Hydrostructure of Groundwater Manifestation of Gedongsongo Geothermal Ungaran, Semarang, Central Java, Indonesia

Arhananta Arhananta,Nazwa Khoiratun Hisan,Ludovikus Damardika Jasaputra,Nur Alif Yusuf Putra Karlina,Pius Artdanno Bernaldo

doi:10.31284/j.jemt.2020.v1i1.1150

Arhananta Arhananta, Nazwa Khoiratun Hisan + Show 3 more

Open Access

https://doi.org/10.31284/j.jemt.2020.v1i1.1150

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Abstract

Groundwater is an important element of the hydrological cycle in geothermal systems. The geological structure of the Plio-Pleistocene volcano and different lithological variations affect the type and response of groundwater to rocks. The research area is located around the Gedongsongo Temple complex, Mount Ungaran, Central Java. Based on the field check location, there are three variations of lithology, the first lithology is a breccia with andesite, basalt, and pyroclastic fragments. The NW-SE-oriented geological structure is flattened to the right slip fault which is the fracture aquifer system on the Southern Slope of Mount Ungaran. In the research area, there is an anomaly in the form of deflection of flow direction pattern caused by structural control factor in the form of fracture, the fracture which becomes the fluid channel media is a tension joint on the shear zone with Northwest strike with dip direction toward Northeast which has NW-SE orientation of right slip fault.

Highlights

Regional Geology Volcano activity is activated by the convergent movement of the Eurasian plate versa Hindi-Australian plate [3], Based on the map of the Ungaran sheet[4], the stratigraphy of the research area consists of two units, the Youngest and Youngest Ungaran Volcanic Output unit
Geology of Research Area Based on the field check location, there are three variations of lithology, the first lithology is a breccia with andesite, basalt, and pyroclastic fragments, the second lithology is conglomerate with andesite, basalt, and pyroclastic fragments, and the last is andesite lava
There is an anomaly in the form of deflection of flow direction pattern caused by structural control factor in the form of fracture, the fracture which becomes the fluid channel media is a tension joint on the shear zone with Northwest strike with dip direction toward Northeast which has NW-SE orientation of right slip fault (Figure 8)

Summary

Introduction

Gedongsongo is an area that has a manifestation of hot water on Mount Ungaran. The development of Gedongsongo research began with [2], which included the Gedongsongo area as a unit of Gajah Mungkur and Sindoro Volcanic Unit in a stratigraphic. There is no research related to groundwater which is an important element of the hydrological cycle in geothermal systems. The relatively young geological structure and different lithological variations affect the type and response of groundwater to rocks. Based on these explanations the author feels the need to research groundwater hydrostructure in the manifestation of Gedongsongo geothermal Ungaran, Semarang, Central Java

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