Geotectonic Configuration of Kulon Progo Area, Yogyakarta

Syafri, Ildrem; Budiadi, E.; Sudradjat, A.

doi:10.17014/ijog.v8i4.168

Cited by 10 publications

(12 citation statements)

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“…26418/positron.v7i1.19205 ISSN: 2549-936X (online) masih banyak potensi yang belum dimanfaatkan secara maksimal. Verdiansyah (2016) [5] menyebutkan bahwa perubahan mineralogi dari peningkatan pengaruh hidrotermal yang diikuti adanya keberadaan sulfide (pirit) yang teroksidasi menjadi limonit, pengkayaan mineral lempung berupa kaolinit dan halloysit pada daerah Godean merupakan tanda pelapukan dan perubahan unsur-unsurnya.…”

Section: Pendahuluanunclassified

“…Hal tentang mineralisasi di daerah Godean atau sekitar Gunung Wungkal telah diteliti oleh Verdiansyah (2016) [5] yang menyatakan perubahan unsur-unsur diinterpretasi sebagai faktor adanya perubahan mineralogi dari peningkatan pengaruh hidrotermal yang diikuti pelapukan dengan bukti keberadaan sulfida (pirit) yang teroksidasi menjadi limonit, pengkayaan mineral lempung berupa kaolinit dan halloysit pada daerah Godean. Namun, pada Lintasan 3 bentuknya cenderung berlapis.…”

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Survei Potensi Sumber Daya Geologi yang didukung Data Resistivitas di Gunung Wungkal Yogyakarta

Dzakiya

Nugraha²,

Sidik³

et al. 2017

Positron

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AbstrakSurvei potensi sumber daya geologi di Daerah Gunung Wungkal Yogyakarta yang didukung data resistivitas telah dilakukan. Hasil korelasi data menunjukkan adanya sumber daya berupa bahan galian C yang merupakan hasil lapukan intrusi batuan beku yang kemudian menghasilkan lempung-lempungpasiran (2,71-5,36 Ωm), pasir-batupasir (7,59-45,15 Ωm), lapukan batuan diorit atau breksi andesit (91,49-296,48 Ωm). Ketebalan batuan-batuan tersebut sekitar 225-231 meter berdasarkan penampang peta geologi di permukaan dengan arah sebaran dari Barat Laut hingga Tenggara. Morfologi daerah tersebut terdiri dari perbukitan yang merupakan perbukitan intrusi terdenudasi dan dataran alluvial dengan proses pelapukan serta alterasi yang intensif (alterasi argilik). Litologinya merupakan intrusi Diorit yang kaya akan mineral plagioklas, Breksi Andesit dan endapan Alluvial (endapan Merapi Muda). Adanya perselingan lapisan pasirbatupasir (permeable) dengan lempung hingga lempungpasiran (impermeable) pada model resisitivitas yang didukung informasi sumur warga, didentifikasi sebagai akuifer airtanah yang relatif dangkal. Dugaan keterdapatan mineralisasi dan logam berharga juga dianalisis dari sampel-sampel singkapan batuan dan analisis model resistivitas namun dibutuhkan uji laboratorium lebih lanjut. Kata kunci: gunung wungkal, data resistivitas, sumber daya geologi PendahuluanGunung Wungkal merupakan suatu daerah berbentuk perbukitan dan daratan yang berada di Kecamatan Godean Kabupaten Sleman Yogyakarta. Studi geologi dan geokimia pernah dilakukan oleh peneliti terdahulu yang mengkaji umur, material maupun membahas potensi geologi positif maupun negatif di daerah tersebut. Bronto (2014) [1] menyatakan bahwa Daerah Godean memiliki morfologi perbukitan terisolir akibat pengaruh kontrol denudasional pada batuan beku dan gunungapi. Hasil longsoran raksasa dari Gunung Merapi dan endapan kuarter fluvio-vulkanik membentuk monfologi daratan di sekeliling daerah tersebut. Sedangkan sisa pelapukan dari erosi permukaan menghasilkan tinggian di daerah Godean yang berupa dataran agak bergelombang akibat dari pengendapan material pekat.Bronto (1999) [2] menginterpretasi bahwa Gunung Wungkal merupakan bagian dari gunungapi purba yang berumur Miosen dan seumur dengan jajaran Pegunungan Selatan bagian utara, yaitu antara 11,3-17,2 Jtl. Daerah Godean sendiri memiliki Vulkanisme dan magmatisme yang serupa dengan Gajahmungkur (Wonogiri) dan Menoreh (Magelang), yang disertai tahapan mineralisasi pada bagian fasies pusat erupsinya. Berdasarkan informasi ini, maka dimungkinkan sumber potensi bahan galian industri maupun kandungan logam berharga diperkirakan cukup melimpah.Pengaruh dari pola tektonik berupa sesar turun berarah Barat-Timur dan sesar berarah Selatan-Baratlaut menyebabkan anomali di Godean dan Banguntapan dan adanya perlapisan sedimen diduga karena intrusi (Barianto, dkk., 2009 dalam Winardi, dkk., 2013. Rahardjo, dkk (1997) [4] menyatakan bahwa batuan tertua di daerah penelitian berumur Eosen yang termasuk Formasi Nanggulan (Teon). Formas...

