Characteristics of platinum-group elements in Mariana Trough basalts

CAO Zhi-min; AN Wei; ZHOU Mei-fu; ZHENG Jian-bin; QI Liang

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CAO Zhi-min, AN Wei, ZHOU Mei-fu, ZHENG Jian-bin, QI Liang. Characteristics of platinum-group elements in Mariana Trough basalts[J]. Haiyang Xuebao, 2006, 28(5): 69-75.

Citation:

CAO Zhi-min, AN Wei, ZHOU Mei-fu, ZHENG Jian-bin, QI Liang. Characteristics of platinum-group elements in Mariana Trough basalts[J]. Haiyang Xuebao, 2006, 28(5): 69-75.

CAO Zhi-min, AN Wei, ZHOU Mei-fu, ZHENG Jian-bin, QI Liang. Characteristics of platinum-group elements in Mariana Trough basalts[J]. Haiyang Xuebao, 2006, 28(5): 69-75.

Citation:

CAO Zhi-min, AN Wei, ZHOU Mei-fu, ZHENG Jian-bin, QI Liang. Characteristics of platinum-group elements in Mariana Trough basalts[J]. Haiyang Xuebao, 2006, 28(5): 69-75.

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Characteristics of platinum-group elements in Mariana Trough basalts

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266003, China
2.
China Offshow Environmental Sevice Ltd, Tanggu 300452, China
3.
Department of Earth Sciences, University of Hong Kong, Hong Kong, 999077, China

Received Date: 2005-05-01
Rev Recd Date: 2006-04-26

Abstract

Abstract

Total platinum-group elements concentrations (ΣPGE) from Mariana Trough basalts ranged from 0.418 to 1.022 ng/g, and primitive mantle-normalized PGE concentration patterns are of positive slope with a clear Ptnegative anomaly (Pt/Pt^* = 0.01~0.15),showing the relative enrichment of PPGE and Au relative to IPGE.Compared with other mantleoriginated rocks, Mariana Trough basalts have lower PGE contents and wider ranges of (Pd/Ir) N, (Pd/Pt) N, (Pd/Ru) N.On the other hand, Mariana Trough basalts exhibited a relative Pt and Ir depletion.Characteristics of PGE patterns indicated that the studied Mariana Trough basalts were originated from low partial melting, and the MORB mantle beneath the spreading center had been contaminated byarcisland mantle.In the aspect of trace elements, Mariana Trough basalts showed the enrichment of LILE, Pb and LREE, indicating that they had been influenced by subduction compositions.All these demonstrated that Mariana Trough basalts are products of partial melting from amixed mantle (the contamination of MORB mantle by are-island mantle).
- Back-arc basin basalt,
- platinum-group elements,
- negative Pt anomaly,
- subduction zone

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References(33)

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