Accessory mineral behaviour during partial melting in the crust - improving the geochronology of granulite terrains.
Metadata record for data expected ASAC Project 2690 See the link below for public details on this project. Relating ages, determined using the decay of radioactive elements in minerals, to geological events is central to understanding mountain building and continental evolution. This research will u...
| Other Authors: | , , , , |
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| Format: | Dataset |
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Australian Antarctic Data Centre
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| Online Access: | https://researchdata.ands.org.au/accessory-mineral-behaviour-granulite-terrains/699988 https://doi.org/10.4225/15/57ABDFA914A47 https://data.aad.gov.au/metadata/records/ASAC_2690 http://nla.gov.au/nla.party-617536 |
| Summary: | Metadata record for data expected ASAC Project 2690 See the link below for public details on this project. Relating ages, determined using the decay of radioactive elements in minerals, to geological events is central to understanding mountain building and continental evolution. This research will use carefully sampled rocks from Antarctica to improve current estimates of the distribution of elements that occur at only trace (parts per million) concentrations between the key mineral used in dating, zircon, and the common mineral garnet. This information will then be used to link zircon ages to the major events and processes that occurred during the assembly of ancient pieces of crust to form what is now East Antarctica, and other continents. Accessory mineral behaviour during partial melting in the crust - improving the geochronology of granulite terrains (ASAC_2690) The aim of this project was to collect geological material appropriate for evaluating the chemical signatures of the minerals zircon, monazite and garnet formed during various stages of partial melting, melt accumulation and melt extraction in rocks undergoing deformation and metamorphism at high grades. A second objective was to collect gneisses in which the mineral record of early metamorphic events might be clarified in the complex Prydz Bay region. Geologists SL Harley, NM Kelly and T Hokada undertook field work over the period 21 December 2006 to 2 March 2007. Samples were collected by the usual techniques, using hammer and chisel, and documented in the field using sketches, photographs and GPS. Sampling was complemented by detailed outcrop- and larger-scale mapping centred on defining the precise relationships between the rocks and mineral sites sampled. Localites / areas visited, mapped and sampled included the Larsemann Hills (Broknes Peninsula, Stornes Peninsula, McLeod Island, Manning Island), Steinnes, the Brattstrand Bluffs coast, the Rauer Group (Torckler, Varyag, Tango, Pchelka, Lunnyy, Sapozhok Islands; Mather and Macey Peninsulas), and two subareas in the Vestfold Hills (Taynaya Bay, Pioneer Crossing). The data set consists of an excel workbook containing three spreadsheets. The three spreadsheets provide listings of the geological rock samples collected during the course of fieldwork by SL Harley, NM Kelly and T Hokada respectively. Each sheet provides sample numbers/codes, locations by name (and by code name if used in the collectors field notebook) and by latitude and longitude given in terms of degrees and decimalised minutes. Each sample is also described in terms of its mineralogy, some aspects of its structural or relational setting, and purpose for collection. Sample numbers are described in the following way: The letters are the initials of the collector (sh, TH, NK) and the sample number is usually of the form year/num e.g. 06/45. The abbreviations used on the worksheets in the Excel spreadsheet are: Harley Sheet: Crd, Li-B: Li and B analysis of cordierite U-Pb, chem: geochemistry and U-Pb dating Zrc-Mon: zircon and monazite phase and chemical relations P-T: pressure and temperature calculations P-T-Ky: pressure and temperature calculations and evaluation of relict kyanite csil P-T-fluid: pressure, temperature and fluid composition calculations on calcsilicate mineral assemblage Kelly sheet: Acc / Gx: accessory mineral behaviour and geochronology Acc / Grt comp: accessory mineral / garnet relations and REE distributions Acc / Min: mineralogy of complex accessory phases Grt REE comp: composition of garnet in terms of trace elements Gx: geochronology Acc / Pet: petrology, pressure-temperature calculations and accessory mineral stability Pet: petrology and pressure-temperature calculations Kelly Mineral Assemblage abbreviations Bt biotite Cc calcite Cpx clinopyroxene Crd cordierite Diop diopside Fsp felsspar Grs grossular garnet Grt garnet Hbl hornblende Ilm ilmenite Kfs K-feldspar Krn kornerupine / prismatine Ky kyanite Mnz monazite Opq opaque Opx orthopyroxene Pl plagioclase Qtz quartz Scap scapolite Sil sillimanite Spl spinel Spr sapphirine Woll wollastonite Zrc zircon Hokada sheet: U-Pb zrn: zircon U-Pb geochronology The fields in this dataset are: Sample Number Location Name Date Location Code Latitude Longitude Field Description Collected For Additional Notes |
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