bluuebunny/crossref_metadata_2025_split huggingface dataset:
Penyebaran dan Karakteristik Zirkon Dasar Laut sebagai Endapan Sekunder di Perairan Singkawang dan sekitarnya, Kalimantan Barat
Authors: Aryanto Noor Cahyo , Kurnio H. 
Published: March 2024

DOI: 10.17014/ijog.v5i2.98The abundance of sea floor zircon mineral in the studied area was found at the southwest of Kabung Island (SKWL-56) which was accumulated in silty sand sediments at 23 m water depth. Based on the grain mineragraphy analysis, this mineral has various characteristics: rose, white, and brownish yellow colours, elongated prismatic crystals, and translucent to transparent appearances. The distribution profile lines have shown that the distribution of seafloor zircon tends to decrease from Kabung and its surrounding areas to Lemukutan, and from Kabung to the Land of Kalimantan. Considering the abundances, distribution, crystal shape, and mineral association, the zircon mineral in the studied area is a placer deposit that was produced by transport processes characterized by the changing form of crystal. Some samples observed, showed corrosion marks due to a transportation activity, while the transparent level change of these minerals was suggested to be due to much penetration into cavities in the mineral, which lead to the presence of gangue material during the deposition process.
Model Mineralisasi Pembentukan Opal Banten
Authors: Ansori Chusni 
Published: March 2024

DOI: 10.17014/ijog.v5i3.100Opal is a beautiful precious gemstone that is equal or more valuable than diamond. In Indonesia, precious opal is found at the Lebak Regency, Province of Banten. Banten’s opal widely has been recognized due to its beautiful opalescence. This paper is a review of the last research; preliminary study of Banten’s opal, characteristics of opal-CT and determining of opal type from geochemical data, added by new data to compile concept and to make mineralization model. In order to fulfill these targets, field geology research and analysis of mineralog/gemology, petrography, X-RD, and major and trace element geochemistry have been done. The Banten’s opal is opal-CT showing opalescence (play of colour), weathering, and leaching silica from volcanic glass by dark grey claystone hosted. Mineralization model is divided into three periods; at Early Pliocene volcanic clastic sediments rich in volcanic glass occured as fluvial sediments. Afterwards, at Late Pliocene - Pleistocene folding, weathering and leaching of silica took place. Intensive jointing, faulting, and folding quickened weathering and leaching processes to formed opal at limb of anticline through Holocene. The prospecting area of Banten’s opal is in tuff unit with intercalation of conglomerate or pumiceous breccia, at limb of anticline. The host rock of opal is dark grey claystone which underlies polimict conglomerate/pebbly sandstone sequence with cross stratification, imbricated, and erossional stucture; more than 8 m deep.
Makrozonasi dan Mikrozonasi Kerentanan Bencana Gempa Bumi di Wilayah Ende sebagai Data dasar Perencanaan dan Pengembangan Wilayah
Authors: Saputra Sukahar Eka , Suhaimi A. , Mulyasari F. 
Published: March 2024

DOI: 10.17014/ijog.v5i3.101The application of macrozonation and microzonation on earthquake hazard susceptibility for zoning regulation in the regency and city levels, is one of the activities of joint technical cooperation between the Geological Agency, Ministry of Energy and Mineral Resources and the German Federal Institute for Geosciences and Natural Resources (BGR) which involved the local government of Ende. Macrozonation of the Ende Regency contains a basic information of seismotectonics which consists of geological conditions (geomorphology, lithology, structural geology, and neotectonics) and seismicities (epicenter distribution, focal mechanism, earthquake source zones, and accelerations of hard, intermediate and soft rocks as well as their maximum intensity). On the other sides, it includes administrative boundaries and potential earthquake hazards as well as its collateral hazards when the earthquakes occurred. The research in the city area was a microzonation parameters of amplification, predominant period, and susceptibility index of earthquake hazard and its combinations. These important parameters can be used as spatial planning data for an earthquake risk assessment at each zone based on it own susceptibility degree.
Mekanisme Gempa Vulkanik Gunung Talang Pasca Gempa Tektonik Mentawai Tahun 2007-2009, Sumatra Barat
Authors: Kriswati Estu , Pamitro Y. E. , Basuki A. 
Published: March 2024

