Characteristics of Intrusive Rock, Metasomatites, Mineralization and Atteration in Yemaquan Skarn Fe-Zn Polymetallic Deposit, Qinghai Province
详细信息
- 责任者：Liu Jiannan (Key Laboratory of Metallogeny and Mineral Resource Assessment ; MLR ; Institute of Mineral Resources ; CAGS ; Beijing 100037 ; China) ; Feng Chengyou
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(1)
- 关键词：铁矿 ; iron ores ; 锌矿 ; zinc ores ; 多金属矿 ; polymetallic ores ; 青海 ; Qinghai Province
- 页码：p.77-93
- 图表：illus., 6 tables, 67 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
The Yemaquan Fe-Zn polymetallic deposit is located at the junction belt between Chaidamu basin and Qimantag area,Qinghai.There are some Hercynian and Indosinian intrusive rocks exposed in the ore district.The strata in the ore district are mainly Sijiaoyanggou Group.The skarn mainly occurs within the carbonate rocks and igneous conversion boundaries.The skarn minerals are mainly garnet,clinopyroxene,vesuvianite and epidote.Metallic minerals mainly include magnetite,chalcopyrite,galena,sphalerite and pyrrhotite.Based on the detailed field geological investigation and the observation of geological sections and drill cores,the authors studied the petrogeochemical characteristics and mineralization of this deposit.The petrochemistry of diorite is characterized by low SiO2(51.90%~59.03%),high MgO(2.04%~3.44%) and TFeO(11.39%~11.67%),rich REE(318.57×10-6~327.76×10-6),and low LREE/HREE ratios(7.36~7.48).The monzonitic granite is characterized by high SiO2(77.36%~77.41%),low MgO(0.04%~0.10%),low TFeO(0.76%~1.08%),and high LREE/HREE ratios(9.14~9.37).The diopside-alkali metasomatites show stronger δEu negative anomaly(δEu=0.07~0.52) and lower LREE/HREE ratios(3.19~7.87)than its original rock.The diopside-sodic metasomatites have low MgO(0.36%~0.92%),high TFeO(3.05%~8.13%) than its original rock.The skarn from Yemaquan deposit can be further divided into two types:calcic skarn and magnesian skarn.The calcic skarn is mainly distributed in the contact zone and consists of garnet and clinopyroxene.The clinopyroxenes distributed near the intrusion have high content of diposide end-member,and the garnet has more andradite end-members at the edge.According to the mineral composition and mineral intergrowth association,the authors have inferred that the diorite possesses remarkable mineralization potentiality,and calcic skarn was formed at an oxidation stage,whereas the magnesian skarn was formed in a reduction state.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |