Petrography and geochemistry of structural limestones in the Pringkuku Karst area, Pacitan, East Java

Ayi Syaeful Bahri*, Silmi Afina Aliyan, Amien Widodo, Miftakhur Rahmat, A. Hilyah, Moh Singgih Purwanto, M. H.M. Fajar, Putry Vibry Hardyani, Endriana Wahyu Alita, Sunardi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The Pringkuku karst area is located in the south-west of East Java. Pringkuku is a transition zone between Gunung Sewu karst hills in the west and Gerindulu structural areas in the east. Sample observations were carried out by considering four parameters: structural and non-structural reef limestone from Wonosari Formation (Tmwl) and structural and non-structural clastic limestone from Oyo Formation (Tmo). Wonosari Formation and Oyo Formation were traversed by the fault trending northeast-southwest in the Eastern Pringkuku region. Reef limestone units of Wonosari Formation consist of calcite and dolomite, while clastic limestone units of Oyo Formation are dominated by calcite. Both of limestone lithologies undergone process of diagenesis, in non-structural limestone, the crystal still has a euhedral form while the structural unit does not have an almost rounded shape due to dissolution. There are Ca, MgO, and SiO2 contents from clastic and reefs limestone units and dolomite minerals were found in several samples from reef limestone units. Based on petrographic studies, clastic limestone units can be classified as lime-packstone, while reef limestone units can be classified as lime-boundstone and lime-wackestone. Petrographic and geochemical analysis results on clastic limestones show an increase in its main constituent elements such as calcite and magnesium, whereas, in structural limestones samples, there are additional quartz minerals and periclase minerals. Meanwhile, petrographic and geochemical analysis results on reef limestones show that the main constituents in structural and non-structural limestone are calcite and dolomite minerals.

Original languageEnglish
Title of host publicationInternational Conference on Electromagnetism, Rock Magnetism and Magnetic Material, ICE-R3M 2019
EditorsSunaryono Sunaryono, Ann Marie Hirt, Jason Scott Herrin, Nordiana Mohd Muztaza, Markus Diantoro, Satria Bijaksana
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735420106
DOIs
Publication statusPublished - 18 Aug 2020
Event2019 International Conference on Electromagnetism, Rock Magnetism and Magnetic Material, ICE-R3M 2019 - Malang, Indonesia
Duration: 18 Sept 201919 Sept 2019

Publication series

NameAIP Conference Proceedings
Volume2251
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2019 International Conference on Electromagnetism, Rock Magnetism and Magnetic Material, ICE-R3M 2019
Country/TerritoryIndonesia
CityMalang
Period18/09/1919/09/19

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