GEOCHEMICAL CHARACTERISTICS OF EARLY CARBONIFEROUS BASALTS IN SANTANGHU REGION,XINGJIANG AND THEIR SIGNIFICANCE IN TECTONIC SETTINGS

Gong Wenping; Lin Kexiang; Li Yibin

doi:10.11743/ogg19970410

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GEOCHEMICAL CHARACTERISTICS OF EARLY CARBONIFEROUS BASALTS IN SANTANGHU REGION,XINGJIANG AND THEIR SIGNIFICANCE IN TECTONIC SETTINGS
Vol. 18, Issue 4, Pages: 314-318(1997)
Online First：25 December 1997，

Published：1997
DOI： 10.11743/ogg19970410
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DOI：

Gong Wenping, Lin Kexiang, Li Yibin. GEOCHEMICAL CHARACTERISTICS OF EARLY CARBONIFEROUS BASALTS IN SANTANGHU REGION,XINGJIANG AND THEIR SIGNIFICANCE IN TECTONIC SETTINGS[J]. 1997, 18(4): 314-318. DOI： 10.11743/ogg19970410.

摘要

三塘湖地区早石炭世火山活动强烈

发育以安山岩类为主的玄武岩、安山岩、英安流纹岩的岩石组合。玄武岩类具有Al

含量高

铁含量低

TiO

含量低

大离子亲石元素及轻稀土元素富集的钙碱性系列特点。微量元素比值蛛网图和稀土元素配分型式具有岛弧钙碱性玄武岩的特征。利用不同构造环境玄武岩的Nb-Zr-Y图式、Cr-Ce/Y图式判别出三塘湖地区在早石炭世为岛弧构造环境。

Abstract

Volcanicity was violent during the Early Carboniferous in Santanghu region.The volcanic rocks consist of basalts

andesites and dacite liparite

with andesites playing the main part.Geochemical analysis indicates that the basalts are characterized by high content of Al

low contents of FeO+0.9Fe

and TiO

rich macroion lithophile element(LIL)and LREE.The spider diagram of trace element ratio and the REE distribution patterns show the characteristics of the island arc calc alkaline series.In addition

basalt discrimination diagrams

such as Nb-Zr-Y and Cr-Ce/Sr

suggest that Santanghu area was in an island arc envirnment during the Early Carboniferous.