CAJ | 학술논문

对湖北省长阳县火石山泥盆系黄家磴组-石炭系高骊山组21块泥岩样品的地球化学特征分析表明,黄家磴组、梯子口组、高骊山组的SiO2和Al2O3及TFe2O3的含量较高,表明受陆源物质影响较大;和州组下段CaO含量高,表明海水相对较深。Na2O及Mg/Ca值指示气候经历了温湿-干热-温湿变化的过程。微量元素,如Cu、Pb、Zn、Co、As因地球化学行为相似,总体变化曲线一致。稀土总量高,轻重稀土分馏程度高,具Ce、Eu负异常,稀土曲线指示样品来源一致。Cu/Zn,V/Cr,Ni/Co,U/Th,自生Uau和Ce/La比值表明研究区整体处于氧化环境中。Sr/Ba及B/Ga比值指示出近岸沉积特征。数学统计分析表明沉积环境相近的层位地球化学特征相近,沉积水动力条件与沉积介质的物化性质比较接近的层位,地球化学特征也较为相似,沉积环境明显不同的层位地球化学特征相距较远,由于总体处于海陆交互带,环境变化大,三角洲相可以与其相差较大的沉积环境表现出相近的地球化学特征。
대호북성장양현화석산니분계황가등조-석탄계고려산조21괴니암양품적지구화학특정분석표명,황가등조、제자구조、고려산조적SiO2화Al2O3급TFe2O3적함량교고,표명수륙원물질영향교대;화주조하단CaO함량고,표명해수상대교심。Na2O급Mg/Ca치지시기후경력료온습-간열-온습변화적과정。미량원소,여Cu、Pb、Zn、Co、As인지구화학행위상사,총체변화곡선일치。희토총량고,경중희토분류정도고,구Ce、Eu부이상,희토곡선지시양품래원일치。Cu/Zn,V/Cr,Ni/Co,U/Th,자생Uau화Ce/La비치표명연구구정체처우양화배경중。Sr/Ba급B/Ga비치지시출근안침적특정。수학통계분석표명침적배경상근적층위지구화학특정상근,침적수동력조건여침적개질적물화성질비교접근적층위,지구화학특정야교위상사,침적배경명현불동적층위지구화학특정상거교원,유우총체처우해륙교호대,배경변화대,삼각주상가이여기상차교대적침적배경표현출상근적지구화학특정。
The geochemical characteristics of twenty-one samples from the Devonian Huangjiadeng Formation to Carboniferous Gaolishan Formation at Huoshishan section,Western Hubei are studied.The high content of SiO2,Al2O3,TFe2O3 of Huangjiadeng Formation,Tizikou Formation,Gaolishan Formation,indicated they had been greatly influenced by the terrigenous resource,while the high content of CaO of the lower part of Hezhou Formation indicated that the sea water is relatively deep;the content of Na2O and the ratio of Mg/Ca means that climate experienced the process from warm and wet,to dry and hot,and to warm and wet.The trace elements change curve is consistent with high amount of REE,obvious differentiation of ∑LREE and ∑HREE and negative Ce and Eu abnormities.The similar curve of REE means all the samples are from the same origin.Cu/Zn,V/Cr,Ni/Co,U/Th,Uau and the Ce/La ratios indicate that the research area as a whole had been under an oxidized environment,while Sr/Ba and B/Ga ratios tells that they have been deposited nearshore.The mathematics statistical analysis results indicate that samples from similar sedimentary environment and hydrodynamic condition share the similar geochemical characteristics;correspondingly,those which are different from obvious different deposition environments.The delta facies shows similar geochemical characteristics with those different sedimentary environments can be explained as that it as a whole was in an area of flood and field alternately existed where the environmental variation was great.