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Section: Pendahuluanunclassified

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Survei Potensi Sumber Daya Geologi yang didukung Data Resistivitas di Gunung Wungkal Yogyakarta

Dzakiya

Nugraha²,

Sidik³

et al. 2017

Positron

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“…Kulon Progo mountains are composed of volcanic rocks, which are dominated by volcanic clastic materials and andesite intrusion (Syafri et al, 2013). Rahardjo et al (1995) named this volcanic rocks as the Old Andesite Formation.…”

Section: Geological Conditionmentioning

confidence: 99%

“…The whole succession was overlain by sandy tuff and limestone and the youngest rock found in the area is quaternary alluvial deposits. The morphology of Kulon Progo mountains forms an elliptical-shape dome (Syafri et al, 2013). The slope with a number of radially pattern faults can be recognized in the Geological Map of Yogyakarta (Rahardjo et al, 1995).…”

Section: Geological Conditionmentioning

confidence: 99%

Landslide Susceptibility Assessment of Kokap Area Using Multiple Logistic Regression

2015

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A number of landslides have occured in Kokap SubDistrict, Kulon Progo Regency, Yogyakarta Special Province, Indonesia, which have influenced the communities. The natural disaster is commonly associated with a few days of heavy rainfall events. To mitigate the impact of landslides in this area, a landslide susceptibility assessment needs to be carried out. The main objective of this research is to develop a landslide susceptibility zonation in the research area by applying a logistic regression (LR) method. Field observation was conducted at 68 locations in the research area, in which 46 landslides occured. Data of slope angle, lithology, geologic structure and groundwater conditions were collected. The relationship between landslide occurrence and the slope angle, lithology, geologic structure and groundwater conditions was analysed using the LR method. The analysis results showed a 0.984 standard error, implying a good-fit model. The study area was classified into very low, low, moderate, high and very high landslide susceptibility zones with 0–20%, 20–40%, 40–60%, 60–80%, and 80–100%, respectively, probabilities of occurrence. A 60% area of the total study area was classified as a moderate to very high susceptibility to landslide. From 47 landslides, 80% landslides occured in high and very high landslide susceptibility zones, 17% landslides occured in the moderate susceptibility zone and 2% landslides occured in the low susceptible zone. None of landslides occured in the very low landslide susceptibility zone. The analysis results show that LR method is a very useful method for landslide prediction. Keywords: landslide susceptibility, multiple logistic regression, Kokap Kulon Progo-Indonesia

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“…Specific morphological expression of the Kulon Progo Mountain [18] is due to the general trend of tectonics since Eocene time. Normal faults, thrust faults and strike-slip faults [11] control the distribution of rocks in Kulon Progo Mountains area.…”

Section: Introductionmentioning

confidence: 99%

Fault lineaments control on disaster potentials in Kulon Progo Mountain Area-Central Java-Indonesia

et al. 2018

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Many inactive fault lineaments developed in Kulon Progo Mountains, which are mainly composed of Oligo-Miocene age (33,9 - 5,3 million years ago) of volcanic rocks. The directions and distributions of the lineaments differ from one part to another. This research was conducted to reveal the fault lineaments on controlling disaster variation of the area. Fault lineaments delineation is done on the area of all Kulon Progo Mountains. Fault lineaments density variation map is made from the fault lineaments. Fault lineaments density variation map that overlaid by slope map will show the result in a relationship between the fault lineaments density and the potential disaster of the area. The result of fault lineaments density analysis shows that high-density values area tend to be landslide and rock slide at the volcanic rocks. High fault lineaments density with relatively low slope percentage has subsidence potential at limestone area in the central part of Kulon Progo mountains. The disaster tends to happen especially in the area of old rock formation with high fault lineaments density.

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Geotectonic Configuration of Kulon Progo Area, Yogyakarta

Cited by 10 publications

References 1 publication

Survei Potensi Sumber Daya Geologi yang didukung Data Resistivitas di Gunung Wungkal Yogyakarta

Survei Potensi Sumber Daya Geologi yang didukung Data Resistivitas di Gunung Wungkal Yogyakarta

Landslide Susceptibility Assessment of Kokap Area Using Multiple Logistic Regression

Fault lineaments control on disaster potentials in Kulon Progo Mountain Area-Central Java-Indonesia

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