- 责任者：Li Wei (Department of Geology College of Earth Sciences ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Liu Xianfan
- 刊名：Xinjiang Geology
- 出版年：2013
- 卷期：31(4)
- 关键词：黑云母花岗岩 ; biotite granite ; 岩浆矿床 ; magmatic deposit ; 西藏 ; Tibet
- 页码：p.346-352
- 图表：5 illus., 3 tables, 23 refs.
- 分类号：0801
- issnNo：ISSN1000-8845
- isbnNo：CN65-1092/P
Changdu area is located in the middle of Sanjiang metallogenic belt, has frequent Magmatism and strong tectonic acivity,and being an important non-ferrous and precious mentals base for its good potential of mineralization. The Xiaya rockbody,a Mesozoic intrusions,which is constituted by biotite adamellite,forming appoplysis and rock dikes. The chemical constituents of Xiaya biotite adamellite are characterized by high Si02 and K20hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">＋Na20 contents,but with low A1203,Ti02, Fe203hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">＋Fe0,Mg0,Ca0 contents.lt belongs calc-alkalic rock series with the average of Rittman index is 2.22 and Higher K20 content.The average of hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">￡REE,SCe/2Y,5Eu and hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">（La/Ybhansi-font-family: calibri; mso-hansi-theme-font: minor-latin">）N are 252.18hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">〉〈10-6,7.44,22.33 and 0.42. LREE and HREE have strong differentiation.The biotite adamellite is rich in LREE,and with negative Eu anomalies.ini- tial 87Sr/86Sr ratios and Ti02 of Xiaya rockbody are similar with continental crust values,which belongs to A-type gran- ites.lt were formed by re-melting of the upper crust substances in a post orogenic environment.The elements of Fhansi-font-family: calibri; mso-hansi-theme-font: minor-latin">、Bhansi-font-family: calibri; mso-hansi-theme-font: minor-latin">、W and Sn are enriched in Xiaya rockbody.The Fhansi-font-family: calibri; mso-hansi-theme-font: minor-latin">、B-rich volatile has an affinity for the rare metals,which make the elements of Whansi-font-family: calibri; mso-hansi-theme-font: minor-latin">、Sn first into the volatile-rich melt. The characteristics of strong depolymerization of volatiles promote the reaction of liquid immiscibility in fluorine-rich granitic magma,which make the Volatile-rich melt Separate from parent magma. The long-range transport of rare metals-rich melt conducive to the enrichment and mineralization of Whansi-font-family: calibri; mso-hansi-theme-font: minor-latin">、Sn.Combining the geological condition with the analysis of results of petrochemistry ^ trace element and REE of Xiaya biotite adamellite, this article makes a preliminary study of the mineralization of Xiaya rockbody.