Geologi daerah ambarawa dan sekitarnya, Kecamatan Ambarawa, Kabupaten Semarang, Provinsi Jawa TengahH PETA RUPA BUMI DIGITAL INDONESIA Lembar Sumowono 1408-54, Lembar Ungaran 1408-54, Lembar Grabag 1408-523 Koordinat : 42o62’00’’ – 92o05’100”BT 43o22’16” – 91o96’100”LS

OLLA, NOVIANDUS PAULO (2024) Geologi daerah ambarawa dan sekitarnya, Kecamatan Ambarawa, Kabupaten Semarang, Provinsi Jawa TengahH PETA RUPA BUMI DIGITAL INDONESIA Lembar Sumowono 1408-54, Lembar Ungaran 1408-54, Lembar Grabag 1408-523 Koordinat : 42o62’00’’ – 92o05’100”BT 43o22’16” – 91o96’100”LS. Other thesis, Institut Teknologi Nasional Yogyakarta.

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Abstract

The geology of the Ambarawa region and its surroundings was chosen as the geological mapping area because the research area is a natural geological laboratory which is quite interesting for research. This is because the area is included in the physiography of the Central Zone/Volcanic Depression Zone, which is genetically formed due to endogenic activities in the form of tectonics, magmatism, volcanism and exogenic processes are caused by the fact that in the area there is the Ungaran volcano which is of Quaternary age. On the other hand, much research has been carried out regarding morphology, lithology, stratigraphy and geological structure, but is generally based on regional problems. This research was conducted in the Ambarawa area and its surroundings, Ambarawa District, Semarang Regency, Central Java Province. This mapping was carried out using a surface mapping method by looking at rock outcrop data, rock distribution, geomorphology and physical characteristics of rocks. This concept is called the lithostratigraphic concept. Based on the results of the Geology of the Research Area, namely: The geomorphology formed in the research area is the volcanic morphological unit of volcanic slopes, the morphological unit of denudational mountains and hills, and the fluvial terrace geomorphological unit. Meanwhile, in Regional Geology, the researcher found 3 rock formations and 1 breakthrough rock and 1 deposit, from the order of old to young, namely: breccia-andesite lithic arenite rock unit of calliget formation, intrusive-andesite rock unit, porphyroophanitic andesite rock unit of Gajah mungkur formation, andesite rock unit Ungaran faneric, and alluvial deposit units. The environmental geology of the research area which is the source studied is divided into two, namely: positive sources. All land in the research area is used as agricultural land, livestock and geotourism. A negative source that was formed in the study area was landslides and some denudational mountainous and hilly areas, including areas where clean water is difficult = Geologi Wilayah Ambarawa dan sekitarnya dipilih sebagai daerah pemetaan geologi karena daerah penelitian termasuk laboratorium alam geologi yang cukup menarik untuk dilakukan penelitian, hal ini dikarenakan daerah tersebut termasuk ke dalam fisiografi Zona Tengah/Zona Depresi Vulkanik, yang secara genetik terbentuk akibat adanya kegiatan endogenik yang berupa tektonik, magmatisme, volkanisme dan proses eksogenik sehingga disebabkan karena pada daerah terdapat gunung api Ungaran yang berumur Kuarter. Disisi lain, penelitian terkait morfologi, litologi, stratigrafi, struktur geologinya sudah banyak dilakukan, namun umumnya mendasarkan pada permasalahan yang bersifat Regional. Penelitian ini dilakukan pada Daerah Ambarawa dan sekitarnya, Kecamatan Ambarawa Kabupaten Semarang, Provinsi Jawa Tengah. Pemetaan ini dilakukan dengan metode pemetaan permukaan dengan melihat data singkapan batuan, sebaran batuan, geomorfologi dan cirik fisik batuan. Konsep ini dinamakan dengan konsep litostratigrafi. Berdasarkan hasil Geologi Daerah Penelitian yaitu : Geomorfologi yang terbentuk pada daerah penelitian adalah Satuan morfologi vulkanik lereng gunung api, satuan morfologi pegunungan dan perbukitan denudasional, dan satuan geomorfologi teras fluvial. Sedangkan pada Geologi Daerah Peneliti mendapatkan 3 formasi batuan dan 1 batuan terobosan serta 1 endapan, dari urutan tua ke muda yaitu: satuan batuan breksiandesit lithic arenite formasi Kaligetas, satuan batuan intrusi-andesit, satuan batuan andesit porfiroafanitik formasi Gajah Mungkur, satuan batuan andesit fanerik Ungaran, dan satuan endapan aluvial. Geologi lingkungan daerah penelitian yang menjadi sesumber yang diteliti di bedakan menjadi dua yaitu: sesumber positif semua lahan di daerah penelitian di manfaatkan sebagai lahan pertanian, peternakan dan geowisata. Sesumber negatif yang terbentuk pada daerah telitian berupa tanah longsor dan sebagian daerah pegunungan dan perbukitan denudasional termasuk daerah sulita air bersih.

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