Mulyaningsih, Sri and Muchlis, Muchlis and Heriyadi, Nur W. A. A.T. and Kiswiranti, Desi (2019) V olcanism in The Pre - Semilir Formation at Giriloyo Region; Allegedly as Source of Kebo - Butak Formation in the Western Southern Mountains. Journal of Geoscience, Engineering, Environment, and Technology, 3 No 4 (10). pp. 217-226. ISSN E-ISSN : 2541-5794, P-ISSN : 2503-216X
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Abstract
tract Kebo - Butak Formation was known to be the oldest volcanic rocks limited in regional terms in the lower Baturagung Hills, Gedangsari area, Gunungkidul Regency. The main constituents of the Kebo - Butak Formation consist of intersection of volcanic - clastic rocks and calcareous sediments, locally also found basalt lava with pillow structures; which distinguishe d it from other volcanic rock formations in the Southern Mountains. This study aims to determine the relationship of volcanic rocks exposed in Giriloyo with the Kebo - Butak Formation in the Baturagung Hills ; the chronostratigraphy and the history of volcanic activities that produced the volcanic rocks of Giriloyo . This research was approached by volcanic geological mapping using surface mapping suported by gravity anayses . From the bottom to the top of the frontier areas result volcaniclastic rocks consisting of black tuffs with several fragments of volcanic bombs with basalt composition intersect ing with thin basaltic lava inserted by calcareous claystone having an age of N5 - 7 (Early Miocene); pyroxene - rich basalt volcanic sequence consists of thick layers of tuff with crea my - brown color intersecting with lava an d breccia inserted by calcareous sandstone aged N7 - 8; dikes, lava and agglomerates with basaltic composition and lava and agglomerates with andesitic composition . S tratigraph ically , the volcanic rocks exposed at Giriloyo correlated with the volcanic rocks exposed at Karangtalun (Wukirsari) were under the Semilir Formation , bordered with normal fault N210 o E/77 o , the hanging wall composed by light grey tuff of Semilir Formation . Gravity analyses found high anomalies below the Semilir Formation exposed at Kara ngtalun - Munthuk (east of study area) continued to below the Giriloyo area. The high anomalies were identified as the igneous/ignimbrite volcanic sequence. Descriptively and stratigraphically, the Giriloyo volcanic sequence are a part of Kebo - Butak Formatio n. T he petrogenesis of the volcanic rocks will be discussed in further research to interpret mag matological properties , the evolving paleo - volcano , and the absolut e age of the rocks.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | volcanic rock, Kebo - Butak Formation, black tuffs, basaltic lava, ag g lomerate, and stratigraphy |
| Subjects: | Q Science > QE Geology |
| Divisions: | Fakultas Teknologi Mineral > Teknik Geologi (S1) |
| Depositing User: | Novri Aditya Nugroho |
| Date Deposited: | 06 Jul 2021 07:37 |
| Last Modified: | 15 Oct 2021 01:30 |
| URI: | http://eprints.akprind.ac.id/id/eprint/255 |
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