Author(s)

San Yee Khaing^1*, Yuichi Sugai², Myo Min Tun³, Sugeng Sapto Surjono⁴, Jarot Setyowiyoto⁴

¹Department of Geology, Kyaing Tong University, Kyaing Tong, Myanmar.
²Department of Earth Resource Engineering, Faculty of Engineering, Kyushu University, Fukuoka, Japan.
³Ministry of Education, Office No. 13, Nay Pyi Taw, Myanmar.
⁴Department of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta, Indonesia.

Granulometric analysis of Ngrayong sandstone samples from Rembang area of NE Java (Indonesia) has been carried out to examine the textural characteristics and elucidate depositional environment. The result data from the grain size analysis indicates that the Ngrayong sediments are classified as sand or muddy sands. They are very fine- to medium-grained (phi values: 1.67 to 3.35), moderately- to well-sorted (standard deviation: 0.19 to 0.57), strongly fine-skewed to strongly coarse-skewed (skewness values: 4.82 to −5.97), and very platykurtic to very leptokurtic (kurtosis values: 0.36 to 2.41). Sandstone samples show unimodal grain size distribution. The sediments are interpreted to be transported in all three modes-traction, saltation and suspension, however, suspension and rolling are the major processes during transportation. Discriminant functions indicate diversity in the depositional environment for the sandstones. However, shallow marine is regarded as the dominant depositional environment. The preponderance of fine-grained sediments and lack of coarse sands suggest low to moderate energy conditions during deposition of Ngrayong sediments.

Granulometric Analysis, Ngrayong Sandstone, Rembang, Textural Characteristics, Depositional Environment

Khaing, S. , Sugai, Y. , Tun, M. , Surjono, S. and Setyowiyoto, J. (2022) Textural Characteristics and Depositional Environment of Ngrayong Sandstone (Middle Miocene) from Rembang Area, Northeast Java, Indonesia. Open Journal of Geology, 12, 1102-1119. doi: 10.4236/ojg.2022.1212052.