Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Herman Moechtar
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

Published : 11 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 11 Documents
Search

 1   2 
SEDIMENTOLOGI DAN AKUMULASI KASITERIT PADA ENDAPAN ALUVIUM SEPANJANG AIR INAS HINGGA LAUT LEPAS PANTAI TANJUNG KUBU (TOBOALI), BANGKA SELATAN Herman Moechtar; S. Hidayat
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 2 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i2.162

Abstract

Placer cassiterite deposits of Air Inas suggest that the deposits consist of mass flows of coarse grains (A1), mass flows of fine grains (A2), offshores (B.1), nearshores (B2), fluvial (B3), Recent deposits of nearshores (C1), and flood basin deposits (C2). The research was based on analizing sedimentology and stratigraphy of eleven boreholes available along North to South traverse. Depth of bore hole varied from 1.60 to 12.20 at elevation of + 25,00 to – 7,20 m of sea level. Based on a series of sedimentary environment correlation, alluvial deposits can be divided into three sedimentary intervals (A,B and C). Each interval is characterized by environmental changes controlled by transgression and regression as well as climatic changes. Referring to cassiterite genesis there are three phenomena namely chemical and physical weatherings, transgression effect and climate changesKeywords: placer deposits, sediment, stratigraphy
RESPON SISTEM FLUVIAL TERHADAP PERUBAHAN IKLIM PLISTOSEN AKHIR-HOLOSEN TERKAIT SIKLUS MILANKOVITCH (Studi kasus geologi Kuarter berdasarkan aspek sedimentologi dan stratigrafi di dataran rendah pantai Pekalongan, Jawa Tengah) Herman Moechtar; Herman Mulyana
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 5 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i5.175

Abstract

The study consist of sedimentology and stratigraphy analyses of fiveteen boreholes along the NW-SE and N-S, starting from near shorelines to the southern area. The depth of bore hole varies from 9.25 to 14.80 m. The Late Pliestocene-Holocene sediments in the studied area have been correlated, using ceoss section in 1:100 scales. The sediments consist of offshore, nearshore, beach, swamp, river channel, and floodplain deposits. The study is focused in the river channels. The changing vertically and laterally of river channel show the effects of climate and tectonic. During fluvial systems (IP II and IP III) depositional process, show climatic changes on Milankovitch cycles involving a stage episode from the middle of sub-humid (D2/ late warming) to the late sub-humid (B1/ early cooling). River channel shifting due to laterally base level change is influenced by tectonic.Keywords: River channel, climate, Late Pleistocene-Holocene
INTERAKSI FAKTOR KENDALI TEKTONIK, PERMUKAAN LAUT DAN PERUBAHAN KLIM DI DAERAH TELUK KLABAT, KABUPATEN BANGKA INDUK, BANGKA S. Hidayat; Herman Moechtar
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i1.191

Abstract

The study of the Quarternary deposits in Klabat gulf areas was based on the analyses of the sedimentology and stratigraphy of fifteen borehole information obtained along west to east. The penetration of the bore head varied from 3.50 to 16.80 m from + 21 m to - 4 m of sea-level. Whereas, the Quarternary sediments in the studied area can be divided into seven sedimentary environments, consisting of alluvial fan (FKa), swamp (FRw), floodbasin (FCb), deltaic (FDt), sand beach (FPp), nearshore (FLdp), and nearshore to offshore (FLdp to FLlp) deposits. Based on the lateral and vertical sedimentary environment correlations, the Quaternary stratigraphic succession can be divided into four sedimentary intervals (IP I to IV). Each interval is typically for topography and elevation changes which is controlled by changes of the sedimentary environment systems. The controlling main factor of the sedimentary environment system changes was regional and local tectonics. Changes in tectonic regime are important upon a tidal flat sedimentation. Keywords: facies, paleoenvironment, tectonic
PERUBAHAN LINGKUNGAN PENGENDAPAN HUBUNGANNYA DENGAN TEKTONIK KUARTER (Studi Kasus Geologi Kuarter di Wilayah Dataran Rendah Aluvial Hingga Pantai Sepanjang Maron- Sikucingkrajan, Kec. Gemuruh, Kab. Kendal (Jawa Tengah) Soemantri Poedjoprajitno; Herman Moechtar; S. Hidayat
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 2 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i2.198

