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Berita Sedimentologi [Pick the Date] Number 44 BERITA 10 / 2019 SEDIMENTOLOGI Published by The Indonesian Sedimentologists Forum (FOSI) The Sedimentology Commission - The Indonesian Association of Geologists (IAGI) Berita Sedimentologi [Pick the date] Editorial Board Advisory Board Minarwan Prof. Yahdi Zaim Chief Editor Quaternary Geology Bangkok, Thailand Institute of Technology, Bandung E-mail: [email protected] Prof. R. P. Koesoemadinata Herman Darman Deputy Chief Editor Emeritus Professor Director of Indogeo Social Enterprise Institute of Technology, Bandung Jakarta, Indonesia E-mail: [email protected] Wartono Rahardjo University of Gajah Mada, Yogyakarta, Indonesia Ricky Andrian Tampubolon Odira Energi Karang Agung E-mail: [email protected] Mohammad Syaiful Exploration Think Tank Indonesia Ragil Pratiwi Layout editor Patra Nusa Data, Jakarta F. Hasan Sidi E-mail: [email protected] Woodside, Perth, Australia Mohamad Amin Ahlun Nazar Prof. Dr. Harry Doust University Link Coordinator Faculty of Earth and Life Sciences, Vrije Jakarta, Indonesia Universiteit E-mail: [email protected] De Boelelaan 1085 Rina Rudd 1081 HV Amsterdam, The Netherlands Reviewer E-mails: [email protected]; Husky Energy, Jakarta, Indonesia [email protected] E-mail: [email protected] Dr. J.T. (Han) van Gorsel Visitasi Femant 6516 Minola St., HOUSTON, TX 77007, USA Treasurer, Membership & Social Media Coordinator www.vangorselslist.com Pertamina Hulu Energi, Jakarta, Indonesia E-mail: [email protected] E-mail: [email protected] Yan Bachtiar Muslih Dr. T.J.A. Reijers Pertamina University, Jakarta Geo-Training & Travel E-mail: [email protected] Gevelakkers 11, 9465TV Anderen, The Netherlands E-mail: [email protected] Maradona Mansyur Beicip Franlab, Kuala Lumpur Dr. Andy Wight E-mail: [email protected] formerly IIAPCO-Maxus-Repsol, latterly consultant for Mitra Energy Ltd, KL E-mail: [email protected] Cover Photograph: Cikanteh Waterfall in the Ciletuh-Palabuhanratu UNESCO Global Geopark, Sukabumi, West Java By: Ardiansyah et al. (2019) Berita Sedimentologi • Published 3 times a year by the Indonesian Sedimentologists Forum (Forum Sedimentologiwan Indonesia, FOSI), a commission of the Indonesian Association of Geologists (Ikatan Ahli Geologi Indonesia, IAGI). • Cover topics related to sedimentary geology, includes their depositional processes, deformation, minerals, basin fill, etc. Number 44 – October 2019 Page 2 of 43 Berita Sedimentologi [Pick the date] Berita Sedimentologi A sedimentological Journal of the Indonesia Sedimentologists Forum (FOSI), a commission of the Indonesian Association of Geologist (IAGI) From the Editor Dear Readers, geodiversity of Ciletuh- potential authors to contribute Palabuhanratu UNESCO for this volume. If you are We are really glad to deliver Global Geopark, which is interested to submit your another volume of Berita located in Sukabumi, West manuscripts to Berita Sedimentologi to your desk. Java. The last paper on p. 19 Sedimentologi No. 45 and This issue is Berita is written by Aldo Febriansyah beyond, please contact myself Sedimentologi No. 44, which and S. Husein who review or one of our editors. We was initially planned for roll- various orogenic belts in accept articles on any topics out in September, but finally Indonesia. This is a huge related to sedimentary published in October. article that provides an geology, structural geology, overview of Indonesia’s basin analysis, petroleum The content of Berita various thrust fold belts’ geology and even general Sedimentologi No. 44 is quite development based on recently geology. If you have doubt diverse despite its number of published papers by many about how you can contribute articles is only three. On p. 5, researchers. We hope they will to Berita Sedimentologi, you will find a field work be useful to our readers. please do not hesitate to email paper contributed by Ricky us. Tampubolon and Yan Rizal on The next volume of Berita sedimentary facies of the Sedimentologi is planned for upper part of Tapak publication in December Formation, Banyumas area, 2019. At the moment, we are Best regards, Central Java. On p. 11, already reviewing some Minarwan Nugraha Ardiansyah et al. manuscripts, nevertheless we Chief Editor provide a summary on the are still seeking for more Contents SEDIMENTARY FACIES OF THE UPPER PART OF TAPAK FORMATION IN BANYUMAS AREA, CENTRAL JAVA Ricky Adrian Tampubolon, Yan Rizal Page 5 GEODIVERSITY OF CILETUH-PALABUHANRATU UNESCO GLOBAL GEOPARK, SUKABUMI, WEST JAVA Nugraha Ardiansyah, Katon Sena Aji Nugraha, Rinaldi Ikhram Page 11 REGIONAL OVERVIEW OF OROGENIC BELTS IN INDONESIA: EMPHASIS ON THE OCCURRENCES OF THRUST WEDGE SYSTEMS Aldo Febriansyah Putra, Salahuddin Husein Page 19 BERITA Berita Sedimentologi #45 call for paper