9655752
Persistent Identifier: https://pid.geoscience.gov.au/sample/AU9655752
| Property | Value |
|---|---|
| id | 9655752 |
| igsn | 10.60494/4e7g-6378 |
| sample_id | 95-64 |
| eno | 917392 |
| sampling_feature_name | 95-64/65 |
| sampling_feature_type | field site |
| sample_type | outcrop specimen |
| sampling_method | outcrop sampling |
| material_class | rock |
| stratigraphic_unit | Cooma Metamorphic Complex |
| geological_province | Lachlan Orogen |
| sample_remark | K-feldspar metapelite gneiss. Williams 2001 paraphrased "Cordierite–andalusite–K-feldspar zone metasediment samples were collected from a deeply weathered road cut a few hundred metres inside the sillimanite isograd of Chappell and White (1976), namely at a slightly higher grade than the K-feldspar isograd, but well outside the sillimanite isograd of later workers (Johnson 1992). Pelitic and psammitic layers are clearly recognisable on an outcrop scale, but are disrupted and sinuous. Samples were taken 0.1 m apart from adjacent metapelitic (95-64) and metapsammitic (95-65) layers. The metapsammite is the finer grained, consisting mainly of quartz, biotite and minor muscovite. Rare fibrolitic sillimanite is associated with biotite, but there is no andalusite. The coarser grained metapelite is much more aluminous, consisting of quartz, biotite, muscovite, coarse poikilitic andalusite and minor K-feldspar, plagioclase and fibrolitic sillimanite. Biotite is mostly coarse grained (</= 600 um) and, in contrast to biotite in the lower grade samples, is crowded with pleochroic haloes, indicating the presence of radioactive inclusions, such as monazite and zircon. Biotite in the adjacent metapsammite contains similar haloes, but far fewer of them. Small yield and fine grainsize (<100 um) are features of the metapelite monazite. The grains are nearly colourless, high clarity, subhedral to euhedral crystals, most with well-developed crystal faces. The few tiny inclusions present are either transparent crystals or possibly trapped fluid. The grains still contain patches of complex zoning, but are dominated by relatively homogeneous monazite that coats the grains, forming their crystal faces. At this metamorphic grade, host-rock composition, and presumably fluid content and composition, has determined whether monazite continues to dissolve or begins to reprecipitate." |
| 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 | None |
| gda94_longitude | 149.057752 |
| gda94_latitude | -36.243998 |
| sample_originator | Williams, S. |
| date_acquired | 3000-01-01 00:00:00 |
| Links |
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