Download Basement Tectonics 9: Australia and Other Regions by R. W. R. Rutland (auth.), M. J. Rickard, H. J. Harrington, PDF

By R. W. R. Rutland (auth.), M. J. Rickard, H. J. Harrington, P. R. Williams (eds.)

The 9th overseas convention on Basement Tectonics was once held on the Australian nationwide college in Canberra 2-6 July 1990. the hole keynote tackle was once given through Prof. R.W.R. Rutland, Director of the Bureau of Mineral assets. different keynote audio system have been E.S.T. O'Driscoll, an Australian advisor, and Prof P. Bankwitz, imperative Institute for Physics of the Earth, Potsdam, GDR. Technical classes have been prepared by way of consultation conveners at the following 5 subject- i) The constitution of the Australian craton and canopy basins; ii) Basement constitution of continental areas; iii) Structural styles and mineral deposits; iv) recommendations for analysing basement constructions; v) Structural styles in oceanic crust. The association of papers for this complaints quantity has been simplified. half 1 offers with Australia, half 2 with different components and half three lists the titles of all of the papers learn on the convention. Abstracts of those papers are available Geological Society of Australia Abstracts No 26 and will be bought for $AI0 from the Geological Society of Australia place of work, ANA apartment, 301 George road, Sydney NSW 2000. box journeys to view facets of the Lachlan Fold Belt and the Sydney Basin have been assisted by way of H.J. Harrington, D. Branagan, D. Wyborn, B. Drummond and M.J. Rick~d. an extended box journey, aborted via low enrolments, was once geared up through H.J. Harrington with the help of W. Preiss, N. cook dinner, R. Glenn, A. Grady, and P. James; this help is gratefully acknowledged.

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Additional info for Basement Tectonics 9: Australia and Other Regions Proceedings of the Ninth International Conference on Basement Tectonics, held in Canberra, Australia, July 1990

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44 .. ' \~ \ dl -dolerite Pgk-McKinluy Granite Pf b -Burrell Creek Fm. so -Mount Bonnie Fm Psg -Gerowie Tutf E'sk -Koolpin Fm E'pw-Wildman Siltstone \\ ~ Axis of anticline ~~ Axis of syncline - 7 Fold axis - - - Fault Trend of foliation -=-=- Figure 1. Generalized geology of the Pine Creek Shear Zone and surrounding areas between Boomleera Siding and Mount Wells (modified and simplified from Stuart-Smith et al. 1987). isoclinal, NNW-N trending and associated with the main Dl phase of deformation.

I: 5' Radlus:l0% Figure 4. Equal area stereographic projections of faults and striations, from around the Northampton Block, in (a) Silurian Tumblagooda Sandstone and (b) Middle Jurassic Bringo Shale. Moving-average rose diagrams of joints in (c) Tumblagooda Sandstone and (d) Lower Jurassic Greenough Sandstone (dips are subvertical). FAULT PATTERNS, PERTH BASIN 33 modally significant. These joint sets are parallel to the E-W and NNW trending faults in the Bringo Shale (Fig. 4b), which suggests that the joints formed during the Middle Jurassic.

In the field, these lineaments correspond to ductile shear zones containing mylonitised gneiss and pegmatite, 1m-35m wide. Shear criteria within the mylonites, and the regional drag of foliation into the shear zones, are indicative of normal movement. 9km and 2km of vertical displacement would be required along these mylonite zones in order to give the observed horizontal offsets. Alternatively, later brittle strike-slip reactivation may have taken place; however, no such structures have been observed (but limited outcrop and erosion along these lineaments does not completely preclude this possibility).

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