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All Journal JGE (Jurnal Geofisika Eksplorasi) Jurnal Kelautan Tropis Journal of Tropical Biodiversity and Biotechnology Jurnal Geosains dan Teknologi
Nurhidayah, Efrilia Mahdilah
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Energy Engineering Environmental Science Immunology & microbiology

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Nannoplankton Biostratigraphy from Banggai-Sula Basin, Central Sulawesi Nurhidayah, Efrilia Mahdilah; Akmaluddin, Akmaluddin; Barianto, Didit Hadi; Husein, Salahuddin; Saripudin, Asep
Journal of Tropical Biodiversity and Biotechnology Vol 9, No 1 (2024): March
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jtbb.85308

Abstract

The nannoplankton research was conducted in the MH-2 well, Banggai-Sula Basin, Central Sulawesi. Thirty-four ditch-cutting samples were utilized to observe the Minahaki, Kintom, and Biak Formations. Age determination was carried out using biostratigraphy method and standard procedure for first and last occurrence of nannoplankton biodatum and had an absolute age, widely known as a zone indicator.  This study aims to determine the age and nannoplankton biozonation of each geological formation in Banggai-Sula Basin. Based on the biostratigraphic analysis, 39 species from 14 genera with abundance frequencies ranging from rare to abundant were found in the MH-2 well. In this study, new results of the age of Banggai-Sula Basin areMiddle Miocene – Early Middle Pliocene (13,706 – 3,727 Ma), and can identify into six calcareous nannoplankton zones that are more detailed than previous researchers, Discoaster signus zone (NN5), Discoaster exilis zone (NN6-NN7), Discoaster berggrenii zone (NN11), Ceratolithus acustus zone (NN12), Helicosphaera sellii zone (NN13-NN15), and the Discoaster tamalis zone (NN16). Biostratigraphic data also shows new information for the first time, the absence of three zones from zone NN8 to zone NN10. This result indicates an unconformity in the Late Miocene age (10.606–8.20 Ma). 
Microfacies and paleoenvironmental study of Limestone of the Peneta Formation from Kerinci Area Akmaluddin, Akmaluddin; Nurhidayah, Efrilia Mahdilah; Agustin, Muhammad Virgiawan; Wirakusuma, Fadhil; Novian, Moch. Indra; Barianto, Didit Hadi
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22263

Abstract

The research location is the Tebing Tinggi Village, Kerinci region - Jambi, part of the Barisan Zone. This study focuses on the limestone of the Peneta Formation, which is part of the Pre-Tertiary age. The research will investigate the characteristics of carbonate rocks in the Peneta Formation, including the developed facies, fossil content, and the diagenesis process in the Peneta Formation using field data, petrography, and XRD. Our research has succeeded in dividing the Limestone of the Peneta Formation into 3 lithofacies in the study area, including dismicrite, dolomitic limestone, and meta-mudstone. The lack of marine organisms and the dominance of the mudstone facies indicate that the limestone of the Peneta Formation was deposited in an evaporite or brackish zone environment. The limestone diagenesis process was also confirmed in this study. The research location is included in the mesogenesis stage due to the presence of foliation structures, decussate texture, and dolomite minerals until the telogenesis stage, which is characterized by sparite calcite blocky. Furthermore, forsterite and diaspore minerals were also identified through petrographic and XRD analysis, indicating the occurrence of metamorphic processes at our research location.
Mikrofasies Batugamping Formasi Sentolo, Daerah Karangsari, Kulon Progo, Daerah Istimewa Yogyakarta Nurhidayah, Efrilia Mahdilah; Akmaluddin, Akmaluddin; Ardi, Ryan Dwi Wahyu; Maulida, Nisa' Khofiyan; Sholichah, Wahyunia Mar'atus
Jurnal Geosains dan Teknologi Vol 8, No 1 (2025)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.8.1.2025.49-59

Abstract

Penelitian mikrofasies batugamping Formasi Sentolo dilakukan di daerah Karangsari, Kulon Progo, Yogyakarta. Formasi Sentolo terdiri dari batugamping dan perselingan napal-batugamping. Penelitian ini bertujuan untuk mengetahui variasi mikrofasies dan lingkungan pengendapanpada batugamping di Formasi Sentolo menggunakan analisis petrografi. Analisis dilakukan terhadap sepuluh sampel batugamping menggunakan metode petrografi untuk menginterpretasikan tipe mikrofasies dan lingkungan pengendapan, dengan delapan sampel di antaranya juga dianalisis foraminifera bentik besar untuk menentukan umur relatif. Karakteristik yang paling menonjol pada hasil analisis komposisi batuan adalah melimpahnya fragmen fosil foraminifera bentik besar dan alga. Analisis foraminifera bentik besar pada lokasi penelitian menunjukan umur Miosen (Te5–Tf), berdasarkan kehadiran asosiasi spesies Operculinoides panamensis, Amphistegina bowdenensis, Amphistegina lessonii, Operculina sp., dan Elphidium sp. Dua mikrofasies utama berhasil diidentifikasi, yaitu fasies foraminiferal wackestone yang mewakili lingkungan laut dalam toe-of-slope (FZ3), dan fasies amphistegina grainstone/ packstone yang mencerminkan lingkungan open marine (FZ7) pada bagian backreef. Perubahan lingkungan pengendapan dari laut dalam menuju laut dangkal mengindikasikan adanya pengaruh fluktuasi muka air laut serta kontrol morfologi sisa gunungapi purba terhadap sistem pengendapan karbonat di Pegunungan Kulon Progo.
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 Agustin, Muhammad Virgiawan Akmaluddin Akmaluddin Ardi, Ryan Dwi Wahyu Aswan Aswan Didit Hadi Barianto EKO YULIANTO Husein, Salahuddin Maryunani, Khoiril Anwar Maulida, Nisa' Khofiyan Mochammad Indra Novian Purna Sulastya Putra, Purna Sulastya Saripudin, Asep Septriono Hari Nugroho Sholichah, Wahyunia Mar'atus Wirakusuma, Fadhil