Electronic Theses and Dissertation

Lokasi penelitian terletak di Kecamatan Blangkejeren dan Kecamatan Dabun Gelang, Kabupaten Gayo Lues, Provinsi Aceh. Secara Geografis lokasi penelitian ini terletak pada koordinat 4°0'3.08" - 4°2'13.31" LU dan 97°19'48.97" - 97°23'3.51" BT, dengan luas 24 km2. Kondisi geologi regional pada lokasi penelitian terdiri dari Formasi Rampong (Tlr) yang terdiri atas Batupasir dengan ukuran butir pasir halus - sedang, terpilah baik, kemas terbuka, kebundaran membundar - sangat membundar, kandungan mineral kuarsa. Konglomerat dengan ukuran butir pasir halus - berangkal, terpilah buruk, kemas terbuka. Serpih dengan ukuran butir lanau, terpilah baik, kemas tertutup, struktur sedimen berupa fissility, Batulanau dengan ukuran butir lanau, terpilah baik, kemas tertutup, kebundaran sangat membundar, kandungan mineral kuarsa. Sedimen vulkanik berupa Tuf dengan tekstur vitrik dengan kandungan gelas dan kristal. Formasi Kluet (Puk) yang terdiri dari Sabak yang memiliki struktur foliasi: slaty cleavage, tekstur nematoblastik, kandungan mineral kuarsa, muskovit, dan opak. Metalanau yang memiliki ukuran butir Lanau, terpilah baik, kemas tertutup, struktur berupa foliasi: slaty cleavage, bertekstur lepidoblastik, kandungan mineral muskovit. Arenit-metakuarsa yang memiliki struktur non foliasi: granulose, tekstur granuloblastik, kandungan mineral kuarsa, muskovit, dan opak. Endapan Alluvium (Qh) terdiri dari kerikil, pasir, dan lanau. Penelitian ini juga bertujuan untuk mengetahui bagaimana persebaran batuan, kondisi geomorfologi, dan kandungan mineral pada setiap litologi batuan dengan menggunakan metode petrografi. Hasil yang diperoleh dari penelitian ini 5 satuan geomorfologi yaitu Satuan geomorfologi dataran denudasional (D5), satuan topografi bergelombang kuat hingga perbukitan (S3), Satuan teras denudasional (S8), Satuan tubuh sungai (F1), Satuan dataran banjir dan Saluran sungai mati tanpa air (F3). Selain itu terdapat 6 satuan batuan penyusun yaitu Satuan Batulanau (Tlr), Satuan Batupasir (Tlr), Satuan Batuserpih (Tlr), Satuan Konglomerat (Tlr), Satuan Batu Metamorf (Puk), dan Satuan Endapan Alluvium (Qh). Struktur geologi yang berkembang pada lokasi penelitian berupa kekar gerus dengan arah orientasi kekar dominan menunjukkan arah utara – selatan (N-S).

Kata Kunci: Pemetaan Geologi, Formasi Rampong, Formasi Kluet, Petrografi Batuan Dabun Gelang, Petrografi.

The research site is located in Blangkejeren District and Dabun Gelang District, Gayo Lues Regency, Aceh Province. Geographically, the research location is located at coordinates 4°0'3.08” - 4°2'13.31” LU and 97°19'48.97” - 97°23'3.51” East, with an area of 24 km2. Regional geological conditions at the research site consist of the Rampong Formation (Tlr) which consists of sandstone with fine - medium sand grain size, well sorted, open packed, rounded - very rounded, quartz mineral content. Conglomerate with fine - shallow sand grain size, poorly sorted, open packed. Shale with silt grain size, well sorted, closed packed, fissility sedimentary structure, Siltstone with silt grain size, well sorted, closed packed, strongly rounded, quartz mineral content. Volcanic sediments in the form of Tuff with vitrified texture with glass and crystal content. Kluet Formation (Puk) consisting of Slate which has foliation structure: slaty cleavage, nematoblastic texture, mineral content of quartz, muscovite, and opaque. Metasilststone which has a grain size of silt, well sorted, closed packing, foliation structure: slaty cleavage, lepidoblastic texture, mineral content of muscovite. Arenite-quartz which has non-foliation structure: granulose, granuloblastic texture, mineral content of quartz, muscovite, and opaque. Alluvium deposits (Qh) consist of gravel, sand, and silt. This research also aims to find out how the distribution of rocks, geomorphological conditions, and mineral content in each rock lithology using petrographic methods. The results obtained from this study are 5 geomorphological units, namely the denudational plain geomorphology unit (D5), strong undulating to hilly topographic unit (S3), denudational terrace unit (S8), river body unit (F1), floodplain unit and dead river channel without water (F3). In addition, there are 6 constituent rock units, namely the Siltstone Unit (Tlr), Sandstone Unit (Tlr), Shale Unit (Tlr), Conglomerate Unit (Tlr), Metamorphic Rock Unit (Puk), and Alluvium Deposition Unit (Qh). The geological structure that develops at the research site is in the form of grinding bridle with the orientation direction of the dominant bridle showing north - south (N-S) direction. Keywords: Geological Mapping, Rampong Formation, Kluet Formation, Dabun Gelang Rock Petrography, Petrography