2678310
Persistent Identifier: https://pid.geoscience.gov.au/sample/AU2678310
| Property | Value |
|---|---|
| id | 2678310 |
| igsn | 10273/AU2678310 |
| sample_id | NSWSJAF0174.01A |
| eno | 621277 |
| sampling_feature_name | DD12NV0016 |
| sampling_feature_type | borehole |
| sample_type | core |
| sampling_method | core diamond |
| material_class | rock |
| stratigraphic_unit | None |
| geological_province | Cobar Basin |
| sample_remark | This sample of coarse-grained granite was taken from diamond drillhole DD12NV0016 (445.05-445.75 m). It has S-type chemistry, and comprises quartz, K-feldspar, plagioclase and biotite. The granite is pervasively altered, with widespread replacement of plagioclase by sericite, local development of a weak sericitic foliation, and minor scheelite-bearing veins hosted by greisenised granite. This pluton intrudes brecciated and sheared siltstones of the earliest Devonian Shume Formation, in the Amphitheatre Group of the Cobar Supergroup (MacRae, 1987), and is associated with extensive tourmaline-rich alteration of the host rocks. Primary skarn mineralisation is of calcic iron–copper type, and although it is best characterised in a drillhole several kilometres NW of DD12NV0016, the skarn chemistry is consistent with a causative pluton of I-type composition at depth (Fitzherbert et al., 2017), similar to the quartz diorite sampled at 159.75-162.0 m in this drillhole. This S-type granite, and a cordierite-biotite granite higher in DD12NV0016 (336.4-338.1 m), are not genetically related to skarn mineralisation (Fitzherbert et al., 2017). In thin section, this coarse-grained granite features interlocking subhedral laths of K-feldspar and plagioclase up to 10 mm long, within a finer-grained matrix dominated by recrystallised quartz. Former igneous biotite is completely replaced by intergrowths of chlorite, white mica and opaque oxide minerals. Feldspars are locally replaced by muscovite. This granite is moderately deformed: quartz is completely recrystallised into a fine-grained equigranular matrix, feldspars are fractured, and chlorite-rich aggregates define a wispy foliation. |
| earth_materials | Y |
| 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 | 145.9908502 |
| gda94_latitude | -32.1890282 |
| sample_originator | Geological Survey of New South Wales (GSNSW) |
| date_acquired | 2017-08-30 00:00:00 |
| Links |
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