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BAB IV
PENGOLAHAN DATA
4.1 Analisis Mineral Berat
Mineral
Frekuensi
Presentase (%)
Simpangan Baku
Nilai Terkoreksi
+ -
Magnetit 155 51,67 5,8 57,47 45,87
Hornblende 47 15,67 4,6 20,27 11,07
Biotit 23 7,67 3,5 11,17 4,17
Plagioklas 13 4,33 2,6 6,93 1,73
Kyanit 7 2,33 1,8 4,13 0,53
Pirit 4 1,33 1 2,33 0,33
Piroksen 5 1,67 1,3 2,97 0,37
Hematit 10 3,33 2,2 5,53 1,13
Olivin 2 0,67 0,2 0,87 0,47
Zircon 6 2 1,9 3,9 0,1
Andalusit 28 9,3 3,7 13 5,6
Jumlah 300 100 28,6 128,77 71,37
Magneti
t
Hornblen
deBiotit
Plagiokla
sKya
nitPirit
Pirokse
n
Hemati
tOliv
inZir
con
Andalusit
0
20
40
60
80
100
120
140
160
180
Histogram Berdasarkan Frekuensi
Series1
Frek
uens
i
Magneti
t
Hornblen
deBiotit
Plagiokla
sKya
nitPirit
Pirokse
n
Hemati
tOliv
inZir
con
Andalusit
0
10
20
30
40
50
60
Histogram Mineral Terhadap Nilai Terkoreksi (+)
Series1
Magneti
t
Hornblen
deBiotit
Plagiokla
sKya
nitPirit
Pirokse
n
Hemati
tOliv
inZir
con
Andalusit
05
101520253035404550
Histogram Mineral Terhadap Nilai Terkoreksi (-)
Series1
No.Klasifikasi
ButirDiameter (mm)
Diameter Phi (ɸ)
Mid Point (m)
Frekuensi (gr)
% Frekuensi
f.m m-x (m-x)2 f.(m-x)2 (m-x)3 f.(m-x)3 (m-x)4 f.(m-x)4
0,00006 14 1 Lempung 11 4,5 0,45 4,95 10,087 101,7476 45,78641 1026,328 461,8475 10352,57 4658,656 0,0039 8 ` 2 Lanau 6 9,5 0,95 5,7 5,087 25,87757 24,58369 131,6392 125,0572 669,6486 636,1661 0,0625 4
3
Pasir sangat halus 3,5 69 6,9 24,15 2,587 6,692569 46,17873 17,31368 119,4644 44,79048 309,0543
0,125 3 4 Pasir halus 2,5 861,1 86,11 215,275 1,587 2,518569 216,874 3,996969 344,179 6,34319 546,2121 0,25 2
5Pasir
sedang 1,5 53 5,3 7,95 0,587 0,344569 1,826216 0,202262 1,071989 0,118728 0,629257 0,5 1 6 Pasir kasar 0,5 2,9 0,29 0,145 -0,413 0,170569 0,049465 -0,07044 -0,02043 0,029094 0,008437 1 0 1000 258,17 335,2985 1051,6 6150,726
4.2 Analisis Granulometri
So = √ Σf (mᶲ−x )2
100
= 1,83 => Poorly sorted
Sk = Σf (mᶲ−x )3
100.So3
= 1,71 => Fine skewed
K = Σf (mᶲ−x )4
100.So4
= 5,47 => extremly lepto kurtic
Perhitungan Debit
Segment Lebar
Segment
(m)
Panjang
Sungai
Kedalaman Volume
m3
1 15 10 0,30 45
2 5 10 0,75 37,5
3 15 10 0,35 52,5
