地质找矿论丛2017，Vol.32Issue(2)：236-244,9.DOI:10.6053/j.issn.1001-1412.2017.02.010
滇西福贡亚五夺透闪玉矿物学特征及成因
The gemological characteristics and genesis of the Yawuduo tremolite nephrite deposits in Fugong county,western Yunnan province, China
摘要
Abstract
In Yawuduo area,Fugong county,western Yunnan province occur widely different sized irregular nephrite dykes at,contact zone between mylonitized granite and marble intercalations of gneiss and schist.The results of microscopic observation,X-ray diffraction spectra and energy dispersion spectra and chemical analysis of the nephrite samples show that the refractive index is 1.60,hardness 5.6,and density about 2.9 g/cm3.The data meet requirements of jade and they can be served as one new type of the jade to exploit.The mineral volumetric measurement of the Yawuduo nephrite is tremolite (45％),diopside (40％),and calcite (5％),quartz (5％),and minor feldspar,garnet,apatite,sphene,monazite,etc.Percentage (mass fraction) of SiO2,CaO and MgO in tremolite is 54.54％,22.32％ and 18.62％ reapectively.Fe203,Na2O and Al2O3 are in minor amount.Crystal cell parameters,a0、b0、c0 and β of tremolite are 0.978× 10 10 m、1.785× 10-10 m、5.284× 10-10 m 及 104.45° respectively.The geological characteristics of the deposit and tracing analysis of REE of the wall rock reveal that the nephrite deposit is still a metamorphic hydrothermal deposit.However,it is formed by fissure filling of mixture of metamorphic fluid and residual magmatic fluid during regional synmagma,syndeformation-tensile extension thus should be a new genetic type of nephrite deposit.The mineralization is related to large-scale strikeslip shearing of Biluoxueshan-Chongshan shear zone and timely limited by Late Himalayan orogeny,about 22～15 Ma.The same geological setting and mineralization condition as the deposit is in huge area and is of great potential for prospecting.关键词
透闪石玉/矿物学特征/粉晶X衍射/能谱分析/云南省Key words
tremolite nephrite/mineralogic charateristicd/x-ray diffraction spectra/energy dispersion spectra/Yunnan province分类
天文与地球科学引用本文复制引用
廖程,薛传东,唐靓,杨志超..滇西福贡亚五夺透闪玉矿物学特征及成因[J].地质找矿论丛,2017,32(2):236-244,9.基金项目
国家自然科学基金项目(编号:40772067,编号:41373049)、中国地质调查局地质调查项目(编号:12120114064302,编号:1212011220908)及教育部基金项目(编号:20125314110006)联合资助. （编号:40772067,编号:41373049）
