赣东北地区不同时代硅质岩的地球化学特征及其地质意义

赣东北地区不同时代硅质岩的地球化学特征及其地质意义

吴新华1, 楼法生1, 王玉净2, 宋志瑞1, 杨群2, 邓国辉1, 黄志忠1, 凌联海1

1. 江西省地质调查院，南昌向塘 330201; 2. 中国地质科学院南京地质古生物研究所，南京 210008

收稿日期:2004-06-20 修回日期:2004-06-20 出版日期:2004-06-20 发布日期:2004-06-20

Geochemical Characteristics for Siliceous Rocks of Different Ages in Northeastern Jiangxi and Their Geological Significance

WU xin-hua1, LOU Fa-sheng1, WANG Yu-jing2, SONG Zhi-rui1, YANG Qun2, DENG Guo-hui1, HUANG Zhi-zhong1, LING Lian-hai1

1. Jiangxi Institute of Geological Survey, Xiangtang, Nanchang 330201, China; 2. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China

Received:2004-06-20 Revised:2004-06-20 Online:2004-06-20 Published:2004-06-20

摘要/Abstract

摘要： 赣东北地区硅质岩各时代均有不同程度的发育，各时代硅质岩的SiO2含量变化范围为74．90％～97．19％，Si／Al为10．84～93．21，与Al2O3呈较好的负相关关系，表明它们含有较高比例的陆源泥质沉积物，硅质岩样品的Al2O3／(Al2O3+F2O3)=0．60～0．99，Ce／Ce=0．99～1．22，(La／Ce)N=0．91～1．83，V／Y<5．78，Ti／V>17。上述特征表明本区硅质岩形成于大陆边缘构造环境，而与大洋盆地及洋中脊构造环境无关。自古生代以来，该地区没有出现深海大洋盆地环境。

Abstract: The siliceous rocks are widely developed in strata of different ages in the northeastern JianXi Province．Their Si02 contents are in the range of72．2％～97．19％，and their Si／Al ratios are 10．84～9321．The Si02 contents are well negatively correlated with A]2O3 contents．This implies that these rocks have a source with higher proportion of terrestrial muddy sediments．Some geochemical characteristics of these siliceous rocks ale shown below： AL2O3／( AL2O3+Fe203)=0．60～0．99，Ce／Ce =0．99～1．22，(La／Ce)N=0．91～1．83；V／Y<5．78，Ti／V>17．These characteristics indicate that they were formed in a tectonic environment of continental margin．There is no relation with the deep oceanic basins and／or mid-ocean ridges．Since the Paleozoic the tectonic environment of deep oceanic basins was not developed in this region．

吴新华, 楼法生, 王玉净, 宋志瑞, 杨群, 邓国辉, 黄志忠, 凌联海. 赣东北地区不同时代硅质岩的地球化学特征及其地质意义[J]. J4.

WU xin-hua1, LOU Fa-sheng1, WANG Yu-jing2, SONG Zhi-rui1, YANG Qun2, DENG Guo-hui1, HUANG Zhi-zhong1, LING Lian-hai1. Geochemical Characteristics for Siliceous Rocks of Different Ages in Northeastern Jiangxi and Their Geological Significance[J]. J4.