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All Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geosains dan Teknologi
Wicitra, Annisa Puspa
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Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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Analisis Perbandingan Transportasi Sedimen Menggunakan Metode Granulometri pada Sungai Damar Section Hulu dan Hilir Kabupaten Kendal Wicitra, Annisa Puspa; Taufiqi, Khoirul; Rianawati, Ranita Fitri; Jayanti, Anita Galih Ringga
Jurnal Geosains dan Teknologi Vol 7, No 1 (2024): April 2024
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.7.1.2024.62-74

Abstract

Granulometri merupakan analisis untuk mengidentifikasi ukuran butiran dan hubungannya dengan proses sedimentasi. Penelitian ini dilakukan di aliran Sungai Damar, Kabupaten Kendal, dengan dua titik lokasi pengambilan sampel, yaitu di hulu (Kecamatan Sukorejo) dan hilir (Kecamatan Weleri). Keterdapatan endapan sedimen material vulkanik, material batuan karbonat pada Formasi Kerek, dan aluvial yang terdapat di sepanjang aliran Sungai Damar menjadi cukup menarik untuk mengetahui  proses transportasi sedimen berdasarkan ukuran butiran yang tertransportasi. Metode yang digunakan adalah analisis granulometri cara grafis, untuk mendapatkan nilai sortasi, Skewness, dan Kurtosis. Hasil penelitian menunjukkan aliran Sungai Damar melalui beberapa formasi, seperti Formasi Kaligetas, Formasi Kerek, Formasi Damar, dan Endapan Aluvium. Dari hasil perhitungan didapatkan nilai sortasi kedua sampel dengan sortasi sangat baik, nilai Skewness kedua sampel termasuk ke dalam strongly coarse skewed, sedangkan dari hasil Kurtosis pada bagian hulu termasuk platykurtic, sedangkan bagian hilir termasuk very leptokurtic. Dari hasil transportasi tersebut menunjukkan adanya faktor kontrol lain, seperti kondisi geologi, geomorfologi, dan hidrodinamika mempengaruhi proses transportasi sedimen di Sungai Damar. Formasi geologi pada bagian hulu tingkat erosi lebih tahan daripada bagian hilir. Geomorfologi mencakup bentuklahan struktural berbukit terjal di hulu dan landai di hilir. Hidrodinamika dengan pola aliran dendritik dan cabang sungai pendek yang mempengaruhi transportasi sedimen di wilayah tersebut. Pada bagian hulu, dominan traksi karena kemiringan lereng yang curam, sedangkan dominan saltasi di hilir karena kemiringan lereng yang lebih landai.
Relative Age and Depositional Environment of The Limestone Unit of Karangsambung Formation in Jatibungkus Hill, Kebumen Geopark, Indonesia Kurniasih, Anis; Wicitra, Annisa Puspa; Qadaryati, Nurakhmi; Khorniawan, Wahyu Budhi; Dalimunthe, Hasnan Luthfi; Setyawan, Reddy; Jayanti, Anita Galih Ringga
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.02.27602

Abstract

The Jatibungkus Hill is an isolated karst hill and is one of the olistolith fragments in the Karangsambung Formation deposited as olistostrome deposits. This formation formed above the Luk-Ulo Mélange Complex, one of the geological heritage sites in the Kebumen Geopark. The presence of limestone as a fragment in the olistostrome deposits requires further investigation because its formation history is related to regional geological history. This study aims to determine the relative age and depositional environment of limestone in Jatibungkus Hill based on microfossil analysis through petrographic observations. Of the 39 rock samples obtained during field data collection, 15 rock samples were selected for petrographic analysis. The petrographic analysis is divided into two parts, namely descriptive methods and point counting as the basis for classifying carbonate rocks. Based on the classification results, reef facies analysis was conducted using facies zonation and standard microfacies (SMF) to obtain an overview of the limestone depositional environment. In addition, the types of large foraminifera fossils and algae were also used as a basis for determining the relative age. The lithology found in the research area consist of packstone, rudstone, grainstone, and crystalline limestone. The limestone depositional environment is located in SMF 4, SMF 5, and SMF 6 which are included into FZ 4 (Slope) on a restricted carbonate platform. This facies zone influenced by currents and waves between the storm base wave and the normal base wave. The petrographic analysis showing the domination of large bioclastic grain indicating that the deposition were under a high energy. The influence of waves is also reflected in the mixture of bioclass and lithoclast grains or high-density terrigenous clastics that are observed in most of the samples. This facies contains more quartz clastics and bioclast grains than carbonate mud as consistently observed in the identified samples.The association of large benthic foraminifera fossils and algae indicates that the limestone was formed in Zone Ta1 (Late Paleocene) characterized by the presence of Discocyclina sp., Ranikothalia sp., Nummulites sp., Miscelanea sp., Distichoplax biserialis, and Parachaetes sp. It can be seen that the deposition of the limestone olistolith occured after the initial subduction event which produced the mélange complex in Early Cretaceous.
Co-Authors Dalimunthe, Hasnan Luthfi Jayanti, Anita Galih Ringga Kurniasih, Anis Qadaryati, Nurakhmi Rianawati, Ranita Fitri Setyawan, Reddy Taufiqi, Khoirul Wahyu Budhi Khorniawan