Caldera of Godean, Sleman, Yogyakarta: A Volcanic Geomorphology Review

Forum Geografi

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Title Caldera of Godean, Sleman, Yogyakarta: A Volcanic Geomorphology Review
 
Creator Hartono, Hill Gendoet
Sudradjat, Adjat
Verdiansyah, Okki
 
Subject Geology and Volcanology
Earthquake; Prediction; Southern Mountains;Yogyakarta; Stratigraphic
Volcanic Geomorphology
 
Description Godean hills is located approximately 10 km westward from the Yogyakarta City. The landscape of Godean hills and plains is affected by various factors, such as lithology, geological structure, and sub-aerial process. The purpose of this study was to reveal the landscape of Godean. The method consisted of field study, morphological variables assessment, rock sampling, and laboratory analysis. The results of field mapping indicated that the landscape of Godean  is an isolated hill with a steep slope of >40° and an elevation of +231 m a.s.l, passed by the rivers flows from northeast to southwest that disembogue into the west part of Kulon Progo. The morphologhy of Godean hills varies including G. (Gunung/Mountain) So (+173 m amsl), G. Gede (+218 m a.s.l), G. Wungkal (+187 m a.s.l), G. Butak (+154 m a.s.l), and G. Berjo ( + 175 m a.s.l), dominated by the lithology of igneous rock, which is composed of porphyry andesite-microdiorite, pumice lapilli, and quartz rich lapilli-tuff. In addition, most of the igneous rocks have weathered and have been altered to clays, while the deposition from Merapi volcano formed a landscape with an altitude between +100–+150 m a.s.l surrounding Godean hills. Sentolo Formation was found in Kembang, Bantul, which is located approximately ±5km in the south of the study area N93ºE/12º,  while the distribution in the southwest and northeast relatively covers the Godean hills in curve shape. The results of the analysis provide information related with Godean landscape that it is the remains of the volcanic caldera, with various igneous rock types and volcaniclastics deposits, as well as endured the occurrences of hydrothermal alteration and mineralization. Further geophysical research is required to determine the configuration of igneous rocks under the earth's surface.
 
Publisher Universitas Muhammadiyah Surakarta
 
Contributor Sekolah Tinggi Teknologi Nasional Yogyakarta
 
Date 2017-07-01
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion


 
Format application/pdf
text/html
 
Identifier http://journals.ums.ac.id/index.php/fg/article/view/2821
10.23917/forgeo.v31i1.2821
 
Source Forum Geografi; Vol 31, No 1 (2017): July 2017; 138 - 147
2460-3945
0852-0682
 
Language eng
 
Relation http://journals.ums.ac.id/index.php/fg/article/view/2821/3299
http://journals.ums.ac.id/index.php/fg/article/view/2821/2844
http://journals.ums.ac.id/index.php/fg/article/downloadSuppFile/2821/189
http://journals.ums.ac.id/index.php/fg/article/downloadSuppFile/2821/190
 
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Rights Copyright (c) 2017 hill gendoet hartono
http://creativecommons.org/licenses/by-nc-nd/4.0
 

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