Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Recent mantle degassing recorded by carbonic spring deposits along sinistral strike-slip faults, south-central Australia
Stockholm University, Faculty of Science, Department of Geological Sciences.
Show others and affiliations
Number of Authors: 7
2016 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 454, 304-318 p.Article in journal (Refereed) Published
Abstract [en]

The interior of the Australian continent shows evidence for late Quaternary to Recent fault-controlled mantle He-3 and CO2 degassing. A series of interconnected NW-striking sinistral faults, the Norwest fault zone (NFZ), in south-central Australia are associated with travertine mounds, the latter show a regular spacing of 50-70 km. U-series ages on 26 samples range from 354 +/- 7 to 1.19 +/- 0.02 ka (2 sigma errors) and suggest a clustering every similar to 3-4 ka since similar to 26 ka. Geochemical data demonstrate a remarkable mantle to-groundwater connection. Isotopic data indicate that the groundwater is circulating to depths >3 km and interacting with Neoproterozoic/Cambrian basement and mantle volatiles. He-3/He-4 isotope ratios show that the He comes in part from the mantle. This demonstrates that the NFZ cuts through the entire crust and provides pathways for mantle degassing. Scaling relationships suggest that the series of sinistral faults that make up the NFZ are interconnected at depths and have a significant strike length of 60-70 km or more. The NFZ occurs where a major compositional boundary and a significant heat flow anomaly occurs, and a major step in lithospheric thickness has been mapped. We discuss a tectonic model in which recent stress field, heat flow and lithospheric structure in central Australia reactivated a set of steeply dipping Neoproterozoic faults, which may now be growing into a crustal/lithospheric-scale structure.

Place, publisher, year, edition, pages
2016. Vol. 454, 304-318 p.
Keyword [en]
neotectonics, lithospheric structure, strike-slip fault, structural geology, geochemistry, Australia
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-136259DOI: 10.1016/j.epsl.2016.09.017ISI: 000386645700030OAI: oai:DiVA.org:su-136259DiVA: diva2:1052360
Available from: 2016-12-06 Created: 2016-12-01 Last updated: 2016-12-06Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Ring, Uwe
By organisation
Department of Geological Sciences
In the same journal
Earth and Planetary Science Letters
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 8 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf