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

Autor: Xue Fang, Xuebo Yin, Siyi Hu, Xiaohui Li, Zhigang Zeng, Bowen Zhu, Haiyan Qi, Zuxing Chen
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Minerals
Volume 9
Issue 10
Minerals, Vol 9, Iss 10, p 619 (2019)
ISSN: 2075-163X
DOI: 10.3390/min9100619
Popis: 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&ndash
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&ndash
1940 cal. yr BP) and have remained stable since then.
Databáze: OpenAIRE
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