极地研究

极地研究

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北冰洋西部表层沉积物重矿物特征

王昆山 刘焱光 董林森 陈志华   

  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，山东青岛266061
  • 出版日期:2014-03-30 发布日期:2014-03-30

CHARACTERISTICS OF HEAVY MINERALS IN THE SURFACE SEDIMENTS OF THE WESTERN ARCTIC OCEAN

Wang Kunshan,  Liu Yangang, Dong Linsen, Chen Zhihua   

  1. First Institute of Oceanography, Key Laboratory of Marine Sedimentology and Environmental Geology, SOA, Qingdao 266061, China
  • Online:2014-03-30 Published:2014-03-30

PDF (PC)

1409

被引次数

4

摘要： 对中国第1 次( 1999 年) 和第2 次( 2003 年) 北极科学考察在楚科奇海及邻近的北冰洋深水区采取的47站表层沉积物进行了碎屑重矿物鉴定分析。结果表明北冰洋西部表层沉积物中重矿物以抗风化能力较弱的绿帘石、紫苏辉石和普通角闪石为优势矿物，钛铁矿、石榴子石、磷灰石和赤铁矿为特征矿物。矿物组合分区表明研究区物质来源和水动力变化较为复杂：白令海峡以南沉积物中重矿物含量高，水动力强；白令海峡以北的洋流变化与所经区域沉积物重矿物种类和含量变化相一致，即楚科奇海中部沉积物富集紫苏辉石、钛铁矿和石榴子石，物质来源可能与楚科奇山原相关，而在阿拉斯加沿岸沉积物中富集绿帘石和紫苏辉石，与阿拉斯加沿岸流携带物质相关；楚科奇海北部深水区碎屑矿物沉积速率低且矿物多有蚀变。

关键词: 沉积物, 重矿物, 北冰洋西部, 楚科奇海, 洋流

Abstract:   The composition, assemblage and distribution characteristics of heavy minerals in 47 surface sediments of the Chukchi Sea and adjacent Arctic Ocean deep water were identified. The sediments were collected during the first and second Chinese national Arctic scientific expedition in 1999 and 2003. The results show that heavy minerals in surface sediments of western Arctic Ocean are mainly composed of epidote, hypersthene and hornblende with low resistance to weathering; ilmenite, garnet,apatite and hematite are characteristic minerals. Mineral assemblages and distribution indicate that material sources and hydrodynamic conditions in the study area are complicated: the content of heavy minerals in south of the Bering Strait is higher, indicating strong hydrodynamic action; in the central Chukchi Sea sediments enriched hypersthene, ilmenite and garnet, there sources may be Chukchi plateau, while in Alaska coastal sediments enriched in epidote and hypersthene may related with Alaska coastal current; clastic mineral deposition rate in northern Chukchi Sea deepwater is low and there are many mineral alteration.

Key words: sediment, heavy minerals, western Arctic Ocean, Chukchi Sea, currents