Kaolinite clayrocks in the Triassic Banks Wall sandstone of the western blue mountains, New South Wales

Loughnan, F. C.; Goldbery, Ron; Holland, W. N.

doi:10.1080/00167617408728861

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…The red beds, commonly termed "chocolate shales", have much the same colour and composition as the haematite-rich flint clays of the Dunedoo Formation. In the Blue Mountains to the west of Sydney however, flint clays and red beds of comparable age to those in the southern Sydney Basin form lenticular units within massive quartzose sandstones (Loughnan et al, 1974). The Narrabeen flint clays vary in texture from predominantly pelletal to profusely oolitic (Fig.…”

Section: Flint Clays Of the Sydney Basinmentioning

confidence: 97%

Permian climate of the Sydney Basin -- cold or hot?

Loughnan¹

1991

Journal and Proceedings of the Royal Society of New South Wales

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The concept of a frigid to glacial climate prevailing in the Sydney Basin throughout most of the Permian has received general acceptance. Yet, on the basis of mineral composition of the strata, this conclusion is difficult to substantiate. Indeed, from the evidence available it would appear more likely that humid, warm to hot conditions, favourable for the development of kaolinite and in part bauxitic clayrocks, persisted at least intermittently from the earliest Permian through almost to the Middle Jurassic.Loughnan, F C. 1991. "Permian climate of the Sydney Basin --cold or hot?"

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Section: Flint Clays Of the Sydney Basinmentioning

confidence: 97%

Permian climate of the Sydney Basin -- cold or hot?

Loughnan¹

1991

Journal and Proceedings of the Royal Society of New South Wales

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“…Fine-grained sed i ment in the Narra been Group was pre vi ously stud ied by sev eral authors (e.g., Baker, 1956;Loughnan et al, 1964Loughnan et al, , 1974Goldbery and Hol land, 1973;Retallack, 1977). Ward (1972) noted quartzose, quartz-lithic and vol ca nic sand stones as the three sed i ment suites in the Narra been Group.…”

Section: Introductionmentioning

confidence: 95%

The influence of diagenetic alterations on porosity in the Triassic Narrabeen Group, Southern Sydney Basin, Australia

Gahtani¹

2013

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The in flu ence of diagenetic al ter ations on po ros ity in the Tri as sic Narra been Group, South ern Syd ney Ba sin, Aus tra lia Pe trog ra phy of the Tri as sic Narra been Group (South ern Syd ney Ba sin of Aus tra lia) was de scribed by thin sec tion, scan ning elec tron mi cro scope and X-ray dif frac tion tech niques. Sand stone com po si tion in cludes mostly lithic grains with mi nor quartz, feld spar, mica and heavy min er als; litharenites and sublitharenites are com mon and quartzarenites are rare. Quartz in cludes monocrystalline and polycrystalline grains while the feld spar in cludes both K-feld spar and plagioclase. Vol ca nic, sed i mentary and chert rock frag ments are pres ent. In thin sec tion po ros ity is vis i ble in all units, par tic u larly the coarse-grained de posits. Sec ond ary po ros ity is greater than the pri mary po ros ity. The diagenetic al ter ations in clude com pac tion, quartz overgrowths, authigenic clay min er als, car bon ate ce ment and authigenic feld spar. Com pac tion oc curred in all units dur ing diagenesis. Both early and late diagenetic car bon ate ce ment is im por tant in the Narra been Group. Pore-fill ing car bon ate cement re duced po ros ity whereas dis so lu tion of car bon ate re sulted in sec ond ary po ros ity. Authigenic clay min er als are widespread in all units fill ing pores and oc cur ring as grain-coat ings on de tri tal and authigenic grains. Where they coat quartz grains they pre serve po ros ity by pre vent ing growth of quartz overgrowths. Dis so lu tion of un sta ble feld spar and lithic grains pro vided sec ond ary po ros ity. In the Narra been Group, shale and siltstone are abun dant in the Wom barra Claystone, Stanwell Park Claystone, Bald Hill Claystone and New port For ma tion, form ing lithological seals and con fin ing lay ers. Mi nor sandstone beds oc cur in the Wom barra Claystone and con tain more po ros ity. Me dium-and coarse-grained sand stone is com mon in the Coal cliff Sand stone, Scarborough Sand stone and Bulgo Sand stone and shows low to mod er ate po ros ity. Thus, these sand stone units prob a bly con tain gas or wa ter.Key words: pe trog ra phy, diagenesis, pri mary po ros ity, sec ond ary po ros ity, quartz over growth, car bon ate ce ment. INTRODUCTIONIn the Syd ney Ba sin (Aus tra lia), the Narra been Group is the low er most of three Tri as sic rock units and is lo cated be tween the Up per Perm ian Illa warra Coal Mea sures and the Hawkesbury Sand stone (Ward, 1971a). Fine-grained sed i ment in the Narra been Group was pre vi ously stud ied by sev eral authors (e.g., Baker, 1956;Loughnan et al., 1964Loughnan et al., , 1974Goldbery and Hol land, 1973;Retallack, 1977). Ward (1972) noted quartzose, quartz-lithic and vol ca nic sand stones as the three sed i ment suites in the Narra been Group. Prov e nance mark ers of fore land ba sin-fill sed i ments were de ter mined by Cow an (1993). The com po si tion and tex ture of the Narra been Group were de scribed by McElroy (1954). De scrip tions of the pe trology in the N...

