| 琉球群岛以东海区沉积物重矿物分布及来源 |
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| 引用本文： | 王昆山,石学法,鄢全树,方习生,蔡善武.琉球群岛以东海区沉积物重矿物分布及来源[J].海洋地质与第四纪地质,2008,28(5). |
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| 作者姓名： | 王昆山 石学法 鄢全树 方习生 蔡善武 |
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| 作者单位： | 1. 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,青岛,266061
2. 深圳博伦职业技术学校,深圳,518052 |
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| 基金项目： | 国家自然科学基金重点项目
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国家自然科学基金
，
基本科研业务费专项资金资助项目
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| 摘 要： | 琉球群岛东部海区沉积物中富含大量火山碎屑矿物、岛屿岩石遭受风化蚀变形成的普通角闪石以及水生的铁锰微结核,其重矿物种类、特征、组合分区等与火山作用、沉积环境、地形、物质来源等内外生因素密切相关。通过对本区重矿物的种类、特征及组合分区的研究,初步判断位于研究区北部、菲律宾板块向欧亚大陆俯冲而导致的正在活动的的琉球岛弧区为火山碎屑的主要源区,重矿物成分主要为水携成因来源,受同期火山作用控制;少量紫苏辉石来自先期形成的海岭或海底高原(如冲大东海岭、奄美海岭及九州海岭等)上的火山岩系,是经过剥蚀、搬运再沉积的产物;琉球群岛、九州等火山活动产物受海底高地等阻隔而在本区表现为向南或东南影响力逐渐减小;本区地质历史上的及正在进行的岩浆活动主要以基性及中性岩浆为主。此外,流经本区的黑潮对自生铁锰微结核的富集具有重要影响。
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| 关 键 词： | 沉积物 重矿物 火山碎屑 火山作用 琉球群岛 |
DISTRIBUTION AND SOURCES OF HEAVY MINERALS IN SURFACE SEDIMENTS IN THE SEA AREA EAST OF THE RYUKYU ISLANDS |
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| WANG Kun-shan,SHI Xue-fa,YAN Quan-shu,FANG Xi-sheng,CAI Shan-wu.DISTRIBUTION AND SOURCES OF HEAVY MINERALS IN SURFACE SEDIMENTS IN THE SEA AREA EAST OF THE RYUKYU ISLANDS[J].Marine Geology & Quaternary Geology,2008,28(5). |
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| Authors: | WANG Kun-shan SHI Xue-fa YAN Quan-shu FANG Xi-sheng CAI Shan-wu |
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| Abstract: | Sediments distributed over the area east of Ryukyu Islands are enriched in volcaniclastic minerals,hornblende and Fe-Mn micro-nodules.Types,characteristics and provinces of heavy minerals are closely related to some endogenetic and exogenous factors,suah as volcanism,sedimentary environment,relief and material provenance.Based on the study of types,characteristics and provinces of heavy minerals,it is preliminarily inferred that the ongoing volcaniclastic material is from Ryukyu Islands arc,which is created by the subduction of Philippine plate beneath Eurasian plate;water is the main transportation mean for heavy minerals,the abundance of which is strongly controlled by contemporaneous volcanism.Low-abundance hypersthene originates from volcanic rocks on adjacent ridges or seafloor plateaus such as Oki--Daito ridge,Amami ridge and Kyushu-Palau ridge,which experienced a series of processes such alteration,transportation and re-sedimentation.The abundance of volcaniclastic materials from Ryukyu Islands shows a decreasing trend southwards or southeastwards due to the obduction of seafloor plateaus;ongoing magmatism or volcanic activity in geologic time is mainly represented by basic-intermediate magmatism.In addition,Kuroshio plays a significant role in the enrichment of Fe-Mn micro-nodules. |
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| Keywords: | sediments heavy minerals volcanic clast volcanism Ryukyu Islands |
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