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Ito, Makoto; O'Connell, Suzanne B; Stefani, Ann; Borella, Peter E (1992): Composition of Carnian to Norian sandstones from the Wombat Plateau (Table 1). PANGAEA,, Supplement to: Ito, M et al. (1992): Fluviodeltaic successions at the Wombat Plateau: Upper Triassic siliciclastic-carbonate cycles. In: von Rad, U; Haq, BU; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 122, 109-128,

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The Carnian to Norian sediments, as much as 600 m in total thickness, recovered from ODP Sites 759 and 760 on the Wombat Plateau, are generally represented by fluvial-dominated deltaic successions.
In general, the Carnian to Norian sandstones are quartzose. The average ratio of monocrystalline quartz grains, total feldspar grains, and total lithic fragments (i.e., Qm:F:Lt ratio) is 71:22:7. This indicates that they were derived mainly from the transitional continental and cratonic interior provenance terranes, such as the Pilbara Precambrian block to the south of the Wombat Plateau. The upper Carnian sediments, however, are characterized by more feldspathic sandstone petrofacies. They typically contain some volcanic rock fragments with trachytic texture and indicate the onset of the incipient rift-related tectonic movement, such as uplift and subsequent abrupt basin
subsidence, together with volcanism in the Gondwana continental block.
Mixed siliciclastic and carbonate cycles are typically intercalated in the prodelta to delta front deposits that developed mainly in a lagoon-like, restricted marine environment. The restricted marine environment developed during transgressions as the outflow of shallow water was restricted by depositional barriers. Around the barriers and/or delta lobes, carbonate shoals/banks were probably developed and the allochemical components of the neritic limestones may have been transported into the restricted marine environment by overwash processes and/or storm waves. Siliciclastic detritus, on the other hand, was mainly derived accompanied by delta progradation dominated by fluvial processes in the restricted marine environment. Therefore, we interpret the mixed siliciclastic and carbonate cycles in the deltaic successions to be a result of transgression-regression cycles in a deltaic system during the Late Triassic.
Median Latitude: -16.932667 * Median Longitude: 115.547633 * South-bound Latitude: -16.954000 * West-bound Longitude: 115.541100 * North-bound Latitude: -16.922000 * East-bound Longitude: 115.560500
Date/Time Start: 1988-07-09T07:00:00 * Date/Time End: 1988-07-19T00:45:00
Minimum Elevation: -2103.0 m * Maximum Elevation: -1981.0 m
122-759B * Latitude: -16.954000 * Longitude: 115.560500 * Date/Time Start: 1988-07-09T07:00:00 * Date/Time End: 1988-07-11T21:15:00 * Elevation: -2103.0 m * Penetration: 308 m * Recovery: 129.6 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 39 cores; 308 m cored; 0 m drilled; 42.1 % recovery
122-760A * Latitude: -16.922000 * Longitude: 115.541300 * Date/Time Start: 1988-07-11T23:15:00 * Date/Time End: 1988-07-14T13:00:00 * Elevation: -1981.0 m * Penetration: 284.9 m * Recovery: 196.38 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 284.9 m cored; 0 m drilled; 68.9 % recovery
122-760B * Latitude: -16.922000 * Longitude: 115.541100 * Date/Time Start: 1988-07-14T13:00:00 * Date/Time End: 1988-07-19T00:45:00 * Elevation: -1981.0 m * Penetration: 506 m * Recovery: 123.02 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 506 m cored; 0 m drilled; 24.3 % recovery
Normalized to 100%, counted grains.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Sample code/labelSample labelIto, MakotoODP sample designation
3StageStageIto, Makoto
4Quartz, monocrystallineMonoQz%Ito, MakotoCounting >62.5 µm fraction
5Quartz, polycrystallinePolyQz%Ito, MakotoCounting >62.5 µm fraction
6PlagioclasePl%Ito, MakotoCounting >62.5 µm fraction
7KalifeldsparKfs%Ito, MakotoCounting >62.5 µm fraction
8Lithic grainsLithic%Ito, MakotoCounting >62.5 µm fractionsedimentary
9Volcanic componentsVolcanic%Ito, MakotoCounting >62.5 µm fraction
10Metamorphic fragmentsMetam fragm%Ito, MakotoCounting >62.5 µm fraction
11QuartzQz%Ito, MakotoCounting >62.5 µm fractiontotal
12Lithic grainsLithic%Ito, MakotoCounting >62.5 µm fractiontotal
13FeldsparFsp%Ito, MakotoCounting >62.5 µm fractiontotal
696 data points

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