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All Journal Bulletin of Scientific Contribution : Geology Jurnal RISET Geologi dan Pertambangan BULLETIN OF THE MARINE GEOLOGY
Marfasran Hendrizan
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Environmental Science

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FASIES DAN LINGKUNGAN PENGENDAPAN BATUAN KARBONAT FORMASI PARIGI DI DAERAH PALIMANAN, CIREBON Praptisih Praptisih; M. Safei Siregar; Kamtono Kamtono; Marfasran Hendrizan; Purna Sulastya Putra
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 22, No 1 (2012)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2595.097 KB) | DOI: 10.14203/risetgeotam2012.v22.56

Abstract

ABSTRAK Batuan karbonat Formasi Parigi tersingkap baik di Komplek Kromong daerah Palimanan, Cirebon dimana studi fasies karbonat ini dilakukan.  Berdasarkan karakter fisik dan biota yang dikandungnya, batuan karbonat Komplek Kromong dapat dikelompokkan menjadi  7 fasies, yakni : (1) fasies boundstone, (2) fasies rudstone, (3) fasies cross bedded grainstone, (4) fasies foraminiferal packstone, (5) fasies algal-foram packstone,  (6) fasies floatstone, dan (7) fasies thin bedded wackestone-packstone. Fasies boundstone dapat dibagi menjadi 2 subfasies yaitu subfasies bafflestone dan subfasies framestone. Lingkungan pengendapan Formasi Parigi diperkirakan  diendapkan pada lingkungan reef front, reef crest, back reef, lagoon-surge chanel dan tidal flat-tidal chanel. Hasil analisis  fosil foraminifera besar menunjukkan  umur Formasi Parigi adalah Miosen Awal. Berdasarkan pada  pola lingkungan pengendapan Formasi Parigi diinterpretasikan terumbu bagian depan berada di sebelah timur laut, sedangkan terumbu bagian belakang di bagian baratdaya.
VARIABILITY OF SEA SURFACE TEMPERATURE AND SALINITY IN MAKASSAR STRAIT DURING THE LAST GLACIAL MAXIMUM Larasati, Oktavira Dwi Demia; Hendrizan, Marfasran; Rachmayani, Rima; Napitupulu, Gandhi
BULLETIN OF THE MARINE GEOLOGY Vol 39, No 2 (2024)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.39.2.2024.882

Abstract

Indonesian Throughflow (ITF), which is part of the global thermohaline circulation, is known to play an important role in the heat exchange between the Pacific and Indian Oceans. The flow of the ITF is highly complex, it depends on temperature and salinity. This study presents a proxy study from 25,000–18,000 years ago from two sites that are connected by the Indonesian Throughflow in the Makassar Strait. Oceanographic characteristics, including Sea Surface Temperature (SST) and Sea Surface Salinity (SSS) were reconstructed and analyzed during the Last Glacial Maximum (LGM) period. A 295 cm marine sediment core coded SO217-18522 (1°24.106'N; 119°04.781'E, water depth 978 m) and SO217-18519 (0°34.329'N; 118°06.859'E, water depth 1658 m) from the SONNE 217 research cruise in 2011 was used as research material. Oxygen isotope  analysis, planktonic foraminiferal Mg/Ca geochemistry, and radiocarbon dating were used in this study. The SST reconstruction shows that the temperature during the LGM reach the minimum during ~20 ka BP and the SST value was significantly lower by ~2–3 °C compared to the Late Holocene value. The SST also shows significant cooler in marine sediment SO2017-8519 located in the southern site compared to the northern site. Salinity reconstructions during the LGM shows that SSS value was 0.82–1.13 psu higher than in the Holocene. The south–north gradients of SST and SSS in the Makassar Strait were larger over the 23.2–24.2 ka BP (SST gradient by 0.5–1 °C and SSS gradien by 1–1.7 psu) compared to the Late Holocene. The increase in SST and SSS gradients during the ~20 ka BP likely indicates a weakened intensity of the surface ITF relative to conditions during the Late Holocene.
THERMOCLINE WATER TEMPERATURE GRADIENT AT THE INDONESIAN THROUGHFLOW PATHWAYS DURING LAST GLACIAL MAXIMUM (LGM) Rachmayani, Rima; Larasati, Oktavira Dwi Demia; Hendrizan, Marfasran
BULLETIN OF THE MARINE GEOLOGY Vol 40, No 1 (2025)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.40.1.2025.937

