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研究内容

氏名 Rinaldi Ikhram
所属 Graduate of School of International Resource Sciences Department of Geosciences, Geotechnology & Material Engineering for Resources, Akita University
研究者番号
研究分野 PETROLOGY AND VOLCANOLOGY
会議でのプレゼンテーション
研究テーマ名称 PETROLOGY AND GEOCHRONOLOGY OF DISMEMBERED OPHIOLITE IN CILETUH M?LANGE, WEST JAVA, INDONESIA
研究テーマ概要 "Ciletuh Mélange Complex in West Java, Indonesia, is known as a particular and complex geological phenomena and considered one of the key locations in the reconstruction of Indonesia's tectonic history. This area has a unique geology that is exposure of ophiolite and metamorphic rocks of Early Cenozoic age. Sukamto (1975), in Jampang and Balekambang Geological Map Sheet classified these rocks complex into three units of Pre-Tertiary rock, namely Pasir Luhur, Mount Beas and Citirem Formation. The outcrops seems chaotic and mixed up. Those geological situation have led to a group of rocks called mélange (Thayyib, et al., 1977) or olitostrom (Satyana, 2014). In this area, mélange complex composed by the group of ultramafic rocks (ophiolite relatives), a group of metamorphic rocks, sedimentary rock group of the deep ocean and continental sedimentary rock group. All these rocks found as blocks of various size, embedded in the matrix of shale (scally-clay), and the relationship of each unit as a fault contact.

However, the detail for the information regarding these particular rocks especially ophiolites, is relatively rare. Therefore, in order to complete
However, the detail for the information regarding these particular rocks especially ophiolites, is relatively rare. Therefore, in order to complete Indonesia's tectonic puzzle pieces, this thesis will discuss particularly the ophiolite group including peridotites and gabbros. The discussion in this study will focus on petrology, geochemistry and petrotectonic of Ciletuh’s ophiolites to reconstruct the tectonic history of Ciletuh Mélange.
The aims of this study are:
1.to better determine the geochemical characteristics (whole rock, trace elements and REE) and isotopes of serpentinized peridotite and gabbro in Ciletuh. This analysis was conducted to identify the characters of the magma source(s) and possible contaminant(s), and those of the parental magmas.
2.to investigate the tectonic evolution of the Ciletuh ophiolite in terms of spatial changes using paleomagnetic and geochronology using K-Ar age dating.

"
調査結果 A total of 16 samples were brought from Indonesia, consisting of peridotites and gabbros. These samples will be prepared for such as: petrography, SEM-EDS, EPMA, and whole rock geochemistry analysis to obtain provisional results.
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