Object # PRR-53788: Rock Sample
| Media |   | ||||||
| Primary Field # | DG12-228 | ||||||
| IGSN # | PRR053788 | ||||||
| Kind of Object | Rock Sample | ||||||
| Rock Type | Metamorphic | ||||||
| Rock Name | Gneiss | ||||||
| Alternative Rock Name | Orthogneiss | ||||||
| Sample Description | Biotite orthogneiss from 10m wide dike cutting diorite [Hagen-Peter]. Deformed biotite orthogneiss containing mystery mineral on previous page that is in cross-cutting pegmatite, but finer [Horton]. [rock sample: 1238 g; plus fractions: >425: 1240g; >355-<425 90g; <355 110g; medium-heavy: 38g; medium light: 115g; light: 188g; 1 vial Heavy Mag 20V] | ||||||
| Weight | 1238 g | ||||||
| Susceptibility | 15 x10-5 SI units | ||||||
| General Notes | See attached kml image for waypoint location. Waypoint Point 136. Isolated plug of mafic rock enveloped in granular orthogneiss and cut by multiple phases of dikes and sills. Large clasts of feldspar in diorite and small angular xenolith of orthogneiss host. Foliation in granite orthogneiss and diorite is concordant. Diorite ranges from medium equigranular to fine grained and ductiley sheared. Larger bodies of diorite are brecciated by randomly oriented dikes - primarily late stage pegmatites but also orthogneiss equivalents? Pegmatites have a strange dark oxidized, poorly translucent mineral with conchoidal fracture, hexagonal form and radial fractures in host. Northern contact of granular orthogneiss and diorite is abrupt with highly strained orthogneiss near margin [Hagen-Peter]. Orthogneiss has veins with radial clusters of translucent mineral - appears like coarse sillimanite but probably a zoisite mineral? Pegmatites and aplite dikes are garnet bearing [Horton]. | ||||||
| Continent | Antarctica | ||||||
| Region | Southern Victoria Land | ||||||
| Mountain Range/Island Group | Brown Hills | ||||||
| Mountain/Island Name | Diamond Hill | ||||||
| Coordinates | -79.899049, 159.130576 (79° 53.9' S, 159° 7.8' E) | ||||||
| Positioning Method | GPS | ||||||
| Elevation (ASL) | 295 m | ||||||
| Era | Neoproterozoic | ||||||
| Period | Ediacaran | ||||||
| Isotopic Age |
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| Analyses | U-Pb geochronology Radiogenic isotopes Sr Hf Nd Sr isotopes | ||||||
| Additional Material | Reference Geochemical data available at PetDB Geochemical data available at PetDB | ||||||
| Primary Field Logistics | Twin Otter | ||||||
| Secondary Field Logistics | Snowmobile | ||||||
| Data Sources | Field notebook Spreadsheet Publication | ||||||
| Date Collected | 2013-01-04 | ||||||
| Field Year Collected | 2013 | ||||||
| Collector | Hagen-Peter, Graham | ||||||
| Donor | Cottle, John | ||||||
| References | Graham Hagen-Peter, John Cottle, 2018, Evaluating the relative roles of crustal growth versus reworking through continental arc magmatism: A case study from the Ross orogen, Antarctica, Gondwana Research, Volume 55, Pages 153-166, https://doi.org/10.1016/j.gr.2017.11.006 Graham Hagen-Peter, John M. Cottle, 2016, Synchronous alkaline and subalkaline magmatism during the late Neoproterozoic-early Paleozoic Ross orogeny, Antarctica: Insights into magmatic sources and processes within a continental arc, Lithos, Volume 262, Pages 677-698, https://doi.org/10.1016/j.lithos.2016.07.032 |
If you would like a 3D scan of this sample, please contact the Curator.
Cite as:
The Polar Rock Repository (PRR), Byrd Polar and Climate Research Center (BPCRC), Ohio State University: Polar rock and dredge samples available for research and educational use from the PRR.
doi:10.7289/V5RF5S18 [date of access]
