Peter W. Haines

Did the Delamerian Orogeny start in the Neoproterozoic

Recent studies generally have inferred that the onset of convergence in the Delamerian Orogeny in southeastern Australia commenced at the end of the Early Cambrian (∼514 Ma) after the deposition of Kanmantoo Group sediments. Correlative sequences in Antarctica provide evidence that convergent deformation (Ross Orogeny) commenced between 580 and 540 Ma, leading to the interpretation that the locus of deformation migrated or jumped northward along the paleo‐Pacific margin of Gondwana. However, the absence of upper Neoproterozoic sequences in the southern Adelaide Rift Complex requires either significant pre‐Kanmantoo erosion (for which there is no evidence) or a depositional hiatus due to uplift. New Rb‐Sr data from solution cleavage in Brachina Formation sedimentary rocks at Hallett Cove, South Australia, date deformation at \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape

A new pteraspidomorph from the Nibil Formation (Katian, Late Ordovician) of the Canning Basin, Western Australia

554\pm 10

Uncovering the Canning Basin: a new comprehensive SEEBASE® model

\end{document} Ma, while 40Ar/39Ar data on white mica in the center of the cleavage yield a relatively flat plateau‐like segment with an age of \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape

Cycles of nutrient trace elements in the Phanerozoic ocean

533\pm 15

Changes of palaeoenvironmental conditions recorded in Late Devonian reef systems from the Canning Basin, Western Australia: A biomarker and stable isotope approach

\end{document} Ma. Additional evidence for a pre‐514‐Ma onset of deformation is provided by a \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape