RODHI, Achmad and INDRAJAYA, Edi and PRASETYADI, Carolus and SETIAWAN, Jatmika and PRATIKNYO, Puji (2016) FRACTURES CONTROL OF GROUNDWATER AQUIFER CONFIGURATION AT BATURAGUNG VOLCANIC RANGE, A POTENTIAL NEW GEOSITE OF GUNUNG SEWU GEOPARK. In: Regional Geoheritage Conference 2016 the 9 Th Indonesia-Malaysia Conference, 24-25 November 2016, Yogyakarta.
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Abstract
The residual of the natural rock erosion in the Baturagung range area of Gunung Kidul exhibit a cuesta of volcanic sedimentary rock is incredible. In preliminary studies indicate that the remains cuesta has a close relationship with the local faults pattern and major fault structure in the ENE-WSW trending which has been named as Dukuh and Mertelu faults by Lestanto Budiman (1990), and Sudarno (1997). The presence of so many major, meso and minor faults in the cuesta , it shows that this minor and meso faults in the major fault system that has developed imbricated graben and horst in a relatively long period. This study used detailed research methodology with detailed data acquisition along the cuesta. As expected found sufficient data for analysis fault zone and faulted rock. In this detailed trajectory represented 3 blocks of detailed observations. Field observations, resistivity geo-electrical, and Pole-dipole geo-electric method show that not at all region have same faults pattern in the cuesta. In each block region observation, they usually have several combinations of minor, meso and major faults variation. The first block, varies from minor, meso, major and nothing fractures with fault plane generally steeply dipping to the SSE. Their fault plane ranging from steeply to very steeply dipping and commonly associated with E-W half graben faults. The second block varies from meso, minor and nothing fractures with fault plane generally steeply dipping to the north or south. They are commonly called synthetic-antitethic normal fault, and parallel with major fault. Transposition of layering during deformation is not uncommon and the occurences of high-strain zone of horst fault suggest that the deformation were derived from intense NNW-SSE tention. The third block, always follow system of NNW-SSE tention fault and commonly associated with steeply dipping ENE-WSW half graben. The varies structures in the all blocks is produced by footwall collapse on half grabens system. Baturagung groundwater basin are compiled by some rock formations and also fractures which is as a controller of recharge and discharge areas. There are three rock formations that have properties permeability rock with unfavorable ie Kebobutak Formation, Semilir Formation and Nglanggran Formation. Fracture patterns that develops relatively leads North-South and East-West, which is where the pattern of North-South is controllers of a recharge area while the fracture pattern with alignment relative direction West-East is a fracture pattern which controls a discharge area. The physical dimension of the mountain range, the geological history of the structures and the aesthetic beauty of panoramic landscape it produced make the Baturagung miosen volcanic range a unique cuesta geoheritage resources not only to Indonesia but also in the world especially for tropical countries where intense weathering will rapidly transform rocks into thick soil in very short time.
| Item Type: | Conference or Workshop Item (Paper) |
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| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Ir. MT PUJI PRATIKNYO |
| Date Deposited: | 19 Jul 2017 09:23 |
| Last Modified: | 24 Jul 2017 08:25 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/12359 |
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