eCite Digital Repository

Characteristics, origin and significance of Mesoproterozoic bedded clastic facies at the Olympic Dam Cu-U-Au-Ag deposit, South Australia

Citation

McPhie, J and Orth, K and Kamenetsky, V and Kamenetsky, M and Ehrig, K, Characteristics, origin and significance of Mesoproterozoic bedded clastic facies at the Olympic Dam Cu-U-Au-Ag deposit, South Australia, Precambrian Research, 276 pp. 85-100. ISSN 0301-9268 (2016) [Refereed Article]

Copyright Statement

2016 Elsevier

DOI: doi:10.1016/j.precamres.2016.01.029

Abstract

Mesoproterozoic bedded clastic facies occur in the Olympic Dam Breccia Complex which hosts the Olympic Dam CuUAuAg deposit, South Australia. Contacts of the bedded clastic facies with breccia of the Olympic Dam Breccia Complex are faulted and/or brecciated; fragments of the bedded clastic facies occur in the breccia complex. The bedded clastic facies comprise five main facies associations, four of which are organised into mappable units. These associations have distinct textures and components and have not been mixed. Major sources of detritus were felsic and mafic volcanic units and granitoids of the ∼1590Ma Gawler Silicic Large Igneous Province. Archean and Paleoproterozoic zircons in well-sorted quartz-rich sandstone indicate that older Gawler Craton basement successions also contributed sediment to the bedded clastic facies. Accumulation of the bedded clastic facies was at least partly contemporaneous with rhyolitic explosive eruptions from vent(s) probably tens of km away because bubble-wall shards are present in tuffaceous mudstone facies. Deformation of the bedded clastic facies prior to final lithification produced folds that have diverse shapes and sizes, and that lack cleavage. The folds have a reasonably consistent gentle plunge to the northeast. These soft-sediment folds could be related to slumping on a northeast-striking paleoslope that dipped either to the northwest or southeast. The depocenter in which these facies accumulated may have been bounded by a combination of northeast-striking and northwest-striking faults. Because the bedded clastic facies occur at the top of the Olympic Dam Breccia Complex and contributed clasts to it, the fault-controlled sedimentary basin was in place when the breccia complex and the Olympic Dam ore deposit formed.

Item Details

Item Type:Refereed Article
Keywords:Olympic Dam, bedded clastic facies, provenance, pre-lithification fold, sedimentary basin, Mesoproterozoic
Research Division:Earth Sciences
Research Group:Geology
Research Field:Sedimentology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Mineral Exploration not elsewhere classified
Author:McPhie, J (Professor Jocelyn McPhie)
Author:Orth, K (Dr Karin Orth)
Author:Kamenetsky, V (Professor Vadim Kamenetsky)
Author:Kamenetsky, M (Dr Maya Kamenetsky)
ID Code:107933
Year Published:2016
Funding Support:Australian Research Council (LP130100438)
Web of Science® Times Cited:3
Deposited By:Earth Sciences
Deposited On:2016-03-31
Last Modified:2017-10-30
Downloads:0

Repository Staff Only: item control page