DOI: 10.17014/ijog.v5i3.104The Mentawai tectonic earthquake (magnitude 6.8 on the Richter Scale) on April 10, 2005 is assumed to trigger Talang volcanic activity that caused an eruption on April 12, 2005. Information on the source mechanism of volcanic earthquakes after the tectonic earthquake is expected to answer question of “Do tectonic earthquakes around the Talang Volcano trigger its volcanic activities?” Epicenter distribution of the volcanic earthquakes between 2007 and 2009 shows a southeast – northwest pattern with dextral strike-slip fault and normal fault mechanisms. The data show that earthquake activities at the Talang Volcano were dominated by local structure movements influenced by regional tectonic movements. Between 2007 and 2009, there were three process stages related to magnitude 6 or larger tectonic earthquakes around the Talang Volcano. First stage was a period before August 16, 2009. In this stage, volcanic fluids rose to the shallower chamber beneath the Talang Volcano. Second stage was a compressional stage and formation of a reverse fault influenced by Mentawai tectonic earthquake on August 16, 2009 and activation of a fault that intersects the Volcano. The third stage was a compresional stage and formation of a reverse fault influenced by Padang tectonic earthquake on September 30, 2009. In this stage, area fracturing was intensified, thereby the fracturing became more intensive. As the result, the accumulated volume and pressure of several tectonic earthquakes were released that caused an increase of eruption column soon after the tectonic earthquake.
Geochemical and Thermodinamic Modeling of Segara Anak Lake and the 2009 Eruption of Rinjani Volcano, Lombok, Indonesia
Authors: Solikhin Akhmad , Kunrat S. I. , Bernard A. , Barbier B. , Campion R. 
Published: March 2024

DOI: 10.17014/ijog.v5i4.106Rinjani is the second highest volcano in Indonesia with an elevation of 3726 m above sea level. The steep and highest cone of Rinjani consists mainly of loose pyroclastic ejecta and contains a crater with a few solfataras. The West of this cone is Segara Anak caldera. The western side of the caldera is occupied by a 230 m deep lake, covering an area of 11 km² and its volume was (before the 2009 eruption) estimated 1.02 km3. This is probably the largest hot volcanic lake in the world.The lake water is neutral (pH: 7-8) and its chemistry dominated by chlorides and sulfates with a relatively high TDS (Total Dissolved Solids: 2640 mg/l). This unusual TDS as well as the lake surface temperatures (20 - 22°C) well above ambient temperatures (14 - 15°C) for this altitude, reflect a strong input of hydrothermal fluids. Numerous hot springs are located along the shore at the foot of Barujari volcanic cone. Bathymetric profiles show also several areas with columns of gas bubbles escaping from the lake floor indicating a significant discharge of CO gas into the lake. The mass and energy balance model of Rinjani Crater Lake produce total heat lost value on the average of 1700 MW. Most of the heating periods of the lake occurred when the heat released by the surface of the lake to the atmosphere was lower than the heat supplied from the hydrothermal system. Peaks of heat losses correspond to period of strong winds. Crater lake monitoring can provide a basic information about deep magmatic activity and surface processes that occur in the volcano. The monitoring also contributes to predict the next eruption in order to improve mitigation of volcanic eruption. Precursory signals of the May 2009 eruption can be seen from significant changes in the temperature and chemistry of some of the hot springs, the increase of Fe concentrations in spring #54, chemical plume of low pH and dissolved oxygen, acidification of Segara Anak Lake, and increasing of lake surface temperatures. The new lava flow from May - August 2009 eruption covers an area of 650,000 m2. The shoreline was significantly modified by the entry of lava into Segara Anak Lake. The area of the lake is reduced by 460,000 m2.
Tectonostratigraphy and Structures of Eastern Seram
Authors: Bachri Syaiful 
Published: March 2024

DOI: 10.17014/ijog.v6i2.118The eastern Seram is part of the Outer Banda Arc consisting of para-autochthonous and allochthonous units which are unconformably overlain by the autochthonous units. The para-autochthonous units are derived from the outer margin of the Australian NW Shelf. This sequence comprises Permian metamorphic rocks of the Kobipoto Complex and its cover of Triassic - Jurassic to Cretaceous - Tertiary age. The allochthonous unit, or the pre-collisional Banda fore-arc sequence was overthrusted onto the NW Shelf sequence. The sediments overlying unconformably the allochthonous and para-autochthonous units are referred to as autochthonous units. These autochthonous units comprise sediments deposited post-Neogen collisional event between the Australian Continent and the Banda subduction zone. Structures develop in the eastern Seram are thrust, normal faults, folds, and cleavages. The thrusts are verging to the northeast suggesting that the deformation occurred before Seram was rotated in an E-W direction.
Organic Geochemistry and Rock-Eval Pyrolysis of Eocene fine Sediments, East Ketungau Basin, West Kalimantan
Authors: Zajuli M.H. Hermiyanto , Suyono Suyono 
Published: March 2024

