Heterogeneous Geological Control on Volcanic Aquifers at Mount Ciremai , West Java, Indonesia

Heterogeneous Geological Control on Volcanic Aquifers at Mount Ciremai, West Java, Indonesia

Authors:

Dasapta Erwin Irawan Prihadi Soemintadiredja

Diky Irawan Asep Saepuloh

Cut Novianti

EUROPEAN GEOSCIENCES UNION GENERAL ASSEMBLY

Vienna, 22-27 April 2012

Applied Geology Research Group, Faculty of Earth Sciences and Tech.Institut Teknologi BandungINDONESIA

Board of Regional Planning and Development, West Java Province,INDONESIA

Directorate of Higher Education, Ministry of Education, INDONESIA

University Partnership ProgramChevron Indonesia Company

HALL A #34324/04/12

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Introduction

• Strato volcano, at Kuningan and Majalengka Regency, West Java Province • Spring belt with no less than 160 springs; discharged over 8000 L/sec• The scientific interest is to identify various geological control to the groundwater

system

EGU|VIENNA|AUSTRIA|22-27 APRIL 2012

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Introduction

• Previous research results:– volcanic geology (Situmorang, 1995)– combination of porous and fractured aquifer systems (Puradimaja

et.al, 2003) – radial groundwater flow pattern of the volcanic deposits and recharge

area located above the 750 masl (Irawan et.al, 2002; 2008)– three hydrogeological systems (Irawan et.al, 2009) and spring EC

measurements (Irawan, 2011)


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Problems

UN-Known lithologyUN-Known structures

UN-Known hydrogeology ???

Large uncertainty, Need large number of data,

Maximum variation,Continuous time series measurement

SPRING ZONE

SPRING ZONE


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Methods

• Geological observations: lithology and structures

• Measurements at 160 spring locations (140 on east slope and 21 on west slope): T, EC, TDS, pH.


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Geological setting (1)EGU|VIENNA|AUSTRIA|22-27 APRIL 2012

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Geological setting (2)EGU|VIENNA|AUSTRIA|22-27 APRIL 2012

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Results (1): Elevation vs Q chart

• East slope: – 3 groundwater systems– 2 faults as boundary – Identified lithological

contact zone• West slope:

– 2 systems – interaction between

aquifers towards lower elevation

– possible fault boundary.

East slope

West slope

B1B2

B’

B’

B’’


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Results (2): Elevation-water temp. chart

• majority of hypothermal signal, on both slopes, indicating relatively deep groundwater flow.

• a boundary signals• The interpretation is also

confirmed with geophysical results and statistical analyses.

• Identified contact zone with sedimentary rocks.

East slope

West slope

B1

B2

B’

B’

B’’


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Results (4) TDS-Water temp. chart

• east slope: 3 groups – 1. meteoric groundwaters

homogeneous plot on east slope.

– 2. transition groundwaters– 3. geothermal/sedimentary

related groundwaters– Lithological contact zone

• west slope: similar zones with less mineralization system

East slope

West slope

B1 B2

B’B’’


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Conclusions (1)

• The methodology could be applied on volcanic deposit area with several notes:– need to get maximum number of variation for more

accurate interpretation.– Need other sub surface analysis, such as geophysical

mapping to get a better understanding on the hydrogeological frame work.

– Boundary may comes as faults, the most frequently observed, or other possible boundaries lithological contact and folds.

– It can be used to identify un-exposed geological conditions.


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Conclusions (2)

• Non-linearity occurs when the groundwater reaches the different lithology (sedimentary rocks) and or geothermal system.

• Anomalously large springs suggest that the aquifer boundaries are larger than the topographically watersheds.

• Possible faults as somehow leaking fault system.


Thank you

Applied Geology Research Group, Faculty of Earth Sciences and Tech.Institut Teknologi BandungINDONESIA

Board åof Regional Planning and Development, West Java Province,INDONESIA

Directorate of Higher Education, Ministry of Education, INDONESIA

University Partnership ProgramChevron Indonesia Company

The authors also would like to thank the following institutions:

[email protected]/derwinirawan

Visit West JavaThe volcano province of Indonesia


mailto:[email protected]

mailto:[email protected]

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ReferencesIrawan, D.E. and Puradimaja, D.J., 2002, Geological Mapping and Groundwater Characterization an Approach to Spring Recharge Area Conservation, International Conference on Urban Hydrology for the 21st Century, 14-18 October 2002, Kuala LumpurPuradimaja, D.J., Hendri Silaen, Irawan, D.E., 2003, New Hydrogeological Determination of Normal and Hot Spring Complex at Ciwaringin – G. Kromong – Pesawahan, North of Ciremai Volcano, West Java, Indonesia, International Conference on Mineral and Energy Resources Management 2003, 28 – 31 July 2003, Yogyakarta.Irawan, D.E., Puradimaja, D.J., Notosiswoyo, S., Soemintadiredja, P., 2008, Hydrogeological Model of Stratovolcano using Physical and Chemical Parameters of Groundwater at Mt. Ciremai’s Spring Zone, presented at International Symposium on Efficient Groundwater Resources Management Bangkok Thailand.Irawan, D.E., Puradimaja, D.J., Notosiswoyo, S., Soemintadiredja, P., 2009, Hydrogeochemistry of volcanic hydrogeology based on cluster analysis, of Mount Ciremai, West Java, Indonesia, Journal of Hydrology 376 (2009) 221–234, doi:10.1016/j.jhydrol.2009.07.033Irawan, D.E., Puradimaja, D.J., Notosiswoyo, S., Soemintadiredja, P., 2011, Characterization of Tropical Volcanic Hydrogeology based on Spring Discharge, Temperature and Electrical Conductivity Analysis: Mount Ciremai, West Java Province, Indonesia, EGU General Assembly• Sumintadireja, P., Saepuloh, A., Irawan, D., Irawan, D.E., and Fadillah, A., 2012, The Application

of Remote Sensing and Magneto-Telluric for Geothermal Exploration at Mount Ciremai, Kuningan Regency, West Java, Indonesia, ITB Journal of Sciences (in press)


Heterogeneous Geological Control on Volcanic Aquifers at Mount Ciremai , West Java, Indonesia

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