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The Characteristic of Coastal Subsurface Quartenary

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The Characteristic of Coastal Subsurface Quartenary Bulletin of the Marine Geology, Vol. 28, No. 2, December 2013, pp. 83 to 93 The Characteristic of Coastal Subsurface Quartenary Sediment Based on Ground Probing Radar (GPR) Interpretation and Core Drilling Result of Anyer Coast, Banten Province Karakteristik Sedimen Pantai Kuarter Bawah Permukaan Berdasarkan Penafsiran “Ground Probing Radar” (GPR) dan Hasil Pemboran Inti, Pantai Anyer, Provinsi Banten Kris Budiono Marine Geological Institute, Jl. Dr. Junjunan No.236 Bandung Email : [email protected] (Received 02 August 2013; in revised form 20 November 2013; accepted 10 December 2013) ABSTRACT: The study of characteristic of subsurfase Quatenary sediment of Anyer coast have been done by using the data of Ground Probing Radar (GPR) image, Surfacial Geological map around the coast and the result of core drilling. The GPR equipment which was used are GSSI SIR 20 system and GSSI Sub Echo 40 MHz antennas. The GPR data image have been processed by using Radan GSSI software, Window NTIM version. The processing including Stacking, Spatial Filter, Migration and Decompolution. The interpretation of GPR image was done by using the principle of GPR stratigraphy through recoqnize to the internal and external reflector such as reflector configuration, continoutas, reflection, amplitude, etc, Furthermore the interpretation result of GPR image are correlated with the surfacial geological map and core drilling result that have been done by previous researscher. Besed on that correlation result, the characteristic of subsurface Quatenary deposits of study area can be divided into 5 unit mainly unit A, B, C, D and E. Unit A is the uppermost layer which is charactized by clay layer and coral reff fragments. Below the unit A they are unit B, C, and D wich were characterized by intercalation between sand and clay, sand deposit or sandstone, loose to dense. This condition is shown by the SPT (Standard Penetration Test) which have range between 10 to 50 blows per 15 Cm. Based on the characteristic of GPR image and sediment deposits of core drilling, these sediment deposits are interpreted as coastal and shallow water sediment deposits. Unit E is the lowermost layer which is interpreted as volcanic deposit. Key Word : subsurface quatenary sediment, ground propbing radar, core drilling, Anyer coast. ABSTRAK: Penelitian karakteristik sedimen bawah permukaan Kuarter di kawasan pantai Anyer telah dilakukan dengan mempergunakan data citra “ Ground Probing Radar”, geologi permukaan di sekitar kawasan pantai dan data hasil pemboran inti. Peralatan GPR yang dipergunakan adalah sistim SIR 20 GSSI dan antenna MLF 3200 GSSI.Data citra GPR telah diproses dengan mempergunakan perangkat lunak RADAN GSSI versi window NTIM. Pemrosesan terdiri dari “Stacking”, “Spatial Filter”, “Migration” dan “Decompolution”. Penafsiran Citra GPR dilakukan dengan mempergunakan prinsip Stratigrafi GPR melalui pengamatan terhadap internal dan eksternal reflector seperti konfigurasi reflector, kontinuitas, refleksi, amplitude dan lain-lain. Selanjutnya hasil penefsiran citra GPR ini dikorelasikan dengan peta geologi permukaan dan hasil pemboran inti yang telah dilakukan oleh peneliti terdahulu. Berdasarkan hasil korelasi tersebut karakteristik endapan Kuarter bawah permukaan daerah penelitian dapat dibagi menjadi 5 unit yaitu Unit A, B, C, D dan E. Unit A merupakan unit paling atas yang dicirikan lapisan lempung dan kerakal kerikil hasil rombakan koral. Unit B, C dan D berada di bawah ubit A yang merupakan endapan selang seling pasir dan lempung serta endapan pasir atau batu pasir bersifat urai sampai padat. Kondisi ini ditunjukan oleh hasil pengujian SPT(“Standard Penetration Test”) yang berkisar antara 10 sampai lebih dari 50 tumbukan per 15 Cm.Berdasarkan karakteristik fasies citra GPR dan endapan sedimen dari hasil pemboran inti, endapan sedimen tersebut ditafsirkan sebagai endapan pantai dan endapan laut dangkal Unit E merupakan lapisan paling bawah yang ditafsirkan sebagai endapan gunung api. Kata kunci :Sedimen Kuarter bawah permukaan,”Ground Probing Radar”, pemboran inti, pantai Anyer 83 INTRODUCTION subsurface Quartenary deposits from coast of Anyer The analysis of Ground Probing Radar (GPR) both horizontally and vertically. stratigraphic provides the framework for assessing both Administrativelly the study area is located at lateral and vertical geometries and the stratification of Anyer coast, Anyer Distric, Banten Province and o o coastal deposits (Beres and Haeni,1991; Jol and Smith, geographically between 105.90 – 106.05 longitude, – 1991; Gawthorpe et al., 1993; Huggenberger, 1993). and -5.95 -6.10 Latitude (Figure 1). The analysis is based on well-developed principles In general the geological condition around the of seismic stratigraphy and provides a systematic GPR survey area is based on to the geological map of methodology to objectively describe and interpret GPR Anyer Quadrangle which have been made by Santosa et reflection profiles for geologic applications. The