2771370
Persistent Identifier: https://pid.geoscience.gov.au/sample/AU2771370
| Property | Value |
|---|---|
| id | 2771370 |
| igsn | 10273/AU2771370 |
| sample_id | ERIVKFB0513.01 |
| eno | 628571 |
| sampling_feature_name | H-12 |
| sampling_feature_type | borehole |
| sample_type | half core |
| sampling_method | core diamond |
| material_class | rock |
| earth_materials | Y |
| stratigraphic_unit | Hickory Hill Diorite |
| geological_province | Central NSW - Omeo Province |
| sample_remark | Drillhole H-12 was drilled to a depth of 34 m (comprising 32.5 m of alluvial cover, followed by a 1.5 m diamond drillcore 'tail' from bedrock) by Samedan of Australia, to test the Hickory Hill tin-tungsten prospect (Taylor, 1982; 1983), 5 km SE of the abandoned locality of Ryan, and 13 km WSW of the intersection of the Henty-Walla Road with the Olympic Highway. The exact location of H-12 is not known; however, Taylor (1982) described the hole (which intersected diorite) as testing 'a linear magnetic feature west of Hickory Hill', and bedrock geology maps interpreted by Taylor (1983) show diorite dykes at this location. The bedrock unit, sampled at 32.5-33.8 m, comprises massive, seriate-textured (0.5-7.0 mm) hornblende quartz diorite now known as the Hickory Hill Diorite. In thin section, plagioclase is zoned, twinned, and weakly sericite-altered. Quartz is interstitial between plagioclase crystals. Biotite is medium-grained and altered to chlorite. Amphibole has brown pleochroism, is commonly twinned, has good cleavages, and is altered to chlorite. Opaque oxide minerals (probably magnetite) are coarse-grained, and range from euhedral cubes to anhedral crystals. The intrusion is not exposed at the surface, but has high magnetic response in geophysical images. It forms an elongate N-S body 10 km long, which occupies a fault along the W margin of the 412.6 +/- 2.5 Ma I-type Wallandoon Ignimbrite (ERIVKFB0141.01) of the Culcairn Group. The diorite was targeted for U-Pb SHRIMP zircon dating to establish a likely minimum age for tin-tungsten mineralisation at Hickory Hill, which will complement the maximum age imposed by the host 430.5 +/- 3.4 Ma 'Mount Royal granite' (Waltenberg et al., 2019) intersected in nearby drillhole H-25 (Taylor, 1983). Dating the Hickory Hill Diorite will also establish its relationship to nearby I-type magmatic rocks, including the Wallandoon Ignimbrite and the 407.4 +/- 1.9 Ma Mullengandra Monzodiorite (ERIVKFB0327.01). |
| structural_measurements | None |
| inorganic_geochemistry | Y |
| organic_geochemistry | None |
| geochronology | Y |
| isotope_groups | None |
| hydrochemistry | None |
| rock_properties | None |
| mineralogy | None |
| thin_sections | None |
| repository_samples | Y |
| mineral_deposit_samples | None |
| mineral_deposit_waste_samples | None |
| linked_files | None |
| other_geological_data | None |
| project_name | None |
| gda94_longitude | 146.905211 |
| gda94_latitude | -35.590327 |
| sample_originator | Geological Survey of New South Wales (GSNSW) |
| date_acquired | 2018-05-11 00:00:00 |
| Links |
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