Publication Date:
2024-01-09
Description:
Petrographic observation and carbonate mineralogic and stable isotopic investigation were conducted on lower Oligocene to middle Miocene sediments recovered during Ocean Drilling Program Leg 182 from Site 1132, located at a water depth of 218.5 m immediately seaward of the shelf-slope break of the eastern Eyre Terrace in the western Great Australian Bight. The middle Miocene section consists of bioclastic packstone and grainstone with an interval of partially silicified nannofossil-foraminiferal chalk and is slightly to densely dolomitized. By contrast, the lower Oligocene to lower Miocene section is characterized by a predominance of planktonic and benthic foraminifers, high porosity, absence of chert, and weak dolomitization. The carbon and oxygen isotopic composition of calcites and dolomites between two sections, however, shows no significant difference.
Keywords:
182-1132C; Calcium carbonate; DEPTH, sediment/rock; Dolomite; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Great Australian Bight; Joides Resolution; Leg182; Lithologic unit/sequence; Low magnesium calcite; Mass spectrometer Finnigan Delta Plus; Ocean Drilling Program; ODP; Sample code/label; X-ray diffraction (XRD); δ13C, calcite; δ13C, dolomite; δ18O, calcite; δ18O, dolomite
Type:
Dataset
Format:
text/tab-separated-values, 254 data points
