The nature and provenance of Golestan loess deposits in northeast Iran

被引：35

作者：

Asadi, Sina ^{[1
]}

Moore, Farid ^{[1
]}

Keshavarzi, Behnam ^{[1
]}

机构：

[1] Shiraz Univ, Coll Sci, Dept Earth Sci, Shiraz, Iran

来源：

GEOLOGICAL JOURNAL | 2013年 / 48卷 / 06期

关键词：

loess deposits; felsic source rock; Chemical Index of Alteration (CIA); Golestan province; Iran; QUARTZ GRAINS; SURFACE TEXTURES; GLACIAL LOESS; GEOCHEMISTRY; DESERT; CLIMATE; CLAY; SEDIMENTATION; CHINA; ROCKS;

D O I：

10.1002/gj.2466

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Mineralogical, textural, geochemical, and weathering characteristics of loess deposits in Golestan province of Iran suggest that they are mostly derived from felsic igneous rocks and are related to Quaternary palaeoclimate. Whole-rock analyses indicate heavy minerals such as zircon, tourmaline and phyllosillicate minerals (e.g. muscovite, chlorite, illite) exert a significant control on the chemical composition. The loess samples display uniform chemical composition, indicative of similar alteration history. Chemical index of alteration suggests a weak to moderate degree of weathering in a felsic source area. Scanning electron micrographs of quartz grains reveal abundant silt-sized quartz particles, a result of glacial grinding during the Late Pleistocene in Central Asia. Subsequently, these silt particles were transported from Central Asia to their depositional site by wind and paraglacial processes. Local topography of northeast Iran (Alborz Mountains) acted as a major barrier, entrapping the airborne particles on the plains of Golestan province. Copyright (c) 2012 John Wiley & Sons, Ltd.

引用

页码：646 / 660

页数：15

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