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Geochemical characteristics and significance of apatite from the Koktokay pegmatitic rare -metal deposit, Altay, Xinjiang
Bai YingXiong1,2; Shen Ping1,2,3; Cao Chong1,4; Pan HongDi5; Li ChangHao1,2,3; Luo YaoQing1,2; Feng HaoXuan1,2; Suo Qingyu1,2
2021-09-01
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume37Issue:9Pages:2843-2860
AbstractApatite records and preserves the information of magmatic and hydrothermal processes. There is much apatite in Koktokay pegmatitic rare -metal deposit, which provides excellent conditions for studying the diagenetic and metallogenic process of pegmatite in the deposit. Previous studies on apatite from the deposit have focused on the characteristics of rare earth elements, and less on its constraints on the diagenesis and mineralization of pegmatite. In this paper, apatite from rare -metal enriched pegmatite ( No. 3) and relatively barren pegmatite ( No. 1, No. 2b, and No. 3a) of the Koktokay pegmatitic rare -metal deposit is selected as the research object to study their petrography and geochemistry. Petrographic analysis shows that the apatite is mainly associated with albite, quartz, muscovite, and spessartine. EPMA analysis shows that the F content of apatite is 3. 67% 4. 41%, and the Cl content is less than 0. 67%. The low Cl content indicates that the Cl content of the fluid exsolved from pegmatite melt is low; The Mn0 content of most apatite is 4. 67% 8. 71%, but the Mn0 content of apatite from No. 2b pegmatite changes greatly (1. 23% 14. 28%), which is due to the zoning structure of the apatite, suggesting that it was affected by later hydrothermal process, which promoted apatite dissolution and reprecipitation, resulting in great changes in Mn0 content. LA-ICP-MS analysis shows that the rare earth element content of apatite from the relatively barren pegmatite is low ( < 180 x 10 -6); On the contrary, the content of rare earth elements in apatite of the enriched pegmatite is high ( >700 x 10 -6) and has obvious REE tetrad effect ( the average value of TE, is 1. 7). The apatite from No. 1 and No. 3a pegmatite shows enrichment of light rare earth, reflecting the participation of bearing Cl hydrothermal fluid in their formation. The apatite of No. 3 pegmatite shows extreme negative Eu anomaly and positive Ce anomaly, while the apatite of No. 2b pegmatite shows strong negative Ce anomaly and medium negative Eu anomaly. The difference between Eu and Ce anomalies may be closely related to a large number of fluids dissolved by the melt in the magmatic-hydrothermal stage. The precipitation of apatite leads the decrease of HF content in hydrothermal fluid, promotes the crystallization of columbite-tantalite group mineral around apatite, and the entry of Nb and Ta into apatite. Therefore, apatite is not stable during the formation of pegmatite, and its zoning structure and changes of major and trace composition record the later hydrothermal process, suggesting that the process plays a vital role in the mineralization of pegmatite.
KeywordPegmatite Apatite Element composition Hydrothermal process Koktokay
DOI10.18654/1000-0569/2021.09.15
WOS KeywordNO. 3 PEGMATITE ; MAGMATIC-HYDROTHERMAL TRANSITION ; TRACE-ELEMENT CONCENTRATIONS ; CHINESE ALTAI ; DISSOLUTION-REPRECIPITATION ; GRANITIC PEGMATITES ; EARTH-ELEMENTS ; BELT EVIDENCE ; ICP-MS ; PETROGENESIS
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000747460200015
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104904
Collection矿产资源研究院重点实验室
Corresponding AuthorShen Ping
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, CAS Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
4.North China Univ Sci & Technol, Coll Min Engn, Tangshan 063210, Peoples R China
5.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Bai YingXiong,Shen Ping,Cao Chong,et al. Geochemical characteristics and significance of apatite from the Koktokay pegmatitic rare -metal deposit, Altay, Xinjiang[J]. ACTA PETROLOGICA SINICA,2021,37(9):2843-2860.
APA Bai YingXiong.,Shen Ping.,Cao Chong.,Pan HongDi.,Li ChangHao.,...&Suo Qingyu.(2021).Geochemical characteristics and significance of apatite from the Koktokay pegmatitic rare -metal deposit, Altay, Xinjiang.ACTA PETROLOGICA SINICA,37(9),2843-2860.
MLA Bai YingXiong,et al."Geochemical characteristics and significance of apatite from the Koktokay pegmatitic rare -metal deposit, Altay, Xinjiang".ACTA PETROLOGICA SINICA 37.9(2021):2843-2860.
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