Temporal development of the Atherton Basalt Province, North Queensland.

Whitehead, P.W., Stephenson, P.J., McDougall, I., Hopkins, M.S., Graham, A.W., Collerson, K.D. and Johnson, D.P. (2007) Temporal development of the Atherton Basalt Province, North Queensland.. Australian Journal of Earth Sciences, 54 5: 691-709. doi:10.1080/08120090701305236


Author Whitehead, P.W.
Stephenson, P.J.
McDougall, I.
Hopkins, M.S.
Graham, A.W.
Collerson, K.D.
Johnson, D.P.
Title Temporal development of the Atherton Basalt Province, North Queensland.
Journal name Australian Journal of Earth Sciences   Check publisher's open access policy
ISSN 1440-0952
0812-0099
Publication date 2007-07
Sub-type Article (original research)
DOI 10.1080/08120090701305236
Volume 54
Issue 5
Start page 691
End page 709
Total pages 19
Place of publication United Kingdom
Publisher Taylor & Francis Ltd
Collection year 2008
Language eng
Subject C1
780104 Earth sciences
04 Earth Sciences
Formatted abstract
The Atherton Basalt Province is centred on the Atherton Tableland, similar to 50 km southwest of Cairns in north Queensland. Forty-eight K-Ar age determinations and four U/Th analyses from these basalts provide information on the distribution of the volcanics over time. Volcanism commenced at 7.1 Ma and continued into the Early Holocene, with volumetric peaks in activity occurring 3.5-3 Ma and 2-1 Ma.
The province shows a change with time from eruptions of voluminous lava flows that built relatively large shield volcanoes, to the production of less voluminous lavas and pyroclastics associated with cinder cones during the last million years. Phreatomagmatic, maar-forming eruptions are also preserved among the most recent eruptions. Previous radiocarbon dating of swamp sediments suggested that volcanic activity may have occurred within the past 10 000 years.
No systematic change over time is apparent in the location of the volcanoes of the province, Rather, a source region similar to 80 km in diameter for the province as a whole has evolved over time. Extensive partial melting in the upper mantle may have led to the ascent and adiabatic melting of lesser volumes of mantle material from deeper levels.

Changes in lithospheric stresses in north Queensland, caused by the docking of the Ontong Java Plateau and subsequent development of northward subduction at the San Cristobal Trench, may have allowed the ascent of magma from this mantle region.
Keyword Atherton Basaslt Province
basalt
Cenozoic
potassium-argon dating
Queensland
uranium-thorium dating
volcanology
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Fri, 28 Mar 2008, 09:27:28 EST by Carolyn Marklew on behalf of School of Earth Sciences