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All Journal Jurnal Pendidikan IPA Indonesia Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
S. Bachri, S.
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Education Energy Engineering Environmental Science

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STRUCTURAL PATTERN AND STRESS SYSTEM EVOLUTION DURING NEOGENE - PLEISTOCENE TIMES IN THE CENTRAL PART OF THE NORTH ARM OF SULAWESI Bachri, S.
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 3 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The study area has been subjected to intense fracturing or brittle deformation resulting in five main trends of lineaments and faults, i.e. (1) the Group A (the Perantanaan Fault Group) with a mean of direction N95°E/ N275°E, (2) the Group B (the Gorontalo Fault Group) with a mean of direction N125°E/ N305°E, (3) the Group C (the Paleleh Fault Group) with a mean of direction 165°E /N335°E, (4) the Group D (the Randangan Fault Group) with a mean of direction N25°E/ N205°E and (5) the Group E (the Kuandang Fault Group) having a mean of trend of N55°E/ N235°E. The complexity of structural pattern in the study area has been interpreted to be due to stress system evolution during Neogene - Pleistocene. The changing stress system orientation has reactivated the preexisting faults of the five groups with different sense of movements from the older deformation.The nearly E-W trending lineaments of Group A or the Perantanaan Fault Group coincide with trend of the long axis of ridges and valleys or depression areas which are covered by volcanic rocks, lake deposits, and alluvium of Quaternary age. This group of structures was presumably developed as reverse or thrust faults during Late Neogene which later on to have beem reactivated as normal faults due to extensional tectonics of the North Sulawesi area during Plesitocene.The Gorontalo Fault, as a part of the Group B (the Gorontalo Fault Group), generally has been interpreted as dextral wrench fault. The present structural analysis suggests that this major fault was formerly developed as a dextral fault during Neogene, and later during Pleistocene it was reactivated in the sense of sinistral fault due to the changing of the stress system. The Neogene stress orientation is supposed to be related to the subduction of the North Sulawesi Sea to the south, which during Pleistocene weakened as the Sangihe Subduction in the Mollucas Sea to the east commenced resulting in the change of field stress orientation.Key words: Structural pattern, stress system, Neogene - Pleistocene, north arm of Sulawesi
BATUAN ASAL DAN ALAS FORMASI PALEOGEN CEKUNGAN SERAYU Bachri, S.
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 1 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The occurrence of volcanic fragments within the most rock samples of the Worawari Formation, as indicated by SEM and petrographic analysis, suggest that the mainsource rock or provenance of the Worawari Formation is a volcanic rock. The volcanic rock, supposed to be Paleogene in age, was deposited in a short time on land before reworked transported and deposited in the sea, or partly formed as pyroclastic fall which was directly deposited in the sea as indicated by the occurrence of sedimentary structures, mainly wavy and parallel lamination. Meanwhile, a part of the rock samples of the Worawari Formation contain slate fragments suggesting that parts of source rock are metamorphic rock and a quartz rich rock. The quartz rich rock is supposed to be granitic basement as indicated by gravity data. This basement rock is Late Cretaceous in age, as indicated by fission-track dating using By zircon content in the Worawari Formation. The age suggests that the basement rock is apart of the Southeast Asian Plate or Sunda Platform.Key words : provenance, basement rock, Serayu Basin, Paleogen formation
Improving Environmental Sensitivity through Problem-Based Hybrid Learning (PBHL): An Experimental Study Amin, S.; Sumarmi, S.; Bachri, S.; Susilo, S.; Mkumbachi, R. L.; Ghozi, A.
Jurnal Pendidikan IPA Indonesia Vol 11, No 3 (2022): September 2022
Publisher : Program Studi Pendidikan IPA Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpii.v11i3.38071

Abstract

Students need to possess sensitivity to the environment in order to behave positively when they notice a problem and find the right solution. This study intends to investigate whether the PBHL model affects the environmental sensitivity of Social Science Education students on environmental issues and conservation materials. The quasi-experimental design of the pretest-posttest controlled group was used in this study. Students of the Social Science Education Department, Universitas Islam Negeri Maulana Malik Ibrahim Malang, Indonesia, were selected as research subjects using a purposive sampling technique. The research subjects were determined to consist of class D as the experimental class (29 students) and class B as the control class (29 students). Questionnaires with a Likert scale of 1 (strongly disagree) – 4 (strongly agree) were used in taking student environmental sensitivity data on environmental issues and conservation materials, totaling 28 items with indicators: knowledge, attitudes, and skills. Subsequently, the data were tested for normality and homogeneity and analyzed using an independent sample t-test. The results showed that the PBHL model had a significant effect on the environmental sensitivity of Social Science Education students on environmental issues and conservation materials ((p (0.009) α (0.05)). The average results of the sensitivity of the experimental class environment (N-Gain = 13.29) were higher than the control class (N-Gain = 8.75). This goal can be achieved through the syntax in the PBHL model. The suggestion for further research is that it is necessary to develop further by combining the PBHL model and interactive mobile learning media as a means for students to investigate and actualize problem-solving.
Co-Authors Amin, S. Ghozi, A. Mkumbachi, R. L. S. Susilo, S. Sumarmi, S.