DOI: 10.17014/ijog.v6i2.119Indonesia contains many Paleogene and Neogene basins which some of them have been proven to be a very prolific producer of oil and gas. A study on the result of Rock-Eval pyrolysis and biomarker undertaken on the Eocene Mandai Group was able to assess hydrocarbon potential of the Paleogene fine sediments in the frontier basin, especially West Kalimantan area. East Ketungau Basin is located in the western Kalimantan, bounded with Melawi Basin by the Semitau High in the south and West Ketungau Basin in the west. The Mandai Group was deposited in the East Ketungau Basin during Eocene, consisting of sandstone and mudstone facies. Mudstone facies comprises shale, claystone, and coal. Seven samples of Eocene fine sediments collected from East Ketungau Basin were analyzed by Rock-Eval pyrolisis and three samples for biomarker to evaluate their hydrocarbon potential. The Rock-Eval pyrolisis result of Mandai Group shows that TOC value of this facies ranges from 0.34 % to 5.16 %, Potential Yield (PY) between 0.06 and 4.78 mg HC/g rock, and Hydrogen Index (HI) from 12 to 89. Based on that result, the fine sediments of Mandai Group are included into a gas prone source rock potential with poor to fair categories. Moreover Tmax values vary from 426o C to 451o C. The Eocene fine sediments of Mandai Group fall under kerogen type III. Based on Tmax and biomarker analyses, the maturity of the sediments is situated within immature to mature level. The fine sediments of Mandai Group were deposited in a terrestrial to marine environment under anoxic to sub-oxic condition.
Sea Surface Temperature Reconstruction Period 1993 - 2007 Based on Content Analysis of Coral Sr/Ca from the Region Labuan Bajo, Simeulue Island
Authors: Cahyarini Sri Yudawati 
Published: March 2024

DOI: 10.17014/ijog.v6i3.121Sea surface temperature (SST) is one of the important parameters for (paleo) climate studies. The long time series of SST data are required to understand more the climate change. Coral geochemical proxy such as Sr/Ca overcomes this problem. Coral can provide long time series of climate data continuously from present till hundreds years ago, even fossil (dead) coral can do it till thousand years ago. In this study, Sr/Ca content of Porites coral within 10 m deep from Labuan Bajo, Simeulue Island was analyzed to reconstruct SST. Coral Sr/Ca shows a strong correlation with local SST in seasonal scale as well as in the annual mean scale. Reconstructed SST data show that the monsoon between 1993 2007 strongly influence the SST variation in the Simeulue region. It supposed that the seasonal variation signal strongly influence local SST than the annual mean signal such as El Nino.
Quaternary Geological Phenomena in Labuhan Area, Pandeglang Regency, Banten Province
Authors: Batu U. Lumban , Poedjoprajitno S. 
Published: March 2024

DOI: 10.17014/ijog.v7i4.148Geological features in Labuhan area were studied from the middle of October to the middle of November 2011 covering seventy days. Surface and subsurface data were obtained from interpretation of landsat images and shallow hand-auger boreholes. The geological features are distinctly associated with active tectonics. The stratigraphy clearly indicates at least three phases of tectonic activities since the Late Miocene until Holocene. Tectonics of phase one occurred in the Late Miocene; phase two took place in the period from Pliocene to Late Pleistocene, while tectonics phase three is ongoing in the Holocene. Volcanic activity has intensified since the Early Pleistocene. The landsat images show an irregular outline of the northern coast line. This penomenon is interpreted to be the result of tectonic uplift. On the other hand, the southern coast is linear in plan which is interpreted to correlate with tectonic subsidence. Furthermore, stratigraphic correlation shows that depositional environment changed vertically due to a local subsidence. The northern researched area is occupied by Pleistocene volcanic eruption centres, whilst the younger ones tend to shift southward. This fact tends to indicate that the subduction zone moved southward slowly.
The Potential of Ketungau and Silat Shales in Ketungau and Melawi Basins, West Kalimantan: For Oil Shale and Shale Gas Exploration
Authors: Santy Lauti Dwita , Panggabean Hermes 
Published: March 2024

