Characteristics of Volcanic Rock In The Bualemo Area, North Gorontalo District Based On Petrographic Analysis Aang Panji Permana, Fandji Marfian, Noviar Akase, Muhammad Kasim E3s Web of Conferences, 2023 The research was conducted in Bualemo Area, Kwandang District, North Gorontalo Regency. The aim of this study was to analyze the petrogenesis of volcanic rocks in the Bualemo Area, North Gorontalo Regency. A mapping technique was utilized in this work to assess the geological conditions of the research site, and petrographic analysis was used to assess the mineral content and rock texture. The findings revealed the stratigraphy of the research region, including an altered andesite unit, an andesite unit, and an alluvial deposit unit, when sorted from old to new. The results of the petrographic analysis show that the rock has a cumoloporphyritic texture, with phenocryst (25%) consisting of plagioclase (60%), k-feldspar (30%), and pyroxene (7%). Pyroxene minerals are all present as phenocrysts, measuring 0.5-0.8 mm, in subhedral-anhedral shape, measuring 0.5-1.5 mm, phenocrysts are starting to turn into secondary minerals, and some are present as relict minerals. The groundmass (75%) consists of predominant plagioclase and minor K-feldspar. The rock is basaltic andesite.
Conservation Management of Agriculture Land using Geospatial Approach (A Case Study in the Bone Watershed, Gorontalo Province, Indonesia) Sri Maryati, Sunarty Eraku, Muh Kasim E3s Web of Conferences, 2018 Bone Watershed is one of the major watersheds in Gorontalo Province. Bone watershed has a very important role for the people of Gorontalo Province. The role of Bone Watershed is mainly related to the providing clean water, producing oxygen, controlling flood, providing habitat for endemic flora fauna and other environmental functions. The role of Bone Watershed for the community’s economic sector is also very important, the Bone watershed provides livelihood for surrounding communities includes fertile land resources for agriculture and plantations, forest products, and livestock feed. This research is important considering the Bone watershed has limited availability of land for agriculture and the high risk of natural disasters such as floods and landslides. Geospatial data includes topography map, landform map, soil map, integrated with field survey results and soil properties were analized to determine conservation management of agriculture land in the Bone Watershed, Gorontalo Province, Indonesia. The result of this study shows that based on soil properties and physical land characteristics, land use for agriculture should consider appropriate conservation techniques, land capability and respect to local wisdom.
Hydrothermal alteration mineralogy associated with gold mineralization in Buladu Area, Gorontalo, Northern Sulawesi, Indonesia Ulva Ria Irfan, Irzal Nur, Muhammad Kasim International Journal on Advanced Science Engineering and Information Technology, 2017 Geologically, the Buladu area is part of the North Sulawesi magmatic arc, located in the morphology of the mountains along the coastline of North Gorontalo district, Indonesia. Multiple subductions of North Sulawesi in the northern arm of Sulawesi and east Sangihe subduction in the east has triggered an active magmatism and volcanism. Formation and occurrences deposits of precious- and base metals have been found in the North Sulawesi Volcanic Arc. This paper describes a recent study on hydrothermal alteration mineralogy associated with one of the prospects in the region, namely Buladu gold prospect that for years has been operated by local artisanal miners. The study is focused on hand specimen and microscopic observation as well as XRD analysis. Lithologically, the study area is arranged by sandstone are members of Dolokapa volcano-sedimentary formation, above unconformity andesitic-basaltic volcanic breccia are members of the Pliocene Wobudu Formation and is intruded by granodiorite rocks. The petrographic study reveals that host rock of the mineralization is flow-volcanic breccia which shows porphyritic and flows structures. Resulting assemblages of secondary minerals are mineral associations characteristic of the magmatic-hydrothermal system the following imperative alteration zones could be recognized an outer zone of chloritic alteration and the inner zone of argillic alteration. The alteration showed characteristics of pervasive to selective alteration, where clay and quartz totally replaced groundmass, whereas chlorite and clay minerals were selectively altered plagioclase phenocrysts. Clay mineral species identified by XRD include chlorite and illite. These mineralogical features indicate that the hydrothermal alteration is an argillic type, which is spatially distal to the mineralization. Mafic mineral in andesite lava partly altered into mineral assemblage chlorite-epidote-quartz-carbonate show propylitic type, which is the outermost zone of mineralization.
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