YULIANA, TRI (2025) PERUBAHAN LINGKUNGAN HOLOSEN AKHIR PADA CORE PB4 BERDASARKAN ANALISIS SEDIMENTOLOGI, GEOKIMIA, DAN PALINOLOGI DAERAH JAILOLO, HALMAHERA BARAT, MALUKU UTARA. Skripsi thesis, UPN Veteran Yogyakarta.
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Abstract
ABSTRAK
PERUBAHAN LINGKUNGAN HOLOSEN AKHIR PADA
CORE PB4 BERDASARKAN ANALISIS SEDIMENTOLOGI,
GEOKIMIA, DAN PALINOLOGI DAERAH JAILOLO,
HALMAHERA BARAT, MALUKU UTARA
Oleh
Tri Yuliana
NIM: 111210033
Program Studi Sarjana Teknik Geologi
Penelitian ini dilakukan di daerah Jailolo, Halmahera Barat, untuk menganalisis
karakteristik sedimen dan dinamika lingkungan pada sistem pengendapan gambut
tropis. Penelitian ini diatarbelakangi oleh masih terbatasnya penelitian mengenai
sedimen gambut di wilayah Halmahera. Pengambilan data dilakukan pada satu titik
bor, yaitu core PB4 dengan kedalaman 270 cm. Tujuan dari penelitian ini adalah
mengkaji perkembangan lingkungan dan respon sedimen terhadap perubahan
lingkungan seperti faktor iklim dan proses eksternal lainnya. Metode yang
digunakan meliputi analisis deskripsi megaskopis, granulometri, kandungan bahan
organik dan karbonat menggunakan metode Loss on Ignition (LOI), analisis unsur
kimia dengan X-Ray Fluorescence (XRF), analisis palinologi, serta dating
radiokarbon C-14. Analisis granulometri, XRF, dan LOI dilakukan setiap interval
5 cm, analisis palinologi dilakukan setiap interval 20 cm, serta dating radiokarbon
dilakukan pada 4 titik kedalaman. Hasil penelitian menunjukkan adanya perubahan
fasies dari lingkungan klastik, menuju pembentukan gambut dalam lingkungan
tertutup dan stagnan, lalu berkembang ke sistem terbuka dengan dominasi sedimen
klastik halus. Hasil LOI menunjukkan kandungan bahan organik tertinggi mencapai
37% pada interval litologi gambut, dan terendah 3,8% pada interval lanau. Rasio
unsur Fe/K dan Sr/K mencerminkan fluktuasi curah hujan sebagai indikasi
dinamika iklim. Komposisi palinomorf kurang dapat mencerminkan kondisi
lingkungan yang sebenarnya akibat kemungkinan hilangnya takson tertentu pada
saat proses preparasi. Dating radiokarbon menunjukkan bahwa sedimen pada
kedalaman 177 cm, 150 cm, 90 cm, dan 50 cm masing-masing berumur sekitar 465,
305, 187 tahun BP, dan endapan modern. Kecepatan sedimen meningkat dari 0,169
cm/tahun pada interval 177-150 cm dengan litologi dominan gambut menuju 0,508
cm/tahun pada interval 150-90 cm seiring dengan meningkatnya kandungan
material klastik. Penelitian ini menunjukkan bahwa fasies dan karakteristik sedimen
dapat mencerminkan perubahan lingkungan dan iklim secara signifikan di wilayah
Jailolo.
Kata kunci: Jailolo, geokimia, palinologi, perubahan lingkungan, sedimen
vii
ABSTRACT
LATE HOLOCENE ENVIRONMENTAL CHANGES IN CORE PB4 BASED
ON SEDIMENTOLOGICAL, GEOCHEMICAL, AND PALYNOLOGICAL
ANALYSIS IN JAILOLO, WEST HALMAHERA, NORTH MALUKU
By
Tri Yuliana
NIM: 111210033
Geological Engineering Undergraduated Program
The study area is located in Jailolo, West Halmahera, focusing on the sediment
characteristics and environmental changes in a tropical peat depositional system.
The study was motivated by the lack of research on peat sediments in the Halmahera
region. Data were collected from a single borehole, core PB4, with a total depth of
270 cm. This study aims to understand how the environment developed over time
and how the sediments responded to climate and other external factors. The
methods used include macroscopic description, grain size analysis (granulometry),
analysis of organic and carbonate content using the Loss on Ignition (LOI) method,
chemical element analysis using X-Ray Fluorescence (XRF), palynological
analysis, and radiocarbon (C-14) dating. Granulometry, XRF, and LOI were
analyzed at 5 cm intervals, while palynology was done every 20 cm, and
radiocarbon dating was performed at four depth points. The results indicate a
transition from a high-energy environment characterized by coarse sediments to
peat formation under closed and stagnant conditions, followed by the development
of a more open system with fine clastic sediments. LOI results show the highest
organic content (37%) in the peat layer and the lowest (3.8%) in the silt layer. The
Fe/K and Sr/K ratios indicate rainfall variation as a sign of climate change.
Palynomorph composition does not fully represent the actual environment, possibly
due to the loss of some taxa during sample preparation. Radiocarbon dating shows
that sediments at depths of 177 cm, 150 cm, 90 cm, and 50 cm are about 465, 305,
187 years BP, and modern, respectively. The sedimentation rate increased from
0.169 cm/year in the 177–150 cm interval, which is dominated by peat, to 0.508
cm/year in the 150–90 cm interval, along with an increase in clastic material
content. This study shows that sediment facies and characteristics can reflect
significant environmental and climate changes in the Jailolo area.
Keywords: environmental change, Jailolo, geochemistry, palynology, sediments
viii
| Item Type: | Tugas Akhir (Skripsi) |
|---|---|
| Uncontrolled Keywords: | environmental change, Jailolo, geochemistry, palynology, sediments |
| Subjek: | Q Science > QE Geology |
| Divisions: | Fakultas Teknologi Mineral dan Energi > (S1) Teknik Geologi |
| Depositing User: | Eko Yuli |
| Date Deposited: | 11 Nov 2025 02:04 |
| Last Modified: | 11 Nov 2025 02:10 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/45365 |
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