DOI: 10.17014/ijog.v8i1.154The Ketungau and Melawi Basins, in West Kalimantan, are Tertiary intramontane basins of which the potential for economic conventional oil and gas discoveries have not previously been confirmed. The Ketungau Basin is bordered by the Melawi Basin in the south. Besides non-ideal trapping mechanisms, another major problem in these basins is source rock maturation. Nevertheless, both basins are promising to be explored for oil shale and shale gas energy resources. Therefore, the aim of this paper is to give some perspectives on their source rocks, as an input for the evaluation of the potential of unconventional oil and gas. About twenty samples collected from the Ketungau and Melawi Basins were analyzed using pyrolysis and organic petrographic methods. The results show a poor to good quality of source rock potential. The Ketungau shale, which is the main source rock in the Ketungau Basin, is dominated by type III, immature, and gas prone kerogen. The Silat shale, which is the main source rock in the Melawi Basin, is dominated by type II, immature to early mature, mixed gas, and oil prone kerogen. In the field, Ketungau and Silat Formations have a widespread distribution, and are typically 900 m to 1000 m thick. Both the Ketungau and Silat shales occur within synclinal structures, which have a poor trapping mechanism for conventional oil or gas targets, but are suitable for oil shale and shale gas exploration. This early stage of research clearly shows good potential for the future development of unconventional energy within the Ketungau and Melawi Basins.
Salinity Pattern in Semarang Coastal City: An Overview
Authors: Rahmawati Novi , Marfai M. A. 
Published: March 2024

DOI: 10.17014/ijog.v8i2.160Semarang Coastal City is one of cities in Indonesia which has experienced a long-term salt intrusion. Land subsidence and groundwater exploitation were identified as main factors accelerated salt intrusion in this area. Extended salt intrusion into the land from year to year cannot be neglected. Salinity pattern and land use affected by this intrusion must be identified. Salinity pattern could be identified by electrical conductance content. The purposes of this research are: a) to define spatial electrical conductance map from 1995 to 2008 and b) to identify salinity pattern in each land use. Primary data set of electrical conductance measurement in 2004 and 2008 was performed. Secondary data set of electrical conductance was collected in 1995 and 2000. Electrical conductance mapping was assigned by point interpolation using GIS Environment. Land use classification was interpreted from topographical map and IKONOS using GIS Environment. Field check of land use was also done in the study area. Geologically, the area setting consists of Damar, Kalibiuk, and Breccias Formations, where the Damar Formation is the recharge source for groundwater in Semarang City. Based on the result, it can be concluded that the salinity content in groundwater increased from 1995-2008. In 1995, there was only 2.4% of brackish groundwater in Semarang Coastal City, but in 2008, most of area in that region was classified as saline. Land use conversion into built up area increased from 1998 to 2008. The area intruded by salt water increased within 1995, 2004, and 2008 periods. About 68 % of the area contained brackish water and most of the area were built up area in 1995. In 2004, no fresh groundwater found in Semarang Coastal City and the area of brackish groundwater reached 77% and about 23% was saline groundwater which 82% of the built up area included brackish groundwater. In 2008, approximately 55% of Semarang Coastal City was occupied by saline groundwater. About 51% of groundwater built up area was saline.
Magma Supply System at Batur Volcano Inferred from Volcano-Tectonic Earthquakes and Their Focal Mechanism
Authors: Hidayati Sri , Sulaeman C. 
Published: March 2024

DOI: 10.17014/ijog.v8i2.159The Volcano-Tectonic (VT) earthquakes occurring during September - November 2009 were analyzed. The result shows that the epicentres aligning in NE- SW direction coincided with the weak zone of Batur Volcano Complex. The focal zone is located at the depth around 1.5 - 5.5 km beneath the summit. Migration of magma was detected by ground deformation measured by GPS and focal mechanism. Mechanism of VT earthquake shows mostly normal fault types during the swarm in November 2009.
Los Constructores Prodigiosos
Authors: Anson i Fradera Martí 
Published: March 2024

Imágenes que forman parte de un proyecto mas complejo que se mostró en "Els constructors prodigiosos" en la exposición realizada en el M|A|C Mataró Art Contemporani en 2023.
Imagenes de pedazos de lona cortados y regalados.
PENINGKATAN KEMAMPUAN KOMUNIKASI MATEMATIS MELALUI PEMBELAJARAN BERBANTUAN MACROMEDIA FLASH MX
Authors: Nasrulloh Anton , Dwiyanti Widya 
Published: March 2024

