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Facies Analysis From Kikim Formation in Garba Mountain, South Palembang Subbasin Daryono, Sapto Kis; Afrilita, Afrilita; Idarwati, Idarwati
Jurnal Ilmiah MTG Vol 14, No 2 (2023): Jurnal Ilmiah MTG Volume 14 No.2 Tahun 2023
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmtg.v14i2.11854

The Kikim Formation, especially the Cawang Member, has an important role in the formation and stratigraphic evolution of Paleogene age sedimentary rocks in the South Sumatra Basin because of their presence as pre-rift deposits. These deposits occurred before or simultaneously with the basin's formation. The results of research regarding facies analysis and interpretation of the depositional environment of the Kikim Formation located in the Garba Mountains will provide an explanation and description of the history of the formation and stratigraphic evolution of Paleogene age sedimentary rocks in the South Sumatra Basin as reflected in their lithological and facies characteristics. Facies analysis was conducted on the stratigraphic cross-section of the conglomerate deposit and sandstone deposit 1. The conglomerate deposit and sandstone deposit had thicknesses of ± 158.82 m and ± 177.50 m, respectively, on the Bumi Agung and Batu Belang measurement lines, South Ogan Komering Ulu area, Sumatra South. Facies analysis leads to the division of facies according to Miall (1978), namely eight lithofacies, namely Gravel matrix supported massive (Gmm), matrix supported Gravel (Gmg), massive Gravel (Gm), massive Sandstone (Sm), horizontally bedded Sandstones (Sh), low angel cross-bedding Sand (SI), Carbonaceous mud (C), massive Fine sandstone silt mud (Fm), Massive siltstones, and mudstones (Fsm). The facies associations obtained were Gravel Bars (GB), Sandy Bedforms (SB), channel (CH), and Overbank fine (FF). It showed that the depositional environment was a fluvial environment, and it was found that the type of river in the research area in the Kikim Formation was a braided river with Gravel braided rivers with sedimentary gravity flows model.

Deposition Environment Interpretation of Lemat Formation in the West Tanjung Jabung, Jambi Province Daryono, Sapto Kis; Afrilita, Afrilita; Idarwati, Idarwati
Journal of Earth and Marine Technology (JEMT) Vol 4, No 2 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v4i2.5626

The study of facies analysis and interpretation of the depositional environment of the Lemat Formation located on Bukit Tigapuluh aimed to clarify the problems found in Paleogene sediments in the South Sumatra Basin. The results of research on facies analysis and interpretation of the depositional environment of the Lemat Formation will provide an explanation and description of the history of the formation and stratigraphic evolution of Paleogene-aged sedimentary rocks in the South Sumatra Basin as reflected in their lithological and facies characteristics. A detailed analysis of fluvial facies was carried out in the West Tanjung Jabung area, Jambi Province. A stratigraphic cross-section was prepared with an accumulated thickness of ± 25 m. The stratigraphic section included two rock deposits, namely sandstone-quartz deposits and conglomerate deposits. Analysis of lithofacies and architectural elements of the study area indicated a fluvial depositional environment. The resulting architectural elements consisted of six associations: channel (CH), scour hollows (HO), gravel bedform (GB), sediment gravity flows (SG), sandy bedform (SB), and floodplain fines (FF). The dominance of sedimentary material, which tends to be coarse, and the many facies associations GB, SG, and SB indicated many river bars and were characteristic of braided rivers. The obtained interpretation of the depositional environment was Conglomerate deposits in the Alluvial Fans System with Gravity Flow River environment or gravel bed braided river, and sandstone-gravel deposits in the shallow environment or gravel bed braided river.

Identifikasi Zona Mineralisasi Dan Struktur Pengontrol Skarn Cu Daerah Sulit Air, Kabupaten Solok, Provinsi Sumatera Barat Afrilita, Afrilita; Idrus, Arifudin; Pambudi, Setia; Pratomo, Septyo Uji
Jurnal Ilmiah Geomatika Vol 2, No 2 (2022): Oktober Jurnal Ilmiah Geomatika
Publisher : Program Studi Teknik Geomatika Fakultas Teknologi Mineral Universitas Pembangunan Nasional

Endapan skarn merupakan salah satu dari beberapa endapanhidrotermal yang menghasilkan endapan bijih yang bernilai ekonomis. Mineralisasi skarn Cu pada daerah Sulit Air sudah diketahui sejak lama, namun belum banyak penelitian rinci yang membahas tentang kontrol struktur geologi terhadap penyebaran alterasi dan mineralisasi di daerah ini. Penelitian ini membahas tentang identifikasi zona mineralisasi dan kontrol struktur geologi terhadap pola penyebaran alterasi dan mineralisasi skarn Cu. Metodologi yang digunakan yaitu analisis citra DEM dan pemetaan geologi permukaan. Zona alterasi skarn Cu terbagi kedalam empat zonasi yaitu zona piroksen-K-feldspar-klorit-epidot, zona garnet-piroksen, zona piroksen-kuarsa, dan zona garnet-wollastonit-piroksen. Mineralisasi dominan hadir pada zona alterasi garnet-wollastonit-piroksen dan zona garnet-piroksen. Mineral utama pembawa Cu berupa bornit, kalkosit, malakit, azurit dan kalkopirit. Penyebaran alterasi mengikuti pola intrusi dan sesar-sesar mendatar lokal. Zona alterasi ini mengikuti sesar mendatar kiri yang berarah utara-selatan (N-S) sedangkan zona mineralisasi mengisi rekahan-rekahan pada zona sesar mendatar kiri yang berarah utara-selatan (N-S) dan barat laut-tenggara (NW-SE). Kekar pada zona sesar terisi oleh mineral-mineral kalsit, kuarsa dan azurit yang dominan berarah berarah barat laut-tenggara dan timur laut-barat daya.

