DOI: https://doi.org/10.14710/jgt.6.2.2023.64-72

SOUTHERN TASIKMALAYA ANCIENT SUBMARINE VOLCANO: VESTIGES OF ERUPTIONS AND THEIR DIVERSITY AS GEOLOGICAL HERITAGE

1Geological Museum, Geological Agency, Ministry of Energy and Mineral Resources, Jl. Diponegoro 57, Bandung, 40122, Indonesia

2Departement of Geological Engineering, Faculty of Engineering, Universitas Diponegoro, Jl. Prof. Soedarto S.H., Tembalang, Semarang, Indonesia, Indonesia

Received: 3 Mar 2023; Revised: 18 Aug 2023; Accepted: 5 Sep 2023; Available online: 18 Dec 2023; Published: 18 Dec 2023.
Open Access Copyright (c) 2023 Jurnal Geosains dan Teknologi under http://creativecommons.org/licenses/by-sa/4.0.

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Abstract
In the southern Tasikmalaya area West Java Province, Indonesia, there are Tertiary volcanic rocks, with an east-west trending distribution pattern.  Physiographically, this area is included in the southern mountain zone of West Java and is generally composed of tuff and polymic breccias with intercalated of lava and limestone which are grouped into the Jampang Formation and Genteng Members Jampang Formation. The existence of these volcanic and sedimentary rocks of Oligocene – Middle Miocene in the area is an indication of submarine volcano. The purpose of this paper to identify traces of eruptions and submarine volcano products found in the southern Tasikmalaya area, for further assessment of the geological diversity potential as a geological heritage. The method used are field data collection and quantitative data analysis, namely identification of geological heritage based on "Technical Guidelines for the Assessment of Geological Heritage Resources". The submarine volcano products which found in this area are peperite, and basaltic andesite lava at Karang Tawulan Beach, traces of alteration, and hydrothermal mineralization like jasper Panca Tengah, and Cipatujah volcanogenic massive sulphide. This shows that volcanic activities in the southern Tasikmalaya took place continuously from Oligocene to Middle Miocene. From the results of the assessment, the geological diversity in this area has a scientific value of "medium-high".
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Keywords: basaltic andesite lava; geological heritage; jasper; peperite; southern Tasikmalaya; submarine volcano

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