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学科主题: Geology
题名: Platinum group elements (PGE) and Os isotopic geochemistry of ferromanganese crusts from Pacific Ocean seamounts and their constraints on genesis.
作者: Sun, ZM ; Xue, T ; He, GW ; Zhang, M ; Shi, GY ; Wang, SW ; Lu, HF
通讯作者: eessmx@mail.sysu.edu.cn
关键词: platinum group elements( PGE) geochemistry ; Os isotopic composition ; ferromanganese crusts ; polymetallic nodules ; seamounts in central and west Pacific Ocean
刊名: ACTA PETROLOGICA SINICA
发表日期: 2006
卷: 22, 期:12, 页:3014-3026
收录类别: sci
部门归属: Sun Yat Sen Univ, Dept Earth Sci, Guangzhou 510275, Peoples R China; Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510640, Peoples R China; Minist Land & Resoures, Guangzhou Marine Geol Survey, Guangzhou 510760, Peoples R China
项目归属: 海洋地质
摘要: Platinum group elements (PGE), An contents and Os isotopic compositions in ferromanganese crusts and their basaltic substrates from the central and west Pacific Ocean were analyzed. The results show that their PGE and Au contents are quite high and greatly varied, the Sigma PGE is (70. 09 similar to 629.26) x 10(-9) and the total An is (0.60 similar to 26900) x 10-9 respectively. In the three-layered ( outer, porous and compact layers) crusts, the Sigma PGE contents of porous ((339.37 similar to 545. 82 x 10(-9)) and compact ((280.09 similar to 629.26) x 10(-9)) layers are significantly higher than the outer ((70.09 similar to 133.27) x 10(-9) layers. The single-layered crusts are also enriched in PGE(Sigma PGE = (83. 94 similar to 479.75) x 10(-9)), and their Au contents are usually higher than the three-layered ones. In addation, Sigma PGE and An contents of ferromanganese crusts are much higher than that in the nodules (Sigma PGE = (101.57 similar to 155. 83) x 10(-9), An = (1 - 4) x 10(-9)). Different sedimentary water depths and oxygen fugacity of the ambient. sea water of the crust and nodules may be the major reason for their different PGE and An contents. Sigma PCE and Pt are positively correlated with Mn % but inversely correlated with Fe %, which is just contrary to that in nodules, suggesting that PGE in the crusts may mainly occur in manganese mineral phases such as vernadites (8-MnO2), while the PGE in the nodules may predominantly occur in iron mineral phases such as goethites (FeOOH - nH(2)O) - Chondrite-normalized patters and various geochemical parameters of PGE demonstrate that PGE and An in the ferromanganese crusts were sourced from water/rock reaction between the basaltic substrates and seawater, and partly from extraterrestrial materials such as iron meteorite dusts, but not related to submarine hydrothermal venting. Calculation based on cobalt contents show that ferromanganese crusts in the west Pacific Ocean began to grow at about 42. 5Ma, and underwent two growth hiatuses corresponding to the geological ages of 21. 8Ma and 8. OMa respectively. The growth rates of the outer, porous and compact layers are 2.64mm/Ma, 1. 45mm/Ma and 1.06mm/Ma, and the (187)s/Os-188 of the corresponding ambient sea water are 0. 948 0. 953, 0.599 similar to 0. 673 and 0. 425 similar to 0. 536 separately, implying that the outer layers contained more continental eroded dusts, while the sediments in the porous and compact layers were mainly sourced from submarine basalt alteration and extraterrestrial materials such as interplanetary dust particles (IDPs).
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WOS记录号: WOS:000245660400017
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4358
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Sun, ZM; Xue, T; He, GW; Zhang, M; Shi, GY; Wang, SW; Lu, HF.Platinum group elements (PGE) and Os isotopic geochemistry of ferromanganese crusts from Pacific Ocean seamounts and their constraints on genesis.,ACTA PETROLOGICA SINICA,2006,22(12):3014-3026
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