Magmatic related to hydrothermal alteration in Kulon Progo, Central Java, Indonesia

Harjanto, Agus and SUPARKA, Emmy and ASIKIN, SUKENDAR and YUWONO, Y.S (2006) Magmatic related to hydrothermal alteration in Kulon Progo, Central Java, Indonesia. TEKNIK GEOLOGI, FTM, UPN VETERAN YOGYAKARTA, Yogyakarta.


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The volcanic rocks in Kulon Progo were formed during Oligocene-Miocene time and have undergone alteration since that time. They mostly form the Old Andesite Formation, which consists of interbedded volcanic breccia, tuff, andesite, dacite and diorite. They are part of the magmatic Sunda-Banda Arc. These volcanic rocks have chemical compositions that range from basalt andesite to dacite and from low potassium series to calc-alkaline series. Phenocrysts consist of pyroxene, hornblende, plagioclase, alkali feldspars and quartz. The rocks have under gone hydrothermal alteration and based on mineral alteration assemblages, they can be divided into three alteration zones. These zones are : 1) A phyllic zone that is characterized by quartz-sericite-chlorite, 2) A prophyllitic zone that is characterized by chlorite-epidote-calcite, 3) An argillic zone characterized by illite-kaolinite-monmorilonite.

Item Type: Other
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Dr.ST,MT AGUS HARJANTO
Date Deposited: 26 Mar 2019 04:23
Last Modified: 26 Mar 2019 04:23

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