Waktu Pengukuran (detik) Rata-rata
(t)
Debit
m3/ sT1 T2 T3 T4 T5
11,95 13,67 12,75 12,33 12,76 12,69 2,48
20,68 15,59 20,53 15,73 18,13 18,13 1,75
14,23 17,04 17,77 16,38 18,62 16,81 2,3
Rata-rata debit sungai = 2,18 m3/s
4.3 Analisis Bentuk Kerakal
1. Sampel 1
Gambar: Tester dan Bay
AB’ = 3,3−1,9
3,3 = 0,42
BC’ = 2,1−1,1
2,1 = 0,47
CD’ = 3−1,5
3 = 0,5
DE’ = 3,6−0,3
3,6 = 0,36
EA’ = 2,6−2
2,6 = 0,23
Gambar 4.1 Sampel 1
a. Roundness
Rd = 0,42+0,47+0,5+0,36+0,23
5
= 0,396 Subrounded (Powers, 1949)
Subrounded (Pettijhon, 1949)
b. Sphericity (Ψ)
- Krumbein (1958)
Ψp = ( L. I . SL3 )13= ( 5,5.3,5 .2,3
5,53 )13 = 0,643
Subelongated (Krumbein, 1958)
- Folk
Ψp = ( S2
L. I )13= ( 2,32
5,5.3,5 )13 = 0,65 Subelongated
c. Flattenes Ratio (Fr)
Fr = A+B+C
2C = 5,5+3,5+2,3
2.2,3 = 2,45
d. Oblate-Prolate (OP)
- Menurut Dobkins and Folk (1968)
OP = sL/ (L−1 )L−S−0,5 = 2,3
5,5/ (5,5−1 )5,5−2,3−0,5 = 1,04
2. Sampel 2
Gambar: Tester dan Bay
AB’ = 6−1,4
6 = 0,767
BC’ = 4 ,7−1,3
4,7 = 0,723
CD’ = 4,9−1,7
4,9 = 0,653
DE’ = 4,5−2,3
4,5 = 0,489
Gambar 4.2 Sampel 2
a. Roundness
Rd = 0,767+0,723+0,653+0,489
4
= 0,658 Rounded (Powers, 1949)
Well rounded (Pettijhon, 1949)
b. Sphericity (Ψ)
- Krumbein (1958)
Ψp = ( L. I . SL3 )13= ( 5,5.4,5 .1,8
5,53 )13 = 0,644
Subelongated (Krumbein, 1958)
- Folk
Ψp = ( S2
L. I )13= ( 1,82
5,5. 4,5 )13 = 0,50 Intermediate shape
c. Flattenes Ratio (Fr)
Fr = A+B+C
2C = 5,5+4,5+1,8
2.1,8 = 3,27
d. Oblate-Prolate (OP)
- Menurut Dobkins and Folk (1968)
OP = sL/ (L−1 )L−S−0,5 = 4,5
5,5/ (5,5−1 )5,5−1,8−0,5 = 1,71
3. Sampel 3
Gambar: Tester dan Bay
AB’ = 2,8−1,8
2,8 = 0,71
BC’ = 1,7−0,8
1,7 = 0,52
CD’ = 1,7−0,3
1,7 = 0,82
DE’ = 2,7−1,4
2,7 = 0,48
Gambar 4.3 Sampel 3 EF’ = 1,4−0,7
1,4 = 0,5
FA’ = 2,5−0,8
2,5 = 0,68
a. Roundness
Rd = 0,71+0,52+0,82+0,48+0,5+0,68
6
= 0,62 Rounded (Powers, 1949)
Rounded (Pettijhon, 1949)
b. Sphericity (Ψ)
- Krumbein (1958)
Ψp = ( L. I . SL3 )13= ( 4,2.2,9 .2,4
4,23 )13 = 0,73
Very equent (Krumbein, 1958)
c. Flattenes Ratio (Fr)
Fr = A+B+C
2C = 4,2+2,9+2,4
2.2,4 = 1,97
d. Oblate-Prolate (OP)
- Menurut Dobkins and Folk (1968)
OP = sL/ (L−1 )L−S−0,5 = 2,4
4,2/ (4,2−1 )4,2−2,4−0,5 = 2,42