Kemampuan komunikasi matematis adalah kemampuan penting yang harus dimiliki oleh siswa. Pada pene-litian ini, pembelajaran berbantuan program Macromedia flash MX digunakan untuk meningkatkan kemam-puan komunikasi matematis siswa. Selain dalam hal penggunaan software, peran suatu perangkat pendukung tambahan dalam pembelajaran juga diselidiki. Subjek adalah 65 siswa Sekolah Menengah Kejuruan (SMK) yang terbagi menjadi 32 orang siswa pada kelas kontrol (pembelajaran Macromedia flash MX) dan 33 siswa pada kelas eksperimen (pembelajaran berbantuan program Macromedia flash MX yang disertai dengan pe-rangkat pendukung tambahan, MFMX+). Kemampuan komunikasi matematis di evaluasi melalui tes tertulis. Hasil menunjukkan bahwa terjadi peningkatan kemampuan komunikasi matematis baik di kelas kontrol mau-pun kelas eksperimen, meskipun dalam taraf yang berbeda. Siswa di kelas MFMX+ menunjukkan peningkatan kemampuan komunikasi matematis siswa yang lebih baik dibandingkan siswa kelas kontrol. Pembelajaran de-ngan Macromedia flash MX mampu meningkatkan kemampuan komunikasi matematis dan keberadaan pe-rangkat pendukung memaksimalkan manfaat yang dapat diperoleh dari penggunaan Macromedia flash MX.ABSTRACT Mathematical communication ability is an important ability that the students must possess. In this study, learn-ing assisted with Macromedia flash MX was used to increase students’ mathematical communication ability. Aside from the use of software, the role of supporting tools in learning was also investigated. Subjects were 65 Vocational Schools (SMK) students divided into 32 students in control class (learning assisted with Macro-media flash MX) and 33 students in the experimental class (learning assisted with Macromedia flash MX and additional supporting tools, MFMX+). Mathematical communication ability was evaluated through written test. Results showed an increase in mathematical communication ability both in the control and experimental class, albeit to a different degree. Students in MFMX+ class showed a higher mathematical communication ability improvement compared to students in control class. Learning assisted with Macromedia flash MX im-proved mathematical communication ability and supporting tools maximize benefits that can be gained from the use of Macromedia flash MX.How to cite: Nasrullah, A. Dwiyanti, W. (2016). Peningkatan Kemampuan Komunikasi Matematis Melalui Pembelajaran Berbantuan Macromedia Flash MX, Jurnal Pengajaran MIPA, 21(2), 129-134.
IMPROVING PRESERVICE BIOLOGY TEACHERS’ SPATIAL THINKING IN PLANT ANATOMY COURSE THROUGH FRAMING
Authors: Ermayanti Ermayanti , Rustaman Nuryani Y , Rahmat Adi 
Published: March 2024

In this study, we reported the implementation of framing in plant anatomy course and how framing improves preservice biology teachers' spatial thinking. Thirty-five preservice biology teachers served as subjects. Spatial thinking were evaluated based on four cognitive processes in spatial thinking: (1) producing representations, (2) maintaining and managing representations in working memory, (3) scanning the representation in working memory, and (4) transforming representations. Results indicated that framing improved preservice biology teachers’ spatial thinking in which all four spatial thinking parameters significantly improved after learning plant anatomy with framing. Framing in a plant anatomy course can improve preservice biology teachers’ spa-tial thinking because questions, guiding sentences, and worked examples aided them in overcoming cognitive stress when engaged in a difficult task.ABSTRAK Dalam studi ini, kami melaporkan implementasi framing dalam mata kuliah anatomi tumbuhan dan bagaimana framing dapat meningkatkan pemikiran spasial calon guru biologi. Tiga puluh lima calon guru biologi menjadi subjek penelitian ini. Keterampilan berpikir spasial dievaluasi berdasarkan empat proses kognitif dalam pemi-kiran spasial: (1) menghasilkan representasi, (2) mempertahankan dan mengelola representasi dalam working memory, (3) memindai representasi dalam working memory, dan (4) mentransformasikan representasi. Hasil penelitian menunjukkan bahwa framing meningkatkan pemikiran spasial calon guru biologi dengan keempat parameter berpikir spasial meningkat secara signifikan setelah pembelajaran anatomi tumbuhan dengan fra-ming. Framing dalam mata kuliah anatomi tumbuhan dapat meningkatkan pemikiran spasial calon guru bio-logi karena pertanyaan-pertanyaan, kalimat-kalimat panduan, serta worked examples membantu mereka dalam mengatasi stres kognitif saat terlibat dalam tugas yang sulit.How to cite: Ermayanti, Rustaman, N.Y., Rahmat, A. (2016). Improving Preservice Biology Teachers’ Spa-tial Thinking in Plant Anatomy Course through Framing. Jurnal Pengajaran MIPA, 21(2), 185-190.