PENAFSIRAN DINAMIKA SEDIMENTASI DENGAN METODE ANALISIS LITOFASIES PADA FORMASI SONDE, DI JALUR SUNGAI KEDAWUNG, KECAMATAN MONDOKAN, KABUPATEN SRAGEN, PROVINSI JAWA TENGAH
Total View This Week117
Total View This Week117
Institusion
Universitas Gadjah Mada
Author
Subject
S1 TEKNIK GEOLOGI
Datestamp
2019-07-16 00:00:00
Abstract :
(ABSTRAKSI) Formasi Sonde pada jalur Sungai Kedawung, Kecamatan Mondokan, Kabupaten Sragen, Jawa Tengah, tersusun atas batuan yang sangat bervariasi, seperti batugamping klastik, napal, dan batulempung. Penelitian ini dilakukan untuk mengetahui dinamika sedimentasi Formasi Sonde yang berada di wilayah barat Zona Kendeng. Pengukuran stratigrafi dimulai dari Formasi Kalibeng sebagai batas bawah Formasi Sonde, dan diakhiri oleh Formasi Pucangan pada bagian atasnya. Pembagian fasies didasarkan pada pengamatan batuan secara megaskopis, yang meliputi jenis litologi dan struktur sedimen. Pengamatan petrografis batuan pada 15 sampel dilakukan untuk membantu menentukan jenis komposisi tiap fasies, serta pengamatan foraminifera kecil bentonik dilakukan untuk mengetahui paleobathimetri tiap lingkungan pengendapannya. Daerah penelitian dapat dibagi menjadi 9 fasies, yaitu fasies grainstone berlapis sejajar (Gm), fasies napal (Mm), fasies packstone (Pm), fasies grainstone silangsiur palung (Gt), fasies rudstone berlapis sejajar (Rm), fasies batulempung berlapis sejajar (Cm), fasies rudstone silangsur sejajar (Rp), fasies batulempung masif (Cms), dan fasies wackstone (Wm). Daerah penelitian dapat dibagi menjadi 6 asosiasi fasies, yaitu Asosiasi fasies A mewakili lingkungan pengendapan pantai zona subtidal bawah, open marine, Asosiasi fasies B mewakili lingkungan pengendapan pantai zona subtidal bawah-subtidal atas, Asosiasi fasies C mewakili lingkungan pengendapan pantai zona subtidal bawah, open platform, Asosiasi fasies D mewakili lingkungan pengendapan pantai zona subtidal bawah-intertidal, dan Asosiasi fasies E mewakili lingkungan pengendapan pantai zona intertidal, pond. Berdasarkan interpretasi tumpukan sedimen dan data paleobathimetri, batuan yang berada di daerah penelitian terendapkan pada lingkungan peritidal dengan kedalaman +20-0 meter. Pengendapan sedimen berjalan secara dinamis, namun perubahan lingkungan pengendapan tersebut terjadi pada daerah pantai zona subtidal hingga intertidal. (ABSTRACT) Sonde Formation on the Kedawung River, Mondokan, Sragen, Central Java, is composed by very widely variation of rocks, such as clastic limestone, marl, and also claystone. This study was conducted to determine the sedimentation dynamics of Sonde Formation that located in the western region of Kendeng Zone. Stratigraphy measurement starts from Kalibeng Formation as the lower boundary of Sonde Formation, and is terminated by Pucangan Formation at the top. The facies differentiation is based on the megascopic observation of rocks, which includes the type of lithology and sedimentary structures. Rock petrographic observations on 15 samples was conducted to help determine the composition of each facies, and the paleobathymetri data was conducted to help determine each depositional environment. The study area can be divided into 9 facies, there are horizontal bedded limestone facies (Gm), marl facies (Mm), packstone facies (Pm), trough crossbeded grainstone facies (Gt), horizontal bedded rudstone facies (Rm), horizontal bedded claystone facies (Cm), parallel crossbeded rudstone facies (Rp), massive claystone facies (Cms), and wackstone facies (Wm). The study area can be divided into 6 facies associations, there are Facies Association A represents Beach, lower subtidal zone, open marine; Facies Association B represents Beach, lower subtidal-upper subtidal zone; Facies Association C represents Beach, lower subtidal zone, open platform; Facies Association D represents Beach, lower subtidal-intertidal zone; and Facies Association E represents Beach, intertidal zone, pond. Based on the interpretation of sediment and paleobathimetry data, litologhy of the study area deposited in peritidal environment with depth + 20-0 meters. Sediment in the study area was deposited dynamically, however this sedimentary environment just happened around the subtidal to intertidal zone of the Beach.
