7935607
Persistent Identifier: https://pid.geoscience.gov.au/sample/AU7935607
| Property | Value |
|---|---|
| id | 7935607 |
| igsn | 10273/AU7935607 |
| sample_id | MSH192 |
| eno | 816981 |
| sampling_feature_name | R010878 |
| sampling_feature_type | field site |
| sample_type | outcrop specimen |
| sampling_method | outcrop sampling |
| material_class | rock |
| earth_materials | Y |
| stratigraphic_unit | Mount Pearson Granite |
| geological_province | Northeast Tasmania Element |
| sample_remark | McClenaghan & Higgins (1993): The Mt Pearson intrusive phase (SampleIDs 40525-1 & 2, 40529, MP1, MBT241 & 242, MSH174 & 176, MSH179-1 & 2, MSH180 & 192) shows a range of biotite K-Ar ages (averaged K-Ar age 386.0 +/- 1.2 Ma), which is puzzling as the younger ages do not appear to be close to later intrusions and are unlikely to have been reset. Sample MSH176, closest to the younger Poimena pluton, has an older age (~391 Ma) for the phase, whereas MP1 lies at a greater distance and has a younger age (~375 Ma). Sample MSH176 also from close to the later Scamander Tier phase intrusion, is older than samples more distant such as MSH180. Samples MP1 and MBT241 differ considerably in age though they came from the same part of the Mt Pearson body. The anomalous variations in age may be related to metasomatic alteration since the southern margin of the Mt Pearson pluton shows metasomatic alteration. The very coarse grain size of the Mt Pearson pluton may have facilitated the passage of metasomatic fluids. The hydrothermal fluids from the Mt Pearson pluton also produced the zoned mineralisation of the Scamander Mineral field in the southern area. N & W of St Helens, the large biotite monzogranite mass (Mt Pearson pluton) postdates the George River pluton. The order of intrusion is demonstrated in the Launceston Creek area west of St Helens where quartz and feldspar pegmatitic patches, present in the marginal monzogranite of the Mt Pearson body, intrude as thin veins into the George River granodiorite. The truncation of the mafic mineral foliation in the George River and the Gardens bodies by the Mt Pearson mass also indicates that the latter postdates both bodies. The western part of the Mt Pearson pluton is cut by a north-south fault and forms north and south extensions of the body. |
| 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 | 148.1883585 |
| gda94_latitude | -41.3502097 |
| sample_originator | Waltenberg, K. |
| date_acquired | 2000-01-01 00:00:00 |
| Links |
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