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Petrography and Geochemistry of Structural Limestones in The Pringkuku Karst Area, Pacitan, East Java
Ayi Syaeful Bahri(a*), Silmi Afina Aliyan (b), Amien Widodo (c), Miftakhur Rahmat (d), Anik Hilyah (e), Moh Singgih Purwanto (f), M H M Fajar (g), Putry Vibry Hardyani (h), Endriana Wahyu Alita (i), Sunardi (j)

a) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
*nugrahabahri[at]gmail.com
b) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
c) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
d) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
e) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
f) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
g) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
h) Geophysical Egineering Department
Faculty of Civil Engineering, Environment, and Geo Engineering
Sepuluh Nopember Institute of Technology
i) Badan Penelitian dan Pengembangan Daerah
Jl. DR. Wahidin No. 07 A Pacitan
j) PPI Madiun, BPSDM Perhubungan, Kemenhub
Jl. Tirta Raya, Kota Madiun, Jawa Timur 63129


Abstract

The Pringkuku karst area is located at the south-west of East Java. Pringkuku is a transition zone, in the west is the hill karst of mountain sewu and in the east is the structural hills from Gerindulu watershed to the Tegalombo area in the north of Pacitan district. Sampling and sample observations were carried out by considering 4 parameters: structural and non-structural non-clastic limestone from Wonosari Formation (Tmwl) and structural and non structural clastic limestone from Oyo Formation (Tmo). Both of these lithologies were traversed by the fault trending northeast-southwest in the eastern pringkuku region. Non-clastic limestone units consist of calcite and dolomite while clastic limestone units are dominated by calcite. They deposited on shallow-marine zones and have conformity contact. Both of the limestone lithologies undergone process of diagenesis, in non-structural limestones, the crystals still have euhedral forms while in structural units do not have perfect crystalline shapes, almost rounded due to dissolution. Chemical analysis of the two limestones units revealed the content of Ca, MgO and SiO2 and contained dolomite mineral content in several samples from non-clastic units. Based on petrographic studies, clastic units can be classified as lime-packstone and non-clastic units can be classified as lime-boundstone. The results of the petrographic and geochemical analysis showed an increase in quartz content and carbonate micrite in rock samples close to the fault zone and dolomitization in non-clastic units.

Keywords: Petrography; Geochemistry; Oyo Formation; Wonosari Formation; Limestone; Dolomitization

Topic: Geochemistry

Link: https://ifory.id/abstract/7mqZu6jwLH4b

Conference: International Conference on Electromagnetism, Rock Magnetism and Magnetic Material (ICER3M 2019)

Plain Format | Corresponding Author (Ayi Syaeful Bahri)

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