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“…In the west (Goldbery and Holland, 1973;Bembrick, 1980;and Loughnan et al, 1974), redbeds are Mt York Clay stone-Docker Head Clay stone; in east (Hanlon et al, 1954, p. 116), redbeds are Wombarra Claystone (12)-Bald Hill Claystone (17).…”

Section: Time Relations Central Sydney Basin-nefb (Fig 12 Table 5)mentioning

confidence: 99%

Eastern Australia

Veevers¹,

Conaghan²,

Powell³

et al. 1994

Geological Society of America Memoirs

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The Sydney-Gunnedah-Bowen Basin developed above the junction between (a) the western, early to mid-Paleozoic Lachlan and Thomson Fold Belts, terminally deformed and intruded in the mid-Carboniferous, and (b) the eastern, mid-to late Paleozoic New England Fold Belt (NEFB). Accordingly, the basement of the Sydney-Gunnedah-Bowen Basin varies along strike. In the south, the Sydney-Gunnedah Basin developed above the Late Devonian-Early Carboniferous Andean-type magmatic arc and fore arc, whereas in the north, the Bowen Basin developed behind the magmatic arc. The magmatic arc was displaced by crustal transtension during the latest Carboniferous-Early Permian. During transtension, the NEFB was intruded by S-type granitoids with co-magmatic ignimbrites and uplifted during right-lateral shearing to form the initial stage of an orocline.Thereafter to the end of the Triassic, eastern Australia developed through seven stages: Stage A (290-268 Ma), extension-volcanism of the collapsed Kanimblan-NEFB upland with thick volcanics and sediment, was a local manifestation of the first release of Pangean-induced heat and is comparable with the vast magmatic province of the same age that developed after the Variscan Orogeny in Europe. A glacio-eustatic marine transgression at 277 Ma crossed the NEFB to reach the newly formed Bowen and Sydney Basins. Stage B (268-258 Ma), a marine sag on the platform and embryonic magmatic arc/foreland basin, brought the sea to the western edge of the Bowen-Gunnedah-SydneyBasin and covered Tasmania. The first tuff attributable to the north-migrating convergent magmatic arc reached Tasmania 265 Ma, and the first convergent granitoid reached the NEFB also at 265 Ma and was followed by the deposition of coarse sediment in the embryonic foreland basin. Stage C (258-250 Ma), orogenic piedmont coal/tuff, initiated the foreland basin between the uplift of the mature NEFB and a foreswell that bounded the Galilee, Coorabin, and Tasmania Basins of the western craton. In Stage D (250-241 Ma), orogenic piedmont redbeds barren of coal and tuff, the sea was driven from the foreland basin by climactic outpouring of volcanolithic sediment from granitoids in the orogenic upland. Waning plutonic activity in the narrowing NEFB upland led to Stage E (241-235 Ma), a cratonic quartz-sand sheet that covered the entire foreland basin.Stage F (235-230 Ma), orogenic paralic sediment, saw a final pulse of sediment shed from the overthrusted NEFB. The terminal deformation and uplift of the NEFB represents the northern part of the Gondwanide event that involved the entire Panthalassan margin to South America in the final episode of the foreland basin/orogen. The final Stage G (230-200 Ma) involved rifting of the orogen by right-lateral transtension to form the Tarong and Ipswich coal and volcanic basins in a second release of Pangean heat. By the Early Jurassic, cratonic quartz sand breached the NEFB upland at the Queensland-New South Wales border. The modern New England upland dates from the mid-Cretaceous inception of the East...

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Kaolinite clayrocks in the Triassic Banks Wall sandstone of the western blue mountains, New South Wales

Cited by 8 publications

References 3 publications

Permian climate of the Sydney Basin -- cold or hot?

Permian climate of the Sydney Basin -- cold or hot?

The influence of diagenetic alterations on porosity in the Triassic Narrabeen Group, Southern Sydney Basin, Australia

Eastern Australia

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