all 1982. From the old to the younger rock units which development of radar stratigraphic analysis has allowed are found in the area of Anyer, consists : Marikangen for the delineation and mapping of genetically related volcanic rock, Produc of Gede volcano, Banten tuf, stratigraphic units within sedimentary deposits (van Gede volcanic rock, Pinang Mt Basalt and alluvium Heteren et al., 1998). In addition to stratigraphic deposits (Figure 2) applications, recent studies demonstrate the use of Concerning to the location of GPR survey area, the reflection geometry as a sea level indicator (e.g., upper rock unit that will influent the result of GPR survey are contacts between oblique beach/shoreface and dune Banten tuf and alluvium deposits. reflections; van Heteren and van de Plassche, 1997; van Banten tuff is divided into lower Banten tuff and Heteren et al., 1998. upper Banten tuff. Lower Banten tuff consist of tuff The main purpose of the study is to collect and to breccias, agglomerate, pumiceous tuff, lapilli tuf and analysis of the GPR image performed in shallow sandy tuff. 105.90o 106.05 o -5.95o -5.95 Sunda Strait o 106,05 -6.10 o 105.90Prov. o -6.10 Lampung N Core drilling Location GPR Survey 0 4 8 Location Prov. Kilometers Banten Figure 1. The study area location 84 Kris Budiono O 105.928O 106.08 O -5.928O -5.928 N LEGEND Alluvium Sunda strait Pinang Mt. Basalt Gede Volcanic Rock Banten tuff Produc of Gede Volcano Marikangan Vol.Rock -6.069O -6.069O O 105.928 O 106.08 Figure 2. The geological map of Anyer Quadrangle ( modified from Santosa et all, 1982) Tuff breccias, of intermediate tos basic Sandy tuff, clasts size range in coarse to medium, composition, the clats make up of sand to bomb size, acid to intermediate in composition; contain minor of subangular to subrounded; composed of basalt, light mica, biotite, mafic minerals and glass; and as andesite, pumice, obsidian with very fine pyroclastic intercalation or alternation in the other tuffs. The groundmass, thickness is several meters. The bomb thickness is more or less than 10 Cm. clasts are scattered and at limited numbers ( Santosa et The Lower Banten Tuff was deposited on a all, 1982). terrestrial environment, and the age was estimated at Agglomerate, clast make up of lapilli to bomb size, Early Pleistocene to Midle Pleistocene (Alzwar and well rounded to subrounded; composes of basalt, Akbar, 1975). andesite, pumice with sandy or fine clastic tuff matrix; Alluvium deposits are consists of coastal and river as small intercalations in the volcanic breccias, the deposits : pebble, gravel, sand, clay, mud and pumice thickness is about several meters. The exposes are pebbles (Santosa et all, 1982). found at the upper course of the Anyer River and on the Coastal deposit, locally mixes with shell and the northeastern escarpment of Danau Caldera (Santosa molusc fragments; and occupies along the west coastal et all, 1982) plain. River deposit commonly occupies along the Pumiceous tuff, dirty white to gray, clasts make up lower course area of the river : Cilemer, Ciliman gravel to sand size, sub rounded; composes of Labuhan and Anyer ( Santosa et all, 1982). dominantly pumice, basalt, andesite and obsidian; loose Pumice, gray to dirty white ; light, vesicular; and and weathered; the thickness of the layer is about between 5 to 30 cm in grained size, subrounded; rough several centimeters. surface. Locally, the distribution is as small Lapilli tuff, clast size range in less than 1 mm to accumulation along the west coastal plain (Santosa et gravel; acid to basic composition; composes of basalts, all, 1982). andesite, dacito-andesite and pumice; and the thickness The core drilling (Figure 3) was excecuted by is about several meters (Santosa et all, 1982) Marine Geological Institute in 2004 (Mustafa, 2004). The Characteristic of Coastal Subsurface Quartenary Sediment Based on Ground Probing Radar (GPR) Interpretation and Core Drilling Result of Anyer Coast 85 Project : MGI Location : Anyer Coast Start of drilling : 26-8-2004 No of Bor : BT 2 End of drilling : 27-8-2004 Depth : 20 m Method of drilling : Coring Type of machine : Koken S S % D S DESCRIPTION STANDARD PENETRATION C A R E Y A M E P M D N/ GRAPHIC N/Cm L P C T B P B E H O T L l L H W Mudandclayblackish gray soft Cl Unit Intercalationbetween A sandandcoral fragment,whitish gray,unconsolidated, fi t i d Sand with clay lamination, greyih Unit green, fine to medium B grained, consists of shell remains, dense to consolidated,SC Sand, grayish green, finetomediumgrained, well consolidated and very dense ( Sand stone?) Unit C Sand,grayishblack,fine tocoarsegrained, unconsolidated,loose, consistsofclay,SC Intercalationbetween sandstoneand claystone,grayishblack coulered,Sandstone Unit verydenseand D claystonehard Figure 3. Core drilling result (Modifid from Akrom, 2004) 86 Kris Budiono The results of core description can be summarized as follow: Form 0.00 to 1.00 meters is characterized by mud or clay, blackish gray, very soft, low plasticity. Below mud until 4.00 meter depth, is intercalation between sand and coral fragment, whitish gray,unconsolidated, fine to coarse grained.
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