A PRELIMINARY VIEW AND IMPORTANCE OF METAMORPHIC GEOLOGY FROM JIWO HILLS IN CENTRAL JAVA
Jiwo Hills is an isolated hill with approximately occupied 30 km 2 in Bayat area of Central Java. The Jiwo Hills has been considered to be composed of very low-grade metamorphic rocks. This contribution explains a preliminary view of the metamorphic rocks from collected rocks sample in the Ji...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Teknik Geologi Universitas Gadjah Mada
2013
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| Subjects: | |
| Online Access: | https://repository.ugm.ac.id/135116/1/11-23%20BPS02.pdf |
| _version_ | 1797036336791683072 |
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| author | Nugroho Imam Setiawan, Nugroho Yasuhito Osanai, Yasuhito Carolus Prasetyadi, Carolus |
| author_facet | Nugroho Imam Setiawan, Nugroho Yasuhito Osanai, Yasuhito Carolus Prasetyadi, Carolus |
| author_sort | Nugroho Imam Setiawan, Nugroho |
| collection | UGM |
| description | Jiwo Hills is an isolated hill with approximately occupied 30 km
2
in Bayat area of Central Java.
The Jiwo Hills has been considered to be composed of very low-grade metamorphic rocks. This
contribution explains a preliminary view of the metamorphic rocks from collected rocks sample in
the Jiwo Hills.
Common metamorphic rocks found in this area are phyllite, mica schist, calc-silicate schist, and
marble with the foliation trend of NE-SW. Most of the metamorphic rock exposures are strongly
weathered. Rarely epidote-glaucophane schist crop out near the exposure of serpentinite in western
part of this complex. Several carbonate sedimentary rocks are converted to garnet-wollastonite
skarn under the contact metamorphism probably caused by diabase intrusion.
Garnet-wollastonite skarn mainly consists of garnet and wollastonite embed in the quartz matrix.
The garnets are rich of grossular composition, range from Adr13–19Grs81–85Sps0–2. Those show
anisotropic, with sectorial twinning zonings. The skarn deposits might give important information
for economic resources in this area.
Epidote-glaucophane schist mainly consists of glaucophane, epidote, quartz, phengite, titanite, and
hematite. By the present of this blueschist facies of high-pressure metamorphic rock in this area, it
confirms that Jiwo Hills is one of the high-pressure metamorphic terranes together with Luk Ulo
Complex of Central Java, Meratus Complex of South Kalimantan, and Bantimala Complex of
South Sulawesi. The serpentinites might facilitate exhumation of the blueschist in the Jiwo Hills.
Detailed study of the distribution of metamorphic rocks in this area is needed in order to
understanding tectonic evolution as well as economic geology.
Keywords: Jiwo Hills, Bayat, blueschist, high-pressure metamorphic rocks, skarn |
| first_indexed | 2024-03-13T23:44:15Z |
| format | Article |
| id | oai:generic.eprints.org:135116 |
| institution | Universiti Gadjah Mada |
| language | English |
| last_indexed | 2024-03-13T23:44:15Z |
| publishDate | 2013 |
| publisher | Teknik Geologi Universitas Gadjah Mada |
| record_format | dspace |
| spelling | oai:generic.eprints.org:1351162015-09-04T01:53:14Z https://repository.ugm.ac.id/135116/ A PRELIMINARY VIEW AND IMPORTANCE OF METAMORPHIC GEOLOGY FROM JIWO HILLS IN CENTRAL JAVA Nugroho Imam Setiawan, Nugroho Yasuhito Osanai, Yasuhito Carolus Prasetyadi, Carolus Geology Jiwo Hills is an isolated hill with approximately occupied 30 km 2 in Bayat area of Central Java. The Jiwo Hills has been considered to be composed of very low-grade metamorphic rocks. This contribution explains a preliminary view of the metamorphic rocks from collected rocks sample in the Jiwo Hills. Common metamorphic rocks found in this area are phyllite, mica schist, calc-silicate schist, and marble with the foliation trend of NE-SW. Most of the metamorphic rock exposures are strongly weathered. Rarely epidote-glaucophane schist crop out near the exposure of serpentinite in western part of this complex. Several carbonate sedimentary rocks are converted to garnet-wollastonite skarn under the contact metamorphism probably caused by diabase intrusion. Garnet-wollastonite skarn mainly consists of garnet and wollastonite embed in the quartz matrix. The garnets are rich of grossular composition, range from Adr13–19Grs81–85Sps0–2. Those show anisotropic, with sectorial twinning zonings. The skarn deposits might give important information for economic resources in this area. Epidote-glaucophane schist mainly consists of glaucophane, epidote, quartz, phengite, titanite, and hematite. By the present of this blueschist facies of high-pressure metamorphic rock in this area, it confirms that Jiwo Hills is one of the high-pressure metamorphic terranes together with Luk Ulo Complex of Central Java, Meratus Complex of South Kalimantan, and Bantimala Complex of South Sulawesi. The serpentinites might facilitate exhumation of the blueschist in the Jiwo Hills. Detailed study of the distribution of metamorphic rocks in this area is needed in order to understanding tectonic evolution as well as economic geology. Keywords: Jiwo Hills, Bayat, blueschist, high-pressure metamorphic rocks, skarn Teknik Geologi Universitas Gadjah Mada 2013-12-11 Article PeerReviewed application/pdf en https://repository.ugm.ac.id/135116/1/11-23%20BPS02.pdf Nugroho Imam Setiawan, Nugroho and Yasuhito Osanai, Yasuhito and Carolus Prasetyadi, Carolus (2013) A PRELIMINARY VIEW AND IMPORTANCE OF METAMORPHIC GEOLOGY FROM JIWO HILLS IN CENTRAL JAVA. Prosiding Seminar Nasional Kebumian Ke-6 Teknik Geologi Universitas Gadjah Mada, 11-12 Desember 2013. |
| spellingShingle | Geology Nugroho Imam Setiawan, Nugroho Yasuhito Osanai, Yasuhito Carolus Prasetyadi, Carolus A PRELIMINARY VIEW AND IMPORTANCE OF METAMORPHIC GEOLOGY FROM JIWO HILLS IN CENTRAL JAVA |
| title | A PRELIMINARY VIEW AND IMPORTANCE OF
METAMORPHIC GEOLOGY FROM JIWO HILLS IN
CENTRAL JAVA |
| title_full | A PRELIMINARY VIEW AND IMPORTANCE OF
METAMORPHIC GEOLOGY FROM JIWO HILLS IN
CENTRAL JAVA |
| title_fullStr | A PRELIMINARY VIEW AND IMPORTANCE OF
METAMORPHIC GEOLOGY FROM JIWO HILLS IN
CENTRAL JAVA |
| title_full_unstemmed | A PRELIMINARY VIEW AND IMPORTANCE OF
METAMORPHIC GEOLOGY FROM JIWO HILLS IN
CENTRAL JAVA |
| title_short | A PRELIMINARY VIEW AND IMPORTANCE OF
METAMORPHIC GEOLOGY FROM JIWO HILLS IN
CENTRAL JAVA |
| title_sort | preliminary view and importance of metamorphic geology from jiwo hills in central java |
| topic | Geology |
| url | https://repository.ugm.ac.id/135116/1/11-23%20BPS02.pdf |
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