Abstract
Wonosari-Punung Formation of Middle Miocene-Pliocene and Semilir Formation of Early-Middle Miocene consists of Gunung Sewu Karst Landscape in Ponjong and Semanu District; Gunungkidul Regency. Gunung Sewu Karst Landscape has advanced karstification so that the morphology of exokarst and endokarst could be formed. Cave entrance as a marker of the endokarst morphology existence is formed by varying morphometry. This research aims to determine cave entrance distribution pattern based on a cave entrance morphometry. These research variables are cave entrance morphometry; geological formation; and geological structure (geological lineament). The analytical method uses nearest neighbour analysis (NNA) and lineament analysis. The result of this research shows that vertical cave entrance with oval; narrow; and irregularity shape have dispersed distribution pattern in Wonosari-Punung Formation. Horizontal cave entrance with irregular; rectangular; narrow; and an oval shape; have clustered pattern of distribution in the Wonosari-Punung and Semilir Formations. This research is used as a preliminary study for the development of underground water resources that are commonly found in caves of Gunung Sewu Karst Landscape.
Highlights
Gunung Sewu Karst Landscape at Ponjong and Semanu Districts consists of Wonosari-Punung Formation (Tmwl), Semilir Formation (Tms), and Oyo Formation (Tmo)[1].the percentage of Oyo Formation is 0,2%, it is very small compared to the two other formations that compose Gunung Sewu Karst Landscape[1A]
Gunung Sewu Karst Landscape has advanced karstification until reaching mature genesis stadium.It can be seen from the existence of endokarst morphology[4].Cave entrance as a marker of the endokarst morphology existence is formed by varying morphometry [5].Zhou et al, (2017) have conducted research on the cave entrance distribution pattern in Guizhou (China), the result, cave entrance distribution in Guizhou is influenced by rock layers, properties, formations, and hydrology [6]
Based on the nearest neighbour analysis, vertical cave entrances have a dispersed distribution pattern in Wonosari-Punung Formation with the nearest neighbour ratio value of 1,46 and cave entrance with oval shape which measures from 4,2-2.089 m2, narrow shape which measures from 3,8-6,3 m2, and irregular shape which measures from 7.558 m2
Summary
Gunung Sewu Karst Landscape at Ponjong and Semanu Districts consists of Wonosari-Punung Formation (Tmwl), Semilir Formation (Tms), and Oyo Formation (Tmo)[1].the percentage of Oyo Formation is 0,2%, it is very small compared to the two other formations that compose Gunung Sewu Karst Landscape[1A]. Gunung Sewu Karst Landscape has advanced karstification until reaching mature genesis stadium.It can be seen from the existence of endokarst morphology (cave)[4].Cave entrance as a marker of the endokarst morphology existence is formed by varying morphometry [5].Zhou et al, (2017) have conducted research on the cave entrance distribution pattern in Guizhou (China), the result, cave entrance distribution in Guizhou is influenced by rock layers, properties, formations, and hydrology [6]. This research is used as a preliminary study for the development of underground water resources that are commonly found in caves of Gunung Sewu Karst Landscape. The utilization of underground water resources in Gunung Sewu Karst Landscape that can sufficient of community needs have a significant role in reducing the utilization of fossil fuel on water transport from non-karst area to karst area during the dry season. This research participate to create a low carbon society
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