Electronic Theses and Dissertation

Kegiatan pemetaan geologi dan analisis provenance batupasir dilakukan di Kecamatan Muara Satu, Kota Lhokseumawe, Provinsi Aceh dengan luas daerah ±25 km². Tepatnya terletak pada koordinat 5º10’17’’-5º13’00’’Lintang Utara dan 97º1’36’’-97º4’19’’Bujur timur. Berdasarkan Peta Geologi Lembar Lhokseumawe (Keats, W. Dkk, 1981) lokasi penelitian terdiri atas dua formasi dan satu endapan yaitu Formasi Julurayeu (QTjr) yang berumur Plio - Plistosen, kemudian ada Formasi Idi (Qpi) yang berumur Plistosen, lalu ada Endapan Alluvium (Qh) yang berumur Holosen hingga sekarang. Tujuan penelitian ini adalah untuk mengetahui kondisi geologi permukaan yang terdiri dari struktur geologi, litologi batuan, bentang alam, dan studi provenance batupasir yang meliputi (tatanan tektonik, dan iklim purba) yang terdapat di lokasi penelitian. Pada penelitian ini akan dilakukannya pengambilan data secara langsung di lapangan dan menganalisis batuan menggunakan metode analisis petrografi. Berdasarkan hasil penelitian terdapat 3 satuan, yaitu satuan batupasir Julurayeu (QTjr), satuan batupasir karbonatan Julurayeu (QTjr), satuan batupasir tufaan Julurayeu (QTjr), satuan endapan Idi (Qpi) dan satuan endapan alluvial (Qh). Litologi yang ditemukan di lapangan berupa batupasir, batupasir tufaan, batupasir karbonatan, batulempung, batulempung karbonatan, konglomerat, endapan Idi, dan endapan alluvial. Sedangkan kondisi bentang alam terdiri atas satuan bentuk lahan denudasional (D1 dan D5), satuan bentuk lahan fluvial (F1), dan satuan bentuk lahan struktural (S1). Berdasarkan hasil pola aliran yaitu pola aliran dendritik dengan kategori sungai berstadia muda. Berdasarkan hasil analisis petrografi dari ke 4 sampel, batupasir di Formasi Julurayeu dinamakan lithic wacke dengan jenis kuarsa monokristalin atau kuarsa kristal tunggal. Berdasarkan hasil analisis provenance batupasir Formasi Julurayeu (QTjr), didapatkan hasil tatatan tektonik berupa zona recycled Orogenic sub zona quartzose recycled dan transitional recycled, dan iklim purba daerah sumbernya berada pada iklim lembab (humid).
Kata kunci : Provenance, Julurayeu, Lithic Wacke, Recycled Orogen, Humid

Geological mapping activities and sandstone provenance analysis were carried out in Muara Satu District, Lhokseumawe City, Aceh Province with an area of ±25 km². Precisely located at coordinates 5º10'17''-5º13'00''North Latitude and 97º1'36''-97º4'19''East Longitude. Based on the Lhokseumawe Geological Map Sheet (Keats, W. Et al., 1981) the research location consists of two formations and one deposit, namely the Julurayeu Formation (QTjr) which is of Plio - Pleistocene age, then there is the Idi Formation (Qpi) which is of Pleistocene age, then there are Alluvium Deposits (Qh) which is from the Holocene to the present. The aim of this research is to determine the surface geological conditions consisting of geological structure, rock lithology, landforms, and sandstone provenance studies which include (tectonic settings and ancient climate) found at the research location. In this research, data collection will be carried out directly in the field and analysis of rocks using petrographic analysis methods. Based on the research results, there are 3 units, namely the Julurayeu sandstone unit (QTjr), the Julurayeu carbonate sandstone unit (QTjr), the Julurayeu tuff sandstone unit (QTjr), the Idi deposit unit (Qpi) and the alluvial deposit unit (Qh). The lithology found in the field is sandstone, tuff sandstone, carbonate sandstone, mudstone, carbonate mudstone, conglomerate, Idi deposits and alluvial deposits. Meanwhile, the landscape conditions consist of denudational landform units (D1 and D5), fluvial landform units (F1), and structural landform units (S1). Based on the results of the flow pattern, namely a dendritic flow pattern with a young stage river category. Based on the results of petrographic analysis of the 4 samples, the sandstone in the Julurayeu Formation is called lithic wacke with a type of monocrystalline quartz or single crystal quartz. Based on the results of the provenance analysis of the Julurayeu Formation (QTjr) sandstone, the tectonic setting results were obtained in the form of a recycled Orogenic zone, a sub-zone of quartzose recycled and transitional recycled, and the ancient climate of the source area was in a humid climate. Keywords: Provenance, Julurayeu, Lithic Wacke, Recycled Orogen, Humid