Geokimia (XRF) Batuan Andesit Desa Biluhu Barat, Kecamatan Biluhu, Kabupaten Gorontalo

Rinto Saputra Hamid, Yayu Indriati Arifin, Noviar Akase

Abstract


This study aims to analyze the geochemical characteristics of andesite rocks within the Tinombo Formation located in Biluhu Barat Village, Biluhu District, Gorontalo Regency. Data collection was conducted through geological mapping and geochemical analysis using X-Ray Fluorescence (XRF) to determine the magma series, magma type, and tectonic setting of the rock origin. The results show that the study area consists of porphyritic andesite and granodiorite units. Geochemical data indicate that the andesite rocks belong to the calc-alkaline magma series, with rock types identified as andesite and basaltic andesite. Geochemical diagrams reveal that the rocks originated from an Island Arc Calc-Alkaline Basalt tectonic setting. The calculated magma source depth ranges from 156 to 164 km, indicating magmatic processes occurring within a subduction zone. This study contributes to a better understanding of the tectonic framework and magmatic evolution in the Gorontalo region.

 


Keywords


Andesite; Geochemistry; XRF; Magma Series; Tectonic Setting

Full Text:

PDF

References


Bachri, S dkk. 1994. Peta Geologi Lembar Tilamuta (Skala 1:250.000). Pusat Penelitian dan Pengembangan Geologi, Bandung.

Bachri, S. 2006. Stratigrafi Lajur Vulkano-Plutonik Daerah Gorontalo, Sulawesi. Jurnal Sumber Daya Geologi. 16 (2): 94-106

Bachri, S. 2011. Structural Pattern and Stress System Evolution during Neogene - Pleistocene Times in the Central Part of the North Arm of Sulawesi. Jurnal Sumber Daya Geologi. 21 (3): 127-135.

Cottam, M.A., Hall, R., Forster, M.A., dan Boudagher-Fadel, M.K. 2011. Basement Character and Basin Formation in Gorontalo Bay, Sulawesi, Indonesia: New Observation from The Togian Island. The SE Asian Gateway: History and Tectonics of The Australia-Asia Collision. 355 (1): 177-202.

Fenton, C. L. 1940. The Rock Book. Doubleday Company. Garden City, New York

Gill, R. 2010. Igneous Rocks and Processes: a Practical Guide. Wiley-Blackwell, John Willey & Sons, Ltd, Publication

Hall, R. dan Wilson, M.E. J. 2000. Neogene Sutures in Eastern Indonesia. Journal of Asian Earth Sciences. 18 (6): 781-800.

Hartono, U., dan Sulistyawan R. I. H. 2011. An Overview of Arc Magma Petrogenesis. JSDG. 21(4)

Irvine, T., dan Baragar W. R. A. 1971. A Guide to the Chemical Classification of the Common Volcanic Rocks. Canadian Journal of Earth Sciences. 8: 523-548.

Kennedy, A. K., Lofgren, G. E., & Wasserburg, G. J. (1993). An experimental study of trace-element partitioning between olivine, ortho-pyroxene and melt in chondrules — equilibrium values and kinetic effects. Earth and Planetary Science Letters, 115(1–4), 177–195.

Le Bas, M.J., Maltre, R., Streckeisen, A., Zannetin, B. 1985. A Chemical Classification of Volcanic- Rocks Based on Total Alkali Silica Diagram. Journal of Petrology. 27 (3): 745-750.

Miyashiro, A., dan Shido, F. 1975. Tholeiitic and Calc-Alkaline Series in Relation to the Behaviors of Titanium, Vanadium, Chromium, and Nickel. American Journal of Science. 275: 265-277.

Mullen, E.D. (1983) MnO/TiO2/P2O5: A Minor Element Discriminant for Basaltic Rocks of Oceanic Environments and Its Implications for Petrogenesis.

Peccerillo, A. & Taylor, S. R. 1976. Geochemistry of Eocene Calc-Alkaline Volcanic Rocks From the Kastamonu Area, Northern Turkey. Contributions to Mineralogy and Petrology 58, 63–81.

Pholbud, P., Hall, R., Advookat, E., Burgess, P., dan Rudyawan, A. 2012. A New Interpretation of Gorontalo Bay, Sulawesi. Proceedings, Indonesian Petroleum Association 36th Annual Convention & Exhibition. May 2012.

Rudyawan, A., Hall, R., White, L.T. 2014. Neogene Extension of the Central North Arm of Sulawesi, Indonesia. American Geophysical Union. Fall Meeting 15-16 December 2014, San Francisco, United States of America.

Sompotan, A.F., 2012, Struktur Geologi Sulawesi, Institut Teknologi Bandung, Bandung.

Wilson, B.M. 2007. Igneous Petrogenesis: A Global Tectonic Approach. Springer Science & Business Media.

Yuwono, Y. S. 2015. Pengantar Petrogenesis. Bandung : ITB Press.




DOI: https://doi.org/10.37905/jrpi.v3i1.35897

Refbacks

  • There are currently no refbacks.


Copyright (c) Rinto Saputra Hamid, Yayu Indriati Arifin, Noviar Akase

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.