梭菌SN-1菌株参与下形成的碳酸盐矿物组合及其主要矿物成分的动态变化  

The temporal changes of carbonate mineral assemblages formed by Clostridium sp.SN-1 strain and their main mineral composition

作　　者：王金平[1] 李福春[1] 郭文文[1] 汪君 刘铭艳 王果 

机构地区：[1]南京农业大学资源与环境科学学院,江苏南京210095 [2]中国核工业集团216大队,新疆乌鲁木齐830011

出　　处：《岩石矿物学杂志》2012年第4期627-632,共6页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(41172308;40930738);江苏高校优势学科建设工程资助项目

摘　　要：在Mg/Ca比值为6的Lagoa Vermelha改良培养基中,对分离自青海湖湖底沉积物的梭菌(Clostridiumsp.)进行了为期100 d的碳酸盐矿物培养实验,同时还完成了一组无菌对照实验。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分别对矿物成分和形态进行了测定和观察。实验结果表明:细菌培养实验的沉淀物数量始终多于无菌对照实验;在梭菌SN-1菌株作用下形成的碳酸盐矿物组合的变化趋势是方解石→方解石+单水碳钙石→单水碳钙石+方解石→单水碳钙石,而无菌对照实验产物中矿物的演化方向是单水碳钙石+方解石→方解石+单水碳钙石;在综合分析SEM和XRD观测结果的基础上,推测哑铃状矿物可能是高镁方解石,而球状矿物可能是单水碳钙石。Culture experiments of carbonate mineral using Lagoa Vermelha improved medium with 6 ： 1 molar ratio of Mg/Ca within 100 days were conducted under the mediation of Clostridiurn sp. （SN-1 strain） isolated from sediments in the Qinghai Lake. At the same time, aseptic experiments were carried out as the control. Mineral species and morphologies were determined by X-ray diffraction （XP, D） and scanning electron microscopy （SEM）, respectively. The results showed that：① The quantities of sediments in bacterial culture experiments were always more than those in the control ones. ② The change trend of carbonate mineral assemblages formed in Clostridiurn sp. SN-1 strain culture was calcite → calcite and monohydrocalcite→monohydrocalcite and cal- cite →monohydrocalcite, while in the control experiments the change trend was monohydrocalcite and calcite→calcite and monohydrocalcite; ③ Based on comprehensive analysis of SEM and XRD, the authors considered that dumbbell-shaped minerals might be high-magnesium calcite, while spherical minerals might be monohydrocalcite.

关 键 词：梭菌 方解石 单水碳钙石 哑铃状 动态变化 

分 类 号：P578.6[天文地球—矿物学] P579[天文地球—地质学]