Email this article MATERIAL VOLKANIK SEBAGAI PENYUSUN UTAMA TANAH MERAH DI ATAS BATUAN KARBONAT KARANGSARI WONOSARI
Abstract
Gejala kewarnaan tanah yang berkembang pada batuan karbonat yang secara umum berwarna putih sangat menarik untuk dikaji mineralnya. Tujuan penelitian ini adalah menelaah komposisi mineral tanah. Analisis sifat mineral meliput: mineral fraksi pasir halus (bubuk) dan fraksi lempung tanah, serta batugamping yang membawahi tanah tersebut. Identifikasi mineral mengunnakan XRD. Hasil penelitian menunjukkan bahwa mineral haloisit 7 oA sangat mendominasi fraksi lempung tanah, disamping oksida-oksida besi khususnya gutit. Fraksi pasir halus menunjukkan mineral feldspar, biotit, kristobalit dan kuarsa pada lapisan pertama sedangkan lapisan bawah terdiri atas gutit, maghemit-magnetit, kuarsa, dan rhodokrosit. Analisis mineral batugamping (powder) menunjukkan mineral kalsit sangat dominan, sedangkan mineral yang lain adalah kuarsa dan maghemit-magnetit. Berdasarkan komposisi mineral baik fraksi pasir maupun lempung, serta nisbah Fe tanah/ batuan, diduga bahwa bahan induk tanah banyak dipengaruhi oleh material volkanik.
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DOI: https://doi.org/10.31315/jta.v17i2.4234
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