Core data from the Ocean Drilling Program legs 101-129

                ODP hard-rock thin section description - verbose form
   leg :  103                section:  CC       unit/subunit :
   hole: 639F                top int: 001 cm    observer code:  GIR
   core: 002R                 pieces: 999

       rock name: Quartzite
         texture: Slightly foliated


     grain size: 0.1-0.4 mm 

                        ***** PHENOCRYSTS *****





                        ***** GROUNDMASS *****
Interlocking grains, slightly flattened. 
Quartz                 present %  95    original %  95     size 0.1-0.4
                         ****** VESICLES *****
Type: Vesicles   %: 0

                ****** SECONDARY MINERALIZATION ******
mineral name:                            percent:  
      replacement: 
      comments   : 
                     ****** OVERALL COMMENTS ******
Fine grained quartzite with weak foliation. Quartz is slightly strained. 
Interstitial matrix: mostly clays, some chlorite, a few muscovite flakes (very 
rare, broken). Rock has been fractured, recrystallized (fine grained). No piece 
number given. 

                ODP hard-rock thin section description - verbose form
   leg :  103                section:  CC       unit/subunit :
   hole: 639F                top int: 009 cm    observer code:  GIR
   core: 002R                 pieces: 999

       rock name: Altered silicic, volcanic?
         texture: Altered porphyritic


     grain size: 0.2 - 1 mm 

                        ***** PHENOCRYSTS *****
Feldspar                  present %  15    original % 15      size 0.4-1.5   

           morphology : Euhedral-Subhedral
           comments   : Mostly altered, both K (sanidine?) and Na 
                        (albite,small laths) spar, relatively sericitized. 

                        ***** GROUNDMASS *****

Altered Groundmass     present %  80    original %  80     size N/A
                         ****** VESICLES *****
Type: Vesicles   %: 0

                ****** SECONDARY MINERALIZATION ******
mineral name:  Chlorite                  percent:  1
      replacement: 
      comments   : Minor 
                     ****** OVERALL COMMENTS ******
Relatively phenocryst rich (20-25%). Radiating bundles of gray phyllosilicate(?). 
 Also muscovite laths and broken laths. No piece number given. 

                ODP hard-rock thin section description - verbose form
   leg :  103                section:  CC       unit/subunit :
   hole: 639F                top int: 018 cm    observer code:  GIR
   core: 002R                 pieces: 999

       rock name: Altered silicic volcanic (rhylolite - dacite)
         texture: Porphyritic


     grain size: 0.2 -1.0 mm 

                        ***** PHENOCRYSTS *****
Quartz                    present %  N/A   original % N/A     size N/A       

           morphology : Rounded


                        ***** GROUNDMASS *****

N/A                    present %  N/A    original %  N/A     size N/A
                         ****** VESICLES *****
Type: Vesicles   %: 0

                ****** SECONDARY MINERALIZATION ******
mineral name:  Chlorite                  percent:  1
      replacement: 
      comments   : 
                     ****** OVERALL COMMENTS ******
Groundmass is completely altered. Similar to 639F-2R-CC-9-11cm. No piece number 
was given, 999 is a dummy value. 

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These Web pages are from the Core Data from the Ocean Drilling Program Legs 101-129 CD-ROM produced in 2001 by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, National Geophysical Data Center, and collocated World Data Center for Marine Geology and Geophysics, Boulder. Data were compiled in cooperation with the U.S. Science Support Program, the Joint Oceanographic Institutions, Inc., and the U.S. National Science Foundation. Please see the NGDC privacy, disclaimer, and copyright notices. Additional ocean drilling data are available from NGDC and from the ODP/IODP.

questions to: carla.j.moore@noaa.gov