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Geochemical Study of Detrital Apatite in Sediment from the Southern Okinawa Trough: New Insights into Sediment Provenance

by Siyi Hu 1,2, Zhigang Zeng 1,2,3,*, Xue Fang 1,2, Haiyan Qi 1, Xuebo Yin 1, Zuxing Chen 1, Xiaohui Li 1 and Bowen Zhu 1,2
1
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(10), 619; https://doi.org/10.3390/min9100619
Received: 3 August 2019 / Revised: 22 September 2019 / Accepted: 30 September 2019 / Published: 8 October 2019
(This article belongs to the Section Mineral Geochemistry and Geochronology)
Detrital apatite is a promising accessory mineral for reliable fingerprinting of the protolith composition of detrital sediment. Here, we present the geochemical compositions of detrital apatites from four sections of a high-resolution (~140 cm/kyr) sedimentary archive from the southern Okinawa Trough (SOT) for constraining sediment source rock types and establishing changes in provenance. A series of diagrams based on the geochemical data show that apatites in Section 1 derived mainly from mafic/intermediate rocks, while apatites in the three younger sections largely originated from mafic/intermediate rocks and acid rocks. Further, the four sections included a few contributions of apatites from alkaline rocks and metamorphic rocks. Through a comprehensive analysis of controlling factors and regional stratigraphy in the study area, we concluded that sediments in the SOT are the weathering/erosion products of sedimentary and meta-sedimentary rocks in the western and northeastern Taiwan Island, with ultimate sources containing a wide variety of rock types. The sediment from rivers in eastern Taiwan did not significantly contribute to deposition in the SOT. Apatites in Sections 2–4 showed strong geochemical similarity but differed from those in Section 1, indicating that the types of weathered/eroded sedimentary rocks in the weathering profile of river drainage basins of Taiwan Island changed in Section 2 (2010–1940 cal. yr BP) and have remained stable since then. View Full-Text
Keywords: detrital apatite; sediment provenance; geochemical composition; the southern Okinawa Trough detrital apatite; sediment provenance; geochemical composition; the southern Okinawa Trough
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Hu, S.; Zeng, Z.; Fang, X.; Qi, H.; Yin, X.; Chen, Z.; Li, X.; Zhu, B. Geochemical Study of Detrital Apatite in Sediment from the Southern Okinawa Trough: New Insights into Sediment Provenance. Minerals 2019, 9, 619.

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