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APPENDIX A4.11: Geological Characteristics of the Project Area

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APPENDIX A4.11: Geological characteristics of the project area Distance (KP) Geological Period or era Major lithology of primary (upper unit) formation (primary unit) AB mainline Volcanic rocks, predominantly mafic; basalt, trachyte, trachybasalt, trachyandesite, Mafic volcanic Cainozoic leucitite, basanite, nephelinite, limburgite, rock rhyolite, tuff and high level intrusives; rare AB0 to AB28 volcaniclastic sediments. Lithic sandstone, pebbly lithic sandstone, Rewan Group Triassic green to reddish brown mudstone and minor volcanilithic pebble conglomerate (at base). Quartz sandstone, clayey sandstone, Sutton mudstone and conglomerate; fluvial and Cainozoic Formation lacustrine sediments; minor interbedded basalt. Colluvium and/or residual deposits, talus, scree, sheet wash; boulder, gravel, sand; Colluviums Quaternary may include minor alluvial owler sand plain deposits. Lithic sandstone, pebbly lithic sandstone, Rewan Group Triassic green to reddish brown mudstone and minor volcanilithic pebble conglomerate (at base). AB28 to AB74 Channel and flood-plain alluvium; gravel, Alluvium Quaternary sand, silt, clay; may be incised by present day drainage. Ferruginous duricrust, laterite; may include Ferruginous Cainozoic massive to pisolitic ferruginous subsoil, duricrust mottled clays. Volcanic rocks, predominantly mafic; basalt, trachyte, trachybasalt, trachyandesite, Mafic volcanic Cainozoic leucitite, basanite, nephelinite, limburgite, rocks rhyolite, tuff and high level intrusives; rare volcaniclastic sediments. Sandstone, siltstone, shale, mudstone, coal, Blackwater tuff, conglomerate. AB74 to AB93 Late Permian Group Section includes mafic volcanic rocks, Rewan Group, alluvium. Sand plain, may include some residual alluvium; sand dominant, gravel, clay. AB93 to AB142 Sand plain Cainozoic Section includes alluvium, Rewan Group, Blackwater Group, colluviums. Mudstone, sandstone, conglomerate, Duaringa AB142 to AB180 Late Eocene siltstone, oil shale, lignite, basalt. Formation Section includes sandplain, alluvium. Arrow Bowen Pipeline Project Environmental Impact Statement Appendix A.4.11-1 Distance (KP) Geological Period or era Major lithology of primary (upper unit) formation (primary unit) Quartzose to lithic sandstone, siltstone, carbonaceous shale, minor coal and sandy Back Creek AB180 to AB227 Late Permian coquinite Group Section includes sandplain, Duaringa Formation, alluvium. Igneous intermediate volcanic. AB227 to AB261 Trachyte Cainozoic Section includes Duaringa Formation, alluvium, sand plain, Back Creek Group. Basaltic to andesitic lava and volcaniclastic rocks (including breccia and arenite), Lizzie Creek rhyolitic to dacitic lava and volcaniclastic AB261 to AB279 Permian Volcanics rocks (including ignimbrite); local siltstone, shale and polymictic conglomerate. Section includes alluvium, sand plain Siltstone and mudstone, volcanilithic sandstone and conglomerate and minor altered basalt; local rhyolitic to dacitic AB279 to AB307 Carmila beds Early Permian ignimbrite and volcaniclastic rocks. Section includes Back Creek Group, alluvium. Undifferentiated consolidated Cainozoic sedimentary rocks; sandstone, limestone, Sedimentary AB307 to AB313 Cainozoic conglomerate, siltstone commonly rocks ferruginised, silicified or poorly consolidated. Section includes colluviums. Basalt and high-level mafic intrusives, minor Rookwood AB313 to AB316 Early Permian rhyodacite lava, volcaniclastic breccia, lithic Volcanics sandstone, siltstone and mudstone. Dark grey mudstone, siltstone, felsic volcaniclastic sandstone, polymictic conglomerate, ooid-bearing sandstone and Rockhampton Early conglomerate with mudstone rip-up clasts; AB316 to AB234 Group Carboniferous oolitic and pisolitic limestone and minor skeletal limestone; rare rhyolitic ignimbrite. Section includes