Palaeoclimate, palaeosalinity and redox conditions control palygorskite claystone formation: an example from the Yangtaiwatan Basin, northwest China

IF 1.1 4区地球科学 Q4 CHEMISTRY, PHYSICAL

Clay Minerals Pub Date : 2021-09-01 DOI:10.1180/clm.2022.1

Lihui Liu, Shuai Zhang, Qinfu Liu, Linsong Liu, Youjun Deng

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引用次数: 4

Abstract

Abstract Palygorskite-bearing claystones and mudstones were deposited in a salt lake in the middle and lower parts of the Neogene Baiyanghe Formation in the Yangtaiwatan Basin, China. The petrological, mineralogical and geochemical characteristics of the sediments were investigated to determine the factors controlling palygorskite formation. The palygorskite claystones and mudstones have distinctly varying mineral compositions. The claystones are composed of detrital minerals, palygorskite and illite, whereas the mudstones consist mainly of mixed-layer illite/smectite and illite. The palygorskite crystals were intact with sharp edges and interwoven with other minerals, indicating an authigenic origin. The chemical characteristics indicate that the palygorskite claystones in the middle part of the Baiyanghe Formation were deposited in a salt lake environment in an arid and hot climate. As the salinity of the lake gradually increased, the detrital minerals such as quartz, feldspar, dolomite and detrital clay minerals dissolved in the alkaline medium, thus providing Si4+, Mg2+ and Al3+ for the crystallization of palygorskite. The palygorskite coexists with certain amounts of detrital quartz and feldspar with limited roundness and sorting, indicating that the shallow lake of the basin under an oxidation environment may represent a favourable environment for the crystallization of palygorskite.

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控制坡缕石粘土岩形成的古气候、古盐度和氧化还原条件——以西北羊台洼滩盆地为例

摘要阳台湾盆地新近系白洋河组中下部盐湖沉积了含坡岭石的粘土岩和泥岩。研究了沉积物的岩石学、矿物学和地球化学特征，确定了坡缕石形成的控制因素。坡缕石粘土岩和泥岩具有明显不同的矿物组成。泥岩主要由碎屑矿物、坡缕石和伊利石组成，泥岩主要由混合层伊利石/蒙脱石和伊利石组成。坡缕石晶体完整，边缘锋利，与其他矿物交织在一起，表明其起源自生。化学特征表明，白洋河组中段坡长石型粘土岩沉积于干旱炎热气候下的盐湖环境。随着湖泊盐度的逐渐升高，石英、长石、白云石等碎屑矿物和碎屑粘土矿物在碱性介质中溶解，为坡纹石的结晶提供了Si4+、Mg2+和Al3+。坡缕石与一定数量的碎屑石英和长石共存，但圆度和分选程度有限，表明盆地浅湖处于氧化环境下，可能是坡缕石结晶的有利环境。

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来源期刊

Clay Minerals 地学-矿物学

CiteScore

3.00

自引率

20.00%

发文量

审稿时长

6 months

期刊介绍： Clay Minerals is an international journal of mineral sciences, published four times a year, including research papers about clays, clay minerals and related materials, natural or synthetic. The journal includes papers on Earth processes soil science, geology/mineralogy, chemistry/material science, colloid/surface science, applied science and technology and health/ environment topics. The journal has an international editorial board with members from fifteen countries.