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All Journal Jurnal Pendidikan Fisika Indonesia JURNAL FISIKA Jurnal technoscientia Journal of Geoscience, Engineering, Environment, and Technology Journal of Applied Geospatial Information Dharma Bakti Piston: Journal of Technical Engineering Jurnal Fisika Indonesia JURNAL TEKNOLOGI TECHNOSCIENTIA Jurnal Riset dan Pengabdian Interdisipliner
Desi Kiswiranti
INSTITUT SAINS & TEKNOLOGI AKPRIND YOGYAKARTA JL KALISAHAK NO 28 TROMOL POS 45 KOMPLEKS BALAPAN YOGYAKARTA
Aerospace Engineering Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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Journal : Journal of Geoscience, Engineering, Environment, and Technology

 1 
Volcanism in The Pre-Semilir Formation at Giriloyo Region; Allegedly as Source of Kebo-Butak Formation in the Western Southern Mountains Sri Mulyaningsih; Muchlis Muchlis; Nur W.A.A.T. Heriyadi; Desi Kiswiranti
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 3 (2019): JGEET Vol 04 No 03 : September (2019)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1401.865 KB) | DOI: 10.25299/jgeet.2019.4.3.2262

Abstract

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 distinguished 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 intersecting 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 creamy-brown color intersecting with lava and breccia inserted by calcareous sandstone aged N7-8; dikes, lava and agglomerates with basaltic composition and lava and agglomerates with andesitic composition. Stratigraphically, the volcanic rocks exposed at Giriloyo correlated with the volcanic rocks exposed at Karangtalun (Wukirsari) were under the Semilir Formation, bordered with normal fault N210oE/77o, the hanging wall composed by light grey tuff of Semilir Formation. Gravity analyses found high anomalies below the Semilir Formation exposed at Karangtalun-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 Formation. The petrogenesis of the volcanic rocks will be discussed in further research to interpret magmatological properties, the evolving paleo-volcano, and the absolute age of the rocks.
Volcanic Evolution of the Southern Mountain Neogene Magmatic Belt in Baturagung Range Central Java, Indonesia Mulyaningsih, Sri; Putong, Rahel; Prima, Anka; Hidayah, Radhtya Adzan; Kiswiranti, Desi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.04.18461

Abstract

Various Neogene volcanic rocks associated with calcareous sediments compose the Southern Mountain located from Imogiri at Yogyakarta to Wonogiri at Central Java, Indonesia. The volcanic rocks are concentrated along the north side of the Mountains which was recognized as the Neogene magmatic arc of Java; Baturagung is part of them. The discussion focuses on the relationship between the volcanic features and its basin evolution. The methods were geological fieldwork including measuring sections and collecting samples, thin sections, XRF, AAS, and micropaleontology. More than 13 circular hogbacks, circular valleys, and domes are observed based on the SRTM image. The petrology observed pyroxene-rich basaltic volcanic rocks, dacitic volcanic rocks, andesitic volcanic rocks, coral-rich volcanic breccia. From the bottom to the top, its stratigraphy of the Kebo-Butak Formation that notes basaltic volcanic rocks, pumice-rich lapillistone, and tuff of Early Neogene (before P4-N6) with muddy sandstone above the basalts of N 5-6 (Lower Miocene). The Semilir Formation consists of pumice-rich and dacitic tuff. Andesitic volcanic rocks of the Nglanggeran Formation with inlayer of marl of N 13-14. In the volcanic rocks trace elements show REE-rich (84-140 ppm), higher mobile elements of Sr (~480-602 ppm), medium Rb (22.2-23.7 ppm), and medium La (12-21 ppm), and wide range of immmobile trace elements of Nb ~2.7-7.9 ppm, Zr ~53-171 ppm, P ~840-1300 ppm, higher Ti (4400-4900 ppm), and higher Vanadium (V) of 92-302 ppm. Plot TiO2 vs. Al2O3 into the volcanic rocks indicates those were volcanism within plate boundaries. Plot Ta/Th vs Th/Hf shows continental extensional volcanism to continental arc margin. Plot Nb/Zr vs. Th/Zr explains the transitional zone to continental arc volcanism. The spider diagram shows Rb, Ce, P, Ti, Sr, Zr, and Y strongly metasomatized as a result of the upper continental arc. The chondrite normalized REE shows negative trends for Tb, Tm, Lu, Sm, and Eu and positive trends for Ce, Gd, Zr, and Y, which indicate superimposed volcanism under a submarine environment during the Neogene Period. Stratigraphic sections inform were periodically active volcanism. The Kebo-Butak Formation was formed by multiple volcanoes, some of which were active simultaneously while others were not, though both fall within the Early Neogene age range. Similarly, the Semilir and Nglanggeran Formations were also formed by volcanic activity from several volcanoes that were active at different times and overlapped with each other.
Co-Authors - Sugianto - Sutikno Dewa Gede Eka Setiawan Dina Tania Dzakiya, Nurul H Kirbani H Kirbani, H Hanani, Prita Hidayah, Radhitya Adzan Hidayah, Radhtya Adzan Jayawarsa, A.A. Ketut M. Jamaluddin Muchlis Muchlis Mulyaningsih, Sri N. Hindarto Nur W.A.A.T. Heriyadi Prima, Anka Putong, Rahel Siregar, Sepridawati