92 The Lawlers Anticline and the Mt Margaret Anticline are located ...

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Figure 80. A synthesis of thetiming and deformation historypresented here in as comparedto Swager (1997).The Low-Ca granite type granites were emplaced following a switch in palaeostress back to NE–SW contraction (D5). These granites provide a maximum age for D5 as
Figure 81: Time event intensity history chart for the Eastern Yilgarn Craton. The chart comparesgranite ages (from Cassidy and Champion, 2002) and the Kalgoorlie stratigraphy (from Krapěz et al.,2000). Note the peak High-Ca type granite age of ~2673 Ma and the unconformity at the top of theBlack Flag Formation followed by the onset of coarse clastic sedimentation (White Flag Formation).Vectors of contraction and stylised intensity are shown in black arrows. Error bars for the ages of thecontractional events are shown (see text for details). Extensional events are dominantly ENEdirected,with local perturbations around individual domes. Published direct-dating of gold deposits(A-Wallaby: Salier et al., 2004; B-Sunrise Dam: Brown et al., 2002; C- Chalice: Bucci et al., 2004) arearound 2650 Ma. All occur within error at the switch from High-Ca type to Low-Ca type granites andduring a switch in contractional palaeostress from dominantly E-W (NE-SW) to NNW-SSE vectors(during D4).108
Page 1: The Lawlers Anticline and the Mt Ma
Page 4 and 5: Figure 71: E-W seismic line showing
Page 6 and 7: Figure 72: Williams & Curry (1992)
Page 8 and 9: Summary of D2/D3In summary, the D2
Page 10 and 11: Figure 77: Map of D4 structures and
Page 12 and 13: Figure 78: Map of D5 structures and
Page 14 and 15: Pink - granites, Yellow -sediments
Page 18 and 19: AcknowledgementsThis project has be
Page 20 and 21: Keays, W.R.H. Ramsay, and D.I. Grov
Page 22 and 23: Myers, J.S., 1997. Preface; Archaea

92 The Lawlers Anticline and the Mt Margaret Anticline are located ...

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