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All Journal Bulletin of Scientific Contribution : Geology Jurnal RISET Geologi dan Pertambangan Jurnal Kelautan Tropis Bulletin of Geology
Purna Sulastya Putra
Pusat Penelitian Geoteknologi, Lembaga Ilmu Pengetahuan Indonesia
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REKAM INTI SEDIMEN GUNA PREDIKSI PERUBAHAN LINGKUNGAN DI DELTA KALIGARANG, PROVINSI JAWA TENGAH Karina Melias Astriandhita; . Winantris; Budi Muljana; Purna Sulastya Putra; . Praptisih
Bulletin of Scientific Contribution: GEOLOGY Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (378.296 KB) | DOI: 10.24198/bsc geology.v15i3.15104

Abstract

ABSTRACTDetailed 20 meters core sampling of sediment was carried out from the recent deltaic Kaligarang, northern part Semarang, Central Java. The main objective of this research is to predict environment changes according to some parameters sedimentation process, for example grain size, organic and inorganic content and the occurrence of benthic foraminifera. The core was analyzed by destructive techniques. The sediment record indicated that the silt grain size dominance deposited in littoral to inner shelf with high organic content than inorganic. Keywords: Kaligarang Delta, grain size, organic content, foraminifera ABSTRAK20 meter rekaman vertikal inti sedimen resen dari Delta Kaligarang, Semarang Utara, Jawa Tengah. Objek penelitian ini untuk memprediksi perubahan lingkungan saat sedimen terendapkan berdasarkan dari parameter besar butir, material organik dan inorganik, dan foraminifera bentik. Inti batuan dianalisis dengan teknik dekstruktif. Hasil penelitian menunjukan bahwa karakter sedimen memiliki dominansi lanau yang terendapkan pada lingkungan litoral-paparan dalam disertai kandungan material organik lebih tinggi dibandingkan inorganik. Kata kunci: Delta Kaligarang, besar butir, material organik, foraminifera
DINAMIKA LINGKUNGAN PENGENDAPAN DELTA KALIGARANG, SEMARANG Karina Melias Astriandhita; Winantris Winantris; Budi Muljana; Purna Sulastya Putra; Praptisih Praptisih
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 27, No 2 (2017)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (846.438 KB) | DOI: 10.14203/risetgeotam2017.v27.485

Abstract

Delta Kaligarang terletak di Utara Pesisir Semarang. Tujuan dari penelitian ini ialah untuk mengetahui dinamika lingkungan pengendapan yang terjadi di Delta Kaligarang, Semarang melalui analisis ukuran butir, material organik dan inorganik dari sembilan puluh contoh sampel. Hasil yang diperoleh menunjukkan adanya dua lingkungan pengendapan berdasarkan karakteristik sedimentologi (besar butir dan organik) yakni lingkungan energi relatif rendah (suspension load) dan lingkungan berarus turbulen (tidal). Selain itu, juga terdapat kenaikan nilai material organik dan inorganik, yang disertai adanya perubahan besar butir. Terlihat bahwa lapisan pada kedalaman 0-31 meter mengalami kenaikan nilai organik, seiring dengan besar butir yang berukuran silt. Hal tersebut berbeda dengan lapisan pada kedalaman 32-45 meter, di mana terdapat perselingan satuan batuan silt dan sand, serta nilai material organik turun.Kaligarang Delta is located in the North Semarang Coast. The objective of this research is to describe dynamic environmental changes in Kaligarang Delta based on grain size, organic and inorganic matters analyzes from ninety samples. The results indicated that two conditions occurred: low-energy-suspension-load environment and tidal (turbulent) environment. Furthermore, the increase of organic and inorganic matters coincides with the grain size distribution. At depth 0-31-meter, organic matter increased that coincident with silt grain size. At depth 32-45 meter the lithology shows interspersed of silt and sand.
Karakteristik Endapan Tsunami Berdasarkan Bukti Palinologi dan Sedimentologi di Bagian Timur Pulau Simeulue, Aceh, Indonesia Winarni Winarni; Anis Kurniasih; Septriono Hari Nugroho; Jenian Marin; Reddy Setyawan; Purna Sulastya Putra; Eko Yulianto
Jurnal Kelautan Tropis Vol 23, No 1 (2020): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v23i1.4954

