| 泰国湾西部表层沉积物自生矿物分布及组成 |
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| 引用本文： | 王昆山,石学法,乔淑卿,KORNKANITNAN Narumol,KHOKIATTIWONG Somkiat.泰国湾西部表层沉积物自生矿物分布及组成[J].海洋学报(英文版),2015,34(12):125-136. |
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| 作者姓名： | 王昆山 石学法 乔淑卿 KORNKANITNAN Narumol KHOKIATTIWONG Somkiat |
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| 作者单位： | 国家海洋局第一海洋研究所海洋沉积与环境地质国家海洋局重点实验室, 山东青岛 266061, 中国;海洋地质过程与环境功能实验室海洋国家实验室, 山东青岛 266061, 中国,国家海洋局第一海洋研究所海洋沉积与环境地质国家海洋局重点实验室, 山东青岛 266061, 中国;海洋地质过程与环境功能实验室海洋国家实验室, 山东青岛 266061, 中国,国家海洋局第一海洋研究所海洋沉积与环境地质国家海洋局重点实验室, 山东青岛 266061, 中国;海洋地质过程与环境功能实验室海洋国家实验室, 山东青岛 266061, 中国,Marine and Coastal Resource Research Center, Samut Sakhon Province 74000, Thail,Phuket Marine Biological Center, Muaeng Phuket 83000, Thailand |
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| 基金项目： | The National Programme on Global Change and Air-sea Interaction under contract No. GASI-02-SCS-CJ03; China Geological Survey:Continental Shelf Drilling Program under contract No. GZH201100202; China-Thailand Cooperation Project "Research on Vulnerability of Coastal Zones". |
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| 摘 要： | Generation, morphology, and distribution of authigenic minerals directly reflect sedimentary environment and material sources. Surface sediments were collected from the western Gulf of Thailand during 2011–2012, and 159 samples were analyzed to determine detrital minerals. Authigenic minerals, including siderite, pyrite, and glauconite, are abundant whereas secondary minerals, such as chlorite and limonite, are distributed widely in the study area. Siderite has a maximum content of 19.98 g/kg and appears in three types from nearshore to continental shelf, showing the process of forming-maturity-oxidation. In this process, the Mn O content in siderite decreases, but Fe_2O_3 and Mg O content increase. Colorless or transparent siderite pellets are fresh grains generated within a short time and widely distributed throughout the region; high content appears in coastal area where river inputs are discharged. Translucent cemented double pellets appearing light yellow to red are mature grains; high content is observed in the central shelf. Red-brown opaque granular pellets are oxidized grains,which are concentrated in the eastern gulf. Pyrite is mostly distributed in the central continental shelf with an approximately north–south strip. Pyrite are mainly observed in foraminifera shell and distributed in clayey silt sediments, which is similar to that in the Yangtze River mouth and the Yellow Sea. The pyrite in the gulf is deduced from genetic types associated with sulfate reduction and organic matter decomposition. Majority of glauconite are granular with few laminar. Glauconite is concentrated in the northern and southern parts within the boundary of 9.5° to 10.5°N and is affected by river input diffusion. The distribution of glauconite is closely correlated with that of chlorite and plagioclase, indicating that glauconite is possibly derived from altered products of chlorite and plagioclase. The K_2O content of glauconite is low or absent, indicating its short formation time.
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| 关 键 词： | 泰国湾 表层沉积物 自生矿物 菱铁矿 海绿石 矿物组成 |
| 收稿时间： | 2014/8/19 0:00:00 |
| 修稿时间： | 4/1/2015 12:00:00 AM |
Distribution and composition of authigenic minerals in surface sediments of the western Gulf of Thailand |
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| WANG Kunshan,SHI Xuef,QIAO Shuqing,KORNKANITNAN Narumol and KHOKIATTIWONG Somkiat.Distribution and composition of authigenic minerals in surface sediments of the western Gulf of Thailand[J].Acta Oceanologica Sinica,2015,34(12):125-136. |
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| Authors: | WANG Kunshan SHI Xuef QIAO Shuqing KORNKANITNAN Narumol and KHOKIATTIWONG Somkiat |
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| Institution: | 1.Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Function Laboratory for Marine Geology, National Oceanography Laboratory, Qingdao 266061, China2.Marine and Coastal Resource Research Center, Samut Sakhon 74000, Thailand3.Phuket Marine Biological Center, Muaeng Phuket 83000, Thailand |
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| Abstract: | Generation, morphology, and distribution of authigenic minerals directly reflect sedimentary environment and material sources. Surface sediments were collected from the western Gulf of Thailand during 2011-2012, and 159 samples were analyzed to determine detrital minerals. Authigenic minerals, including siderite, pyrite, and glauconite, are abundant whereas secondary minerals, such as chlorite and limonite, are distributed widely in the study area. Siderite has a maximum content of 19.98 g/kg and appears in three types from nearshore to continental shelf, showing the process of forming-maturity-oxidation. In this process, the MnO content in siderite decreases, but Fe2O3 and MgO content increase. Colorless or transparent siderite pellets are fresh grains generated within a short time and widely distributed throughout the region; high content appears in coastal area where river inputs are discharged. Translucent cemented double pellets appearing light yellow to red are mature grains; high content is observed in the central shelf. Red-brown opaque granular pellets are oxidized grains, which are concentrated in the eastern gulf. Pyrite is mostly distributed in the central continental shelf with an approximately north-south strip. Pyrite are mainly observed in foraminifera shell and distributed in clayey silt sediments, which is similar to that in the Yangtze River mouth and the Yellow Sea. The pyrite in the gulf is deduced from genetic types associated with sulfate reduction and organic matter decomposition. Majority of glauconite are granular with few laminar. Glauconite is concentrated in the northern and southern parts within the boundary of 9.5° to 10.5°N and is affected by river input diffusion. The distribution of glauconite is closely correlated with that of chlorite and plagioclase, indicating that glauconite is possibly derived from altered products of chlorite and plagioclase. The K2O content of glauconite is low or absent, indicating its short formation time. |
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| Keywords: | Gulf of Thailand surface sediment authigenic minerals siderite glauconite composition of minerals |
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