广西东南部钦防海槽晚古生代硅质岩地球化学特征及其地质意义<sup>*</sup>

doi:10.7605/gdlxb.2014.01.077

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Abstract The Late Paleozoic siliceous rocks in the Qingfang Trough were well developed.Based on the analyses of major elements,trace elements and rare earth elements,it was concluded that the Late Paleozoic siliceous rocks contain high content of SiO₂ and high silicification degree;the Upper Devonian Frasnian and Lower Carboniferous siliceous rocks have lower Al/(Al+Fe+Mn)value (0.14-0.24;0.07～0.81)and higher U/Th value(0.34～5.09;0.16～10.1),whereas the Famennian and Lower-Middle Permian siliceous rocks have higher Al/(Al+Fe+Mn)value(0.4～0.95) and lower U/Th value(0.1～2.1),illustrating that the Frasnian and the Lower Carboniferous siliceous rocks were influenced by the hydrothermal process but the Famennian and the Lower-Middle Permian siliceous rocks were biogenic origin;Ce/Ce^*, La_N/Yb_N,and La_N/Ce_N values for the Upper Devonian siliceous rocks are 0.78～1.08,0.4～1.52 and 0.88～1.35,whereas these values for the Lower Carboniferous siliceous rocks are 0.55～0.91,0.12～1.8 and 1.12～1.79,and the Lower-Middle Permian siliceous rocks have Ce/Ce^*,La_N/Yb_N,and La_N/Ce_N values of 1.01～1.62,0.72～2.71 and 0.62～1.9;Geochemical characteristics of the Late Paleozoic siliceous rocks in the Qinfang Trough indicated that the Qinfang Trough expanded within an epicontinental sea environment during the Late Devonian with hydrothermal activity,then expanded again in the Early Carboniferous with siliceous rocks formed in deep sea basin environment,and in the Early Permian the Qinfang Trough shrinked gradually to a continental margin basin. In a conclusion,the Qinfang Trough is more like a sea basin and may be belong to the Aulacogen of Paleo-Tethys Ocean in Late Paleozoic,and an ocean crust had never been formed.

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	Articles by authors
	Hu Lisha
	Xu Yajun
	Du Yuansheng
	Huang Hongwei
	Xu Wangchun
	Kuang Guodun

Key words： Qinfang Trough siliceous rocks geochemistry Late Paleozoic

Received: 10 May 2013 Published: 01 February 2014

ZTFLH:	P313.3
	P594＋.1A

Corresponding Authors: Du Yuansheng,born in 1958,is a professor and Ph.D. supervisor of China University of Geosciences(Wuhan),and is mainly engaged in sedimentary geology of orogenic belt.E-mail: duyuansheng126@126.com.

About author: Hu Lisha,born in 1987,is a Ph.D. candidate of China University of Geosciences(Wuhan),and is mainly engaged in sedimentary geochemistry,basin and orogenic belts analyses.E-mail: hulisha2129@163.com.

Cite this article:

Hu Lisha,Xu Yajun,Du Yuansheng et al. Geochemical characteristics and its geological significance of the Late Paleozoic siliceous rocks in Qinfang Trough,southeastern Guangxi[J]. JOPC, 2014, 16(1): 77-88.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2014.01.077 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2014/V16/I1/77

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