9655243
Persistent Identifier: https://pid.geoscience.gov.au/sample/AU9655243
| Property | Value |
|---|---|
| id | 9655243 |
| igsn | 10.60494/drxp-hd52 |
| sample_id | 6731RS49 |
| eno | 912538 |
| sampling_feature_name | 6731RS49 |
| sampling_feature_type | field site |
| sample_type | outcrop specimen |
| sampling_method | outcrop sampling |
| material_class | rock |
| stratigraphic_unit | Bendigo Granite |
| geological_province | Delamerian Orogen |
| sample_remark | Fanning & Webb (1990): Sample 6731RS49 is an even grained to slightly porphyritic granitoid that consists of feldspar and quartz with lesser biotite and hornblende, and secondary epidote, sericite and chlorite. Plagioclase is the dominant feldspar, occurring as strongly zoned crystals up to 5 mm in length giving the rock a slightly porphyritic texture. The cores of the coarser plagioclase crystal are variably altered to sericite and clay minerals, whilst the rims and the finer grains are little altered. Quartz is generally finer grained and interstitial to the plagioclase, occurring as equant grains with irregular grain margins. The quartz shows undulose to strongly undulose extinction and some subgrain developments. Biotite and hornblende are present as minor primary igneous phases in roughly equal proportions. The biotite is brown to dark brown in colour and variably altered to chlorite. The hornblende occurs as ragged, disjointed grains or aggregates of grains. Secondary epidote often occurs together with and replacing the hornblende within such aggregates. Anhedral opaques, apatite, titanite and zircon are all present in accessory amounts. The zircon is typically elongate euhedral crystals that are strongly zoned. This is a slightly porphyritic hornblende bearing granodiorite that has been weakly deformed as evidenced by the strained quartz. It has been subjected to a low temperature secondary alteration with epidote, chlorite and sericite formed. The zircons are dominantly elongate euhedral doubly terminated crystals. They are generally colourless or have a pinkish tinge, though many are iron stained with pale red to pale pink inclusions. In oil mounts the zircons are strongly zoned, and for many of the zircons this zonation is continuous from the cores to the rims implying that it is a primary igneous growth zonation. However, some grains appear to have discontinuities in the zoning, and there is a possibility that in these grains the zonation may be reflecting several temporally distinct zircon crystailisation episodes. |
| earth_materials | Y |
| structural_measurements | None |
| inorganic_geochemistry | None |
| organic_geochemistry | None |
| geochronology | None |
| isotope_groups | None |
| hydrochemistry | None |
| rock_properties | None |
| mineralogy | None |
| thin_sections | None |
| repository_samples | None |
| mineral_deposit_samples | None |
| mineral_deposit_waste_samples | None |
| linked_files | None |
| other_geological_data | None |
| project_name | EFTF - Isotopic Atlas of Australia |
| gda94_longitude | 139.4466342 |
| gda94_latitude | -33.2070345 |
| sample_originator | Amdel |
| date_acquired | 2000-01-01 00:00:00 |
| Links |
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