (1) The Jimbu Microgranite intruded the Katherine River Group at ~1710 Ma, causing updoming of surrounding sediments to form a number of structural domes. (2) An age of 1324 Ma has been obtained from the Derim Derim Dolerite, intruding the Roper Group, that provides improved constraints on the ages of sedimentation and deformation. (3) An aeolian facies has been recognised within the Gundy Sandstone. (4) The former Kombolgie Formation has been elevated to a Subgroup, subdivded into component formations, and extended upwards to include the McKay Sandstone. (5) A major impact structure, the Gulpuliyul Structure, was formed between ~1600 and 1324 Ma.The mapping and interpretation took advantage of the full complement of regional gravity, airborne magnetic and gamma-ray spectometric datasets now available. Concealed dykes, lineaments and sill edges are overprinted on the surface geology in magenta. In addition, the map features 1:1 000 000-scale marginal figures of an enhanced total magnetic intensity image and a gamma-ray spectroscopy image. Two cross-sections highlight the salient features of the stratigraphy and structure. The 84-page Explanatory Notes presents descriptions of the geology in some detail, in sections on the regional geological setting, stratigraphy, geophysics, structure, geological history and economic geology. The text is supported by several tables and numerous black-and-white photographs and line drawings, as well as some full-colour images.

Product Type

nonGeographicDataset

eCat Id

31131

Contact for the resource

  Custodian

MNHD  

  Point of contact

Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

Keywords

  • GA PublicationExplanatory Notes
( Theme )
  • cartography
( Theme )
  • economic geology
( Theme )
  • geology
( Theme )
  • geochronology
( Theme )
  • geophysics
( Theme )
  • structural geology
( Theme )
  • lithostratigraphy
( Theme )
  • gamma spectroscopy
( Theme )
  • magnetics
( Theme )
  • TMI
  • AU-NT
Australian and New Zealand Standard Research Classification (ANZSRC)
  • Earth Sciences
  • Published_Internal

Publication Date

1999-01-01T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - restricted

Use - license

Status

Purpose

Maintenance Information

unknown

Topic Category

geoscientificInformation

Series Information

SD53-6

Lineage

Unknown

Parent Information

Extents

[-14.0, -13.0, 133.5, 135.0]

Reference System

Spatial Resolution

Service Information

Associations

Downloads and Links

Source Information

Source data not available.