|
The previous research used geomagnetic method on 36 sample located in Mataram with radius 5x5kms2, have resulted isogram map that clearly indicated extreme magnetic dipole of 70.383,4nT(03535 '05, 34 " LS ll6`§07?22,8"BT at Karang Kemong) and -26_395,5m" (0ti*'37't5,2" LSl l 6° 05 'l L6 "BT at Asrama Haji, Jalan Lingkar Selatan). This value has been corrected with IGRF of45.000nT1 This paper will report the results of advance research to identify the sources of the extremegeomagnetic anomaly. The method used in this research is making a comparison between geomagneticanomaly value and gravity anomaly value (Bouguer anomaly); also the values of geomagnetic anomalyrecorded in several places that have been predicted or proven had mineral/ores potency Besides that, ageologic prediction will be made based on geo-electric survey at center of positive and negative anomaly.This research shows that there is correlation between low Bouguer anomaly (l40mGaU and positivegeomagnetic anomaly (70.3 83, 4nT), in the other hand high Bouguer anomaly (1 50mGaU correlated withpositive geomagnetic anomaly (-26.395,5nD. Besides that, the value of geomagnetic anomaly inMataram higher than those of other locations that have been predicted or proven had mineral/orespotency. Geo-electric method applied on bath maximum points of anomaly give a result that the mostprobable source of geomagnetic anomaly in Mataram is substructure that contains much fresh water(highly productive aquifer) or specific stricture of stone with magnetic property that must be studiedintensively. |