Abstract

This study aims to investigate the strength of the Indonesian Throughflow (ITF) during the Last Glacial Maximum (LGM) in comparison to the Pre-Industrial (PI) at the Makassar Strait, the Molucca Sea, and the Banda Sea, representing the pathways of the ITF. The analysis was performed based on the temperature distribution of the south (S) and north (N) thermocline gradients. Temperature data were obtained from the simulation of the Climate Community System Model, version 4 (CCSM4). The depth of the thermocline layer during the LGM and the PI period exhibits seasonal variability across the S-N stations. At Station 1, 2, and 3, the thermocline depth during the LGM ranges from 49 - 218 m (51 - 251 m), 55 - 250 m (69 - 254 m), and 48 - 238 m (48 - 218 m) in the south (north), respectively. The analysis of seasonal temperature variations in the thermocline layer in the three locations indicates that the ITF was significantly weakened both during the LGM and PI, indicated by the negative S-N Thermocline Water Temperature (TWT) gradient. The result suggests the southern part of each station is predominantly fresher compared to the northern part during these times. Additionally, it implies that the ITF is more robust in the eastern region (Banda Sea) during the LGM compared to the PI. This variation may relate to the intensity of seasonal local winds, mixing processes, and the remote influence of El Niño-like events, which could affect water transport along the pathway of the ITF.
BIOSTRATIGRAFI KALA HOLOSEN TITIK CORE TR1926B, CEKUNGAN UTARA SELAT MAKASSAR, BERDASARKAN KUMPULAN FORAMINIFERA PLANKTONIK Amadeus, Marvel Samgar; Jurnaliah, Lia; Fauzielly, Lili; Hendrizan, Marfasran
Bulletin of Scientific Contribution Vol 23, No 2 (2025): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v23i2.61806

Abstract

Penelitian ini berfokus pada analisis biostratigrafi Kala Holosen di Cekungan Utara Selat Makassar berdasarkan kumpulan foraminifera planktonik dari inti core TR1926B. Interval core yang diteliti (182 – 206 cm) tersusun atas lempung berwarna hijau keabuan hingga abu-abu kehitaman dengan komponen fragmen cangkang skeleta. Berdasarkan penanggalan radiokarbon, interval yang diteliti berada pada rentang umur 9.966 hingga 11.774 tahun lalu. Sebanyak 8.136 individu foraminifera planktonik yang berasal dari 50 spesies dan 15 genus berhasil diidentifikasi dari total 23 sampel. Analisis biostratigrafi menurut zona Bolli & Saunders dan Blow menunjukkan bahwa interval yang diteliti masuk dalam Kala Holosen (Zona N23 Akhir), ditandai dengan kemunculan Globorotalia ungulata yang konsisten dari 11.774 hingga 9.966 tahun lalu. Spesies pendukung lainnya seperti Globigerina bermudezi, Globorotalia fimbriata, Globigerinella calida, dan Beella praedigitata ditemukan secara episodik dan tidak konsisten. Hasil penelitian ini memberikan wawasan mengenai biostratigrafi dan transisi iklim awal Holosen, serta menjadi landasan untuk studi paleoklimatologi lebih lanjut di wilayah ini.
Co-Authors Amadeus, Marvel Samgar Kamtono Kamtono Larasati, Oktavira Dwi Demia Lia Jurnaliah Lili Fauzielly M. Safei Siregar Napitupulu, Gandhi Praptisih Praptisih Purna Sulastya Putra Rima Rachmayani, Rima