矿床地质2017，Vol.36Issue(1)：219-236,18.DOI:10.16111/j.0258-7106.2017.01.014
新疆雅满苏铁矿区碳酸盐岩地质地球化学特征及其对矿床成因的制约
Geological and geochemical features and genetic significant of carbonatite in Yamasu iron deposit, Xinjiang
摘要
Abstract
The Yarnansu iron deposit in Xinjiang is hosted in the lower Carboniferous Yamansu Formation.There are volcanic rocks,carbonatite and skarns in this iron deposit.Hence,the study of the relationship of carbonate rocks and skams to metallogenisis has important theoretical and practical significance.Based on detailed field investigation,major elements analysis,REE analysis and trace elements analysis of carbonatite,the authors investigated the geological and geochemical features of the carbonatite in the Yamansu iron ore district and its periphery.The carbonatites,containing neritic facies fossil and ooids,are distributed with volcanic rocks alternately,suggesting that the sedimentation and volcanic eruption occurred in a shallow sea environment.The types of carbonatite include micrite,finely-crystalline limestone,marble,marble with tuffaceous,calc-mylonite and calcite-tectonic-schist.Little change of main elements shows that no main components were brought in or taken out.REE and microelements also show insignificant variation,except for calcite-tectonic-schists,whose total REE and other,trace elements are lower than those of other types of carbonate rocks.This also shows that no foreign materials (including metallogenetic materials) were brought in.The calcite-tectonic-schists,being adjacent to the orebodies,were not skarnized.The authors infer that,during the process of formation and mineralization,the carbonite was only affected by structural schistosity alteration and hydrothermal recrystallization without contact metasomatism.Hence,the Yamansu iron deposit is not a skarn deposit (contact-metasomatic deposit) in the narrow sense,but a marine volcanic type deposit.The skarns in the ore district were formed by metasomatism of volcanic hydrothermal solution rather than by contact metasomatic metamorphism.The problem whether the lower carbonate formation provided rock-forming and ore-forming materials or not should be further studied.关键词
地球化学/碳酸盐岩/主量、微量元素/铁矿床/新疆雅满苏Key words
geochemistry/carbonatite/major element/microelement/iron deposit/Yamansu/Xingjiang分类
天文与地球科学引用本文复制引用
丁建华,李厚民,李立兴,陈靖,邓刚..新疆雅满苏铁矿区碳酸盐岩地质地球化学特征及其对矿床成因的制约[J].矿床地质,2017,36(1):219-236,18.基金项目
本文得到国家自然科学基金项目(编号:41272102)和中国地质调查项目(编号:1212010733806、12120113092700)联合资助 （编号:41272102）
