New rock mass classifications for limestone of the Woyla group and its empirical relationship in Aceh Province, Indonesia

Rusydy, Ibnu; Al-Huda, Nafisah

doi:10.1007/s13146-021-00677-x

Cited by 6 publications

(4 citation statements)

References 31 publications

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“…Results from this study show that the Tawar Formation was strongly deformed, as evidenced by the presence of multi-size and multi-episode fracture systems, fault systems, and fold (figure 4-5). The presence of these structural features within the Tawar Formation is similar to the structural features of the Woyla Group of Sumatra [5][6][7]Therefore, on this basis, we interpret that the development of the Tawar Formation may have been influenced by the same geological processes that affected the Woyla group.…”

Section: Resultssupporting

confidence: 63%

“…The phyllites and volcanoes in the Toweren Member may belong to the Woyla Group. Current study of the limestone member of the Woyla group by [5] , [6], and [7] showed that this Pre-Tertiary formation was strongly affected by tectonic activities, and this may also seem to be the case with the Tawar Formation, where tectonic activities strongly influence the evolution of the Tawar Formation. Moreover, the Tawar Formation is also considered a potential site of landslides around the Lut Tawar Formation, mainly due to its geological characteristics.…”

Section: Geological Settingmentioning

confidence: 99%

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Geological Evaluation of Structural Deformation of the Tawar Formation, Aceh Tengah, Indonesia

Gunawan,

Widiyani,

Tanzir

et al. 2024

IPR

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Lake Lut Tawar, which is situated in Aceh Tengah, has a unique geological landscape, with the presence of rock formations of the Pre-Tertiary age (Tawar Formation) and its geological connection with the Sumatran fault and the Bukit Barisan mountains. Even though the geological condition of the Lut Tawar Lake has attracted the attention of many geologists to carry out various kinds of research, there is still a lot of geological understanding that is not yet known, especially regarding the Tawar Formation. Tawar Formation is of Pre-Tertiary age and can be found around Lut Tawar Lake, Aceh Tengah. This research targeted the Tawar Formation with two main objectives: (1) to evaluate structural deformation and geologic structures developed within the Tawar Formation and (2) to understand better the main factors influencing the evolution of the Tawar Formation. Integrated geological analyses, including structural geology analysis, scanline method, and stereo net method, were used to achieve the objectives of this research. Results from this study show that the Tawar Formation has experienced a complex structural deformation, evidenced by the presence of various geological structures such as multi-size and multi-episode fracture systems and numerous folds and faults. Furthermore, we interpret the evolution of the Tawar Formation to be strongly influenced by tectonic activity, possibly related to the movement of the Sibumasu plate, the Sumatran fault system, and plate subduction in the southwest part of Sumatra. It is expected that the results of this research will provide a new understanding of the history and evolution of the Tawar Formation and a better understanding of the deformation of rock structures that occurred in the Lut Tawar area, Aceh Tengah.

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Section: Resultssupporting

confidence: 63%

Section: Geological Settingmentioning

confidence: 99%

Geological Evaluation of Structural Deformation of the Tawar Formation, Aceh Tengah, Indonesia

Gunawan,

Widiyani,

Tanzir

et al. 2024

IPR

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“…1). These Pre-Tertiary carbonate rocks were selected for this study due to the potential of these rocks as good quality reservoir, due to the presence of extensive fracture systems (Rusydy et al, 2019;Rusydy and Al-Huda, 2021), and also due to the report of the possibility of Pre-Tertiary hydrocarbon play in Sumatra (Bahesti et al, 2015;Bahesti, 2017). These limestone members of the Woyla group were found in many locations across northern Sumatra, however, characteristics of these sedimentary units and the main factors influencing their development are not well understood.…”

Section: Introductionmentioning

confidence: 99%

A geological overview of the limestone members of the Woyla Group of Sumatra, Indonesia

Adhari,

Hidayat

2023

J. Geoscience Eng. Environ. Technol.

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Mesozoic limestone units of the Woyla group were identified in many places across the northern part of Sumatra, Indonesia. Even though these sedimentary rocks may play an important role as an element of the potential Pre-Tertiary hydrocarbon play of Sumatra, their characteristics are still not well understood. This study tries to fill this research gap and aims to better understand the characteristics of the limestone members of the Woyla group. There are three objectives of this study: (1) to characterise structural features, and deformation of the Woyla Group; (2) to provide sedimentary characteristics of the limestone members of the Woyla Group; and (3) to understand the main influences on the development of the limestone members of the Woyla Group. An integrated geological analyses, including structural scanline analysis, petrographic analysis, and acid digestion analysis, was conducted to achieve the objectives of this study. Findings from this research show that the limestone members of the Woyla group were strongly deformed, and structural features such as bedded strata, faults, folds, and joints were identified within these rocks. The limestone units of the Woyla group consist of at least six microfacies. These are wackestone, packstone, wackestone-packstone, packstone-rudstone, fossiliferous sandstone, and fossiliferous shale. Depositional processes, sea level fluctuations, tectonisms, and climatic variations are interpreted as the main factors influencing the development and evolution of these limestone units. It is expected that the results of this study could advance our understanding of the Pre-Tertiary carbonate rocks in general, and the Woyla group of Sumatra in particular.

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“…The dip and dip direction of discontinuity planes (e.g. joints, bedding) on the rock slopes were recording directly employing geological compass by Rusydy et al [2,5,7,13]. The dip and dip direction discontinuity planes data were plotted in stereographic projection to determine the number of planes most likely having a similar direction with the slope face, and the dips of planes are higher than friction angle (Ф) but lower than slope angle.…”

Section: Methodsmentioning

confidence: 99%

Rock slope kinematic analysis for planar failure: A probabilistic approach

et al. 2022

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The probabilistic kinematic analysis for rock slope has been conducted on one slope along USAID road in Aceh Province, Indonesia. This research aims to develop the modelled probability density function (PDF) and determine the probabilistic of planar failure occurrence (Pop). The geometry of discontinuity planes (dip and dip directions) and slope geometry (slope angle and slope face) were collected from our previous study. One slope with planar failure criteria was selected. The Monte Carlo simulations were performed in generating 100 new random values in 100 time iterations to produce modelled PDFs for the geometry of discontinuity plans based on statistical parameters of field observed data. The probabilistic of each experimental PDFs were computed to produce the probabilistic of planar failure occurrence. The result reveals that the distribution of dip and dip directions for experimental PDFs are considered Beta and Normal distributions. The statistical parameters produced in the model are almost likely similar to observed data. It means the model that was developed are reliable and conscientious. The rule of Φ < βj < βs and dip directions (αj) within ±20° to slope face (αs) are utilised as the boundaries to calculate the probabilistic of planar failure occurrence (Pop) which revealing 0.26.

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New rock mass classifications for limestone of the Woyla group and its empirical relationship in Aceh Province, Indonesia

Cited by 6 publications

References 31 publications

Geological Evaluation of Structural Deformation of the Tawar Formation, Aceh Tengah, Indonesia

Geological Evaluation of Structural Deformation of the Tawar Formation, Aceh Tengah, Indonesia

A geological overview of the limestone members of the Woyla Group of Sumatra, Indonesia

Rock slope kinematic analysis for planar failure: A probabilistic approach

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