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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience JGE (Jurnal Geofisika Eksplorasi) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) OLDI (Oseanologi dan Limnologi di Indonesia) Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan Bulletin of Geology Jurnal Geosaintek
Purna Sulastya Putra, Purna Sulastya
Research Center for Geotechnology Indonesian Institute of Sciences
Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science

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KARAKTERISTIK SEDIMEN HOLOSEN – PLEISTOSEN BERDASARKAN UKURAN BUTIR PADA SEDIMEN INTI EW17-08, TEPI BARATLAUT PAPARAN SUNDA Septriono Hari Nugroho; Putra, Purna Sulastya; Pamungkas, Ageng Digdya Garin
Jurnal Geosaintek Vol. 6 No. 2 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

Sedimen inti EW17-08 terletak pada tepi baratlaut Paparan Sunda. Pengendapan sedimen pada wilayah tersebut berhubungan dengan perubahan kenaikan muka air laut yang terjadi pada paparan Sunda. Penelitian ini merupakan studi pendahuluan yang bertujuan untuk mengetahui karakterstik sedimen berdasarkan analisis tren ukuran butir pada periode transisi Holosen - Pleistosen. Sedimen inti EW17-08 diambil pada Ekspedisi Widya Nusantara menggunakan Kapal Riset Baruna Jaya VIII. Karakteristik sedimen Holosen dan Pleistosen dapat dibedakan dari nilai mean, sorting, skewness dan kurtosis. Batas Holosen – Pleistosen ditentukan berdasarkan kemunculan pertama dari Bolliela Adamsi pada kedalaman 161 cm. Fasies sedimen dalam inti tersebut dibedakan menjadi dua fasies, fasies I berumur Pleistosen Akhir dengan komposisi sedimen berupa perselingan lanau sedang-pasir sangat halus. Fasies II dengan komposisi sedimen berupa lanau kasar dan berumur Holosen. Hasil studi pendahulan ini diharapkan dapat digunakan untuk mengetahui perubahan lingkungan yang terjadi selama Pleistosen – Holosen.
LAST GLACIAL MAXIMUM – HOLOCENE RAINFALL SHIFTS IN THE WESTERN SAVU STRAIT BASED ON GEOCHEMICAL PROXIES Ardi, Ryan Dwi Wahyu; Aswan, Aswan; Maryunani, Khoiril Anwar; Yulianto, Eko; Putra, Purna Sulastya; Nugroho, Septriono Hari; Nurhidayah, Efrilia Mahdilah
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 2 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i2.493

Abstract

The Indo-Pacific Warm Pool significantly influences global atmospheric circulation, with tropical rainfall patterns highly sensitive to glacial–interglacial climate changes. During the Last Glacial Maximum (LGM), approximately 26,500 years before present, lower insolation, expanded ice sheets, and reduced sea levels weakened the Australian–Indonesian Monsoon (AIM) due to a southward shift of the Intertropical Convergence Zone (ITCZ). In contrast, the Holocene period experienced intensified monsoon systems and increased precipitation. However, high-resolution hydroclimate reconstructions from the western Savu Strait remain scarce. This study reconstructs rainfall variability from the LGM to the Holocene using geochemical proxies from sediment core ST10 (at 1 cm interval), located in the western Savu Strait. Three elemental ratios (Ti/Ca, K/Ca, and Rb/Sr) from X-ray fluorescence (XRF) core scanning were used to indicate terrigenous input, chemical weathering, and fluvial discharge. The age model was established using radiocarbon dating and stable isotope alignment with the Greenland ice core δ¹⁸O record. Log-transformed elemental ratios reveal four intervals of increased rainfall: the LGM, Heinrich Event 1 (HE1), Younger Dryas to Early Holocene, and the Late Holocene. These periods are characterized by elevated Ti/Ca, K/Ca, and Rb/Sr values, suggesting enhanced monsoonal rainfall and continental runoff. Conversely, lower proxy values during the Early Deglaciation, Bølling–Allerød, and Mid-Holocene indicate drier climatic conditions. These patterns align with regional proxy records from southwest Sumba and the Timor Sea, confirming the reliability of elemental ratios in reconstructing past hydroclimate variability. This study provides the first continuous record of rainfall shifts in the western Savu Strait from the LGM to Holocene and contributes to understanding long-term monsoon dynamics in southeastern Indonesia, highlighting the complex response of tropical hydroclimate to global climate forcing.
Co-Authors A.A. Ketut Agung Cahyawan W Ardi, Ryan Dwi Wahyu Astriandhita, Karina Melias Aswan Aswan Budi Muljana Damanik, Adrianus EKO YULIANTO Hari Nugroho, Septriono Maryunani, Khoiril Anwar Nurhidayah, Efrilia Mahdilah Pamungkas, Ageng Digdya Garin Praptisih Praptisih Praptisih, . Puteri, Winda Eka Mandiri Septriono Hari Nugroho Winantris Winantris