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Hallenberger, Maximilian; Reuning, Lars; Back, Stefan; Gallagher, Stephen John; Iwatani, Hokuto; Lindhorst, Katja: Abundance of non-skeletal grains from IODP Site 356-U1461. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.927008 (dataset in review)

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Abstract:
The North West Shelf of Australia is an extensive tropical carbonate ramp and forms an important template for the interpretation of similar systems in the sedimentary record. Yet, little is known about the development of the distally steepened ramp from the middle to late Quaternary, a period of high frequency glacioeustatic changes in sea level and climate. This research describes core and seismic-reflection data from a mid- to outer ramp transect at the Northwest Shelf. Throughout the studied core section, several sections rich in ooids and peloids occur. Sediment samples were investigated for their abundance of these non-skeletal grains to better understand the timing and condition of their formation. During arid glacial lowstands, sedimentation is characterized by inorganically precipitated carbonates, including ooids and peloids. Ooids developed under shallow-marine conditions on small-scale flat-topped platforms. Seismic and sedimentological evidence indicates that these platforms grew locally on top of the present-day mid ramp and were typically only active during a single glacial period.
Keyword(s):
Aragonite-needle mud; Australian Shelf; Distally steepened ramp; Lowstand shedding; NWS; Ooids
Related to:
Hallenberger, Maximilian; Reuning, Lars; Back, Stefan; Gallagher, Stephen John; Iwatani, Hokuto; Lindhorst, Katja (submitted): Internal Architecture of a carbonate ramp exposed to high amplitude sea-level fluctuations: Evidence from the NW shelf of Australia. Sedimentology
Hallenberger, Maximilian; Reuning, Lars; Back, Stefan; Gallagher, Stephen John; Iwatani, Hokuto; Lindhorst, Katja: P-wave velocity measurement from IODP Site 356-U1461. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.927017
Coverage:
Median Latitude: -20.214123 * Median Longitude: 115.065658 * South-bound Latitude: -20.214200 * West-bound Longitude: 115.065615 * North-bound Latitude: -20.214045 * East-bound Longitude: 115.065700
Date/Time Start: 2015-08-18T16:00:00 * Date/Time End: 2015-11-20T09:40:00
Minimum DEPTH, sediment/rock: 0.43 m * Maximum DEPTH, sediment/rock: 83.64 m
Event(s):
356-U1461B * Latitude: -20.214200 * Longitude: 115.065700 * Date/Time: 2015-08-18T16:00:00 * Penetration: 879.20 m * Recovery: 743.24 m * Campaign: EXP356 * Basis: Joides Resolution * Method/Device: Autoclave piston corer (APC)
356-U1461C * Latitude: -20.214045 * Longitude: 115.065615 * Date/Time: 2015-11-20T09:40:00 * Elevation: -264.2 m * Penetration: 443.90 m * Recovery: 448.53 m * Campaign: EXP356 * Basis: Joides Resolution * Method/Device: Rotary core drilling (RCD)
Comment:
A total of 62 samples were wet- and dry sieved to investigate sediment based on their size fractions. Used mesh-sizes include 64, 125, 250, and 500 μm. Non-skeletal grains were then counted and weighted from the larger 64-µm fractions to determine their abundance as a weight percentage of the total sample mass. The relative abundance of ooids and peloids were then differentiated on 42 thin-section samples under petrographic microscope (Olympus BH-2, Olympus Corporation, Tokyo, Japan).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventHallenberger, Maximilian
2Latitude of eventLatitudeHallenberger, Maximilian
3Longitude of eventLongitudeHallenberger, Maximilian
4Date/Time of eventDate/TimeHallenberger, Maximilian
5DEPTH, sediment/rockDepth sedmHallenberger, MaximilianGeocode – Depth CSF-A (m)
6DEPTH, sediment/rockDepth sedmHallenberger, MaximilianGeocode – Depth CCSF-A (m)
7Non-skeletal grainsNon-skel grains%Hallenberger, Maximiliansee comment
8OoidsOoids%Hallenberger, Maximiliansee commentSup
9Cortex thicknessCortex thickµmHallenberger, Maximiliansee comment
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Size:
97 data points

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