Geochemical constraints on CO<sub>2</sub>-rich mantle source for the Kocebu Seamount, Magellan Seamount chain in the western Pacific

Yuhao LIU; Guoliang ZHANG; Ji ZHANG; Shuai WANG

doi:10.1007/s00343-020-0013-x

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Geochemical constraints on CO₂-rich mantle source for the Kocebu Seamount, Magellan Seamount chain in the western Pacific

Geology | Updated：2023-04-27

- Geochemical constraints on CO₂-rich mantle source for the Kocebu Seamount, Magellan Seamount chain in the western Pacific
- Journal of Oceanology and Limnology Vol. 38, Issue 4, Pages: 1201-1214(2020)
- Affiliations：
  
  1.Center of Deep Sea Research & Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266000, China
  3.University of Chinese Academy of Sciences, Beijing 100049, China
  4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
- Author bio：
  
  ZHANG Guoliang, zhangguoliang@qdio.ac.cn
- Funds：
- DOI：10.1007/s00343-020-0013-x
  CLC：
- Received：15 January 2020，
  
  Accepted：24 February 2020，
  
  Online First：10 April 2020，
  
  Published：2020-07
- Accepted：
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Yuhao LIU, Guoliang ZHANG, Ji ZHANG, et al. Geochemical constraints on CO₂-rich mantle source for the Kocebu Seamount, Magellan Seamount chain in the western Pacific[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1201-1214.
DOI：

Yuhao LIU, Guoliang ZHANG, Ji ZHANG, et al. Geochemical constraints on CO₂-rich mantle source for the Kocebu Seamount, Magellan Seamount chain in the western Pacific[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1201-1214. DOI： 10.1007/s00343-020-0013-x.

摘要

Abstract

The alkaline oceanic island basalts (OIBs) with under-saturated SiO

and high contents of CaO and alkaline are usually attributed to mantle sources different from typical tholeiitic OIBs. Based on the results of high pressure and temperature experiment study

the genesis of silica under-saturated alkaline basaltic melts could be explained by the role of CO

thus

the genetic relationship of alkaline basalts with CO

has become a topic of relevance because it is closely related to the deep carbon cycle. The Magellan Seamount chain in the West Pacific Seamount Province has wide distribution of alkali basalts. For the first time

we collected alkaline basalt samples from the Kocebu Seamount of the Magellan Seamount chain and found that magmatic apatites widely occur in the less evolved volcanic rock samples

and the high contents of phosphorus should be a feature of the alkaline OIBs of the Magellan Seamounts. Compared with typical OIBs

these alkaline volcanic rocks have higher CaO and P

lower SiO

content

negative anomaly of high field strength elements (HFSEs)

more distinctly negative anomaly of potassium (K) and the ubiquity of titanaugite

indicating a CO

-rich mantle source. Based on the relatively high K

O and TiO

contents and La/Yb ratio and low MgO content of these alkaline rocks

we suggest that the volcanic rocks of the Magellan Seamounts are originated from carbonated eclogites derived possibly from ancient subducted altered oceanic crust.

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⁰

Geochemical constraints on CO2-rich mantle source for the Kocebu Seamount, Magellan Seamount chain in the western Pacific

DOI：10.1007/s00343-020-0013-x

摘要

Abstract

关键词

Keywords

references

Geochemical constraints on CO₂-rich mantle source for the Kocebu Seamount, Magellan Seamount chain in the western Pacific