NDLI: Major and trace element composition of surface sediments from the Southwest Indian Ridge: evidence for the incorporation of a hydrothermal component

Content Provider	Springer Nature Link
Author	Li, Zhenggang Chu, Fengyou Jin, Lu Li, Xiaohu Dong, Yanhui Chen, Ling Zhu, Jihao
Copyright Year	2016
Abstract	Hydrothermal materials in deep-sea sediments provide a robust tracer to the localized hydrothermal activity at mid-ocean ridges. Major, trace and rare earth element (REE) data for surface sediments collected from the ultraslow spreading Southwest Indian Ridge are presented to examine the existence of hydrothermal component. Biogenic carbonate oozes dominate all the sediment samples, with CaO content varying from 85.5% to 89.9% on a volatile-free basis. The leaching residue of bulk sediments by ~5% HCl is compositionally comparable to the Upper Continental Crust (UCC) in SiO$_{2}$, Al$_{2}$O$_{3}$, CaO, MgO, alkali elements (Rb, Cs) and high field strength elements (Nb, Ta, Zr, Hf, Ti). These detritus-hosted elements are inferred to be prominently derived from the Australian continent by means of eolian dust, while the contribution of local volcaniclastics is insignificant. In addition, the residual fraction shows a clear enrichment in Fe, Mn, and Ba compared with the UCC. Combining the positive Eu anomaly of residual fraction which is opposed to the UCC but the characteristic of hydrothermal fluids and associated precipitates occurred at mid-ocean ridges, the incorporation of localized hydrothermal component can be constrained. REE mixing calculations indicate that more than half REE within the residual fraction (~55%–60%) are derived from a hydrothermal component, which is inferred to be resulted from a diffuse fluid mineralization. The low-temperature diffuse flow may be widely distributed along the slow-ultraslow spreading ridges where crustal faults and fissures abound, and probably have a great mineralization potential.
Starting Page	101
Ending Page	108
Page Count	8
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	35
Issue Number	2
e-ISSN	18691099
Language	English
Publisher	The Chinese Society of Oceanography
Publisher Date	2016-02-24
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	deep-sea sediments hydrothermal component diffuse fluid eolian dust Southwest Indian Ridge Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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