Geological and geochemical characteristics of basalts from Hardat Tolgoi Mine, Inner Mongolia, China  

作　　者：XU Hui CHEN Jinquan LU Zhaohua 

机构地区：[1]School of Chemical and Environmental Engineering, China University of Mining & Technology [2]Shandong Provincial Engineering and Technology Research Center for Wild Plant Resources Development and Application of Yellow River Delta,Binzhou University [3]State Key Laboratory of Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University

出　　处：《Chinese Journal Of Geochemistry》2014年第2期145-154,共10页中国地球化学学报

基　　金：supported by National Nature Science Foundation of China(No.40973030)

摘　　要：Basalts from Hardat Tolgoi Mine were studied systematically by using petrochemical and isotope geochemical methods in order to discuss their chemical properties, diagenetic material sources and tectonic environment. The analysis results indicate that the alkali basalts are characterized by low silica and high alkalinic(Na>K) and iron-titanium contents. The distribution patterns of the rare earth elements(REE) are the "rightist" type, which typically show evident fractionation between light REEs and heavy REEs with(La/Yb)N ratios from 8.04 to 10.4, but no significant negative Eu anomalies were observed(δEu=1.01 to 1.04). The basalts are relatively enriched in large ion lithophile elements(LILE, Ba, Sr) and high field strength elements(HFSE, Nb, Ta, Hf). Ratios of 206Pb/204Pb vary between 18.434 and 18.550, ratios of 207Pb/204Pb are between 15.541 and 15.569, and ratios of 208Pb/204Pb are between 38.331 and 38.536. The diagenetic substance is believed from the asthenospheric mantle and in intraplate environment, which was constructed during continent stretch, without being significantly contaminated by crustal materials.Basalts from Hardat Tolgoi Mine were studied systematically by using petrochemical and isotope geo- chemical methods in order to discuss their chemical properties, diagenetic material sources and tectonic environ- ment. The analysis results indicate that the alkali basalts are characterized by low silica and high alkalinic （Na〉K） and iron-titanium contents. The distribution patterns of the rare earth elements （REE） are the ＂rightist＂ type, which typically show evident fractionation between light REEs and heavy REEs with （La/Yb）y ratios from 8.04 to 10.4, but no significant negative Eu anomalies were observed （SEu=l.01 to 1.04）. The basalts are relatively enriched in large ion lithophile elements （LILE, Ba, Sr） and high field strength elements （HFSE, Nb, Ta, Hf）. Ratios of 206pb/204pb vary between 18.434 and 18.550, ratios of 207pb/204pb are between 15.541 and 15.569, and ratios of 206spb/204pb are between 38.331 and 38.536. The diagenetic substance is believed from the asthenospheric mantle and in intraplate environment, which was constructed during continent stretch, without being significantly contaminated by crustal materials.

关 键 词：地质地球化学特征 玄武岩 内蒙古 成岩物质来源 中国 地球化学方法 构造环境 高场强元素 

分 类 号：P618.4[天文地球—矿床学]