Petrographic Description

Identification
    Description ID: SampleDescription
    Thin section ID: 76232
    Rock type: Sedimentary
    Core number: 1
    Box number: 0
    Well/Outcrop name: SAMPLE_WELL
    Top depth: 4000.0
    Base depth: 4000.0
    Unit/Age: SampleUnit
    Basin: SampleBasin
    Country: Brazil
    State: XX
    Place: SamplePlace
    Institution: Endeeper
    Petrographer: Karin Goldberg
    First edition date: Apr 24, 2006
    Last edition date: May 26, 2011
    Uses: Diagenetic, Provenance

Summary
    Very coarse and poorly-sorted sandstone, with abundant large plutonic fragments and garnet grains, compacted (pseudomatrix), albite, illite and some calcite cement.

Description: Image1
Purposes: General thin section view

Description: Image2
Purposes: General thin section view

Description: Image3
Purposes: General thin section view

Microscopic textural features

    Structure(s): Parallel lamination (0-1 mm)

    Texture
        Grain size range: Very fine sand (0.124 mm) to Pebble (48.0 mm)
        Modal grain size: Very coarse sand (1.12 mm)
        Gravel: 40.0%
        Sand: 60.0%
        Mud: 0.0%
        Sorting: Very poorly sorted (2.5)
        Sphericity: Low
        Roundness: Sub-angular
        Roundness modifier(s): Overgrowths, Pressure dissolution

    Fabric
        Orientation: Without orientation
        Support: Grain-supported
        Packing: Tight
        Contacts:
            Point contacts: Rare
            Long contacts: Abundant
            Concave-Convex contacts: Abundant
            Sutured contacts: Common

Primary Composition

Quartz
   30.0% Detrital quartz monocrystalline, As monomineralic grain;
   7.67% Detrital quartz monocrystalline, In plutonic rock fragment;
   2.67% Detrital quartz polycrystalline, As monomineralic grain;
   1.33% Detrital quartz polycrystalline, In plutonic rock fragment;

Feldspar
   8.67% Detrital perthite, As monomineralic grain, Altered;
   6.67% Detrital microcline, As monomineralic grain;
   6.33% Detrital orthoclase, As monomineralic grain;
   4.33% Detrital K-feldspar, In plutonic rock fragment;
   2.33% Detrital plagioclase, As monomineralic grain, Twinned;
   1.0% Detrital plagioclase, As monomineralic grain, Untwinned;
   0.33% Detrital plagioclase, In plutonic rock fragment;

Rock fragments
   0.0%

Accessories
   2.33% Biotite, As monomineralic grain, Compacted between other detritic grains.;
   1.33% Garnet, As monomineralic grain;
   0.67% Muscovite, In plutonic rock fragment;
   0.33% Epidote, As monomineralic grain;

Intrabasinal grains
   1.33% Argillaceous mud intraclast;

