Search Help
Global Change Master Directory (GCMD)
Accessory mineral behaviour during partial melting in the crust - improving the geochronology of granulite terrains.
Entry ID: ASAC_2690


Summary
Abstract: 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

Related URL
Link: View Related Information
Description: Download point for the data - Excel Spreadsheet


Link: View Related Information
Description: Public information for ASAC project 2690


Link: View Related Information
Description: Citation reference for this metadata record and dataset

Geographic Coverage
 N: -68.0 S: -68.408  E: 78.398  W: 76.0046

Data Set Citation
Dataset Creator: Harley, S., Kelly, N.M. and Hokada, T.
Dataset Title: Accessory mineral behaviour during partial melting in the crust - improving the geochronology of granulite terrains.
Dataset Series Name: CAASM Metadata
Dataset Release Date: 2012-05-08
Dataset Publisher: Australian Antarctic Data Centre
Online Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...


Temporal Coverage
Start Date: 2006-12-24
Stop Date: 2007-03-02


Location Keywords
CONTINENT > ANTARCTICA > Davis
CONTINENT > ANTARCTICA > Rauer Islands
CONTINENT > ANTARCTICA > Prydz Bay
CONTINENT > ANTARCTICA > Larsemann Hills
CONTINENT > ANTARCTICA > Vestfold Hills
GEOGRAPHIC REGION > POLAR


Science Keywords
SOLID EARTH >GEOCHEMISTRY >GEOCHEMICAL PROPERTIES >ISOTOPES    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >TECTONIC LANDFORMS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >ELEMENTS >RADIOACTIVE ELEMENTS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >AGE DETERMINATIONS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >METAMORPHIC ROCKS    [Definition]
SOLID EARTH >TECTONICS    [Definition]


Platform
FIELD SURVEYS    [Information]


Access Constraints
Digital data from this project are publicly available for download from the provided URL.
The actual rock samples are stored at:

Grant Institute of Earth Science
University of Edinburgh
Kings Buildings
West Mains Road
Edinburgh EH9 3JW
UK

However, the collection made by Hokada (sheet: Hokada) is to be stored at the National Institute of Polar Research, Tokyo:

National Institute of Polar Research
1-9-10 Kaga, Itabashi,
Tokyo 173-8515
JAPAN


Use Constraints
This data set conforms to the PICCCBY Attribution License (http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2690 when using these data.


Keywords
radioactive
continental evolution
mountain building
metamorphism
isotopes
tectonics
geochronology
melting
zircon
garnet
cordierite
Location
Date
Latitude
Longitude


Data Set Progress
COMPLETE


Originating Center
Australian Antarctic Division


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 42 kb
Distribution_Format: Excel
Fees: free


Personnel
SIMON HARLEY
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +44 131 650 4839
Fax: +44 131 650 7340
Email: simon.harley at ed.ac.uk
Contact Address:
Earth and Planetary Science
University of Edinburgh
Grant Institute, The Kings Buildings
James Hutton Road
City: Edinburgh
Province or State: Scotland
Postal Code: EH9 3JW
Country: United Kingdom


NIGEL M KELLY
Role: TECHNICAL CONTACT
Email: nigel.kelly at colorado.edu
Contact Address:
University of Colorado
Department of Geological Sciences
2200 Colorado Avenue
City: Boulder
Province or State: Colorado
Postal Code: 80309
Country: USA


TOMOKAZU HOKADA
Role: TECHNICAL CONTACT
Phone: +81-42-512-0714
Email: hokada at nipr.ac.jp
Contact Address:
10-3, Midori-cho
City: Tachikawa-shi
Province or State: Tokyo
Postal Code: 190-8518
Country: JAPAN


DAVE J. CONNELL
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia


Extended Metadata Properties
(Click to view more)

Creation and Review Dates
DIF Creation Date: 2006-07-27
Last DIF Revision Date: 2018-07-10



-->