Imalianda, Nabila Putri (2023) GEOLOGI DAN ANALISIS FRAKSINASI UNTUK MENGETAHUI KARAKTERISTIK NIKEL LATERITE PADA ZONA SAPROLIT LAPANGAN ‘’KAPALEO’’ PULAU GEBE, MALUKU UTARA, HALMAHERA TENGAH. Other thesis, UPN "Veteran" Yogyajarta.
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Abstract
vi
SARI
NABILA PUTRI IMALIANDA
111.190.025
Pulau Gebe Kabupaten Halmahera Tengah, Provinsi Maluku Utara
termasuk dalam volcanic belts dan terdapat kompleks basement batuan
ultramafik-mafik. Secara Geografis daerah telitian berada pada koordinat Xmin =
544000, Xmax = 545500, Ymin= 9992500, dan Ymax= 9993750 (UTM WGS84
Zona 52S) yang tercangkup dalam Peta Geologi Lembar Waigeo,Irian Jaya
dengan skala 1:250.000.
Secara geomorfik, daerah telitian dibagi menjadi tiga bentuk asal dan
empat bentuk lahan yaitu, Satuan Bentuk Asal Struktural terdiri dari lereng
struktural (S1), Satuan Bentuk Asal Denudasional terdiri dari satuan Perbukitan
bergelombang lemah (D1) dan Lereng denudasional (D2), dan Satuan Bentuk Asal
Antropogenik terdiri dari PIT (A2).
Stratigrafi daerah telitian tersusun atas dua satuan, yaitu satuan litodem
Peridotit Gebe yang terdiri dari Harzburgit, Lherzolite, dan Piroksenit dan satuan
litodem Serpentinit Gebe yang merupakan bagian dari Kompleks Ofiolite Waigeo
berumur 148 + 8 Ma (Jurassic Atas) berdasarkan dating radiometric K/Ar
xenolith harzburgite pada intrusi dike pada Pada Pulau Gag. (Supriatna ,1995).
Struktur geologi yang berkembang pada daerah telitian adalah sesar dan
kekar yang dijumpai pada LP 7 berupa Reverse Right Slip Fault dengan arah
N296°E/85°, Right Slip Fault dengan arah N222°E/62° dan sesar pada Lp 10
berupa Reverse Right Slip Fault dengan arah N142°E/85°. Sedangkan struktur
kekar yang dijumpai pada daerah penelitian berupa kekar gerus berpasangan pada
LP 26 dengan arah kekar gerus 1 N293°E/75° dan kekar gerus 2 N240°E/42° dan
kekar terisi mineral (Extension Joint Release Joint) Lp 40 dengan arah umum
kekar 1 N 206°E / 69°, kekar 2 N 102°E / 85°, release joint N 149° E / 67°,
extension joint N 243°E / 81°, dengan arah tegasan Timut laut-Barat daya.
Karakteristik nikel laterite dikelathui dengan profil nikel laterite serta
analisis fraksinasi pada tiga dinding Lapangan ‘Kapaleo’ untuk mengetahui
kelimpahan unsur Ni, Fe,Mg, dan Si pada ukuran fraksi tertentu (5cm, 2,5cm, dan
<1cm) didukung dengan hasil analisis XRF (X-Ray Fluorescense) Pengambilan
tiga titik fraksi didasarkan atas pengamatan lapangan yang dianggap mawakili
karakteristik pada Lapangan ‘Kapaleo’, Titik pertama diambil karena bedrock-nya
berupa batuan serpentinit sehingga dapat mengetahui karakteristik laterit yang
GEOLOGI DAN ANALISIS FRAKSINASI UNTUK
MENGETAHUI KARAKTERISTIK NIKEL LATERITE
PADA ZONA SAPROLIT LAPANGAN ‘’KAPALEO’’ PULAU
GEBE, MALUKU UTARA, HALMAHERA TENGAH
vii
dihasilkan dengan perbedaan komposisi batuan dasarnya. Titik kedua diambil
karena banyak mengandung silika tidak ada garnierit, namun hadir krisopras.
Sedangkan titik ketiga diambil karena terdapat dua zona laterit, yaitu earthy
saprolite dan rocky saprolite sehingga dapat menggambarkan karakteristik tiap
zonasi lateritnya.dimana memiliki sedikit kandungan silika dan kaya akan mineral
garnierite.