(ABSTRAKSI) Formasi Sonde pada jalur Sungai Kedawung, Kecamatan Mondokan, Kabupaten Sragen, Jawa Tengah, tersusun atas batuan yang sangat bervariasi, seperti batugamping klastik, napal, dan batulempung. Penelitian ini dilakukan untuk mengetahui dinamika sedimentasi Formasi Sonde yang berada di wilayah barat Zona Kendeng. Pengukuran stratigrafi dimulai dari Formasi Kalibeng sebagai batas bawah Formasi Sonde, dan diakhiri oleh Formasi Pucangan pada bagian atasnya. Pembagian fasies didasarkan pada pengamatan batuan secara megaskopis, yang meliputi jenis litologi dan struktur sedimen. Pengamatan petrografis batuan pada 15 sampel dilakukan untuk membantu menentukan jenis komposisi tiap fasies, serta pengamatan foraminifera kecil bentonik dilakukan untuk mengetahui paleobathimetri tiap lingkungan pengendapannya. Daerah penelitian dapat dibagi menjadi 9 fasies, yaitu fasies grainstone berlapis sejajar (Gm), fasies napal (Mm), fasies packstone (Pm), fasies grainstone silangsiur palung (Gt), fasies rudstone berlapis sejajar (Rm), fasies batulempung berlapis sejajar (Cm), fasies rudstone silangsur sejajar (Rp), fasies batulempung masif (Cms), dan fasies wackstone (Wm). Daerah penelitian dapat dibagi menjadi 6 asosiasi fasies, yaitu Asosiasi fasies A mewakili lingkungan pengendapan pantai zona subtidal bawah, open marine, Asosiasi fasies B mewakili lingkungan pengendapan pantai zona subtidal bawah-subtidal atas, Asosiasi fasies C mewakili lingkungan pengendapan pantai zona subtidal bawah, open platform, Asosiasi fasies D mewakili lingkungan pengendapan pantai zona subtidal bawah-intertidal, dan Asosiasi fasies E mewakili lingkungan pengendapan pantai zona intertidal, pond. Berdasarkan interpretasi tumpukan sedimen dan data paleobathimetri, batuan yang berada di daerah penelitian terendapkan pada lingkungan peritidal dengan kedalaman +20-0 meter. Pengendapan sedimen berjalan secara dinamis, namun perubahan lingkungan pengendapan tersebut terjadi pada daerah pantai zona subtidal hingga intertidal. (ABSTRACT) Sonde Formation on the Kedawung River, Mondokan, Sragen, Central Java, is composed by very widely variation of rocks, such as clastic limestone, marl, and also claystone. This study was conducted to determine the sedimentation dynamics of Sonde Formation that located in the western region of Kendeng Zone. Stratigraphy measurement starts from Kalibeng Formation as the lower boundary of Sonde Formation, and is terminated by Pucangan Formation at the top. The facies differentiation is based on the megascopic observation of rocks, which includes the type of lithology and sedimentary structures. Rock petrographic observations on 15 samples was conducted to help determine the composition of each facies, and the paleobathymetri data was conducted to help determine each depositional environment. The study area can be divided into 9 facies, there are horizontal bedded limestone facies (Gm), marl facies (Mm), packstone facies (Pm), trough crossbeded grainstone facies (Gt), horizontal bedded rudstone facies (Rm), horizontal bedded claystone facies (Cm), parallel crossbeded rudstone facies (Rp), massive claystone facies (Cms), and wackstone facies (Wm). The study area can be divided into 6 facies associations, there are Facies Association A represents Beach, lower subtidal zone, open marine; Facies Association B represents Beach, lower subtidal-upper subtidal zone; Facies Association C represents Beach, lower subtidal zone, open platform; Facies Association D represents Beach, lower subtidal-intertidal zone; and Facies Association E represents Beach, intertidal zone, pond. Based on the interpretation of sediment and paleobathimetry data, litologhy of the study area deposited in peritidal environment with depth + 20-0 meters. Sediment in the study area was deposited dynamically, however this sedimentary environment just happened around the subtidal to intertidal zone of the Beach.
Download
book
BibTex
Latex, Jabref
cloud_download
Original Resource
url resource Institution
