APLIKASI LINEANMENT DENSITY ANALYSIS UNTUK MEMBATASI POLA KALDERA PURBA GODEAN
Keywords:lineament, caldera, volcano, GIS, yogyakarta
Godean area, is an isolated hills that’s occurs on Yogyakarta basin. Volcano occurences in Godean have issued by morphology, lithology and volcanic concepts. Volcanisme and magmatisme on Godean interpreted have similarity with Gajahmungkur – Wonogiri with hydrothermal event occurs. Lineanment Density Analysis used for interpretating the specific pattern, for strength the morphology and geological that have interpreted before. The methods that we used is combining of quantitative and qualitative. Geology of Godean consist of igneous and sedimentary rock with margins of Kulon Progo hill in western side. Caldera morphology, commonly have circular or a half circular pattern, with limited by steep relief. Morphology of Godean have caldera pattern, as a concept and compare with others. LD analysis are using image from slope directional angle processing on SRTM and ASRTER image, and then extract to lineament. Result of lineament extraction there are 9490 lines. Range of density with length from 0 to 9173,21 m/km2 with high value > 2375 m/km2 and count of lineament from 0 to 23 line/km2 with high value > 8 line/km2. Godean have high density with range of length 1930 – 2996 m/km2 or range of counts 9 – 12 line/km2. Base on the pattern, its looks the Godean and surrounding it differ on 3 major sectors, that’s outer rim, secondary rim, and circular of late central eruption. Diameter of this pattern is wide (8 – 15 km), that must be proven with others geological and geophysical subsurface research.
Batson, R.M., Edwards. K. and Eliason, E.M. (1975) “Computer – generated shaded- relief Images”, Journal Research U.S. Geological Survey 3 (4): 401-408
Barianto, D., H., Aboud E., Setijadji, L., D., 2009, Structural Analysis using Landsat TM, Gravity Data, and Paleontological Data from Tertiary Rocks in Yogyakarta, Indonesia, Memoirs of the Faculty of Engineering, Kyushu University, Vol.69, No.2, June 2009
Gupta, R.P. (1991) “Remote Sensing Geology”, Berlin, Heidelberg: Springer-Verlag
Hubbard, B.E., Mack, T.J., and Thompson, A.L., (2012), Lineament analysis of mineral areas of interest in Afghanistan: U.S. Geological Survey Open-File Report 2012–1048, 28 p., http://pubs.usgs.gov/of/2012/1048.
Hartono, H., G., Sudrajat, A., Verdiansyah, O., 2016, Caldera Of Godean, Sleman, Yogyakarta: An Volcanic Geomorphology Review, JGUMS
O’Leary, D. W., Friedman, J. D., and Pohn, H. A. (1976) “Lineament, linear, lineation: Some proposed new standards for old terms”, Geological Society America Bulletin 87: 1463-1469.
PCI Geomatica, (2013), PCI Geomatica user’s guide, Ontario. Canada: Richmond Hill
Rahardjo, W., Sukandarrumidi, Rosidi, (1997), Peta Geologi Lembar Yogyakarta, PSG, Bandung
Syafri, I., Budiadi, E., Sudrajat, A., 2013, Geotectonic Configuration of Kulon Progo Area, Yogyakarta. Indonesian Journal of Geology, Vol. 8, No. 4, p 185-190.
Sudarno, Ign., Kendali tektonik terhadap pembentukan struktur pada batuan Paleogen dan Neogen di Pegunungan Selatan, Daerah Istimewa Yogyakarta dan sekitarnya., Thesis S2, Intitut Teknologi Bandung, 1999.
Thannoun, R.G., (2013), Automatic Extraction and Geospatial Analysis of Lineaments and their Tectonic Significance in some areas of Northern Iraq using Remote Sensing Techniques and GIS, International Journal Of Enhanced Research In Science Technology & Engineering Bulletin, Vol. 2
Winardi, S., Toha, B., Imron, M., Amijaya, D., H., 2013, The Potential of Eocene Shale of Nanggulan Formation as a Hydrocarbon Source Rock,Indonesian Journal of Geology, Vol. 8, No. 1, p 13-23.
Verdiansyah, O., 2016, Alterasi Hidrotermal dan Mineralisasi Logam Berharga di Cekungan Yogyakarta sebuah pemikiran dari kehadiran sistem hidrotermal di daerah Godean, Prosiding Seminar Nasional FTG Unpad Vol 2 No.3