TY - JOUR
T1 - Delamerian Glenelg tectonic zone, Western Victoria
T2 - Geology and metamorphism of stratiform rocks
AU - Gray, C. M.
AU - Kemp, A. I.S.
AU - Anderson, J. A.C.
AU - Bushell, D. J.
AU - Ferguson, D. J.
AU - Fitzherbert, J.
AU - Stevenson, M. D.
PY - 2002/5/27
Y1 - 2002/5/27
N2 - The Cambro-Ordovician Glenelg tectonic zone of western Victoria is a distinctive metamorphicigneous segment of the Delamerian Orogenic Belt comprising two northwest-striking regional metamorphic segments of andalusite-sillimanite type prograding towards an axial granitic batholith. The second of five deformations (D2) was most significant, producing isoclinal folds, transposition and a pervasive regional foliation (S2). Southwest of the central batholith, biotite to migmatite zones contain mainly quartzo-feldspathic rock (turbiditic metagreywacke, quartzo-feldspathic schist and migmatite), plus less common metaquartzite and calc-silicate rocks and minor metapelite. Metagabbro, metadolerite and amphibolite typically have the chemistry of mid-ocean ridge basalts. Serpentinite pods and sheets were tectonically introduced to low-grade areas. Northeast of the central batholith, quartzo-feldspathic rock occupies the silimanite and migmatite zones exclusively, with a regional concentration of pegmatites adjacent to the zone boundary. Gross interleaving of quartzo-feldspathic schist, migmatite, pegmatite and muscovite-bearing granitic rock is characteristic. Peak metamorphic conditions of 550 MPa at 640°C leading to migmatite formation were established by D2 time and accompanied by tonalite-granodiorite and pegmatite emplacement. Subsequently, the thermal high contracted to the northeast culminating in the more extensive syn-, post-D4 to pre-D5 granitic magmatism.
AB - The Cambro-Ordovician Glenelg tectonic zone of western Victoria is a distinctive metamorphicigneous segment of the Delamerian Orogenic Belt comprising two northwest-striking regional metamorphic segments of andalusite-sillimanite type prograding towards an axial granitic batholith. The second of five deformations (D2) was most significant, producing isoclinal folds, transposition and a pervasive regional foliation (S2). Southwest of the central batholith, biotite to migmatite zones contain mainly quartzo-feldspathic rock (turbiditic metagreywacke, quartzo-feldspathic schist and migmatite), plus less common metaquartzite and calc-silicate rocks and minor metapelite. Metagabbro, metadolerite and amphibolite typically have the chemistry of mid-ocean ridge basalts. Serpentinite pods and sheets were tectonically introduced to low-grade areas. Northeast of the central batholith, quartzo-feldspathic rock occupies the silimanite and migmatite zones exclusively, with a regional concentration of pegmatites adjacent to the zone boundary. Gross interleaving of quartzo-feldspathic schist, migmatite, pegmatite and muscovite-bearing granitic rock is characteristic. Peak metamorphic conditions of 550 MPa at 640°C leading to migmatite formation were established by D2 time and accompanied by tonalite-granodiorite and pegmatite emplacement. Subsequently, the thermal high contracted to the northeast culminating in the more extensive syn-, post-D4 to pre-D5 granitic magmatism.
KW - Delamerian orogenic belt
KW - Glenelg tectonic zone
KW - Metamorphism
KW - Petrology
KW - Thermal history
KW - Victoria
UR - http://www.scopus.com/inward/record.url?scp=0036247398&partnerID=8YFLogxK
U2 - 10.1046/j.1440-0952.2002.00922.x
DO - 10.1046/j.1440-0952.2002.00922.x
M3 - Article
AN - SCOPUS:0036247398
SN - 0812-0099
VL - 49
SP - 187
EP - 200
JO - Australian Journal of Earth Sciences
JF - Australian Journal of Earth Sciences
IS - 2
ER -