Biogenic characteristics of Mesozoic cherts in southern Tibet and its significance

doi:10.1007/s11771-014-2088-z

	Biogenic characteristics of Mesozoic cherts in southern Tibet and its significance
	He Jun-guo 1,2; Zhou Yong-zhang 1,2; Li Hong-zhong 2,3
刊名	JOURNAL OF CENTRAL SOUTH UNIVERSITY
	2014-04-01
卷号	21 期号:4 页码:1477-1490
关键词	yialu profile chert biological texture hot spring southern Tibet
ISSN号	2095-2899
DOI	10.1007/s11771-014-2088-z
文献子类	Article
英文摘要	The Xialu chert, which contains abundant biological information, were investigated by major element analysis, micro-Raman, SEM and EPMA. The results show that SiO2 content of chert is 84.12%-93.08%, averaging 89.84%. The close packed structures of low degree crystallinity of quartz indicate the hydrothermal origin. SiO2 of modern hot springs exhibit loose silica pellets and nodular, beaded structures. Under polarization microscope, the presence of biological skeleton structures indicate that biological activities are involved in the hydrothermal deposition, which correspond to the geochemical characteristics: w(SiO2)/ w(K2O+Na2O), w(SiO2)/w(Al2O3) and w(SiO2)/w(MgO), with average values of 295.29, 68.88 and 284.45, respectively. SiO2 is enriched in the organism (radiolarian) centers, the degree order of SiO2 within the biologic structures is much higher than that of outside. The impurity minerals albites are formed earlier than the original deposition. Kaolinites, feldspars and mixture of organic materials display lower degree of crystallinities and accumulate as vermicular aggregates.
WOS关键词	ZANGBO SUTURE ZONE ; GEOCHEMICAL CHARACTERISTICS ; RARE-EARTH ; SEDIMENTARY ENVIRONMENTS ; GEOLOGICAL IMPLICATIONS ; CARBONACEOUS CHERTS ; RAMAN-SPECTROSCOPY ; WESTERN-AUSTRALIA ; GREENSTONE-BELT ; BEDDED CHERT
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL OF CENTRAL SOUTH UNIV TECHNOLOGY
WOS记录号	WOS:000335385700030
资助机构	National Natural Science Foundation of China(41273040 ; National Natural Science Foundation of China(41273040 ; 41303025) ; 41303025) ; National Natural Science Foundation of China(41273040 ; National Natural Science Foundation of China(41273040 ; 41303025) ; 41303025) ; National Natural Science Foundation of China(41273040 ; National Natural Science Foundation of China(41273040 ; 41303025) ; 41303025) ; National Natural Science Foundation of China(41273040 ; National Natural Science Foundation of China(41273040 ; 41303025) ; 41303025)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85412]
专题	中国科学院地质与地球物理研究所
通讯作者	He Jun-guo
作者单位	1.Sun Yat Sen Univ, Dept Geol, Guangzhou 510275, Guangdong, Peoples R China 2.Key Lab Geol Proc & Mineral Resources Guangdong P, Guangzhou 510275, Guangdong, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	He Jun-guo,Zhou Yong-zhang,Li Hong-zhong. Biogenic characteristics of Mesozoic cherts in southern Tibet and its significance[J]. JOURNAL OF CENTRAL SOUTH UNIVERSITY,2014,21(4):1477-1490.
APA	He Jun-guo,Zhou Yong-zhang,&Li Hong-zhong.(2014).Biogenic characteristics of Mesozoic cherts in southern Tibet and its significance.JOURNAL OF CENTRAL SOUTH UNIVERSITY,21(4),1477-1490.
MLA	He Jun-guo,et al."Biogenic characteristics of Mesozoic cherts in southern Tibet and its significance".JOURNAL OF CENTRAL SOUTH UNIVERSITY 21.4(2014):1477-1490.