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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Adesti Audina Ulfah
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Biostratigrafi dan Kecepatan Sedimentasi, Berdasarkan Foraminifera, Di Formasi Kalibeng, Lintasan III, Kali Kedawung, Sragen, Jawa Tengah Adesti Audina Ulfah
Retii 2022: Prosiding Seminar Nasional ReTII ke-17
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Daerah penelitian termasuk dalam Zona Kendeng, Formasi Kalibeng, Anggota Klitik. Analisis biostratigrafi foraminifera planktonik dilakukan pada 30 sampel dari Lintasan III, Kali Kedawung, Sragen, Jawa Tengah. Hasil analisis tersebut diperoleh 36 spesies foraminifera planktonik. Zonasi biostratigrafi dibatasi oleh kemunculan awal spesies atau kemunculan akhir spesies. Kisaran umur pada daerah penelitian 4.52 jtl – 3.35 jtl atau Pliosen (N19-N21). Zonasi biostratigrafi daerah penelitian terbagi atas 4 zona dari tua ke muda yaitu zona sphaeroidinellopsis kochi (PL3/N19), zona globorotalia plesiotumida (PL4/N19), zona globoquadrina altispira altispira (PL5/N20), dan zona globorotalia tosaensis (PL6/N21). Berdasarkan perhitungan kecepatan sedimentasi dari crossplot ketebalan vs umur absolut biodatum diperoleh 3 tren kecepatan sedimen. Dari hasil tersebut diketahui daerah penelitian tidak dijumpai ketidak selarasan berdasarkan biodatum foraminifera.
Perubahan Iklim Kala Miosen Akhir Berdasarkan Analisis Palinologi Di Formasi Lemau, Bengkulu Mentari, Sakilla; Wijaya, Muhammad Eval Juni; Adesti Audina Ulfah
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 4 (2025): November
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i4.599

Abstract

Fossil pollen and spores can be used to determine the age and depositional environment of sedimentary rocks, as well as to reconstruct the paleoclimate at the time the rocks were formed. The use of pollen and spores for paleoclimate reconstruction in Sumatra remains limited. This study aims to identify the pollen and spore assemblages of the Lemau Formation and to reconstruct Late Miocene climatic changes based on these assemblages. Sampling was conducted through a measured stratigraphic section at 5–8 cm intervals, and laboratory analysis employed the hydrogen peroxide method. A total of ten rock samples were collected and analyzed. The results indicate that the study area experienced a warm climate with five episodes of humidity variation, interpreted from changes in the abundance of arboreal pollen, non-arboreal pollen, Graminae, spores, and montane pollen. The warm climatic conditions and humidity fluctuations are inferred to be related to the global Middle Miocene Climate Optimum (MMCO) event, as well as to uplift activity of the Bukit Barisan Range in the study area.
Co-Authors Mentari, Sakilla Wijaya, Muhammad Eval Juni