GENESIS OF PONJONG PINK LIMESTONE, GUNUNGKIDUL, SPECIAL REGION OF YOGYAKARTA – INDONESIA (GENESA BATUGAMPING MERAH MUDA PONJONG, GUNUNGKIDUL, DAERAH ISTIMEWA YOGYAKARTA - INDONESIA)
The Ponjong pink limestone is located in the Gunungkidul Regency, approximately 60 km southeast of Yogyakarta. The rock belongs to member of Wonosari-Punung Formation of Southern Mountains. The mineralogical and geochemical characteristics of the pink limestone provide an important background...
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| Main Authors: | , |
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| 格式: | Article PeerReviewed |
| 語言: | English |
| 出版: |
Departmen Teknik Geologi
2015
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| 主題: | |
| 在線閱讀: | https://repository.ugm.ac.id/135494/1/GEO97%20GENESIS%20OF%20PONJONG%20PINK%20LIMESTONE%2C%20GUNUNGKIDUL%2C%20SPECIAL%20REGION%20OF%20YOGYAKARTA%20INDONESIA%20%28GENESA%20BATUGAMPING%20MERAH%20MUDA%20PONJONG%2C%20GUNUNGKIDUL%2C%20DAERAH%20ISTIMEWA%20YOGYAKARTA%20INDONESIA%29.pdf https://repository.ugm.ac.id/135494/ |
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| 機構: | Universitas Gadjah Mada |
| 語言: | English |
| 總結: | The Ponjong pink limestone is located in the Gunungkidul Regency, approximately 60 km southeast of
Yogyakarta. The rock belongs to member of Wonosari-Punung Formation of Southern Mountains. The
mineralogical and geochemical characteristics of the pink limestone provide an important background
to understanding the origin of the rock. The petrographical observation and X-ray diffraction results
indicate that the pink limestone is characterized by calcite, algae, foraminifera and very small amount
of siderite and titanite. Major element analysis of the rock shows an anomalous high content of Fe
2O3
(0.51 wt. %) and TiO2 (0.04 wt. %). In comparison, the white-grey limestone from the same area of the
pink limestone, contains very low Fe
2O3 (0.10 wt. %) and TiO2 (0.01 wt. %). The reasonably higher
content of Fe
2O3 and TiO
2 in the pink limestone may correspond to the enrichment of the compounds
in the rock. The enrichment could be occur syn and/or post deposition of the Wonosari-Punung
limestone. Source of the Fe2O3 and TiO
2 may derived from terrigenous particles of Nglanggran
Formation as this formation is typified by relatively high contents of Fe2O3 (5.26-6.92 wt. %), TiO
2
(0.67-0.87 wt.%) and SiO
2 (56.5-65.3% wt.%). Fe
2+
of the Fe
2O3
might partially replace Ca
2+
of
calcite (CaCO
3), formed siderite (FeCO3), as siderite is isomorphs with calcite. Probably, titanite
(CaTiOSiO4) was a result of reaction of the limestone and the terrigenous materials. The siderite and
titanite are typically pinkish red to yellowish brown in color and are therefore interpreted to be
responsible in giving pink color of the limestone. |
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