Abstract

Simeulue Island was located in an active tectonic zone that causes earthquakes followed by tsunamis. This research was conducted to get a detail explanation of tsunami deposits found in eastern Simeulue Island. The methods used in this study include granulometry analysis, Loss on Ignition (LOI), X-ray Fluorescence (XRF), and palynology. Based on analyzed, it was known that tsunami deposits in the studied area have non-uniform grain size characteristics and are dominated by gravel to boulder. The results of the LOI analysis show that the concentration of organic and carbonate material was very high, which is thought to be caused by a mixture of marine and terrestrial materials due to a tsunami. XRF analysis showed high content of Ca and Sr which indicated the influence of seawater on sediments. The palynological analysis showed that taxa from the lowlands and mangroves palynofacies dominate the presence of pollen, indicating that the possibility of depositional environments is the area around the mangrove coast. The presence of high lowland taxa is thought to originate from the tsunami backwash that brought material from the lowlands to the surrounding coast.  Pulau Simeulue terletak pada zona tektonik aktif yang menyebabkan terjadinya banyak gempa yang diikuti tsunami. Penelitian ini bertujuan untuk mengetahui karakteristik detil endapan tsunami yang terdapat di Pulau Simeulue bagian timur. Metode yang digunakan dalam penelitian ini meliputi analisis palinologi, granulometri, Loss on Ignition (LOI), dan XRay Flourescence (XRF). Berdasarkan analisis tersebut diketahui bahwa endapan tsunami di daerah penelitian memiliki karakteristik ukuran butir yang tidak seragam dan didominasi oleh ukuran butir kerikil hingga bongkah. Hasil analisis LOI menunjukkan konsentrasi material organik dan karbonat sangat tinggi, yang diduga disebabkan oleh percampuran material asal laut dan darat karena tsunami. Analisis XRF menunjukkan tingginya kandungan unsur Ca dan Sr yang mengindikasikan adanya pengaruh air laut pada endapan. Analisis palinologi menunjukkan taksa dari palinofasies dataran rendah dan mangrove mendominasi kehadiran polen. Hal ini mengindikasikan bahwa kemungkinan lingkungan pengendapan adalah area sekitar pantai mangrove. Kehadiran taksa dataran rendah yang tinggi diduga berasal dari gelombang balik tsunami yang membawa material dari dataran rendah ke sekitar pantai tersebut.
REKONSTRUKSI PERUBAHAN SUHU PERMUKAAN LAUT BERDASARKAN KUMPULAN FORAMINIFERA DI PERAIRAN UTARA PAPUA, SAMUDRA PASIFIK Adrianus Damanik; Khoiril Anwar Maryunani; Septriono Hari Nugroho; Purna Sulastya Putra
Bulletin of Geology Vol 4 No 1 (2020): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Foraminifera is one of the best proxies used to determine the condition of paleoecology such as to determine sea surface temperature. Sea surface temperature is one of the important ecology parameters to distinguish the oceanography characteristic in a waters/basin. In this study, reconstruction of sea surface temperature (SST) in the North Papua Waters was conducted based on planktonic foraminifera abundance. For this study, we analyzed gravity core with code OS-07 taken during the Nusa Manggala Expedition 2018. This area was chosen because it is one of the ITF entrances, as branch of the global circulation. Therefore, the North Papua Waters are considered recording global climate events. Modern Analogue Technique (MAT) and foraminiferal grouping following the work of Parker (1960) in Boltovskoy and Wright (1976) were applied to this study. The results of temperature analysis using the two methods show the same trend changes. At intervals of 246-88 cm trophic zone foraminifera is not dominant while the subtropic, transitional, and subantartic foraminifera groups are increasing which interpreted to be relatively lower temperature conditions. Foraminifera at 88-0 cm depth intervals, trophic foraminifera group is increasing and dominant, interpreted by relatively higher temperature conditions. These results are in line with the SST results based on MAT from the foraminifera data collection that shows that there were two SST trends, depths of 246-86 cm and 86-0 cm. The transition of two trend, at a depth of 86 cm, is interpreted as the boundary of Pleistocene to Holocene. The average temperature difference in February is 1.33oC cooler on Pleistocene compare to Holocene and in August is 0.82oC cooler on Pleistocene compare to Holocene.
Co-Authors . Praptisih Adrianus Damanik Anis Kurniasih Budi Muljana Eko Yulianto Jenian Marin Karina Melias Astriandhita Karina Melias Astriandhita Khoiril Anwar Maryunani Praptisih Praptisih Reddy Setyawan Septriono Hari Nugroho Septriono Hari Nugroho Winantris Winantris Winarni Winarni