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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
D.A Nainggolan
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

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STRUKTUR BAWAH PERMUKAAN DAERAH SEMARANG DAN SEKITARNYA DARI METODE GAYA BERAT DAN MAGNET D.A Nainggolan
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.v18i3.265

Abstract

The result of gravity measurements in the studied area, which is mainly covered by volcanic rocks, have an anomaly valueranging from-13 to 44 mgal. Geologic and tectonical development of the area may still be active until recently(?). For this reason, The Geological Survey Institute conducted detailed gravity study to delineate this possibility moreaccurately.  The hydrocarbon reserve had ever been exploitated by the Dutch Government from  the Cipluk field, southern of Kendal city and already been closed in 1930.From this fact, other areas In the northen part of this Quadrangle is potential for the hydrocarbon resource. The southern part of Ungaran Mountain may also potensial for the geothermal resource. The qualitative analysis of the anomaly patterns, subsurface profile  models including the geological structures reflects the geological processes, tectonics and Its  relationship with natural resources. The qualitative analysis on residual and Bouguer anomalies indicates that the structures in the study area have mainly east –west and north south directions.                                       Keywords: gravity, magnet, Bouguer anomaly,structures,Semarang
TINJAUAN ANALISIS GAYA BERAT TERHADAP BENTUKAN STRUKTUR BAWAH PERMUKAAN DI LEMBAR MEDAN, SUMATERA UTARA D.A Nainggolan
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 4 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i4.293

Abstract

Regionally, tectonics of the Medan Quadrangle is occupied by mountainous and back-arc basin zones. Mountainous zone occupies the southwestern of the quadrangles, and is situated in the northwestern part of Kabanjahe, having Bouguer anomaly ranges from -70 to 0 mgals. Zone of back-arc basin occupying more than 50% of the area extends to the east into the Malacca Strait, having Bouguer anomaly ranges from 0 until +20 mgals. The qualitative and quantitative of Bouguer and residual anomalies represent numerous shapes of anticlinal and synclinal structure including faulting system having direction of northwest - southeast. Keywords : mountainous, back-arc basin, Malacca Strait, subsurface structure, Bouguer anomaly
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