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GENESA DAN KELIMPAHAN MINERAL LOGAM EMAS, DAN ASOSIASINYA BERDASARKAN ANALISIS PETROGRAFI, DAN ATOMIC ABSORBTION SPECTROPHOTOMETRY (AAS), DI DAERAH SANGON, KABUPATEN KULONPROGO, PROPINSI DIY Purnamawati, Dwi Indah; Tapilatu, Stiwinder Renata
Jurnal Teknologi Vol 5 No 2 (2012): Jurnal Teknologi
Publisher : Jurnal Teknologi, Fakultas Teknologi Industri, Institut Sains & Teknologi AKPRIND Yogyakarta

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Abstract

Tujuan dari penelitian ini adalah untuk mengetahui cara terbentuknya serta kelimpahan mineral logam emas (Au) dan asosiasinya, dari analisis petrografi dan analisis Atomic Absorbtion Spectrophotometry (AAS). Metode penelitian yang dipakai adalah dengan cara penggabungan data lapangan, dan analisis  laboratorium dan pengambilan data sekunder. Analisis petrografi dilakukan untuk mengetahui genesa/pembentukan mineral-mineral logam emas dan asosiasinya. Berdasarkan dari hasil analisis petrografi, menunjukkan bahwa mineralisasi emas dan asosiasinya yang terdapat di Daerah Sangon, Kulonprogo, Daerah Istimewa Yogyakarta, menghasilkan alterasi bertipe propilitik. Sedangkan berdasarkan hasil analisis Atomic Absorbtion Spectrophotometry (AAS), menunjukkan bahwa kandungan/kadar mineral logam Au memiliki kandungan/kadar paling rendah dibandingkan dengan asosiasi mineral logam lainnya. Kadar Au hanya 1,274 ppm atau 0,0001274%.  
TINJAUAN GEOLOGI LINGKUNGAN TERHADAP PENGARUH REMBESAN AIR ASAM KAWAH IJEN DI DAS DAN MATA AIR BANYUPAHIT DESA KALIANYAR KEC. SEMPOL KAB. BONDOWOSO PROP. JAWA TIMUR Perdana, I Gede Arya; Purnamawati, Dwi Indah
Jurnal Teknologi Technoscientia Vol 9 No 2 (2017): Vol 9 No 2 Februari 2017
Publisher : LPPM IST AKPRIND Yogyakarta

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Abstract

The purpose of this research is to know the impacts of environmental pollution of Ijen Crater water in Banyupahit watershed such as health and environmental impacts and to determine the quality of river water and springs in the Banyupahit waterspring, Kalianyar village, Sempol District, Bondowoso Regency, East Java Province. The method of this research conducted by the authors is a field study with direct observation in the field as well as library studies and related references related to the title of the seminar. Data analysis and discussion of this research using chemical analysis approach in the form of elements of pH, Clˉ, SO4ˉ and Fˉ taken on two water samples in the study area. The result of the research, it can be concluded that Banyupahit watershed is not feasible to be used because it has a very acidic water and exceeds the maximum permitted according to the standard of Water Quality Standard according to Government Regulation No. 82/2001 on Water Quality Management and Pollution Control Water Class 1. However, from the analysis on the sample of the springs it can be concluded that the springs downstream of the Banyupahit River can be used for clean water because it does not exceed the maximum quality limit in accordance with Ministry of Health Regulation No. 416/MENKES /PER/IX/1990. Based on the results of the research, it is expected that the people around do not use river water for purposes such as bathing, washing and drinking water consumption because this is very dangerous for health. While the environmental impact caused by acid water along the river basin of Banyupahit is in the form of non-living or not the development of animals around the river such as fish.
AKTIVITAS VULKANISME EKSPLOSIF PENGHASIL FORMASI SEMILIR BAGIAN BAWAH DI DAERAH JETIS IMOGIRI Mulyaningsih, Sri; Husadani, Y T; Umboro, P A; Sanjoto, Siwi; Purnamawati, Dwi Indah
Jurnal Teknologi Technoscientia Vol 4 No 1 (2011): Vol 4 No 1 Agustus 2011
Publisher : LPPM IST AKPRIND Yogyakarta

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Abstract

The widely exposed of volcanic rocks within western part of Central Java-DIY Southern Mountain areas, indicates that volcanic activities had influenced geology of this area. Volcanic-stratigraphic study finds pumiceus rocks, tuff and co-ignimbrite breccias that can be described as primery volcanic rocks at study areas. Those volcanic rocks were erupted explosively followed by collapsing strato cone and forming new caldera. The associate of volcanic rocks with co-ignimbrite breccias, indicates that the central eruption was not far from the outcropes. Shallow intrusive rocks of andecites bearing hornblendes that exposed at the highest cone shape geomorphology of Gunung Gede, south to southwest Sudimoro, might be as the central eruptions.
TINJAUAN DAMPAK BANJIR LAHAR KALI PUTIH, KABUPATEN MAGELANG PASCA ERUPSI MERAPI 2010 Aisyah, Nur; Purnamawati, Dwi Indah
Jurnal Teknologi Technoscientia Vol 5 No 1 (2012): Vol 5 No 1 Agustus 2012
Publisher : LPPM IST AKPRIND Yogyakarta

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Abstract

Potency of Merapi lahars in Putih River, Magelang Regency, is described in terms of management of material deposition. The methode is carried out with the description of material, determination of lahars forming factors, and the geology environmental.  Merapi eruption on 2010 has producted volcanic materials about 130 million metre cubic, spread in the upper river of Merapi Volcano as Gendol River, Apu River, Trising River, Senowo River, Lamat River, Putih River, Bebeng River, Krasak River, Bedog River, Boyong River, Kuning River, Opak River and Woro River. One of the rivers in Magelang regency known Putih River, has material volcanic as much as 8,2 million metre cubic. Lahars which to is grouped materials clasification like sands and rocks varying in size. While impact of lahars which must to beware are debris avalanche, over topping, and flood. Therefore in order to minimize the abuse authority, disaster management covers prevention, emergency response, and rehabilitation after disaster is necessary.