7935683
Persistent Identifier: https://pid.geoscience.gov.au/sample/AU7935683
| Property | Value |
|---|---|
| id | 7935683 |
| igsn | 10273/AU7935683 |
| sample_id | Yolla 1 2612-2621 m |
| eno | 17271 |
| sampling_feature_name | Yolla 1 |
| sampling_feature_type | borehole |
| sample_type | drill chips/cuttings |
| sampling_method | drilling |
| material_class | rock |
| earth_materials | Y |
| stratigraphic_unit | None |
| geological_province | Bass Basin |
| sample_remark | The rock is a medium to fine grained gabbro, with a grain size ranging from 3 to 0.3 mm. The primary mineral components, in decreasing order of abundance, are clinopyroxene, plagioclase, hornblende, biotite, magnetite and apatite. Plagioclase occurs as generally tabular grains and is extensively altered to sericite, zoisite/epidote, calcite and chlorite. Faint albite twinning can still be distinguished and occasional marginal zones or rims of slightly different composition can be seen. The ferromagnesian minerals are generally fresh. The amphibole, a dark red-brown variety, appears in places to be replacing pyroxene but elsewhere, occurs as discrete grains with euhedral shape and well developed twinning. Biotite is also a reddish-brown variety and is generally unaltered. Both biotite and hornblende could be used for K-Ar dating but the biotite may prove easier to concentrate. Patches of a fibrous, colourless zeolite mineral are also present. Apart from the alteration of the plagioclase, the rock is fresh and shows no sign of strain. A K-Ar date on biotite or hornblende should give the age of crystallisation of this gabbro. |
| 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 | 145.807052 |
| gda94_latitude | -39.837061 |
| sample_originator | Waltenberg, K. |
| date_acquired | 2000-01-01 00:00:00 |
| Links |
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