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Middle Eocene Nannofossil Assemblages Responding to Depositional Dynamics of the Elat Formation, Maluku

JURNAL GEOCELEBES · Vol. 7 No. 2 (2023) · hlm. 138–153

DOI
10.20956/geocelebes.v7i2.25371
ISSN
2579-5546, 2579-5821
Terbit
2023-11-02
Penerbit
Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar
Bahasa
en

Abstrak

The Kei Besar Island is mainly composed of the Elat Formation carbonate rocks. This research was conducted to determine the nannofossils assemblages in the Elat Formation to interpret the depositional dynamics during its formation. Lithological observations and sampling for nannofossil analysis were carried out on three measured stratigraphic sections: Section 1 - Hollat, Section 2 - Ngurdu, and Section 3 - Mata Hollat. A total of 47 species assigned to 25 genera of nannofossils were identified in 45 selected samples. The succession of the Elat Formation in the study area formed at NP16 to N17 or Middle Eocene. Stratigraphic reconstruction supported by biostratigraphy analysis shows that Section 3 at the lower (NP16 to NP 17), Section 2 in the middle part (NP 17), and Section 1 at the upper (NP 17). R-mode cluster analysis of nannofossils defined four species clusters (assemblies A, B, C and D) that tend to occur together. Q-mode cluster analysis defined five depth-distribution clusters (1, 2, 3, 4, and 5), each deposited under similar conditions. Based on large foraminifera, the succession was formed in fore reef setting in neritic bathymetric zone. Coarsening and thickening upward supported by the nannofossil assemblages indicate depositional dynamics which tend to be shallower. Reworked fossils, commonly found at the lower of the Elat Formation, show the mechanism of turbid currents in early deposition.

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  • Padjadjaran University
  • Chaoyang University of Technology
  • Bandung Institute of Technology
  • National Research and Innovation Agency
  • Pertamina (Indonesia)
  • Rumah Sakit Umum Pusat Nasional Dr. Cipto Mangunkusumo
  • Universitas Sumatera Utara
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Rekan penulisOrganisasiArtikel bersama
Emi SukiyahPadjadjaran University3
Adjat SudradjatPadjadjaran University2
Ival Umar SayafPadjadjaran University2
Wingky SugandaPertamina (Indonesia)2
Martha Magdalena NanlohyPadjadjaran University1
Fery ErawanAfiliasi tidak diketahui1
Prana Ugiana GioUniversitas Sumatera Utara1
Rezzy Eko CarakaChaoyang University of Technology1
Anjar Dimara SaktiBandung Institute of Technology1
Bens PardameanBinus University1
Muhammad Khahfi ZuhandaMedan Area University1
Yudo AnggoroBandung Institute of Technology1
Khairunnisa SupardiRumah Sakit Umum Pusat Nasional Dr. Cipto Mangunkusumo1
Rung Ching ChenChaoyang University of Technology1
Noor Ell GoldameirAfiliasi tidak diketahui1
Avia Enggar TyastiPoliteknik APP Jakarta1
Rumanintya Lisaria PutriNational Research and Innovation Agency1
Amos LukasNational Research and Innovation Agency1
Rishan AdhaUniversity of Mataram1
Pahrudin PahrudinUniversitas Hamzanwadi1
Fahmi Ali HudaefiUniversitas Islam Darussalam1
Winantris WinantrisAfiliasi tidak diketahui1
Tety SyahrulyatiPadjadjaran University1
Mega F RosanaPadjadjaran University1

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Sumber metadata: OAI-PMH (metadata jurnal) https://journal.unhas.ac.id/index.php/geocelebes/oai, pertama di-harvest 3 Nov 2026, terakhir terlihat 8 Nov 2026.
Metadata asli (oai_dc) 
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	<dc:title xml:lang="en">Middle Eocene Nannofossil Assemblages Responding to Depositional Dynamics of the Elat Formation, Maluku</dc:title>
	<dc:creator xml:lang="en">Ratumanan, Ratih C. F.</dc:creator>
	<dc:creator xml:lang="en">Isnaniawardhani, Vijaya</dc:creator>
	<dc:creator xml:lang="en">Muljana, Budi</dc:creator>
	<dc:subject xml:lang="en">depositional environment</dc:subject>
	<dc:subject xml:lang="en">Kei Besar</dc:subject>
	<dc:subject xml:lang="en">Middle Eocene</dc:subject>
	<dc:subject xml:lang="en">nannofossil</dc:subject>
	<dc:description xml:lang="en">The Kei Besar Island is mainly composed of the Elat Formation carbonate rocks. This research was conducted to determine the nannofossils assemblages in the Elat Formation to interpret the depositional dynamics during its formation. Lithological observations and sampling for nannofossil analysis were carried out on three measured stratigraphic sections: Section 1 - Hollat, Section 2 - Ngurdu, and Section 3 - Mata Hollat. A total of 47 species assigned to 25 genera of nannofossils were identified in 45 selected samples. The succession of the Elat Formation in the study area formed at NP16 to N17 or Middle Eocene. Stratigraphic reconstruction supported by biostratigraphy analysis shows that Section 3 at the lower (NP16 to NP 17), Section 2 in the middle part (NP 17), and Section 1 at the upper (NP 17). R-mode cluster analysis of nannofossils defined four species clusters (assemblies A, B, C and D) that tend to occur together. Q-mode cluster analysis defined five depth-distribution clusters (1, 2, 3, 4, and 5), each deposited under similar conditions. Based on large foraminifera, the succession was formed in fore reef setting in neritic bathymetric zone. Coarsening and thickening upward supported by the nannofossil assemblages indicate depositional dynamics which tend to be shallower. Reworked fossils, commonly found at the lower of the Elat Formation, show the mechanism of turbid currents in early deposition.</dc:description>
	<dc:publisher xml:lang="en">Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar</dc:publisher>
	<dc:date>2023-11-02</dc:date>
	<dc:type>info:eu-repo/semantics/article</dc:type>
	<dc:type>info:eu-repo/semantics/publishedVersion</dc:type>
	<dc:type xml:lang="en">Peer-reviewed Article</dc:type>
	<dc:format>application/pdf</dc:format>
	<dc:identifier>https://journal.unhas.ac.id/index.php/geocelebes/article/view/25371</dc:identifier>
	<dc:identifier>10.20956/geocelebes.v7i2.25371</dc:identifier>
	<dc:source xml:lang="en">JURNAL GEOCELEBES; Vol. 7 No. 2: October 2023; 138–153</dc:source>
	<dc:source>2579-5546</dc:source>
	<dc:source>2579-5821</dc:source>
	<dc:language>en</dc:language>
	<dc:relation>https://journal.unhas.ac.id/index.php/geocelebes/article/view/25371/10409</dc:relation>
	<dc:rights xml:lang="en">Copyright (c) 2023 JURNAL GEOCELEBES</dc:rights>
</oai_dc:dc>