An ENE‐WSW‐trending localized basalt‐diabase outcrop along the SE margin of Luk Ulo Mélange Complex has been suggested as intrusive rocks cut through the Paleogene Totogan and Karangsambung formations. However, the absolute dating of the volcanics is older than the inferred relative age of the sedimentary formations, hence the in‐situ intrusion theory is less likely. A subsurface imaging should delineate the possibility of the in‐situ nature of volcanic rock by looking at the continuation of the rocks to the depth. In this study, we did a subsurface imaging by electrical resistivity method. The electrical resistivity surveys were conducted at 3 (three) lines across the ENE‐WSW trend of the volcanic distribution. From those three measurements, we obtained three inversion models that present the distribution of the resistivity. We could differentiate between the high resistivity of volcanic rocks and the low resistivity of the clay‐dominated sediments. Instead of the deep‐rooted intrusions, the geometry of the volcanic rocks is concordant with the sedimentary strata. Since we do not observe any spatial continuity of the bodies, both laterally and vertically, the volcanic rocks might be part of broken intrusive rocks. Furthermore, the size and the sporadically distributed of the rocks also indicated that they are more likely as fragments during the olistostrome deposition, transported from its original location.

中文翻译：

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基于电阻率成像确定Karangsambung混杂岩群中火山岩的成因

由于侵入岩切穿了古近系Totogan和Karangsambung地层，有人建议在Luk UloMélangeComplex SE边缘沿ENE-WSW趋势局部玄武岩-辉绿岩露头。但是，火山的绝对年代要早于推断的沉积岩层的相对年龄，因此原位侵入理论不太可能。地下成像应通过观察岩石到深度的连续性来描述火山岩原位性质的可能性。在这项研究中，我们通过电阻率法进行了地下成像。沿火山分布ENE-WSW趋势的3条（三条）线进行了电阻率调查。从这三个测量值中，我们获得了三个反演模型，它们表示了电阻率的分布。我们可以区分火山岩的高电阻率和粘土为主的沉积物的低电阻率。火山岩的几何形状与沉积岩层一致，而不是根深蒂固的侵入体。由于我们在横向和垂直方向都没有观察到物体的任何空间连续性，因此火山岩可能是破碎侵入岩的一部分。此外，岩石的大小和零星分布还表明，在骨膜成骨膜沉积期间，从岩石的原始位置运走的可能性更大。由于我们在横向和垂直方向都没有观察到物体的任何空间连续性，因此火山岩可能是破碎侵入岩的一部分。此外，岩石的大小和零星分布还表明，在骨膜成骨膜沉积期间，从岩石的原始位置运走的可能性更大。由于我们没有在横向和垂直方向观察到物体的任何空间连续性，因此火山岩可能是破碎侵入岩的一部分。此外，岩石的大小和零星分布还表明，在骨膜成骨膜沉积期间，从岩石的原始位置运走的可能性更大。