<![CDATA[Formasi Pulau Balang dan Formasi Balikpapan yang merupakan bagian dari Cekungan Kutai dicirikan oleh keberadaan batupasir sebagai salah satu litologi dominan. Analisis komposisi butiran penyusunnya dapat memberikan informasi mengenai tatanan tektonik serta karakteristik batuan asal. Penelitian ini bertujuan untuk mengidentifikasi batuan asal serta memahami tatanan tektonik yang memengaruhi pembentukan batupasir di wilayah studi. Metode yang digunakan meliputi analisis petrografi guna menentukan asal batuan, kondisi iklim purba saat sedimentasi berlangsung, serta lingkungan tektonik daerah penelitian. Hasil penelitian menunjukkan bahwa wilayah studi berada dalam tatanan tektonik recycled orogenic dengan subzona berkisar antara transitional recycled hingga lithic recycled yang dipengaruhi oleh aktivitas subduksi dan kolisi yang membentuk sabuk lipatan Antiklinorium Samarinda. Rekonstruksi kondisi iklim purba saat pembentukan batupasir menunjukkan adanya variasi dari iklim basah hingga kering dengan batuan asal berupa batuan metamorf seperti gneis, sekis, dan sabak, serta granit yang mengalami metamorfisme tingkat rendah. Kata kunci: asal batuan, batupasir, iklim purba, tatanan tektonik Abstract The Pulau Balang Formation and Balikpapan Formation which are part of the Kutai Basin are characterized by the presence of sandstone as one of the dominant lithologies. Analyzing the composition of its constituent grains can provide insights into the tectonic setting and the characteristics of the source rocks. This study aims to identify the provenance of the sandstone and understand the tectonic framework that influenced its formation in the study area. The methods used include petrographic analysis to determine the origin of the rocks, the paleoclimatic conditions during sedimentation, and the tectonic environment of the region. The results indicate that the study area is part of a recycled orogenic tectonic setting, with subzones ranging from transitional recycled to lithic recycled, influenced by subduction and collision activities that formed the Samarinda Anticlinorium fold belt. The reconstruction of paleoclimatic conditions during sandstone formation suggests variations from humid to arid climates, with the source rocks consisting of metamorphic rock such as gneis, schist, and slate, as well as granite that underwent low grade metamorphism. Keywords: provenance, sandstone, paleoclimate, tectonic setting ]]>
