| _version_ | 1867171024203677696 |
|---|---|
| author | Hallenberger, Maximilian Reuning, Lars Back, Stefan Gallagher, Stephen John Iwatani, Hokuto Lindhorst, Katja |
| author_facet | Hallenberger, Maximilian Reuning, Lars Back, Stefan Gallagher, Stephen John Iwatani, Hokuto Lindhorst, Katja |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. Information on bulk density was used for the creation of an acoustic impedance log as well as to determine the influence of sedimentary facies and mineralogy on the creation of seismic reflections. Observed bulk density is strongly correlated to facies related changes in mineralogy and porosity. Low porosity aragonitic sections composed of non-skeletal grains display the largest bulk densities. In comparison, bioclastic sediments, which are largely composed of the less dense calcite, have average bulk densities. Lowest bulk densities can be observed in aragonitic mudstones. This is attributed to the high amounts of microporosity present in this facies. Based on these observations, changes in acoustic impedance are to be expected during facies transitions. Thus, reflections observed in seismic can be linked to changes in the sedimentary system. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_927012 |
| institution | PANGAEA |
| language | en |
| publishDate | 2024 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Bulk density from IODP Site 356-U1461 Hallenberger, Maximilian Reuning, Lars Back, Stefan Gallagher, Stephen John Iwatani, Hokuto Lindhorst, Katja 356-U1461A; 356-U1461B; APC; Aragonite-needle mud; Australian Shelf; Autoclave piston corer; Date/Time of event; Density; DEPTH, sediment/rock; Distally steepened ramp; Event label; Exp356; Half-length advanced piston corer; HLAPC; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Latitude of event; Longitude of event; Lowstand shedding; NWS; Ooids; Whole-round multisensor core logger (MSCL-W) (GeoTek) 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. Information on bulk density was used for the creation of an acoustic impedance log as well as to determine the influence of sedimentary facies and mineralogy on the creation of seismic reflections. Observed bulk density is strongly correlated to facies related changes in mineralogy and porosity. Low porosity aragonitic sections composed of non-skeletal grains display the largest bulk densities. In comparison, bioclastic sediments, which are largely composed of the less dense calcite, have average bulk densities. Lowest bulk densities can be observed in aragonitic mudstones. This is attributed to the high amounts of microporosity present in this facies. Based on these observations, changes in acoustic impedance are to be expected during facies transitions. Thus, reflections observed in seismic can be linked to changes in the sedimentary system. |
| title | Bulk density from IODP Site 356-U1461 |
| topic | 356-U1461A; 356-U1461B; APC; Aragonite-needle mud; Australian Shelf; Autoclave piston corer; Date/Time of event; Density; DEPTH, sediment/rock; Distally steepened ramp; Event label; Exp356; Half-length advanced piston corer; HLAPC; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Latitude of event; Longitude of event; Lowstand shedding; NWS; Ooids; Whole-round multisensor core logger (MSCL-W) (GeoTek) |
| url | https://doi.org/10.1594/PANGAEA.927012 |