Geology and Petrogenesis of Igneous Rocks from Batur Paleovolcano, Gunungkidul, Yogyakarta: Evidence from their Textures, Mineralogy, and Major Elements Geochemistry
Fahmi Hakim(1*), Yanuardi Satrio Nugroho(2), Cendi Diar Permata Dana(3), Anastasia Dewi Titisari(4)
(1) Geological Engineering Departement, Universitas Gadjah Mada
(2) Geological Engineering Departement, Universitas Gadjah Mada
(3) Geological Engineering Departement, Universitas Gadjah Mada
(4) Geological Engineering Departement, Universitas Gadjah Mada
(*) Corresponding Author
Abstract
geochemistry analysis showed the rocks are characterized by intermediate silica with low alkali content. They are can be categorized as calc-alkaline series. However, some samples are fall into tholeiitic series. Major elements variation and textural study also indicate the magma is experienced differentiation process by fractional crystallization mechanism. This study suggests that igneous rocks from Batur paleovolcano is formed by two phases of formation. Earlier phase is the formation of andesite lava in island arc tholeiitic tectonic setting then at the later phase is formation of diorite intrusion in the calc-alkaline basalts tectonic setting.
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DOI: https://doi.org/10.22146/jag.48739
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