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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Soemantri Poedjoprajitno
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

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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
STUDI GEOMORFOLOGI UNTUK KELAYAKAN TEKNIS JALAN RUAS KANDANGAN- BAGANDAH KALIMANTAN SELATAN Soemantri Poedjoprajitno
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 5 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i5.252

Abstract

Kandangan-Bagandah road is the shorthest road alternative, which connects many town in South Kalimantan with the sea port of Batulicin, South Kalimantan.The road crossing a steep slope terrain and the very thick weathered soil has caused this road segment have the high susceptibility of mass movement.Geomorphological problems causing the road damage relate to the condition of landform such as: slope, degree of land density, peat or clay zone. Based on the physical aspect, the problems occurr as: mass movement soil creep, rock fall, development of valley (lateral erosion, backward erosion) and subsidence.Keywords: landform, lineament, sloping, mass movement, roadway
MORFOSTRATIGRAFI TUF IGNIMBRIT MANINJAU DI NGARAI SIANOK, DUSUN BELAKANG BALOK-BUKITTINGGI, SUMATERA BARAT Soemantri Poedjoprajitno
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 3 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i3.264

Abstract

The ignimbtrite plato of Sianok Valley at Belakang balok Village was produced by two periods of Maninjau volcanic eruptions. The two eruption periods are separated by fluvio volcanic deposits, consisting of very qoarse sand and conglomerate. The two periods pyroclatic deposits at containing pumice and locally several coal.  These pyroclatic deposits were faulted and formed terrace morphology. The Sianok Valley is considered as an effect of the reactivation of basement fault throughting the ignimbrite deposits. Keywords:morphostratigraphy , Maninjau pumice tuf, terrace, fault, plato
Co-Authors Herman Moechtar S. Hidayat