Resistivity Survey of Weathered Basalt at Ban Khok Salung Area, Lopburi, Central Thailand
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Resistivity Survey of Weathered BasResistivity Survey of Weathered Basalt at Ban Khok Salung Area, Lopbualt at Ban Khok Salung Area, Lopbu
ri, Central Thailandri, Central Thailand
*A.Nochai wong *A.Nochai wong *F.S.Si nghar aj war apan *F.S.Si nghar aj war apan **W.Galong **W.Galong
* Chiang Mai University ** Department of Mineral Resources
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TYPE OF ROCKAGE
(million years)
Rhyolite 11-13
Basalt 18
Rhyolite 18-21
Pyroclastic rock and tuff 22
Porphyritic andesite, basaltic
andesite, quartz latite, and
quartz trachyte
22-24
Table 1. Geologic sequence of the Lam Narai Group
(Jungyusuk and Suriyachai, 1987).
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Data AquisitionData Aquisition
* * Resistivity Depth sounding Resistivity Depth sounding
* Schlumberger configuration * Schlumberger configuration
H HHH HHHHHHH HHHHHHHHH HHHHHHH * H HHH HHHHHHH HHHHHHHHH HHHHHHH *
1130to m. 1130to m.
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Resistivity Sounding Data
3-Layer Resistivity Model
7-Layer Resistivity Model
Resistivity Model Selection
Geologic Model
Data InterpretationData Interpretation
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Model Type Layer configuration
Three-LayerModel
1. Overburden2. Weathered basalt(including weathered pyroclastic rock)3. Fresh basalt
Seven-LayerModel
1. Overburden2. Weathered basalt3. Rhyolite (11-13 million years)4. Basalt5. Rhyolite (18-21 million years)6. Pyroclastic rock and tuff7. Porphyritic andesite, basaltic andesite,quartz latite, and quartz trachyte
Table 2. Model Layering
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ConclusionConclusion
Target : Weathered Basalt Target : Weathered Basalt
Zone.Zone.Result : Excellent in delineating the base of Result : Excellent in delineating the base of
weathered basalt zone and depth to weathered basalt zone and depth to
basement. basement.
Poor in differentiating between Poor in differentiating between
weathered basalt and weathered weathered basalt and weathered
pyroclastic rocks. pyroclastic rocks.
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