Rookwood Volcanics, alluvium. Sandstone, siltstone, mudstone, andesitic to dacitic volcanics, volcaniclastic breccia, AB324 to AB328 Craigilee beds Early Devonian limestone, polymictic conglomerate, sparse peperite and andesite to dacite intrusive. Thinly interbedded fine-grained sandstone and siltstone and thick beds of conglomerate Mount Alma Early with andesitic to dacitic clasts and siltstone AB328 to AB348 Formation Carboniferous rip-up-clasts. Section includes Craigilee beds, alluvium, Rockhampton Group. Arrow Bowen Pipeline Project Environmental Impact Statement Appendix A.4.11-2 Distance (KP) Geological Period or era Major lithology of primary (upper unit) formation (primary unit) Grey medium-grained biotite-hornblende to hornblende-biotite granodiorite, grey to Ridgelands cream medium-grained biotite-hornblende AB348 to AB354 Early Triassic Granodiorite tonalite to quartz diorite, locally xenolith- bearing. Section includes alluvium. Thinly interbedded fine-grained sandstone and siltstone and thick beds of conglomerate Mount Alma Early with andesitic to dacitic clasts and siltstone AB354 to AB358 Formation Carboniferous rip-up-clasts. Section includes Ridgelands Granodiorite, alluvium. Alton Downs AB358 to AB360 Late Cretaceous Olivine- and feldspar-phyric basalt. Basalt Rhyolitic and trachytic flows, breccia, ignimbrite and tuff; basalt. Mount Salmon AB360 to AB392 Cretaceous Volcanics Section includes Rockhampton Group, Mount Alma Formation, alluvium, Alton Downs Basalt. Altered grey medium-grained hornblende quartz monzodiorite, dark grey hornblende- Kabra Quartz AB392 to AB396 Triassic augite quartz gabbro, hornblende- Monzodiorite hypersthene-augite-biotite quartz gabbro Section includes alluvium Pale grey medium-grained leucocratic hornblende-biotite tonalite, minor pale pink Bundaleer AB396 to AB411 Early Triassic medium-grained biotite granite. Tonalite Section includes sand plain, alluvium, Rockhampton Group, mafic intrusive. Dolerite, gabbro, diorite. AB411 to AB472 Mafic intrusives Cretaceous Section includes Rockhampton Group, alluvium, Mount Alma Formation. Siltstone, lithofeldspathic sandstone, intermediate to felsic intrusive and extrusive domes, volcanic breccia, minor AB472 to AB477 Berserker Group Permian conglomerates. Section includes alluvium, Rockhampton Group. Elphinstone Lateral Lithic sandstone, pebbly lithic sandstone, green to reddish brown mudstone and minor EL0 to EL11.4 Rewan group Triassic volcanilithic pebble conglomerate (at base). Potential presence of alluvium. EL11.4 to Channel and flood plain alluvium; gravel, Alluvium Quaternary EL12.8 sand, silt, clay. Arrow Bowen Pipeline Project Environmental Impact Statement Appendix A.4.11-3 Distance (KP) Geological Period or era Major lithology of primary (upper unit) formation (primary unit) Undifferentiated consolidated Cainozoic sedimentary rocks; sandstone, limestone, EL12.8 to Sedimentary Cainozoic conglomerate, siltstone; commonly EL23.8 rocks ferruginised, silicified or poorly consolidated. Section includes Rewan group, alluvium. Sand plain may include some residual alluvium; sand dominant, gravel, clay. EL23.8 to EL52 Sand plain Cainozoic Section includes colluviums, Rewan group, alluvium, sedimentary rocks. Saraji Lateral Sand plain, may include some residual Sand plain Cainozoic alluvium; sand dominant, gravel, clay. SL0 to SL26 Channel and flood plain alluvium; gravel, Alluvium Quaternary sand, silt, clay. Dysart Lateral Duaringa Mudstone, sandstone, conglomerate, Middle Eocene DL0 to DL19.7 formation siltstone, oil shale, lignite, basalt. Quaternary Sand plain Sand, silt, gravel and clay. DL19.7 to Blackwater Sandstone, siltstone, shale, mudstone, coal, Late Permian DL21.1 group tuff, conglomerate. Sand plain, may include some residual DL21.1 to DL26 Sand plain Cainozoic alluvium; sand dominant, gravel, clay. Arrow Bowen Pipeline Project Environmental Impact Statement Appendix A.4.11-4 .
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