[Parameters: Topic='SOLID EARTH', Term='TECTONICS', Variable_Level_1='PLATE TECTONICS']
The strength of the lower continental crust; evidence from the Stillwell Hills-Oygarden Group Coastline.Entry ID: ASAC_1150
Abstract: The nature of the data were lithological and structural geological mapping, in addition to the collection of relevant geological specimens. The quality of the data collected ranges from detailed form surface mapping in the Oygarden Islands and locally in the Broka-Havstein and Stillwell Hills areas, to regional mapping in the majority of the latter two regions. The main episode of the high grade ... deformation preserved in the area occurred during the c.950Ma Rayner Structural Episode, a collisional event which affected large areas of Enderby, Kemp, MacRoberston Lands and the northern Prince Charles Mountains. In the Oygardens this deformation occurred in the middle to lower crustal levels, while the section through the Broka-Havstein, through to the Stillwell Hills, is thought to represent a continuation of this crustal section as a tilted crustal block, moving stratigraphicallly higher towards the Stillwell Hills. Work in the Oygarden Group has shown that at these deep crustal levels, lithology can be heterogeneous, and deformation varied, which opposes conventional ideas of lithological and rheological homogeneity, and a constant deformation style. With movement eastwards to the Stillwell Hills this work revealed differences in deformation style as one moves through the crustal levels, with deformation dominated by a more homogeneous deformation style of superposed penetrative deformation events. Geological samples will be used to constrain the nature of the mineral assemblages and fluid present during metamorphism, as well as study on the pressures and temperatures of metamorphism, and the phase relationships which developed throughout the metamorphic evolution of the belt.
In May of 2008, two new files were added to the dataset - a pdf copy of the original field notes taken in the Stillwell Hills during the project (SWHfieldbook2002_Halpin1.pdf), plus a new excel spreadsheet which is an attempt to bring together all the Stillwell Hills spreadsheets in the dataset (Halpin_StillwellHills_FieldData.xls).
In March of 2009, the excel spreadsheet, Halpin_StillwellHills_FieldData.xls, was replaced by a series of shapefiles (in the folder StillwellHills_FieldData).
The shapefile of the field sites data contains the following fields:
SITE: Individual site number/reference for location - corresponds to original hand-drawn maps and entries in the geologist's notebook.
OBS: Unique observation identification tag related to the SITE number - there may be several OBS entries for a single SITE, which may include several descriptions of rock types, measurements etc.
SAMPLE: Sample number if a sample was collected.
GEOLOGIST: The name of the geologist that recorded the observation/sample/measurement etc.
DATE_: The date of the recorded observation/sample/measurement etc.
ROCK_TYPE: Lithology type at the specified location
DESCR: Description of lithology type/mineralogy/sample/structural information etc.
FOLIATION: Inferred foliation type/generation (where S1=first generation foliation related to D1 deformation, S2=second generation foliation related to D2 deformation, S2/3= transposition of S2 foliation during D3 deformation etc, AP=axial plane.
STRIKE: Strike/trend of foliation (measured from north) in degrees.
DIP: Dip of foliation (measured from horizontal) in degrees.
DIP_DIR: Dip direction of foliation, allows DIP to be a unique direction.
LINEATION: Inferred lineation or fold axis generation (where L1=first generation lineation related to D1 deformation, L2=second generation lineation related to D2 deformation, L2/3= transposition of L2 lineation during D3 deformation etc, F1=first generation fold axis related to D1 deformation, F2=second generation fold axis related to D2 deformation, F2/3= transposition of F2 fold axis during D3 deformation etc.)
PLUNGE: Plunge of the lineation/fold axis (measured from horizontal) in degrees.
PLUNGE_DIR: Plunge/trend direction of the lineation/fold axis (measured from north) in degrees.
The data for this project is the same as that for ASAC_2214.
The fields in this dataset are:
The mineral assemblage code abbreviations are as follows:
Ksp= alkali feldspar
Pl (or plag)= plagioclase
The foliation codes begin with an 'S' which just means the measurement is a foliation, and then is followed by a number to indicate which deformation event the foliation records, hence S1, S2, S3 etc.
The lineation data are much the same however they begin with an 'L' followed by a number.
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: Please See Summary
Dataset Title: Historic Core Data from the Ocean Drilling Program (ODP) Legs 101-129
Dataset Series Name: World Data Center for Marine Geology and Geophysics, Boulder, Seafloor Series
Dataset Release Date: 2001
Dataset Release Place: Boulder, CO
Dataset Publisher: Please See Summary
Issue Identification: Please See Summary
Data Presentation Form: Tabular Digital DataOnline Resource: http://www.ngdc.noaa.gov/mgg/fliers/01mgg02.html
Start Date: 1984-01-01Stop Date: 1990-12-31
OCEANS > MARINE SEDIMENTS > GEOTECHNICAL PROPERTIES
OCEANS > MARINE SEDIMENTS > SEDIMENT COMPOSITION
OCEANS > MARINE SEDIMENTS > SEDIMENTARY TEXTURES
OCEANS > MARINE SEDIMENTS > SEDIMENTATION
OCEANS > MARINE SEDIMENTS > STRATIGRAPHIC SEQUENCE
PALEOCLIMATE > OCEAN/LAKE RECORDS > ISOTOPES
PALEOCLIMATE > OCEAN/LAKE RECORDS > MACROFOSSILS
PALEOCLIMATE > OCEAN/LAKE RECORDS > MICROFOSSILS
PALEOCLIMATE > OCEAN/LAKE RECORDS > PALEOMAGNETIC DATA
PALEOCLIMATE > OCEAN/LAKE RECORDS > SEDIMENTS
PALEOCLIMATE > OCEAN/LAKE RECORDS > STRATIGRAPHIC SEQUENCE
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > ELEMENTS > MAJOR ELEMENTS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > ELEMENTS > MINOR ELEMENTS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > ELEMENTS > TRACE ELEMENTS
SOLID EARTH > GEOMAGNETISM > PALEOMAGNETISM
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > AGE DETERMINATIONS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > IGNEOUS ROCKS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > METAMORPHIC ROCKS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTARY ROCKS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTS
OCEANS > MARINE SEDIMENTS > SEDIMENT CHEMISTRY
PALEOCLIMATE > OCEAN/LAKE RECORDS > BOREHOLES
Access Constraints ACCESS CONSTRAINTS: No Constraints
DISTRIBUTION LIABILITY: Disclaimer While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
CUSTOM ORDER PROCESS: Contact data center for information
Use Constraints None
Data Set Progress
Distribution Size: 600.000000
Distribution Format: ASCII
Fees: free online download, contact data center for information on the CD-ROM.
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: (303) 497-6339
Fax: (303) 497-6513
Email: Carla.J.Moore at noaa.gov
NOAA/NESDIS/NGDC 325 Broadway
Province or State: CO
Postal Code: 80305-3328
Creation and Review Dates
DIF Creation Date: 2010-01-22
Last DIF Revision Date: 2011-03-08
Future DIF Review Date: 2011-04-01