Soesilo, Joko and Suparka, Emmy and Abdullah, Chalid Idham (2011) Study on Garnet From Meratus Complex, South Kalimantan and Its Usefulness on Diamond Source Tracking. In: Seminar Nasional Kebumian 2011 Pengembangan IPTEK Kebumian untuk Menunjang Pembangunan Insani yang Berkelanjutan, 8-9 DESEMBER 2011, YOGYAKARTA.
|
Text
2011_Prosiding Seminar Nasional Kebumian UPNVY_Study on Garnet From Meratus Complex, South Kalimantan and Its Usefulness on Diamond Source Tracking.pdf Download (9MB) | Preview |
Abstract
Garnet bearing metamorphic rocks of the Meratus Complex, South Kalimantan show two different characters. The first is blueschist metapelite, associated with other greenschist-epidote amphibolite facies rocks which suffered retrogression from high to low pressure influence. They contain fine-grain garnet ( ~ 0.145 mm) in their assemblage. Garnet presents as spessartine and grossular-almandine with composition of Alm9.1-27.3Prp0.9-2.5Grs14.8-20.6Adr0-4.5Sps51.9-70.5 and Alm27.4-45.7Prp0.8-2.8Grs27.3-52.7Adr1.9-3.4Sps15.5-35.8 respectively. Rocks are exposed in the south-west part of the complex, precisely in the vicinity of Aranio-Pelaihari, adjacent to the diamond placer mines at Cempaka village, south of Banjarbaru. The second is garnet-granulite (high pressure granulite) which are associated and windowed inside the Manjam ophiolites. These rocks are located on the eastern slope of the complex and is further away from diamond placer mining locations. Its garnet is pyrope-almandine ( ~ 3.06 mm) with composition of Alm39.5-42Prp28.8-46.3Grs7.7-31Adr0-8.7Sps1-2. In some samples, its core has more pyrope molecule instead of the almandine, while in the rim, the pyrope molecule are always slightly smaller. Some samples contain Cr molecule of some 0.002 – 0.007. Pyrope is Mg-rich garnet formed at high pressure environment. Generally its existence are in eclogite and in kimberlite, both which enables contain diamonds. Pyrope is tracer mineral for high pressure rock formation, and knorringite is typical species in kimberlite. This study represents an initial approach done in such tracing. Keywords: garnet, metapelite, spessartine, grossular, almandine, pyrope, eclogite and kimberlite
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Subjects: | Q Science > QD Chemistry Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | JOKO SOESILO - |
| Date Deposited: | 18 Sep 2017 08:30 |
| Last Modified: | 18 Sep 2017 08:30 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/12895 |
Actions (login required)
 |
View Item |