Tasmanian Geological Survey Record 2009/03 Geology of the southwestern and north–central parts of the Lyell 1:50 000 scale quadrangle by C . R. Calver DepartTasmanianment o fGeological Infrast Surveyructu Recreord, E n2009/03ergy and Resources 1 Mineral Resources Tasmania LYELL Figure 1. Location map of Lyell 1:50 000 scale quadrangle showing areas described in this report. Mineral Resources Tasmania PO Box 56 Rosny Park Tasmania 7018 Phone: (03) 6233 8377 l Fax: (03) 6233 8338 Email:
[email protected] l Internet: www.mrt.tas.gov.au CONTENTS SUMMARY ………………………………………………………………………………… 6 INTRODUCTION …………………………………………………………………………… 6 Acknowledgements ……………………………………………………………………… 7 STRATIGRAPHY …………………………………………………………………………… 8 WESTERN VOLCANO-SEDIMENTARY SEQUENCE …………………………………………… 8 Quartz-feldspar porphyry (Clq) ……………………………………………………………… 8 King River–Newall Creek area ………………………………………………………… 8 Garfield River area …………………………………………………………………… 8 Tuff, agglomerate, mudstone and sandstone (Clx) ……………………………………………… 8 King River–Newall Creek area ………………………………………………………… 8 Garfield River area …………………………………………………………………… 9 CENTRAL VOLCANIC COMPLEX…………………………………………………………… 10 Introduction …………………………………………………………………………… 10 Felsic feldspar porphyry intrusive and extrusive rocks (Ckvp) ……………………………………… 10 Introduction ………………………………………………………………………… 10 King River–Proprietary Peak area ……………………………………………………… 10 Intercolonial Spur …………………………………………………………………… 10 Dominantly feldspar-phyric pyroclastic rocks (Ckvr) ……………………………………………… 11 Introduction …………………………………………………………………………