GEOLOGI DAN HUBUNGAN SERPENTINISASI TERHADAP KADAR NIKEL LATERIT PADA BLOK “GURE” DAERAH JIKO MOI, KECAMATAN WASILE SELATAN, KABUPATEN HALMAHERA TIMUR, PROVINSI MALUKU UTARA

PUTRA, HAFIIZH RAMADHANA FAJRY (2025) GEOLOGI DAN HUBUNGAN SERPENTINISASI TERHADAP KADAR NIKEL LATERIT PADA BLOK “GURE” DAERAH JIKO MOI, KECAMATAN WASILE SELATAN, KABUPATEN HALMAHERA TIMUR, PROVINSI MALUKU UTARA. Skripsi thesis, UPN Veteran Yogyakarta.

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Abstract

GEOLOGI DAN HUBUNGAN SERPENTINISASI TERHADAP KADAR NIKEL
LATERIT PADA BLOK GURE, DAERAH JIKO MOI, KECAMATAN WASILE
SELATAN, KABUPATEN HALMAHERA TIMUR, PROVINSI MALUKU UTARA
SARI
Blok “Gure” di daerah Jiko Moi, Halmahera Timur, merupakan salah satu
wilayah prospektif bagi endapan nikel laterit yang berkembang di atas batuan
ultramafik terserpentinisasi. Penelitian ini bertujuan untuk memahami peran proses
serpentinisasi terhadap pengayaan nikel laterit, serta meninjau faktor lain seperti
kemiringan lereng, curah hujan, dan kerapatan struktur geologi yang turut
memengaruhi distribusinya. Metode yang digunakan meliputi pemetaan geologi,
analisis petrografi, uji geokimia XRF (X-ray fluorescence), serta interpretasi data
morfologi dan struktur geologi. Hasil penelitian menunjukkan bahwa tingkat
serpentinisasi memiliki hubungan tidak langsung terhadap mobilitas dan re-akumulasi
unsur nikel. Proses serpentinisasi diyakini tidak terlalu berpengaruh terhadap
pengayaan atau pengurangan kadar Ni karena serpentinisasi merupakan metamorfisme
derajat rendah yang tidak akan mengubah sifat Ni yang semi mobile. Selain itu, faktor
kemiringan lereng turut memengaruhi proses pelindian vertikal, di mana lereng landai
memungkinkan pelapukan berjalan lebih stabil. Kerapatan struktur seperti kekar dan
sesar meningkatkan infiltrasi air, mempercepat pelarutan unsur dan memperluas zona
pelapukan. Sementara itu, curah hujan tinggi di wilayah tropis basah seperti Halmahera
juga menjadi pendorong utama terbentuknya horizon laterit yang kaya nikel. Secara
keseluruhan, interaksi antara kondisi geologi, tingkat ubahan batuan, dan faktor
lingkungan memberikan pengaruh signifikan terhadap potensi pengayaan nikel laterit.
Temuan ini diharapkan menjadi acuan dalam kegiatan eksplorasi nikel di wilayah
dengan karakteristik geologi serupa.
Kata kunci: curah hujan, kemiringan lereng, nikel laterit, saprolit, serpentinisasi,
struktur geologi
Geology and the Relationship of Serpentinization to Lateritic Nickel Enrichment in
the Gure Block, Jiko Moi Area, Wasile Selatan Subdistrict, East Halmahera
Regency, North Maluku Province
Abstract
The Gure Block, located in the Jiko Moi area of East Halmahera, is considered
a prospective zone for lateritic nickel deposits that have developed over serpentinized
ultramafic rocks. This research aims to understand the role of serpentinization in nickel
enrichment and to examine other factors such as slope steepness, rainfall, and
geological structure density that influence its distribution. The study employed
geological mapping, petrographic analysis, X-ray fluorescence (XRF) geochemical
testing, and interpretation of morphological and structural data. Research results
indicate that the level of serpentinizatio has an indirect relationship with the mobility
and re-accumulation of nickel elements. The serpentinizatio process is believed to have
little effect on the enrichment or reduction of Ni content because serpentinizatio is a
low-grade metamorphism that does not alter the properties of semi-mobile Ni. In
addition, slope gradient plays a role in vertical leaching, where gentle slopes allow
more stable and prolonged weathering. Structural density, including joints and faults,
enhances water infiltration and accelerates the leaching of elements, thus widening the
weathered zone. Moreover, high annual rainfall, typical of the humid tropical climate
in Halmahera, is a major driving force in the development of nickel-rich lateritic
horizons. Overall, the interplay between geological characteristics, alteration
intensity, and environmental factors significantly influences the potential for lateritic
nickel enrichment. These findings are expected to serve as a reference for exploration
activities in regions with similar geological settings.
Keywords: geological structure, lateritic nickel, rainfall, saprolite, serpentinization,
slope gradient

Item Type:	Thesis (Skripsi)
Uncontrolled Keywords:	geological structure, lateritic nickel, rainfall, saprolite, serpentinization, slope gradient
Subjek:	Q Science > QE Geology
Divisions:	Fakultas Teknologi Mineral dan Energi > Teknik Geologi (S1)
Depositing User:	Eko Yuli
Date Deposited:	22 Jul 2025 03:53
Last Modified:	22 Jul 2025 03:53
URI:	http://eprints.upnyk.ac.id/id/eprint/43191

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