Matrix
   0.0%

Diagenetic Composition
   5.33% Albite, Microcrystalline, Intragranular replacive, Replacing <Primary-Constituent>, Detrital K-feldspar, As monomineralic grain;
   1.33% Albite, Prismatic, Intragranular replacive, Replacing <Primary-Constituent>, Detrital plagioclase, As monomineralic grain;
   1.33% Albite, Microcrystalline, Intragranular replacive, Replacing <Primary-Constituent>, Detrital plagioclase, As monomineralic grain;
   0.33% Albite, Outgrowth, Intergranular discrete, Overgrowing <Primary-Constituent>, Detrital plagioclase;
   0.33% Albite, Outgrowth, Intergranular discrete, Overgrowing <Primary-Constituent>, Detrital plagioclase, As monomineralic grain;
   2.33% Clay pseudomatrix, Microcrystalline, Intergranular pore-filling, Compacted from <Primary-Constituent>, Argillaceous mud intraclast, In intrabasinal fragment;
   1.33% Illite, Fibrous, Intergranular replacive, Replacing <Diagenetic-Constituent>, Clay pseudomatrix, Intergranular pore-filling;
   1.0% Illite, Fibrous, Intragranular replacive, Replacing <Primary-Constituent>, Mud intraclast;
   0.67% Illite, Fibrous, Intragranular pore-filling, Within intragranular porosity in <Primary-Constituent>, Mud intraclast;
   0.67% Illite, Fibrous, Intergranular pore-filling, Within <pore>, Clay pseudomatrix;
   0.33% Illite, Fibrous, Intergranular discontinuous pore-lining, Covering <Primary-Constituent>, Detrital plagioclase, As monomineralic grain;
   0.33% Illite, Fibrous, Intergranular pore-filling, Within <pore>, Intergranular pore;
   0.33% Calcite, Small rhomb, Intragranular replacive, Replacing <Primary-Constituent>, Biotite, As monomineralic grain;
   0.33% Siderite, Small rhomb, Intragranular replacive, Replacing <Primary-Constituent>, Biotite, As monomineralic grain;
   0.33% Calcite, Poikilotopic, Intragranular replacive, Replacing <Primary-Constituent>, Primary constituent undifferentiated, As monomineralic grain;
   0.33% Dolomite, Small rhomb, Intergranular replacive, Replacing <Diagenetic-Constituent>, Clay pseudomatrix;
   0.33% Diagenetic titanium mineral, Microcrystalline, Intragranular pore-filling, Within intragranular porosity in <Primary-Constituent>, Mud intraclast;
   0.33% Diagenetic titanium mineral, Microcrystalline, Intragranular replacive, Replacing <Primary-Constituent>, Biotite, As monomineralic grain;
   0.33% Diagenetic titanium mineral, Coarsely-crystalline, Intergranular pore-filling, Within <pore>, Intergranular pore;
   0.33% Quartz, Overgrowth, Intergranular discontinuous pore-lining, Covering <Primary-Constituent>, Detrital quartz monocrystalline, As monomineralic grain;

Porosity
   2.0% Intragranular pore, Framework, Dissolution of <Primary-Constituent>, Detrital K-feldspar, As monomineralic grain;
   1.33% Intergranular pore, Interstitial, Primary, Intergranular pore;
   0.67% Intragranular pore, Framework, Dissolution of <Primary-Constituent>, Mud intraclast;
   0.33% Intragranular pore, Framework, Within <Primary-Constituent>, Biotite, As monomineralic grain;
   0.33% Intergranular pore, Interstitial, Dissolution of <Diagenetic-Constituent>, Clay pseudomatrix;

Additional Analysis

    Petrophysics
        Horizontal petrophysical porosity (%): 9.99
        Horizontal permeability (mD): 0.322

Classification

   Folk Original: Arkose
       Qo Folk: 39.84632
       Fo Folk: 60.15368
       Lo Folk: 0.0

Provenance Interpretation

   Dickinson I Original: Basement uplift - continental block
       Qt Dickinson I Original: 51.242004
       F Dickinson I Original: 48.75799
       L Dickinson I Original: 0.0

Diagenetic Environment Interpretation

Interpreted Diagenetic Environments
Siliciclastic environment of deep burial diagenesis (deep mesodiagenesis)

Total

Volumes
Framework	91.7
Intergranular	8.3
Cement	2.65
Matrix	0.0
Porosity	4.66
Microporosity	5.33
Total diagenetic constituents	17.95
Rigid grains	72.99
Ductile grains	4.33
Extrabasinal constituents
Total extrabasinal constituents	76.66
Extrabasinal grains	76.66
Detrital quartz	32.67
Detrital feldspar	25.0
Plutonic rock fragments	14.33
Volcanic rock fragments	0.0
Sedimentary rock fragments	0.0
Carbonate rock fragments	0.0
Metamorphic rock fragments	0.0
Detrital matrix	0.0
Intrabasinal constituents
Total intrabasinal constituents	3.33
Present primary carbonate constituents	0.0
Original primary carbonate constituents	0.0
Intrabasinal grains	1.33
Present carbonate allochems	0.0
Original carbonate allochems	0.0
Primary proportion of original carbonate allochems	0.0
Carbonate bioclasts	0.0
Carbonate intraclasts	0.0
Carbonate ooids	0.0
Carbonate peloids/pellets	0.0
Original bioconstructers	0.0
Present carbonate bioconstructors	0.0
Original carbonate bioconstructors	0.0
Primary proportion of original carbonate bioconstructors	0.0
Present carbonate matrix	0.0
Original carbonate matrix	0.0
Primary proportion of original carbonate matrix	0.0
Carbonate cement	0.0
Present intrabasinal non-carbonate grains	1.33
Original intrabasinal non-carbonate grains	3.33
Dolomite/Calcite ratio	0.5

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