Study on the Order Degree and Geochemical Characteristics of Major Elements of Siliceous Rock in Eastern Qinling Area, China

doi:10.3964/j.issn.1000-0593(2014)11-3005-06

	Study on the Order Degree and Geochemical Characteristics of Major Elements of Siliceous Rock in Eastern Qinling Area, China
	Lu Ming-da 1; Li Hong-zhong 2; Zhao Ming-zhen 3; Ma Zhan-wu 4; Yang Zhi-jun 5; Liang Jin 5
刊名	SPECTROSCOPY AND SPECTRAL ANALYSIS
	2014-11-01
卷号	34 期号:11 页码:3005-3010
关键词	Siliceous rock Order degree Silica Eliminating impurity Eastern Qinling
ISSN号	1000-0593
DOI	10.3964/j.issn.1000-0593(2014)11-3005-06
文献子类	Article
英文摘要	Siliceous rocks were extensively distributed in the marine volcanic sedimentary formation of Erlangping Group in the Early Paleozoic in eastern Qinling area. These siliceous rocks formed in the same age, but had differences in the degree of crystallization and order because of the late diagenetic evolution. In the present study, the major elements and order degree of the siliceous rocks were studied, which were from the Erlangping Group in Xixia area, Songxian area and Nanzhao area of eartern Qinling orogenic belt. As shown in the results, the siliceous rocks contained SiO2 with percentage between 84. 75% and 94. 12% and average of 89. 09%. The SiO2/(K2O+Na2O) values were from 26. 69 to 114. 78 with 65. 67 as its average, and the values of SiO2/Al2O3 were from 10. 48 to 61. 52 with average of 30. 58. These above characteristics excellently agreed with the geochemical characteristics of hydrothermal siliceous rocks, which deposited in the continental margin environment. In the Raman analytical results, the quartz contributed to the characteristic Raman shifts at 394, 464, 465 and 467 cm(-1). In the results of Gaussian fitting the degrees of order increased with the order of siliceous rocks of Songxian area, Nanzhao area and Xixia area, which were witnessed by the descending in FWHM values of quartz in the siliceous rocks of Songxian area, Nanzhao area and Xixia area orderly. Disagreeing with the FWHM values of Gaussian fitting, the silica contents of the siliceous rocks had a rising trend of Songxian (87. 36%), Nanzhao (89. 57%), Xixia area (90. 35%), which meant a descending in impurity elements with the order of Songxian area, Nanzhao area and Xixia areas. According to this, there was high agreement between lower crystallinity degree and higher purity of silica, and this denoted that the rising in order degree of silica would result in lower impurity in siliceous rocks. Although the crystallinity degrees could change with the influences of temperature, pressure and its natural property, the impurity elements decreased with the rising in crystallinity degrees of silica. Although there was excluding of impurity elements during the increase in degrees of crystallinity and order, the key factor for the diversities of major elements in siliceous rocks was not likely to be the excluding of impurity elements during the increase in the crystallinity degrees in silica. In this study, the Raman analysis exhibited to be an effective way to understand the degree of order for the silica of the siliceous rocks, which would be a potential way to study the subsequent diagenetic evolution of siliceous rocks.
WOS关键词	CHERT
WOS研究方向	Spectroscopy
语种	英语
出版者	OFFICE SPECTROSCOPY & SPECTRAL ANALYSIS
WOS记录号	WOS:000344447700024
资助机构	Natural Science Foundation of China(41303025) ; Natural Science Foundation of China(41303025) ; Natural Science Foundation of China(41303025) ; Natural Science Foundation of China(41303025) ; Natural Science Foundation of China(41303025) ; Natural Science Foundation of China(41303025) ; Natural Science Foundation of China(41303025) ; Natural Science Foundation of China(41303025)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85044]
专题	中国科学院地质与地球物理研究所
通讯作者	Li Hong-zhong
作者单位	1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resource, Beijing 100029, Peoples R China 3.S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China 4.Beifang Univ Nationality, Coll Civil Engn, Yinchuan 750021, Peoples R China 5.Sun Yat Sen Univ, Dept Earth Sci, Guangzhou 510275, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Lu Ming-da,Li Hong-zhong,Zhao Ming-zhen,et al. Study on the Order Degree and Geochemical Characteristics of Major Elements of Siliceous Rock in Eastern Qinling Area, China[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2014,34(11):3005-3010.
APA	Lu Ming-da,Li Hong-zhong,Zhao Ming-zhen,Ma Zhan-wu,Yang Zhi-jun,&Liang Jin.(2014).Study on the Order Degree and Geochemical Characteristics of Major Elements of Siliceous Rock in Eastern Qinling Area, China.SPECTROSCOPY AND SPECTRAL ANALYSIS,34(11),3005-3010.
MLA	Lu Ming-da,et al."Study on the Order Degree and Geochemical Characteristics of Major Elements of Siliceous Rock in Eastern Qinling Area, China".SPECTROSCOPY AND SPECTRAL ANALYSIS 34.11(2014):3005-3010.