Lapangan ‘Kapaleo’ menunjukkan karakteristik yang khas berupa
kehadiran silika dengan tekstur boxwork, Kehadiran boulder jarang tidak ada
fraksi yang lebih dari 20 cm, Zona Limonite dominasi dijumpai pada bagian Barat
Daya hal ini dipengaruhi oleh intensitas rekahan, mobilitas unsur, morfologi, dan
tingkat serpentinisasi batuan dasar, Berdasarkan data X-Ray Fluorescense,
kelimpahan unsur Ni, Fe, dan Mg didominasi oleh ukuran fraksi kecil. Kadarnya
meningkat seiring dengan penurunan ukuran butir. Sebaliknya, kandungan Si
didominasi oleh fraksi berbutir besar, kadarnya relatif menurun seiring dengan
penurunan ukuran butir.
Kata Kunci : Gebe, Kadar, Karakteristik, Nikel Laterit, Fraksinasi
viii
ABSTRACT
NABILA PUTRI IMALIANDA
111.190.025
Gebe Island, Central Halmahera Regency, North Maluku Province is included in
the volcanic belts and there is a basement complex of ultramafic-mafic rocks.
Geographically, the study area is located at coordinates Xmin = 544000, Xmax =
545500, Ymin = 9992500, and Ymax = 9993750 (UTM WGS84 Zone 52S) which is
included in the Geological Map of Waigeo Sheet, Irian Jaya with a scale of 1:250,000.
Geomorphically, the study area is divided into three forms of origin and four
landforms, namely, Structural Form Unit consisting of structural slopes (S1),
Denudational Form Unit consisting of weak undulating hills (D1) and denudational
slopes (D2), and Anthropogenic Form Unit consisting of PIT (A2).
The stratigraphy of the study area is composed of two units, namely the Gebe
Peridotite lithodemite unit consisting of Harzburgite, Lherzolite, and Pyroxenite and
the Gebe Serpentinite lithodemite unit which is part of the Waigeo Ofiolite Complex
aged 148 + 8 Ma (Upper Jurassic) based on radiometric dating of K/Ar xenolith
harzburgite in dike intrusions on Gag Island. (Supriatna, 1995).
Geological structures that develop in the study area are faults and joints found at
LP 7 in the form of Reverse Right Slip Fault with direction N296°E/85°, Right Slip
Fault with direction N222°E/62° and fault at LP 10 in the form of Reverse Right Slip
Fault with direction N142°E/85°. While the joints structure found in the study area in
the form of paired at LP 25 with the direction 1 N293°E/75° and 2 N240°E/42° and
(Extension Joint Release Joint) Lp 40 with the direction 1 N206°E/69° and 2
N149°E/67° with the direction of Northeast-Southwest.
Nickel laterite characteristics were studied with nickel laterite profiles and
fractionation analysis on three walls of the 'Kapaleo' Field to determine the abundance
of Ni, Fe, Mg, and Si elements at certain fraction sizes (5cm, 2.5cm, and <1cm)
supported by the results of XRF (X-Ray Fluorescense) analysis. The three fraction
points were taken based on field observations that were considered to represent the
characteristics of the 'Kapaleo' Field, the first point was taken because the bedrock
was serpentinite rock so that it could determine the characteristics of the laterite
produced with differences in bedrock composition. The second point is taken because
GEOLOGY AND FRACTIONATION ANALYSIS TO
CHARACTERIZE NICKEL LATERITE IN SAPROLITE ZONE
OF ''KAPALEO'' FIELD, GEBE ISLAND, NORTH MALUKU,
CENTRAL HALMAHERA
ix
it contains a lot of silica, there is no garnierite, but chrysopras is present. While the
third point was taken because there are two laterite zones, namely earthy saprolite and
rocky saprolite so that it can describe the characteristics of each laterite zone, which
has little silica content and is rich in garnierite minerals.
The 'Kapaleo' field shows distinctive characteristics in the form of the presence of
silica with a boxwork texture, the presence of boulders is rare there are no fractions
greater than 20 cm, Limonite Zone dominance is found in the Southwest this is
influenced by fracture intensity, element mobility, morphology, and the level of
serpentinization of bedrock, Based on X-Ray Fluorescense data, the abundance of Ni,
Fe, and Mg elements is dominated by small fraction sizes. Their levels increase with
decreasing grain size. In contrast, Si content is dominated by the large-grained
fraction, its relative content decreases with decreasing grain size.
Keywords: Gebe, Grades, Characteristics, Laterite Nickel, Fractionation
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Gebe, Grades, Characteristics, Laterite Nickel, Fractionation |
| Subjects: | T Technology > T Technology (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 27 Jul 2023 02:27 |
| Last Modified: | 27 Jul 2023 02:27 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/36589 |
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