Abstract
Mafic and felsic rocks units of the Musgrave Province originally attributed to the c. 1075. Ma Giles Event of the greater Warakurna Large Igneous Province (LIP) are shown to be part of a complex sequence of magmatic and tectonic events punctuated over a span of at least 50. m.y. New geochronology and mapping resolve a sequence of at least 10 magmatic pulses with hiati of up to 10. m.y. consistent with a long-lived intracontinental rift setting. This rift, here named the Ngaanyatjarra Rift, features giant layered mafic-ultramafic Giles intrusions cut by a 10. km wide mafic-felsic magmatic shear zone. The latter is temporally related to the Warakurna LIP, however it is not clear that the Giles intrusions actually form part of the Warakurna LIP. Macroscopic folding and the formation of the large synmagmatic transpressional shear zone attest to synmagmatic basin inversion in the early stages of the rift. The extensive mafic to felsic volcanic rocks of the Tollu Group (traditionally grouped with the Giles Event) were emplaced 25-50. m.y. later than the c. 1075. Ma Warakurna LIP.
| Original language | English |
|---|---|
| Pages (from-to) | 572-588 |
| Number of pages | 17 |
| Journal | Precambrian Research |
| Volume | 183 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Dec 2010 |
| Externally published | Yes |
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Devil in the detail; The 1150-1000Ma magmatic and structural evolution of the Ngaanyatjarra Rift, west Musgrave Province, Central Australia. / Evins, Paul M.; Smithies, R. Hugh; Howard, Heather M.; Kirkland, Christopher L.; Wingate, Michael T D; Bodorkos, Simon.
In: Precambrian Research, Vol. 183, No. 3, 01.12.2010, p. 572-588.Research output: Contribution to journal › Article
TY - JOUR
T1 - Devil in the detail; The 1150-1000Ma magmatic and structural evolution of the Ngaanyatjarra Rift, west Musgrave Province, Central Australia
AU - Evins, Paul M.
AU - Smithies, R. Hugh
AU - Howard, Heather M.
AU - Kirkland, Christopher L.
AU - Wingate, Michael T D
AU - Bodorkos, Simon
PY - 2010/12/1
Y1 - 2010/12/1
N2 - Mafic and felsic rocks units of the Musgrave Province originally attributed to the c. 1075. Ma Giles Event of the greater Warakurna Large Igneous Province (LIP) are shown to be part of a complex sequence of magmatic and tectonic events punctuated over a span of at least 50. m.y. New geochronology and mapping resolve a sequence of at least 10 magmatic pulses with hiati of up to 10. m.y. consistent with a long-lived intracontinental rift setting. This rift, here named the Ngaanyatjarra Rift, features giant layered mafic-ultramafic Giles intrusions cut by a 10. km wide mafic-felsic magmatic shear zone. The latter is temporally related to the Warakurna LIP, however it is not clear that the Giles intrusions actually form part of the Warakurna LIP. Macroscopic folding and the formation of the large synmagmatic transpressional shear zone attest to synmagmatic basin inversion in the early stages of the rift. The extensive mafic to felsic volcanic rocks of the Tollu Group (traditionally grouped with the Giles Event) were emplaced 25-50. m.y. later than the c. 1075. Ma Warakurna LIP.
AB - Mafic and felsic rocks units of the Musgrave Province originally attributed to the c. 1075. Ma Giles Event of the greater Warakurna Large Igneous Province (LIP) are shown to be part of a complex sequence of magmatic and tectonic events punctuated over a span of at least 50. m.y. New geochronology and mapping resolve a sequence of at least 10 magmatic pulses with hiati of up to 10. m.y. consistent with a long-lived intracontinental rift setting. This rift, here named the Ngaanyatjarra Rift, features giant layered mafic-ultramafic Giles intrusions cut by a 10. km wide mafic-felsic magmatic shear zone. The latter is temporally related to the Warakurna LIP, however it is not clear that the Giles intrusions actually form part of the Warakurna LIP. Macroscopic folding and the formation of the large synmagmatic transpressional shear zone attest to synmagmatic basin inversion in the early stages of the rift. The extensive mafic to felsic volcanic rocks of the Tollu Group (traditionally grouped with the Giles Event) were emplaced 25-50. m.y. later than the c. 1075. Ma Warakurna LIP.
KW - Giles Event
KW - Intracontinental rift
KW - Layered intrusion
KW - Musgrave Province
KW - Warakurna Large Igneous Province
UR - http://www.scopus.com/inward/record.url?scp=78449297192&partnerID=8YFLogxK
U2 - 10.1016/j.precamres.2010.02.011
DO - 10.1016/j.precamres.2010.02.011
M3 - Article
VL - 183
SP - 572
EP - 588
JO - Precambrian Research
JF - Precambrian Research
SN - 0301-9268
IS - 3
ER -