东秦岭地区硅质岩的有序度及常量元素地球化学特征研究

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

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Abstract 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.

Key words：Siliceous rock;Order degree;Silica;Eliminating impurity;Eastern Qinling

Received: 2013-12-25 Accepted: 2014-04-21

ZTFLH:

O657.3

Corresponding Authors: LI Hong-zhong2 E-mail: lihongzhong01@aliyun.com

Cite this article:

Lü 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.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2014)11-3005-06 OR https://www.gpxygpfx.com/EN/Y2014/V34/I11/3005

[1] Li H, Zhai M, Zhang L, et al. The Scientific World Journal, 2013, 2013: 1.
[2] FENG Sheng-bin，ZHOU Hong-rui，YAN Chang-hai, et al(冯胜斌, 周洪瑞, 燕长海, 等). Acta Sedimentologica Sinica(沉积学报), 2007, 25(4): 564.
[3] ZHOU Yong-zhang，FU Wei，YANG Zhi-jun, et al (周永章, 付伟, 杨志军, 等). Acta Petrologica Sinica(岩石学报), 2008, 24(3): 600.
[4] Lynne B Y, Campbell K A, Moore J N, et al. Sedimentary Geology, 2005, 179(3): 249.
[5] ZHAO Jiao，CHEN Dan-ling，TAN Qing-hai, et al(赵姣, 陈丹玲, 谭清海, 等). Earth Science Frontiers(地学前缘), 2012, 19(4): 118.
[6] LI Hong-zhong，ZHOU Yong-zhang，ZHANG Lian-chang，et al(李红中, 周永章, 张连昌, 等). Acta Petrologica Sinica(岩石学报), 2012, 28(11): 3679.
[7] LI Hong-zhong，ZHOU Yong-zhang，YANG Zhi-jun，et al(李红中, 周永章, 杨志军, 等). Acta Petrologica Sinica(岩石学报), 2009, 25(11): 3094.
[8] Murray R W, Buchholtz Ten Brink M R, Gerlach D C, et al. Geochimica et Cosmochimica Acta, 1992, 56: 1897.
[9] ZHANG Fu-xin(张复新). Geology and Prospecting(地质与勘探), 1989, 25(5): 11.
[10] Adachi M, Yamamoto K, Sugisaki R. Sedimentary Geology, 1986, 47(1): 125.
[11] WEN Lu, LIANG Wan-xue, ZHANG Zheng-gang, et al(闻辂, 梁婉雪, 章正刚, 等). Mineral Infrared Spectroscopy(矿物红外光谱学). Chongqing: Chongqing University Press(重庆: 重庆大学出版社), 1989. 190.
[12] Noons R E, Devonshire R, Clapp T V, et al. Journal of Non-Crystalline Solids, 2008, 354(26): 3059.
[13] LI Hong-zhong，ZHOU Yong-zhang，YANG Zhi-jun, et al(李红中, 周永章, 杨志军, 等). Journal of Jilin University·Earth Science Edition(吉林大学学报·地球科学版), 2011, 17(4): 290.
[14] Ostroumov M, Faulques E, Lounejeva E. Comptes Rendus Geoscience, 2002, 334(1): 21.
[15] LI Hong-zhong，ZHOU Yong-zhang，YANG Zhi-jun, et al(李红中，周永章，杨志军, 等). Earth Science Frontiers(地学前缘), 2010(4).
[16] LI Hong-zhong，YANG Zhi-jun，ZHOU Yong-zhang, et al(李红中，杨志军，周永章, 等). Journal of China University of Geosciences·Earth Science(中国地质大学学报·地球科学), 2009, 34(2): 299.