Identifikasi Zona Mineralisasi Dan Struktur Pengontrol Skarn Cu Daerah Sulit Air, Kabupaten Solok, Provinsi Sumatera Barat Afrilita, Afrilita; Idrus, Arifudin; Pambudi, Setia; Pratomo, Septyo Uji
Jurnal Ilmiah Geomatika Vol. 2 No. 2 (2022): Oktober Jurnal Ilmiah Geomatika
Publisher : Program Studi Teknik Geomatika Fakultas Teknologi Mineral Universitas Pembangunan Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/imagi.v2i2.9421

Endapan skarn merupakan salah satu dari beberapa endapanhidrotermal yang menghasilkan endapan bijih yang bernilai ekonomis. Mineralisasi skarn Cu pada daerah Sulit Air sudah diketahui sejak lama, namun belum banyak penelitian rinci yang membahas tentang kontrol struktur geologi terhadap penyebaran alterasi dan mineralisasi di daerah ini. Penelitian ini membahas tentang identifikasi zona mineralisasi dan kontrol struktur geologi terhadap pola penyebaran alterasi dan mineralisasi skarn Cu. Metodologi yang digunakan yaitu analisis citra DEM dan pemetaan geologi permukaan. Zona alterasi skarn Cu terbagi kedalam empat zonasi yaitu zona piroksen-K-feldspar-klorit-epidot, zona garnet-piroksen, zona piroksen-kuarsa, dan zona garnet-wollastonit-piroksen. Mineralisasi dominan hadir pada zona alterasi garnet-wollastonit-piroksen dan zona garnet-piroksen. Mineral utama pembawa Cu berupa bornit, kalkosit, malakit, azurit dan kalkopirit. Penyebaran alterasi mengikuti pola intrusi dan sesar-sesar mendatar lokal. Zona alterasi ini mengikuti sesar mendatar kiri yang berarah utara-selatan (N-S) sedangkan zona mineralisasi mengisi rekahan-rekahan pada zona sesar mendatar kiri yang berarah utara-selatan (N-S) dan barat laut-tenggara (NW-SE). Kekar pada zona sesar terisi oleh mineral-mineral kalsit, kuarsa dan azurit yang dominan berarah berarah barat laut-tenggara dan timur laut-barat daya.

Facies Analysis From Kikim Formation in Garba Mountain, South Palembang Subbasin Daryono, Sapto Kis; Afrilita, Afrilita; Idarwati, Idarwati
Jurnal Ilmiah MTG Vol 14 No 2 (2023): Jurnal Ilmiah MTG Volume 14 No.2 Tahun 2023
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmtg.v14i2.11854

The Kikim Formation, especially the Cawang Member, has an important role in the formation and stratigraphic evolution of Paleogene age sedimentary rocks in the South Sumatra Basin because of their presence as pre-rift deposits. These deposits occurred before or simultaneously with the basin's formation. The results of research regarding facies analysis and interpretation of the depositional environment of the Kikim Formation located in the Garba Mountains will provide an explanation and description of the history of the formation and stratigraphic evolution of Paleogene age sedimentary rocks in the South Sumatra Basin as reflected in their lithological and facies characteristics. Facies analysis was conducted on the stratigraphic cross-section of the conglomerate deposit and sandstone deposit 1. The conglomerate deposit and sandstone deposit had thicknesses of ± 158.82 m and ± 177.50 m, respectively, on the Bumi Agung and Batu Belang measurement lines, South Ogan Komering Ulu area, Sumatra South. Facies analysis leads to the division of facies according to Miall (1978), namely eight lithofacies, namely Gravel matrix supported massive (Gmm), matrix supported Gravel (Gmg), massive Gravel (Gm), massive Sandstone (Sm), horizontally bedded Sandstones (Sh), low angel cross-bedding Sand (SI), Carbonaceous mud (C), massive Fine sandstone silt mud (Fm), Massive siltstones, and mudstones (Fsm). The facies associations obtained were Gravel Bars (GB), Sandy Bedforms (SB), channel (CH), and Overbank fine (FF). It showed that the depositional environment was a fluvial environment, and it was found that the type of river in the research area in the Kikim Formation was a braided river with Gravel braided rivers with sedimentary gravity flows model.

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