Fasies dan Lingkungan Pengendapan Formasi Jonggrangan pada Jalur Lintasan Sentul-Gunung Jonggol, Pegunungan Kulon Progo Bagian Timur

Herning Dyah Kusuma, Hanindya Ramadhani, Mochamad Indra Novian, Muhammad Amirul Furqon, Yoga Arimawan, Irra Aprilia Citra

Abstract


Formasi Jonggrangan tersingkap dengan baik di daerah Sentul- Gunung Jonggol, bagian timur dari Pegunungan Kulon Progo. Terbatasnya informasi stratigrafi rinci mengenai Formasi Jonggrangan menyebabkan sejarah pengendapan formasi ini masih menjadi topik menarik untuk diteliti. Pengukuran stratigrafi serta analisa petrografi dan paleontologi telah dilakukan di area ini untuk mengetahui fasies dan memprediksi lingkungan pembentukannya. Berdasarkan karakter fisik dan biotanya Formasi Jonggrangan di daerah penelitian dapat dibagi menjadi 6 fasies batuan, yakni fasies tuff, fasies batupasir karbonatan, fasies batugamping pasiran, fasies batugamping koral/rudstone, fasies algal bindstone-coraline framestone dan fasies konglomerat polimik. Lingkungan pengendapan Formasi Jonggrangan diinterpretasikan berada pada daerah interior normal marine, reef crest/margin and reef slope. Hasil analisis fosil foraminifera mengindikasikan pengendapan formasi ini dimulai pada Miosen Awal (N4) dan diakhiri di Miosen Tengah (N9).

The Jonggrangan Formation are well exposed in the Sentul - Gunung Jonggol area, at the eastern part of Kulon Progo Mountain. Limited detailed stratigraphic information causes the evolution of the depositional of the formation is an interesting topic to study. Stratigraphic measurement along with petrographic and paleontology analyses of this formation have been carried out to identify their facies and predict the development of depositional environment. Based on the physical character and content of the biota, the Jonggrangan Formation can be grouped into 6 facies tuff facies, allochemic sandstone facies, sandy limestone facies, rudstone facies, algal bindstone-coraline framestone facies and polymict conglomerate facies. The depositional environment of Jonggrangan Formation are in the platform of interior normal marine, reef crest/margin and reef slope. Result of the foramminifera fossil anaysis indicates that the deposition of this formation started in the Early Miocene (N4) and terminated in the Middle Miocene (N9).

 


Keywords


Jonggrangan Formation, facies, depositional environment, Kulon Progo

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DOI: http://dx.doi.org/10.14203/risetgeotam2019.v29.1002

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