检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:杨林[1,2] 林金辉[1] 王雷[2] 谭靖[2] 王兵[2]
机构地区:[1]成都理工大学,四川成都610059 [2]国土资源部贵阳矿产资源监督检测中心,贵州贵阳550004
出 处:《矿物岩石》2012年第2期12-19,共8页Mineralogy and Petrology
基 金:贵州省2011年度社发攻关计划(黔科合SY字[2011]3146号);国土资源部贵阳矿产资源监督检测中心科技基金(2010年度)
摘 要:以XRF、ICP-MS及常规化学分析方法为主要研究手段,对贵州罗甸玉的岩石化学特征进行研究,玉石常量化学特征表明,罗甸玉中透闪石的形成经历了Mg相对饱和及不饱和两个阶段,Mg相饱和的成矿阶段形成了白色罗甸玉中接近理想透闪石晶体化学组成的透闪石,其晶体化学通式为A0.01B2.00C5.34T8O22(OH)2;而在Mg不饱和阶段,则形成了青色系列罗甸玉中具有高Ca低Mg特点的透闪石,相应的晶体化学通式A0.01B2.35C4.13T8O22(OH)2。微量元素研究表明,罗甸玉中的白色与青色系列,由不同微量元素组合所表征的三个主因子有所差异,同时,罗甸玉中青色主要由其化学组成中微量的V,Cr引起;罗甸玉的稀土元素配分具有δCe和δEu异常的特点,稀土配分模式与围岩辉绿岩及灰岩均较为一致。在罗甸玉岩石化学特征研究的基础上,认为罗甸玉的形成是罗甸玉为岩床状辉绿岩顺层侵入时带来气液流体,与灰岩围岩发生长期的交代蚀变所形成的,灰岩提供成矿所需的Ca,Mg,而气液流体则主要提供了Si,为一种新类型的软玉矿体。Petrochemical characteristics of Luodian Jade from Guizhou Province were studied by using XRF, ICP-MS and conventional chemical analysis. Tremolite in Luodian Jade experienced two stages of relative saturated and unsaturated in Mg. Tremolite formed in Mg saturated phase is mainly white jade series, close to the standard crystal chemical composition with general formula of Ao.01 B2.00C5.34T8O22 (OH)2 ,whereas,relatively green jade series may appear in Mg unsaturated stage and is rich in Ca and poor in Mg with general formula of A0.01B2.35C4.13T8022 (OH)2. Analy- sis of trace elements shows that the formation of white jade series and green jade series is affected by different trace element associations, especially, Cr-V, Co-Ni and Mn-Sr. It is indicated that Cr and V ions in chemical composition are responsible for the green color of Luodian Jade. Moreover, REE analysis of Luodian Jade revealed abnormal characteristics in 3Ce and 3Eu, and chondrite- normalized REE distribution pattern is similar to that of the surrounding rock of diabase and lime- stone. On the basis of petro-chemical characteristic study of Luodian Jade, it is considered that Lu- odian Jade is a new type of nephrite jade formed in a long term contact metasomatism between the limestone and gas-liquid fluid brought by diabase intrusion. In the process of metallogenic metaso- matism, the limestone provides Ca and Mg, and the gas-liquid fluid s mainly provides Si for Luodi- an Jade.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.30