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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Bulletin of Geology
Hermes Panggabean
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Geokimia Batuan Gunungapi di Pulau Timor Bagian Barat dan Impikasi Tektoniknya Joko Wahyudiono; Ildrem Safri; Hermes Panggabean
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 4 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i4.24

Abstract

Geologi wilayah Timor bagian barat berasal dari tiga mintakat yaitu Mintakat Benua Australia, Mintakat Busur Banda dan batuan yang terendapkan setempat. Pengambilan dan analisis conto batuan di Sungai Fatu dan Kompleks Mutis serta tambahan data sekunder dari Sungai Metan, Pulau Atauro dan batuan hasil Deep Sea Drilling Project (DSDP) bertujuan untuk mengetahui batuan asal wilayah Timor berdasarkan data geokimia batuan gunungapi dan implikasi tektoniknya. Metodologi analisis geokimia yang digunakan adalah X-ray fluorescence (XRF) dan Inductively Coupled Plasma–Mass Spectrometry (ICP-MS) untuk mengetahui unsur utama, unsur jejak dan unsur tanah langka dari batuan gunungapi. Unsur-unsur ini digunakan untuk klasifikasi batuan dan lingkungan tektoniknya.Hasil analisis geokimia conto batuan gunungapi dari Sungai Fatu dan DSDP berasal dari Benua Australia, sementara conto batuan dari Kompleks Mutis dan Sungai Metan menunjukkan Benua Asia atau Busur Banda seperti pada Pulau Atauro. Batuan basal dari Sungai Fatu terendapkan menjemari dengan batugamping Formasi Maubise berumur Perem dan merupakan Oceanic Island Basalt. Batuan basal dari Deep Sea Drilling Project (DSDP) secara geokimia termasuk subalkalin yang berasal dari pematang tengah samudera (Normal Mid Oceanic Ridge Basalt) berumur Jura.Kompleks Mutis pada Oligosen Miosen mengawali kolisi antara Benua Asia dengan Benua Australia. Batuan metabasal Kompleks Mutis menunjukkan komposisi kalk-alkalin yang mencirikan busur kepulauan. Conto batuan dari Sungai Metan dan Pulau Atauro terutama menunjukkan komposisinya subalkaline. Puncak kegiatan kolisi terjadi pada Akhir Miosen – Awal Pliosen dan berlanjut hingga sekarang. Busur Banda bagian dalam sebagian gunungapinya sudah tidak aktif lagi seperti yang terjadi pada Pulau Atauro.Kata kunci : geokimia, batuan gunungapi, mintakat, tektonik, kolisi, Timor
"Brittleness Index" Lapisan Serpih Formasi Kelesa Bagian Atas di Kuburan Panjang, Cekungan Sumatera Tengah , Riau M. Heri Hermiyanto Zajuli; Hendarmawan Hendarmawan; Hermes Panggabean
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 1 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i1.26

Abstract

Penelitian ini difokuskan pada nilai Brittleness Index (BI) serpih di daerah Kuburan Panjang sub-Cekungan Sumai, Cekungan Sumatera Tengah. Subjek penelitian ini adalah kehadiran mineral-mineral getas pada batuan serpih dari Formasi Kelesa bagian atas yang berumur Eosen-Oligosen. Serpih mengandung kuarsa dan karbonat sebagai indikator mineral getas yang sangat dominan. Berdasar nilai kandungan material organik pada serpih Formasi Kelesa dari 1,18% sampai 7,17% yang menunjukkan kemampuan serpih sebagai batuan induk termasuk kategori sangat baik. Serpih Formasi Kelesa bagian atas mempunyai BI berkisar antara 35,72 – 63,19 % yang tergolong ke dalam kategori sedang sampai baik (sedikit lunak/less ductile - rapuh/brittle). Kandungan mineral getas yaitu kuarsa dan karbonat ternyata sangat mempengaruhi nilai Brittleness Index (BI) di lokasi penelitian. Sementara itu mineral lempung (iliit, kaolinit, dickite, nacrite) kurang memberikan dampak terhadap nilai BI.  Kata kunci : Formasi Kelesa, Eosen-Oligosen, Cekungan Sumatera Tengah,          Brittleness Index (BI) 
Karakteristik dan Diagenesis beberapa Percontoh Batuan Oil Shale Formasi Kasiro Terpilih, di Jambi dan Sumatera Selatan berdasarkan Scanning Electron Microscope (SEM) Mohammad Heri Hermiyanto; Hermes Panggabean
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 6 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i6.375

