Mulyanto, Djoko (2008) STUDI KETIDAK SELARASAN ANTARA TANAH DAN BATUAN KARBONAT YANG MEMBAWAHINYA PADA JALUR BARON – WONOSARI GUNUNGKIDUL. Agrin, 12 (2). pp. 181-190. ISSN 1410-0029
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Abstract
Tujuan penelitian adalah mengaji ketidakselarasan antara tanah dan batuan karbonat yang membawahinya. Analisis baik tanah maupun batuan karbonat meliputi komposisi mineral dan kimia. Komposisi mineral fraksi pasir tanah di atas batugamping dirajai oleh labradorit sedangkan fraksi lempungnya oleh haloisit dan kaolinit. Kristobalit juga dijumpai terutama pada tanah-tanah di lingkungan karst. Berdasarkan macam mineral tersebut diduga bahan induk tanah banyak dipengaruhi oleh bahan volkanik. Komposisi batugamping dirajai kalsit dan kuarsa. Terdapat perbedaan yang tegas antara komposisis mineral tanah dan batugamping, nisbah Fe tanah dan batugamping sangat rendah, adanya lithic contact yang sangat tegas. Terdapat mintakat pelapukan napal yang membawahi tanah, nisbah Fe tanah/ napal jauh lebih tinggi dibanding terhadap batugamping, kadar CaCO3 napal rendah, dan baik tanah mapun napal mengandung smektit sehingga dikatakan bahwa napal bersifat mewariskan pada tanah yang terbentuk. Labradorit juga melimpah pada tanah di atas napal. Berdasarkan faktor-faktor tersebut maka disimpulkan bahwa ada ketidakselarasan antara tanah dan batugamping yang membawahinya kecuali pada napal. Bahan volkanik sangat berpengaruh sebagai bahan induk tanah. Kata kunci: batuan karbonat, bahan volkanik, batugamping, tanah, ketidakselarasan ABSTRACT The aim of research was to study of the unconformity of soil–carbonate rock underlying relationship. Analysis both soil and carbonate rock cover minerals and chemical composition. Sand fraction mineral composition of soil overlying limestone dominated by labradorite whereas clay fraction by halloysite and kaolinite. Chrystobalite also was found especially on soils of karst area. Based of those minerals, soil parent material predicted much be influenced by volcanic material. Limestone mineral composition dominated by calcite and quartz. There are distict differences of carbonate mineral composition and soils, ratio Fe of soil/ limestone is very low, and there is a sharply lithic contact of soil and limestone underlying. Soils overlying marl show paralithic contact, there is a zone of marl weathering, and ratio Fe of soil to marl is higher than ratio Fe of soil to limestone, and CaCO3 concentration lower than limestone. Both soils and marl underlying contain smectite. Based factors above be said that marl have inheritate characteristic. Sand fraction minerals of soil overlying marl are also dominated by labradorite. Based on boundary of soil and rock material underlying and kind of minerals concluded that there are unconformity between soils and limestone underlying, but relationship between soils and marl underlying are conformity. Soils underlying carbonate material much be influenced by volcanic material. Key words: carbonate, volcanic materials, limestone, soil, unconformity
| Item Type: | Article |
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| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | S.kom DINA SYAHFITRI |
| Date Deposited: | 28 Jan 2019 02:17 |
| Last Modified: | 28 Jan 2019 02:17 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/18210 |
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