甘肃西成铅锌矿田有机质特征对沉积环境的判识  

Sedimentary Environment Interpreted by the Characteristics of Organic Matters in Xicheng Ore-field

作　　者：张成君[1] 崔彦立[2] 

机构地区：[1]兰州大学资源环境学院,甘肃兰州730000 [2]吐哈油田勘探处,新疆鄯善839029

出　　处：《兰州大学学报（自然科学版）》2000年第1期121-126,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金!( 498710 72 )资助项目

摘　　要：西成铅锌矿田位于西秦岭海西褶皱带,矿床主要产于中泥盆统西汉水组及安家岔组的灰岩和碎屑岩中,矿床与有机质含量具有明显的相关性.矿田内有机质中干酪根由镜质组、壳质体、藻质体、惰质组和矿物质等组成,主要来源于陆生高等植物的纤维素、木质素、丹宁等,可溶有机质也反映出了相似的信息,沉积环境为海陆过渡相强还原—还原的偏碱性环境,并且也反映出西成矿田东部比西部经历了较强的热作用.有机质的分析表明岩石中有机质是沉积环境判识的一种有效指标,并对沉积环境介质以及沉积形成演化过程也具有一定的指示作用.Xicheng Pb- Zn ore- field is located in the Xihe- Huixian- Cheng beltof Gansu ranging from east L uoba in Hui county,to west L uoyu in Xihe county,a total of about85kilome- ters.It belongs to the Hercynian Age Kunlun- Qinling accretionary fold belt.Ore deposits here are obviously related with the contents of organic matters in the rocks.The components of kerogen in this area are mainly vitrinite,exinite,alginite and inertinite and from cellous, lingin,tannin and other high- grade terrestrial plants.And the soluble organic matters bear the same information.It is proved that the sedimentary environment is the transitive face from land to sea of strong reduction- reduction deviated alkali environmentand the action de- crease from east to west in the Xicheng ore- field.It is showed that organic matters in the rocks are one of the effective indicators of the sedimentary environment as well as its the medium and evolution.

关 键 词：西成矿田 可溶有机质 沉积环境 铅锌矿 

分 类 号：P618.405[天文地球—矿床学]