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Nanggulan formation as a roof pendant at the central part ofKulon Progo Mountains, Yogyakarta, Indonesia |
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| รหัสดีโอไอ | |
| Creator | 1. Winarti 2. Al Hussein Flowers Rizqi 3. Emi Sukiyah |
| Title | Nanggulan formation as a roof pendant at the central part ofKulon Progo Mountains, Yogyakarta, Indonesia |
| Publisher | Research and Development Office, Prince of Songkla University |
| Publication Year | 2565 |
| Journal Title | Songklanakarin Journal of Science an Technology (SJST) |
| Journal Vol. | 44 |
| Journal No. | 3 |
| Page no. | 752-759 |
| Keyword | roof pendant, metasediment, fragments, dike, alteration |
| URL Website | https://rdo.psu.ac.th/sjst/index.php |
| ISSN | 0125-3395 |
| Abstract | The Nanggulan Formation sediments form a weakly undulating hill and range in age from the Middle Eocene to theLate Oligocene. In Samigaluh and Sermo areas, a series of sedimentary rocks with small dimensions resembling fragments andforming a steep hilly morphology is exposed. Outcrops are mainly made up of sandstone and claystone interbedded with ligniteintercalation. An outcrop in Sermo-2 found andesite intruding claystone. Claystone is found near rock contact, where it is analteration to metasediment and chlorite is formed. Petrographic data showed the presence of chlorite, pyrite, and kaolinite.Andesite dike is one factor that contributes to the Nanggulan Formation being exposed to the surface. The Nanggulan Formationis a roof pendant above a dike. The implications of the roof pendant are related to the propylitic to argillic of hydrothermalalteration, which produce chlorite, pyrite, illite, and kaolinite minerals. |
