?url_ver=Z39.88-2004&rft_id=lib.sttnas.ac.id&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=https%3A%2F%2Frepository.itny.ac.id%2Fid%2Feprint%2F2567%2F&rft.title=STRATIGRAFI+BATUAN+GUNUNGAPI+DI+DAERAH+WUKIRHARJO%2C+KECAMATAN+PRAMBANAN%2C+SLEMAN+YOGYAKARTA&rft.creator=S.+Bronto%2C+.&rft.creator=Hill+Gendoet+Hartono%2C+.&rft.creator=S.+Pambudi%2C+.&rft.subject=QE+Geology&rft.description=SARI%0D%0ATiga+satuan+batuan+gunungapi+tersingkap+di+Desa+Wukirharjo%2C+Kecamatan+Prambanan%2C+Sleman+Yogyakarta%2C+yakni+(1)+Perselingan+lava+dan+breksi+piroklastika%2C+(2)+Breksi+epiklastika+dan+(3)+Tefra+batuapung.+Satuan+batuan+pertama+berkomposisi+andesit+dan+di+dalam+breksi+piroklastika+banyak+mengandung+bom+gunungapi%2C+diameter+rata-rata+terbesar+78+cm+dengan+sumbu+terpanjang+butir+mengarah+U30oT.+Bongkah+andesit+segar+mencapai+ukuran+2%2C5+m+%E2%80%93+8%2C0+cm%2C+sedangkan+bongkah+batuan+terubah+1%2C3-1%2C6+m.+Perselingan+aliran+lava+dengan+breksi+piroklastika+dipandang+sebagai+bagian+dari+fasies+proksimal+suatu+kerucut+gunungapi+komposit.+Berdasarkan+orientasi+butir+bom+gunungapi+dan+ditemukannya+bongkah+sangat+kasar+andesit+dan+batuan+ubahan+serta+aliran+lava+maka+diperkirakan+sumber+erupsi+terletak+di+sebelah+timur-timurlaut%2C+tidak+jauh+dari+daerah+penelitian.+Kegiatan+volkanisme+Tersier+ini+kemudian+berhenti+sama+sekali+dan+diikuti+dengan+sedimentasi+breksi+epiklastika+sebagai+satuan+batuan+kedua+yang+terdiri+dari+konglomerat%2C+breksi+konglomeratan+dan+batupasir%2C+berumur+Miosen+(N5-N18)+dan+diendapkan+di+lingkungan+laut+dangkal.+Satuan+batuan+ketiga+terdiri+dari+tuf%2C+batulapili+dan+breksi+batuapung.+Komposisi+ini+mencerminkan+hasil+letusan+kaldera+gunungapi+yang+merupakan+perioda+penghancuran+suatu+kerucut+gunungapi+komposit.%0D%0AKata+kunci%3A+breksi+epiklastika%2C+breksi+piroklastika%2C+lava%2C+stratigrafi+gunungapi%2C+tefra%2C+ubahan+hidrotermal%2C+Wukirharjo%2C+Prambanan%2C+Yogyakarta.%0D%0AABSTRACT%0D%0AThree+volcanic+rock+units+are+exposed+at+Candisari+River%2C+Wukirharjo+village%2C+Prambanan+Yogyakarta%2C+i.e.+(1)+Alternating+lavas+and+pyroclastic+breccias%2C+(2)+Epiclastic+breccias+and+(3)+pumice-rich+tephras.+The+first+rock+unit+has+andesitic+in+composition+and+the+pyroclastic+breccias+contain+a+lot+of+volcanic+bombs+in+which+the+largest+bombs+have+an+average+diameter+78+cm+directing+to+N30oE.+The+coarsest+andesitic+blocks+range+from+2.5+m+to+80+m%2C+while+hydrothermally+altered+blocks+have+1.3-1.6+m.+The+alternation+of+lava+flows+and+pyroclastic+breccias+is+considered+as+a+part+of+proximal+facies+of+composite+volcanic+cone.+Based+on+orientation+of+volcanic+bombs+and+the+present+of+very+coarse+andesitic+blocks%2C+altered+blocks+and+lava+flows+it+is+suggested+that+the+eruption+source+was+located+in+the+northest+side%2C+nearby+the+research+area.+This+Tertiary+volcanic+activity+ceased+and+was+followed+by+sedimentation+of+epiclastic+breccias+as+the+second+rock+unit.+This+unit+composes+of+conglomerates%2C+conglomeratic+breccias+and+sandstone+that+hava+Miocene+(N5-N18)+in+age+and+were+deposited+in+a+shallow+marine+environment.+The+third+rock+unit+comprises+tuffs%2C+lapillistones+and+pumice+breccias.+This+composition+implies+a+product+of+an+explosion+caldera+as+a+destructive+phase+of+a+composite+volcanic+cone.%0D%0AKeywords%3A+epiclastic+breccia%2C+lava%2C+pyroclastic+breccia%2C+tephra%2C+volcanostratigraphy%2C+hydrothermally+altered%2C+Wukirharjo%2C+Prambanan%2C+Yogyakarta.%0D%0A*)&rft.publisher=STTNAS&rft.date=2005-04-01&rft.type=Other&rft.type=NonPeerReviewed&rft.format=text&rft.language=id&rft.identifier=https%3A%2F%2Frepository.itny.ac.id%2Fid%2Feprint%2F2567%2F1%2F4_STRATIGRAFI%2520BATUAN%2520GUNUNGAPI%2520DI%2520DAERAH%2520WUKIRHARJO%252CKECAMATAN%2520PRAMBANAN%252C%2520SLEMAN%2520YOGYAKARTA.pdf&rft.identifier=++S.+Bronto%2C+.+and+Hill+Gendoet+Hartono%2C+.+and+S.+Pambudi%2C+.++(2005)+STRATIGRAFI+BATUAN+GUNUNGAPI+DI+DAERAH+WUKIRHARJO%2C+KECAMATAN+PRAMBANAN%2C+SLEMAN+YOGYAKARTA.++STTNAS%2C+itny.ac.id.+++++&rft.relation=https%3A%2F%2Fwww.lib.ac.id&rft.relation=lib.sttnas.ac.id&rft.identifier=lib.sttnas.ac.id