9655753
Persistent Identifier: https://pid.geoscience.gov.au/sample/AU9655753
| Property | Value |
|---|---|
| id | 9655753 |
| igsn | 10.60494/3f0s-da47 |
| sample_id | 95-65 |
| 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 metapsammite 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. Monazite recovery from the metapsammite was extremely small, both in size and number of grains (30 grains <50 um diameter). Delicate and irregularly shaped, embayed and with highly polished surfaces, these appear to be the last remnants of grains mostly destroyed by dissolution. Some original monazite remains, however, remnants of zoning structure still being visible in the backscattered electron images despite the dominance of thick homogeneous mantles." |
| 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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