Arid
DOI10.1007/s12303-012-0014-7
Sedimentological, geochemical and geomorphological factors in formation of coastal dunes and nebkha fields in Miankaleh coastal barrier system (Southeast of Caspian Sea, North Iran)
Amini, Arash1; Moussavi-Harami, Reza1; Lahijani, Hamid2; Mahboubi, Asaddollah1
通讯作者Amini, Arash
来源期刊GEOSCIENCES JOURNAL
ISSN1226-4806
EISSN1598-7477
出版年2012
卷号16期号:2页码:139-152
英文摘要

Miankaleh coastal barrier system has about 71 km length with an average of 3 km width in southeast of Caspian Sea. Forty sandy samples, collected from 5 coastal dune zones, in Miankaleh were analyzed compositionally, texturally and chemically and 31 samples from 4 nebkha field zones were analyzed for textural and geomorphological interpretation. Samples from stoss and lee sides of coastal dunes and nebkha dune field are mainly composed of medium to fine grains of sand that are well sorted, fine skewed and leptokurtic. Modal analyses of coastal dune sands show that they comprise 61% quartz, 14.74% feldspar and 24.26% rock fragments. The chemical index of alteration (CIA) value in coastal dune samples is high because of relatively warm and humid climatic condition with high amount of feldspar and rock fragments. Sedimentary and plutonic rock fragments are more than the other lithic fragments in sand samples. Nekaroud is the main source of sediments supply and as move to the east, the amount of Fe2O3, TiO2, MgO and heavy minerals in coastal dune sands decreases. The changes of the ratios of Al2O3/Na2O and Rb/Sr can be used to evaluate the CIA value in the study area. High Zr value is another evidence of high zircon content and recycled sedimentary rocks in the source area. From west to the east, sand moving power index (M) decreases and active coastal dunes change to dormant coastal dunes. There is no coastal dune in the eastern and southern parts of the study area. Based on concentration, stabilization, height and biological cover, nebkha dune fields are classified into 4 zones. There is a meaningful relationship between different morphometrical parameters.


英文关键词coastal dunes nebkha dune fields textural analysis major and trace elements Miankaleh
类型Article
语种英语
国家Iran
收录类别SCI-E
WOS记录号WOS:000305664000004
WOS关键词SEDIMENTS ; PROVENANCE ; KALAHARI ; DESERT
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172614
作者单位1.Ferdowsi Univ Mashhad, Fac Sci, Dept Geol, Mashhad 917751163, Iran;
2.Iranian Natl Inst Oceanog, Tehran 1411813389, Iran
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GB/T 7714
Amini, Arash,Moussavi-Harami, Reza,Lahijani, Hamid,et al. Sedimentological, geochemical and geomorphological factors in formation of coastal dunes and nebkha fields in Miankaleh coastal barrier system (Southeast of Caspian Sea, North Iran)[J],2012,16(2):139-152.
APA Amini, Arash,Moussavi-Harami, Reza,Lahijani, Hamid,&Mahboubi, Asaddollah.(2012).Sedimentological, geochemical and geomorphological factors in formation of coastal dunes and nebkha fields in Miankaleh coastal barrier system (Southeast of Caspian Sea, North Iran).GEOSCIENCES JOURNAL,16(2),139-152.
MLA Amini, Arash,et al."Sedimentological, geochemical and geomorphological factors in formation of coastal dunes and nebkha fields in Miankaleh coastal barrier system (Southeast of Caspian Sea, North Iran)".GEOSCIENCES JOURNAL 16.2(2012):139-152.
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