Heavy Mineral Calculation.ppt

• Pengolahan Data

Data frekuensi tiap jenis mineral pada sampel suatu lokasi

Kyan Gar Hornbl Mag Andal Ap Ilm JUML NO it net ende netit usit atit enit AH 1 6 24 14 11 5 60 2 4 8 21 10 12 3 2 60 3 4 28 12 9 4 3 60 4 8 5 19 15 7 6 60 5 5 28 11 10 4 2 60 JUM 300 LAH

2. Persentase tiap mineral Frekuensi tiap mineral x100% % = jumlah total partikel (n=300) 3. Simpangan Baku • menggunakan diagram Van der Plas • nilai persentase tiap mineral dan frekuensi total menjadi variabel x dan y

Van der Plas Chart (Van der Plas & Tobi, 1965)

NO

MINERAL

FREKUENSI

PERSENTASE

SIMPANGAN

%

BAKU

NILAI TERKOREKSI +

-

6

2

1

Kyanit

12

4

2

Garnet

28

9.33

3

12.33

6.33

3

Hornblende

120

40

6

46

34

4

Magnetit

62

20.67

5

25.67

15.67

5

Andalusit

49

16.33

4

20.33

12.33

6

Apatit

16

5.33

3

8.33

2.33

7

Ilmenit

13

4.33

2

6.33

2.33

300

100

JUMLAH

2

4. Histogram a. histogram frekuensi b. histogram koreksi + c. histogram koreksi -

4. Histogram a. Histogram Frekuensi

Hornblende Garnet Magnetit Andalusit

Ilmenit Apatit  Kesimpulan

: Igneous rock, High rank metamorphic (Pettijohn,1948) : higher-grade metamorphic : higher-grade metamorphic, acid igneous, basic igneous : higher-grade metamorphic, lower-grade metamorphic : basic igneous : acid igneous : higher-grade metamorphic

b. Histogram Koreksi +

Hornblende Garnet Magnetit Andalusit

Ilmenit Apatit  Kesimpulan

: Igneous rock, High rank metamorphic (Pettijohn,1948) : higher-grade metamorphic : higher-grade metamorphic, acid igneous, basic igneous : higher-grade metamorphic, lower-grade metamorphic : basic igneous : acid igneous : higher-grade metamorphic

c. Histogram Koreksi -

Hornblende Garnet Magnetit

Andalusit Ilmenit Apatit 



: Igneous rock, High rank metamorphic (Pettijohn, 1948) : higher-grade metamorphic : higher-grade metamorphic, acid igneous, basic igneous : higher-grade metamorphic, lower-grade metamorphic : basic igneous : acid igneous

Interpretasi provenans: basic igneous - highergrade metamorphic

Kesimpulan : higher-grade metamorphic