{ "type":"Feature", "geometry":{ "type":"Point", "coordinates":[ 141.62446, -33.49948, 68.50718 ] }, "properties":{ "igsn":"10.60494/dg1n-8x50", "sample_id":"2023330043", "eno":867077, "sampling_feature_name":"NDIWMP02", "sampling_feature_type":"borehole", "sample_type":"half core", "sampling_method":"core drilling", "material_class":"rock", "stratigraphic_unit":null, "geological_province":"Delamerian Orogen", "sample_remark":"Mole et al. (2024): Drillhole NDIWMP02 samples a prominent NE-trending magnetic lineament. Magmatic units in this hole are magnetic and are probably the cause of the magnetic anomaly. The sedimentary rocks towards the bottom of the hole are less magnetic. This hole was drilled using a conventional diamond drill-rig, reached a total depth of 646.3 m, and recovered about 100 m of diamond core. The primary lithologies in the hole are (1) an intermediate porphyritic intrusion (represented by samples 9652125/2023330042 and 9652129/2023330043), which occurs above a (2) fine- to medium-grained siliciclastic unit (represented by sample 9652132/2023330034). Contact between both units occurs across ~10 cm and is altered and fractured, making the primary nature of the contact unclear. The porphyritic unit varies subtly between a more aphanitic and aphyric phase (represented by current sample 9652129/2023330043) and a more porphyritic phase (represented by sample 9652125/2023330042), although there is no clear boundary. In terms of alteration, the entire core, including the siliciclastic rock, is variably altered (mostly pinkish hematite staining of albite, with some lighter-coloured alteration (sericite?) surrounding fractures and veins). Zoned plagioclase phenocrysts within the porphyry are commonly altered to a pale greenish colour. Sample 9652129/2023330043 was taken from a less porphyritic interval of the rhyo-dacite porphyry, where pXRF data yielded Zr contents of ~250 ppm. This sample is more altered (pale-pink) and/or potassic than the more porphyritic sample 9652125/2023330042 higher in the hole. In thin section, sample 9652129/2023330043 is a medium-grained amphibole-biotite-bearing granitic granophyric high-level intrusive of I-type affinity. It comprises 1-2 mm granophyric intergrowths of K-feldspar and quartz, with lesser phenocrysts of plagioclase, quartz and, recrystallised ferromagnesian phenocrysts set in fine-grained polygonal quartz-feldspar-rich groundmass. Radiating granophyric intergrowths of K-feldspar and quartz are the most common feature. Most granophyric grains are 1-2 mm and radiating intergrowths are often centred around a fine-grained quartz inclusion forming relatively coarse spherulites. Plagioclase phenocrysts are evenly distributed as stout tabular grains up to 4 mm. Grains display overall normal zonation, with internal oscillatory zoning, and ghostly simple and polysynthetic twinning; anorthite content could not be estimated due to pervasive sericite replacement. Quartz phenocrysts are uncommon, usually <1 mm and typically subhedral, hexagonal with embayments of the surrounding granophyre. Ferromagnesian phenocrysts (0.5-1.5 mm) are recrystallised to decussate masses of red-brown biotite, or intergrowths of deep blue-green actinolite that may be quartz-sieved. Grain shapes vary from anhedral to tabular and the recrystallised masses are likely after primary amphibole and biotite. Accessory phases include equant magnetite associated with recrystallised ferromagnesian phenocrysts, prismatic zircon associated with amphibole masses, monazite, and stout tabular apatite. The groundmass is a recrystallised polygonal mosaic of fine-grained (0.05-0.10 mm) quartz, micrographic K-feldspar-quartz intergrowths, narrow biotite books and tabular actinolite. The granophyric to spherulitic textures are consistent with a very high-level subvolcanic intrusive, or possibly moderately porphyritic, spherulitic lava. Although the fine granophyric textures are preserved, ferromagnesian phases are completely recrystallised, along with the groundmass. There is no major signs of deformation and the secondary mineralogy is most consistent with recrystallisation under albite-epidote hornfels facies conditions.", "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":141.62446, "gda94_latitude":-33.49948, "sample_originator":"Clark, A.", "date_acquired":"2023-11-26T00:00:00" }, "id":9652129, "prev":9652128, "next":9652130, "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/9652129?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/9652129?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://linkeddata.pid.geoscience.gov.au/collections/sp/items/9652129?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/9652128?f=json" }, { "rel":"next", "type":"application/json", "href":"https://linkeddata.pid.geoscience.gov.au/collections/sp/items/9652130?f=json" } ], "pid":"https://pid.geoscience.gov.au/sample/AU9652129" }