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Journal : Journal of Geoscience, Engineering, Environment, and Technology

Geochemistry of Igneous Rocks of Citirem Formation and Its Implications for the Tectonic Setting in Ciletuh – Palabuhanratu UNESCO Global Geopark Area Hafidhah Nurul Haq; Rosana, Mega Fatimah; Endyana, Cipta; Nugraha, Katon Sena Ajie; Alamsyah, Irpan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 1 (2024): JGEET Vol 09 No 01 : March (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.1.14367

Abstract

The igneous rocks of the Citirem Formation in the Ciletuh – Palabuhanratu UNESCO Global Geopark area petrographically not only consist of basalt, but also andesite, dacite, and gabbro. The characteristics of basalts Citirem Formation are composed of plagioclase 43% – 58% and olivine, mostly have amygdaloidal and aphanitic textures. Andesites are composed of 45% – 65% plagioclase, absence of olivine, mostly aphanitic and trachytic, some have intergranular textures. Dacite comprises 50% plagioclase, 20% quartz, and the absence of olivine, and aphanitic, intersertal textures. Gabbros are composed of 62% plagioclase, 6% – 12% olivine, with phaneritic texture. Based on the plot of the major elements vs SiO2 diagram, MgO, FeOt (Fe2O3+FeO), CaO, and TiO2 show a negative correlation with SiO2. In comparison, Na2O and K2O show a positive correlation with SiO2. The lithology of igneous rocks of Citirem Formation are basalt, trachybasalt, basaltic trachyandesite, trachyandesite, andesite, dacite and gabbro based on a plot of the Na2O+K2O vs SiO2 diagram for volcanic and plutonic rocks. The origin of magma type can be distinguished based on the plot of K2O vs SiO2 diagrams, the igneous rocks of Citirem Formation are divided into low-K, medium-K, high-K, and shoshonite magma series. Dacite STA 2, andesite STA 7, basaltic andesite STA 8, trachyandesite STA 10 and gabbro STA 14 are calc-alkaline based on triangular diagram Th-Hf-Ta-Zr-Nb. Gabbro STA 17 indicates IAT (island arc tholeiite), trachybasalt STA 19, basalt STA 20 and basaltic trachyandesite STA 27 are E-MORB, WPT (within plate tholeiitic), In contrast, trachybasalt STA 28 is WPA (within plate alkali). Primitive mantle long, NMORB-normalized REE patterns and chondrites-normalized show some rocks have distinctive patterns that have similarities with suprasubduction zone ophiolite rocks, MORB of Mirdita ophiolite, and some show similarities with patterns from OIB and E-MORB.
Co-Authors Achmad Rizal Agustina Eka Putri Ahmad Fudholi Ajeng Ramadhita Larasati Ajeng Ramadhita Larasati Akhmad Kusuma Wardhana Alamsyah, Irpan Alexander M. A. Khan Alexander M. A. Khan Alexander M.A.Khan Alexander Muhammad Akbar Andis Priswantoro Anggoro Tri Mursito Annisa, Sekar Dinda Aping Firman Juliansyah Ar-rouf, Ferdian Budi Asep Mulyana Asep Yusuf Baitulloh, Taqiy Gusdi Boy Macklin Pareira Prawiranegara Dadang Suganda Delamontano, Eldo Denny Lumban Raja Dicky Muslim Eldo Delamontano Elnovani Lusiana Emi Sukiyah Emma Rochima Evi Novianti Evi Novianti Evi Novianti Fauzan, Aldo Febri Hirnawan Febri Hirnawan Fiverno, David Feby Hafidhah Nurul Haq Hanny Hafiar Harahap, Ulfah Azzahra Hartifiany Praisra Hendarmawan, . Hendrawan Hendrawan Hendrawan Hendrawan Jauhari, Regitha Johanes Hutabarat Kholidil Amin Laksmana, Tb.Adinda Larasati, Ajeng Ramadhita Lumongga, Az Zahra M. Liga Suryadana Mega Fatimah Rosana Mohamad Sapari Hadian Mudiyati Rahmatunnisa Muhammad, Azwar Satrya Mulan, Kencan Nana Sulaksana Nana Sulaksana Nugraha, Katon Sena Ajie Nurida Maulidia Rahma Pamungkas, Kasno Praisra, Hartifiany Prastowo , Ari Agung Priswantoro, Andis Andis Putra, Adhika Graha Irianto Putra, Rieza Rachmat Putraarta Samodro R. Hendro S. Arlianto Rachmat, Heryadi Rahmatika Desiana Rianto, Yan Rika Wulandari Sambodo, Tri Hananto Sentosa*, Millati Amalia Sulaksana, Nana Nana Tri Mursito, Anggoro Anggoro Undang Mardiana Ute Lies Siti Khadijah Wandani, Diki Wulung, Shandra Rama Panji Yan Rianto Yunus Winoto Yunus Winoto