Clay mineralogical, geochemical and isotopic tracing of the evolution of the Woodleigh impact structure, Southern Carnarvon Basin, Western Australia

Uysal, I. Tonguc, Mory, Arthur J., Golding, Suzanne D., Bolhar, Robert and Collerson, Kenneth D. (2005) Clay mineralogical, geochemical and isotopic tracing of the evolution of the Woodleigh impact structure, Southern Carnarvon Basin, Western Australia. Contributions To Mineralogy And Petrology, 149 5: 576-590. doi:10.1007/s00410-005-0665-8


Author Uysal, I. Tonguc
Mory, Arthur J.
Golding, Suzanne D.
Bolhar, Robert
Collerson, Kenneth D.
Title Clay mineralogical, geochemical and isotopic tracing of the evolution of the Woodleigh impact structure, Southern Carnarvon Basin, Western Australia
Journal name Contributions To Mineralogy And Petrology   Check publisher's open access policy
ISSN 0010-7999
1432-0967
Publication date 2005
Sub-type Article (original research)
DOI 10.1007/s00410-005-0665-8
Volume 149
Issue 5
Start page 576
End page 590
Total pages 15
Place of publication New York, USA
Publisher Springer
Collection year 2005
Language eng
Subject C1
260301 Geochronology and Isotope Geochemistry
780104 Earth sciences
Abstract Chaotically structured diamictite from the inner ring syncline surrounding the central uplift of the Woodleigh impact structure contains shocked metamorphic and impact melt-rock fragments, largely derived from Ordovician and Devonian target sandstones. Coarse illite fractions (< 2 mu m) from the sandstones containing no K-feldspar yield K-Ar ages of around 400 Ma, whereas the K-Ar ages of authigenic clays of > 0.2 mu m fractions from the diamictite without smectite and K-feldspar cluster around 360 Ma, consistent with Rb-Sr data. Crystallisation of newly formed illite in the impact melt rock clasts and recrystallisation of earlier formed illite in the sandstone clasts preserved in the diamictite, are attributed to impact-induced hydrothermal processes in the Late Devonian. The illitic clays from the diamictite and from the sandstones have very similar trace element compositions, with significantly enriched incompatible lithophile elements, which increase in concentrations correlatively with those of the compatible ferromagnesian elements. The unusual trace element associations in the clays may be due to the involvement of hot gravity-driven basinal fluids that interacted with rocks of the Precambrian craton to the east of the study area, or with such material transported and reworked in the studied sedimentary succession.
Keyword Geochemistry & Geophysics
Mineralogy
Induced Hydrothermal Activity
Authigenic Illite-smectite
Late Devonian Age
K-ar Evidence
Rb-sr
Gold Mineralization
Element
Phyllosilicates
Illitization
Crater
Q-Index Code C1

 
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