Abstract

Quaternary deposits of the alluvial plain to coastal plains in the Kec. Gemuruh, Kabupaten Kendal in the north-coast of Java (The Central Java Province) have been studied. The study was based on an analyses of geological surface and subsurface, especially of six boreholes information obtained along the North-South, and the penetration of the bore head varied from 2.80 to 6,65 m. These Quaternary deposits, can be devided into Members of Sandstone Damar Formation (Tpds), Damar Formation (Qtd), floodbasin and river channel deposits. Based on the correlation of the lateral and vertical variations of the deposition environment in the eastern part, the sediment accumulations were recognised which are related to fault activities. Whereas, the sediment accumulations in the western part influenced by normal fault. The tectonic activities which controlled the deposition processes were recorded as two stages. These were, (1)the activity of uplift fault obtained along the West to East, (2)the activity of uplift with direction West to East in the northern part followed by activity of normal fault towards almost North-South. Relative sea-level changes affect coastal-plain environment, they are influenced by local tectonic and global of sea-level changes. The tectonic activity also would cause shallowing and steepening of the depositional slope. Keywords : Quaternary sediments, tectonic, structure geology, sediment accumulation
SEDIMENTOLOGI DAN STRATIGRAFI ALUVIUM BAWAH PERMUKAAN DI PESISIR CIREBON DAN SEKITARNYA Suyatman Hidayat; Herman Mulyana; Herman Moechtar; Subiyanto Subiyanto
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 4 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i4.210

Abstract

This study was based on sedimentological analyses of seven boreholes located along the NW to SE traverse, approximately parallel to coastal line of Cirebon. The penetration of the bore head varies from 8 to 13 m. Holocene subsurface of alluvial deposits can be divided into seven environment systems, consisting of Gintung Formation and deposits of offshore, nearshore, beach sand, swamp, channel river, and floodplain. Based on stratigraphic aspects, the succession of that sediments can be divided into three sedimentary intervals (IP I-III). Each interval is typically for environment changes which is controlled by changes of sea level, such as high sea level (IP I), sea level falling (IP II), and low sea level (IP III). The Quaternary dynamics related to environment changes and changes of basin fill were influenced by universal of climatic circulation, regional tectonic, and local of sea level changes. Keywords: Aluvium deposits, sea level, tectonic, climate
GEOLOGI ALUVIUM DAN KARAKTER ENDAPAN PANTAI/PEMATANG PANTAI DI LEMBAH KRUENG ACEH, ACEH BESAR (PROV. NAD) Herman Moechtar; Subiyanto Subiyanto; D. Sugianto
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 4 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i4.212

Abstract

The alluvium in the Krueng Aceh valley, suggests that it is deposited in floodbasin, fluvial system, transition, and linier clastic environments. The linier clastic enviroments consists of offshore (Fellp), nearshore (Fedp), beach/ beach-ridge (Fep/ Fepp), and marsh deposits. The research was carried out by surface geological mapping and analysed sedimentology and stratigraphy of ten boreholes trending west-east to southwest and west-east to south. Depths of the boreholes varies from 2.30 to 10 m at elevation of + 0.90 - + 10 m above sea level. Based on correlation of sedimentary environment in the linier clatic environment,sea level changes can be divided into three cycles that were controlled by active tectonic of the Seulimeum fault respectively. Keywords: sedimentology, stratigraphy, alluvium
KARAKTER WILAYAH GENANGAN LAKUSTRIN HOLOSEN BERDASARKAN ASPEK SEDIMENTOLOGI DAN STRATIGRAFI ENDAPAN RAWA DAN UNDAK SUNGAI (Studi Kasus Geologi Kuarter Daerah Air Molek dan Sekitarnya, Kab. Singingi dan Kab. Indragiri Hulu, Provinsi Riau) Suyatman Hidayat; C Basri; Subiyanto Subiyanto; Herman Mulyana; Herman Moechtar
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 5 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i5.215