to: [email protected] SEDIMENTOLOGI Number 44 – October 2019 Page 3 of 43 Berita Sedimentologi [Pick the date] About FOSI he forum was founded in FOSI has close international team. IAGI office in Jakarta will T 1995 as the Indonesian relations with the Society of help if necessary. Sedimentologists Forum Sedimentary Geology (SEPM) and (FOSI). This organization is a the International Association of communication and discussion Sedimentologists (IAS). forum for geologists, especially for Fellowship is open to those those dealing with sedimentology holding a recognized degree in and sedimentary geology in geology or a cognate subject and Indonesia. non-graduates who have at least two years relevant experience. The forum was accepted as the sedimentological commission of FOSI has organized three the Indonesian Association of international conferences in 1999, The official website of FOSI is: Geologists (IAGI) in 1996. About 2001 and the most recently in 300 members were registered in 2018. 1999, including industrial and http://www.iagi.or.id/fosi/ academic fellows, as well as Most of FOSI administrative work students. will be handled by the editorial FOSI Membership Any person who has a background in geoscience and/or is engaged in the practising or teaching of geoscience or its related business may apply for general membership. As the organization has just been restarted, we use LinkedIn (www.linkedin.com) as the main data base platform. We realize that it is not the ideal solution, and we may look for other alternative in the near future. Having said that, for the current situation, LinkedIn is fit for purpose. International members and students are welcome to join the organization. FOSI Group Member as of October 2019: 986 members Number 44 – October 2019 Page 4 of 43 Berita Sedimentologi [Pick the date] SEDIMENTARY FACIES OF THE UPPER PART OF TAPAK FORMATION IN BANYUMAS AREA, CENTRAL JAVA Ricky Andrian Tampubolon1 and Yan Rizal2 1Odira Energi Karang Agung PSC, 2Institut Teknologi Bandung ABSTRACT The upper part of Tapak Formation in Kali Cimande of Banyumas area shows a good example of tidal flat succession. The interval consists of alternating sandstones, siltstone and mudstone that show a fining and thinning upward bedding pattern and includes sand flat, mixed flat and mud flat sedimentary facies. The sand flat facies is characterized by medium-grained sandstone, moderately sorted, with cross-lamination sedimentary structures and bioturbation trace fossils (Skolithos) found mostly on the top of sandstone layer. The mixed flat facies is characterized by an alternation of thin layered sandstones with mudstone and siltstone, with lenticular, wavy, and flaser sedimentary structures. This facies contains many forms of bioturbations, such as Planolites, Thallasinoides, Lockeia, and Ophiomorpha. The mud flat facies is characterized by repeated claystone and thin sandstone intercalation, where the ratio of clay content being more than 95 % of the total layers, and contains abundant Lockeia trace fossil. The Upper Tapak Formation in Banyumas basin has moderate reservoir potential. Keywords: Tapak Formation, Tidal Flat, Banyumas INTRODUCTION Kastowo and Suwarna (1996) subdivided the Kali Cimande (Cimande River) is located in the stratigraphy of South Serayu Mountain into seven synclinal part of Banyumas Basin (Figure 1). The formations. Tapak Formation was deposited in the outcrop along Kali Cimande shows good example of Early Pliocene and was subdivided into two tidal flat succession that was deposited during a members, namely Lower Tapak and Upper Tapak Pliocene regressive event, where the depositional Members (Djuri et al., 1996). environment changed from deep water during Middle The Lower Tapak Member is characterized by Miocene to shallow water following the inversion interbedded coarse sandstone and marl, greenish (uplift) event in the Middle Miocene to Plio- sand, conglomerate and breccia in many spots. The Pleistocene. Upper Tapak Member contains calcareous sandstone, limestone, and marl with mollusk The study area is covered by Majenang Geological fragments. Locally, reefal limestones can also be sheet of GRDC, mapped by Kastowo and Suwarna found (Marks, 1957). The thickness of the Tapak (1996). This area is showing a complicated structure formation is about 500 m and it was deposited in as deformation was very intense in this area (Figure shallow marine environments (Kertanegara et al., 2). Some alteration and gold mineralization were 1987). found along with this structure in the area. Several hydrocarbon seepages were found along the DATA AND METHODS NW–SE-oriented Cipari anticline. Mulhadiyono (2006) reported that one of the potential reservoirs This study is basically based on a field-work
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