Abstract

Oil shale, as one of alternative energy resources, is recognized in the Late Eosen - Oligocene Kasiro Formation, located in the Rawas Ulu and Batang Asai areas. Based on SEM analysis, the shale  consists of smektite-illite, illite,  kaolinite, organic matter as liptinite (sporinite,and alginite) and contains oil droplet.The oil shale is composed of smectite-illite and illite characterised by wavy parallel fissile,while kaolinite clays show irregular shape characters. The shale has undergone a diagenetic process within an early mesodiagenetic level. Organic matter maturity level of the oil shale, in general, is the immature up to early mature. Keywords : oil shale,clay minerals,smectite-illite,  organic matter
Chemostratigraphy and Paleoenvironment of the Miocene Organic Rich Sediments in the East Kutai Sub-Basin, Indonesia Asep Kurnia Permana; Aris Kusworo; Joko Wahyudiono; Y A. Sendjaja; Hermes Panggabean; L Fauziely
Jurnal Geologi dan Sumberdaya Mineral Vol. 23 No. 1 (2022): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v23i1.660

Abstract

The Miocene sedimentary rocks in Samarinda area constrains organic rich sediments, which are considered as a good source rocks hydrocarbon in the East Kutai Sub-Basin, Kalimantan. The high organic material content within the sediments is related to the dynamics of depositional environment in deltaic setting. The accumulation and characteristics of organic matter in this area may be influenced by multiple factors, under a complex physical-chemical processes. Geochemical data of major and trace elements obtained for a total 309 outcrop samples from four locations were interpreted to define chemostratigraphic and paleoenvironmental conditions (paleoproductivity, detrital influx, paleoredox and paleosalinity) responsible for organic carbon accumulation and source rocks characterization. Stratigraphic variation in inorganic geochemistry allows two chemostratigraphic packages to be defined and correlated within the Miocene sedimentary sequences. These chemostratigraphic packages are geochemically differentiated using SiO2/Al2O3, TiO2/Al2O3, Na2O/Al2O3, TiO2/Nb and Sr/Ba ratio values. The chemical alteration index (CIA) suggests that the sedimentary unit was deposited in a hot and humid climate, with moderate to intensive weathering intensity. Detrital material input proxies (Si/Al, Ti/Al) indicate that the low Si/Al and Ti/Al ratios reflect a low material input providing an increasing organic matter accumulation in the Middle Miocene. However, paleoproductivity proxies (P/Ti, Ba/Al) show the organic matter enrichment is not restrained by water column productivity, as indicated by a weak correlation between TOC and productivity index. In addition, paleosalinity index (Sr/Ba) and redox indicators (V/Cr, V/Sc U/Th and Mo/Al) indicate that the sediments were deposited in a brackish environment with dysoxic to suboxic conditions and might be the main control in the enrichment of organic matter in the study area. Thus, the detrital material influx and paleoredox conditions controlled organic accumulation and source characteristics the Miocene sedimentary sequence of the Kutai Basin.Keywords: Chemostratigraphy, Kutai Basin, paleoenvironment, source rocks.
BASIN GEOMETRY ANALYSIS OF “NOKEN” AREA, MESOZOIC INTERVAL, AKIMEUGAH BASIN, PAPUA David Ontosari; Benyamin Sapiie; Hermes Panggabean; Edy Slameto
Bulletin of Geology Vol 2 No 2 (2018): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2018.2.2.3

Abstract

Area "Noken" is located in the Akimeugah Basin, southern of Papua, covering onshore and offshore areas. In previous research, this area is still defined as laterally uniform passive margin basin during Mesozoic Era. A number of data include airborne-gravity anomaly, satellite gravity (TOPEX-Sandwell), land gravity, the total intensity of magnetism, oil and gas wells, seismic, and data retrieval surface sample obtained from the Center for Geological Survey, Geological Agency (PSG) and the Center for Data and Information (Pusdatin) Ministry energy and Mineral Resources (ESDM). Data processed by the method of forward-inversion modeling on Geosoft software and mapped by the method of minimum curvature in the Petrel software. The results of the analysis are fault and stratigraphic horizons in the Mesozoic Era. Their density recorded properly using distribution data from three wells (Well A, Well B, and Well C). Based on interpretation of gravity maps, total magnetic intensity maps, and subsurface geological model at the top of the Mesozoic, could be concluded that the geometry of the basin in "Noken" area during Mesozoic was dominated by the graben and half-graben, with the longitudinal axis of the fault trending relative northeast - southwest (NW- SW). Isopach map of the Mesozoic interval is supporting data to prove this basin geometry. In particular, during Triassic syn-rifts were formed and the post-rift sediments were formed during Jurassic - Cretaceous. The longitudinal axis of the basin is relatively parallel to the fault constituent. Based on the analysis of the structure of the subsurface geological structure map of the Mesozoic and Cenozoic, gravity sections and models can be interpreted that tectonic evolution during Cenozoic changes the geometry of the basin became trending northwest-southeast.
Co-Authors Aris Kusworo Asep Kurnia Permana Benyamin Sapiie David Ontosari Edy Slameto Hendarmawan Hendarmawan Ildrem Safri Joko Wahyudiono Joko Wahyudiono L Fauziely M. Heri Hermiyanto Zajuli Mohammad Heri Hermiyanto Y A. Sendjaja