Abstract

This study was based on analyses of sedimentology and stratigraphy of nine sediment samples obtained from shallow boreholes. The boring was done of A - B traverse, southwest – northeast direction around Indragiri river, south of Rengat. The study was focus on river channel and lauctrin deposits under the swamp sediments and river terraces as the resent of penetration of the bore head varies from 3.80 to 9.95 m . Based on the correlation of lateral and vertical variation, the stratigraphic succession can be grouped into two depositional interval i.e. depositional interval I & II. (IP.I & IP II). Vertical changes on the lithologic composition can be related to changes on humidity conditions. It is shown from the changes in the character of the facies between lower and upper lacustrine. Changes in basin centre between lower and upper lacustrine environment, as the result of basement movement caused by tectonic activity, impected to up and down movement of the basin floor. Keywords : Quaternary sediments, lacustrine, climate, tectonic
PERUBAHAN LINGKUNGAN DAN KARAKTER SISTEM PENGENDAPAN PLISTOSEN AKHIR HOLOSEN DI DATARAN PANTAI PEKALONGAN, JAWA TENGAH Herman Moechtar; Herman mulyana; Suyatman Hidayat
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 6 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i6.221

Abstract

The study of the environmental changes and character of the depositonal systems during Late Plistocene to Holocene on the Pekalongan coastalplain was based on analyses of the sedimentology and stratigraphy of fourteen boreholes. The penentration of the bore head varied from 7.70 to 15.80 m. Six depositional environments which occurred above the Damar Formation (QTd) are: linier clastic deposits (offshore, nearshore, and beach), fluvial deposits (river channel and floodplain), and swamp deposits. These deposits are separated by three depositional intervals (IP I-III). Based on the correlation of lateral and vertical stratigraphic successions, the environmental changes and character of the depostional systems are controled by sea level changes during the Late Pleistocene which were related by glacial and inter-glacial periods. Probably, after deposition of IP I, a local tectonichsve controled deplifting of the are. Keywords: Sedimentology, Stratigraphy, late Pleistocene - Holocene
FASIES DAN PERUBAHAN LINGKUNGAN PENGENDAPAN KUARTER DI DAERAH LABUHAN (BELAWAN), SUMATERA UTARA Herman Mulyana; Herman Moechtar
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 1 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i1.224

Abstract

The Quaternary deposits in the Labuhan, Belawan, North Sumatera, have been studied. These deposits have been correlated, using sections on 1:100 scale.  From the correlation of thirteen boring logs, the Quaternary sediments can be divided into facies: (a) marine, (b) beach, (c) marsh, (d) floodbasin, and (e) fluvial channels. Furthermore, the Quaternary sediment consists of 4 (four) depositional cycles namely interval A, B, C, and D.The stratigraphic succession of Quaternary and basin fill in the studied area were influenced by global events. Changes in climatological conditions between sub-humid to optimum into subhumid to dry are the effect from Milankovitch cycles; and sea-level fluctuations from high sea-level into maximum to low sea-level were correlated to global changes of sea-level. Keywords: sedimentary environment, climate, sea-level, global
PENGARUH TEKTONIK DAN IKLIM TERHADAP PERUBAHAN LINGKUNGAN ENDAPAN KUARTER DAERAH SUMPUR, SUMATERA BARAT Herman Mulyana; Ungkap M.Lumbanbatu; Herman Moechtar
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 6 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i6.260

Abstract

Based on the depositional environment, the Quaternary deposits in the study area can be divided into five groups, i.e : (a) fluvial-channel deposits, (b) floodplain deposits (c) lake deposits, (d) transition/ tidal deposits, and (e) swamp deposits. Furthermore, this Quaternary deposits represent 3 (three) depositional intervals, namely Depositional Interval I-III.The development of the Quaternary environment and changes of basin fill in the research area were influenced by tectonic and climatic changes. Changes in climatological conditions, from the humid-subhumid into dry, probably due to global climatic changes following the Milankovitch cycles. While the vertical and lateral changes of environment systems could be influenced by reactivation of Singkarak-Solok fault segment. Keywords: Quaternary, tectonic, climate, environment
Co-Authors C Basri D. Sugianto Herman Mulyana S. Hidayat Soemantri Poedjoprajitno Subiyanto Subiyanto Suyatman Hidayat Ungkap M.Lumbanbatu