{ "type":"Feature", "geometry":{ "type":"Point", "coordinates":[ 141.09158, -32.591466, 150.18168 ] }, "properties":{ "igsn":"10.60494/zchz-ch96", "sample_id":"2023330027", "eno":867066, "sampling_feature_name":"NDILLK12", "sampling_feature_type":"borehole", "sample_type":"half core", "sampling_method":"core drilling", "material_class":"rock", "stratigraphic_unit":null, "geological_province":"Delamerian Orogen", "sample_remark":"Drillhole NDILLK12 samples a NE-trending zone of mostly non-magnetic sedimentary rocks cross-cut by numerous NW-trending magnetic lineaments. None of the major magnetic lineaments were intersected in drillcore. However, a thin (<1 m), slightly magnetic dyke in drillhole NDILLK12 intrudes the non-magnetic sedimentary rocks and is probably analogous to the more prominent magnetic lineaments in the NE-tending zone. Sample 9652095 was taken from the non-magnetic sediments. Hole NDILLK12 was drilled using a conventional drill-rig to a total depth of 237.8 m and obtained a ~100 metre diamond-core basement intersection. This mostly consisted of laminated and foliated siltstone and graphitic shale. A weak foliation and oriented sub-parallel to bedding. The sedimentary rocks are multiply deformed: D1 is more ductile, associated with pervasive foliation, while D2 is characterised by more brittle-ductile folding and faulting. Olivine basalt dykes which cross-cut D1 and D2 structures (i.e. sample 9652090/2023330028, this Record) have undulose margins, but are in-turn cross-cut by some veins, suggesting that they intruded late/syn D2. Dykes have well-preserved chilled margins and zoned cores, with abundant feldspar phenocrysts towards their centres. They also exhibit some alteration associated with the overprinting quartz-carbonate veins. The sampled interval consists of laminated (1-10 mm beds) siltstone and graphitic shale, crosscut by minor quartz-carbonate veins (1-2 mm thick). This interval was selected for sampling because it is more homogeneous and less-deformed than elsewhere, and because portable X-ray fluorescence (pXRF) analyses yielded Zr contents of ~270 ppm. In thin section, sample 9652095/2023330027 is laminated very fine- to fine-grained sandstone to siltstone. Laminations are 1.0-4.0 mm with normal grading often well-developed. Sandstone laminations are typically very fine-grained (0.1-0.15 mm) subarkosic and dominated by angular to subrounded, moderate sphericity quartz with subordinated tabular feldspar grains. Framework grains are densely-packed (common triple junctions) and dust lines are locally well-preserved indicating silica cementation. Accessory phases include detrital white mica and chlorite, with tourmaline, zircon, and apatite being more common towards bed bases. Matrix abundance is variable, particularly as the sandstone grades towards siltstone. Matrix comprises a dark brown mix of white mica, chlorite, and fine oxide minerals. Framboidal pyrite is common throughout the sandstone laminations and may be the dominant matrix phase. Sandstone laminations grade normally to a quartz-rich, coarse siltstone (0.02-0.03 mm). The mineralogical changes that occur as sandstone grades to siltstone include; increased abundance of the dark white mica-chlorite-rich matrix, increased abundance of detrital white mica (defining a bedding parallel detrital foliation), and decreased abundance of quartz and feldspar grains. The sandstone is crosscut by several carbonate veins and bedding laminations can display a small offset across these veins. The sample has also experienced minor bedding parallel shearing with very narrow chlorite-carbonate-lined shears developed at sandstone bed bases. Carbonate veins also appear to have exploited these shears, suggesting veining and weak deformation were synchronous.", "earth_materials":"Y", "structural_measurements":null, "inorganic_geochemistry":"Y", "organic_geochemistry":null, "geochronology":"Y", "isotope_groups":null, "hydrochemistry":null, "rock_properties":null, "mineralogy":null, "thin_sections":null, "repository_samples":"Y", "mineral_deposit_samples":null, "mineral_deposit_waste_samples":null, "linked_files":null, "other_geological_data":null, "project_name":"EFTF - Darling-Curnamona-Delamarian (DCD)", "gda94_longitude":141.09158, "gda94_latitude":-32.591466, "sample_originator":"Clark, A.", "date_acquired":"2023-11-26T00:00:00" }, "id":9652095, "prev":9652094, "next":9652100, "links":[ { "type":"application/json", "rel":"root", "title":"The landing page of this server as JSON", "href":"https://linkeddata.pid.geoscience.gov.au?f=json" }, { "type":"text/html", "rel":"root", "title":"The landing page of this server as HTML", "href":"https://linkeddata.pid.geoscience.gov.au?f=html" }, { "rel":"self", "type":"application/geo+json", "title":"This document as JSON", "href":"https://linkeddata.pid.geoscience.gov.au/collections/sp/items/9652095?f=json" }, { "rel":"alternate", "type":"application/ld+json", "title":"This document as RDF (JSON-LD)", "href":"https://linkeddata.pid.geoscience.gov.au/collections/sp/items/9652095?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://linkeddata.pid.geoscience.gov.au/collections/sp/items/9652095?f=html" }, { "rel":"collection", "type":"application/json", "title":"Sample", "href":"https://linkeddata.pid.geoscience.gov.au/collections/sp" }, { "rel":"prev", "type":"application/json", "href":"https://linkeddata.pid.geoscience.gov.au/collections/sp/items/9652094?f=json" }, { "rel":"next", "type":"application/json", "href":"https://linkeddata.pid.geoscience.gov.au/collections/sp/items/9652100?f=json" } ], "pid":"https://pid.geoscience.gov.au/sample/AU9652095" }