Electronic Theses and Dissertation

Lokasi penelitian memiliki luas 4 x 6 km² terletak di kecamatan beutong, kabupaten nagan raya, provinsi aceh. daerah penelitian secara geografis pada koordinat 96°25’16,08” lu – 96°27’4,81” lu dan 4°16’0,74” bt - 4°16’4,81” bt. daerah penelitian berdasarkan kondisi geologi berada zona dataran rendah hingga berbukit. zona ini terbentuk dari evolusi tektonik regional sumatera akibat aktivitas subduksi dan pengangkatan di jalur bukit barisan menghasilkan perbedaan relief yang signifikan antara daerah sumber dan daerah akumulasi. wilayah beutong yang berada pada posisi relatif lebih rendah dengan deformasi tektonik lemah hingga sedang berkembang menjadi zona penerima material hasil rombakan batuan dari wilayah yang lebih tinggi. kondisi tersebut memungkinkan tempat terakumulasi emas sekunder endapan fluvial hasil pelapukan dan erosi. hal tersebut diperkuat dengan ditemukannya aktivitas penambangan emas di daerah penelitian. batupasir formasi tutut berperan sebagai media transportasi dan terakumulasi emas sekunder endapan fluvial tersebut. sehingga penelitian analisis batuan asal (provenance) menjadi penting untuk dikaji untuk mengetahui tatanan tektonik, sumber batuan asal, dan sedimentasi yang telah terjadi. dominasi keberadaan batupasir di wilayah penelitian serta keterbatasan informasi terkait rekontruksi tektonik, menjadikan studi provenance pada formasi tutut layak untuk penelitian. tujuan dilakukannya penelitian ini ialah memberikan informasi geologi dan sumber batuan asal serta rekontruksi tektonik batupasir formasi tutut. metode penelitian yang digunakan pada penelitian ini yaitu analisis petrografi, yang kemudian dianalisis menggunakan klasifikasi batupasir pettijohn dan klasifikasi diagram qfl (quartz-feldspar-lithic) dari dickinson & suezek (1979). berdasarkan data yang diperoleh saat pemetaan dilapangan, daerah penelitian terdiri atas tiga formasi yaitu formasi tutut (qtt), formasi meulaboh (qpm), dan endapan alluvium (qh). formasi tutut (qtt) terbentuk pada kala pliosen hingga plistosen dengan litologi batulempung, batupasir, batulanau, dan konglomerat, serta sisipan tipis batubara. pada formasi meulaboh (qpm) didapati endapan lempung, endapan pasir, dan endapan lanau. pada satuan endapan alluvium (qh) hanya didapati endapan pasir. pengamatan bentang alam darah penelitian diperoleh 2 bentang alam yang terdiri dari satuan bentuk lahan d3 dan d6) dan satuan bentuk lahan fluvial (f1 dan f4). hasil interpretasi pola aliran daerah penelitian menunjukan pola aliran parallel dan dendritik. berdasarkan hasil analisis petrografi 5 sampel batupasir yang mewakili satuan batuan batupasir formasi tutut, termasuk dalam kategori lithic arenite hingga sub-lithicarenite. analisis studi batuan asal pada batupasir formasi tutut dihasilkan tatanan tektonik berada pada zona recycled orogenic sub zona quartzose recycled dengan model tatanan tektonik zona fold thrust belt. hasil akhir penelitian ini mencakup peta lintasan, peta geologi, peta geomorfologi, analisis petrografi, dan analisis provenance.

The study area covers approximately 4 × 6 km² and is located in Beutong District, Nagan Raya Regency, Aceh Province. Geographically, the study area lies between coordinates 96°25’16.08”–96°27’4.81” E and 4°16’0.74”–4°16’4.81” N. Geologically, the study area is situated within the lowlands to rolling hills physiographic zone. This zone developed as part of the regional tectonic evolution of Sumatra, controlled by subduction and uplift processes along the Bukit Barisan orogenic belt, which produced significant relief contrast between sediment source areas and depositional zones. The Beutong area occupies a relatively lower structural position and is characterized by weak to moderate tectonic deformation, allowing it to function as a recipient zone for detrital materials derived from higher-elevation regions. Such conditions facilitate the accumulation of secondary gold within fluvial deposits derived from prolonged weathering and erosion processes. This interpretation is supported by the presence of artisanal gold mining activities within the study area. Sandstones of the Tutut Formation act as an important medium for sediment transport and accumulation of secondary gold within these deposits. Therefore, provenance analysis is essential to determine the tectonic setting, source rock characteristics, and sedimentary processes that have influenced the development of the Tutut Formation sandstones. The dominance of sandstone lithologies and the limited availability of tectonic reconstruction data further justify the significance of conducting a provenance study on the Tutut Formation. The objectives of this study are to provide geological information regarding source rocks and to reconstruct the tectonic setting of the Tutut Formation sandstones. The research methodology involves petrographic analysis, which is subsequently interpreted using the sandstone classification of Pettijohn and the QFL (Quartz–Feldspar–Lithic) diagram of Dickinson and Suczek (1979). Field mapping results indicate that the study area consists of three geological units: the Tutut Formation (QTt), the Meulaboh Formation (Qpm), and Alluvial Deposits (Qh). The Tutut Formation (QTt), deposited during the Pliocene to Pleistocene, is composed of claystone, sandstone, siltstone, and conglomerate, with thin intercalations of coal. The Meulaboh Formation (Qpm) consists of clay, sand, and silt deposits, while the Alluvial Deposits (Qh) are dominated by sand. Geomorphological observations identify two major landform units, including denudational landforms (D3 and D6) and fluvial landforms (F1 and F3). Drainage pattern analysis reveals the development of parallel and dendritic drainage systems. Petrographic analysis of five representative sandstone samples from the Tutut Formation classifies the sandstones as lithic arenite to sub-lithic arenite. Provenance analysis indicates that the sandstones were deposited within a recycled orogenic tectonic setting, specifically the quartzose recycled subzone, corresponding to a fold-thrust belt tectonic model. The final outputs of this study include traverse maps, geological maps, geomorphological maps, petrographic analyses, and provenance interpretations.