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Geochemical attributes of magmatic apatite in the Kukaazi granite from western Kunlun orogenic belt, NW China: Implications for granite petrogenesis and Pb-Zn (-Cu-W) mineralization
Tehseen Zafar;  Cheng-Biao Leng;  Xing-Chun Zhang;  Hafiz UrRehman
2019
发表期刊Journal of Geochemical Exploration
卷号204页码:256-269
摘要

Apatite is a significant accessory mineral which is ubiquitous in Kukaazi granitic bodies and provides vital geological information concerning petrogenetic as well as metallogenic attributes. Particularly, igneous apatite is important to delineate nature of parental magma and its characteristics. Here we present new EPMA and LA-ICP-MS data on magmatic apatite of Kukaazi pluton to explore its potential in petrogenesis as well as mineralization and this deposit is widely exposed in western Kunlun, NW China. Our results reveal that the apatite can be characterized as fluorapatite and it reflects the parental magma characteristics of Kukaazi granite. The apatite exhibits high fluorine content, right inclined distribution pattern with enrichment of light rare earth elements (LREEs), a prominent moderate negative Eu anomaly and this anomaly is possibly resulting from plagioclase crystallization prior to apatite. The negative correlation and variation of δCe and δEu together with the moderate negative Eu anomaly suggests that the parental magma of Kukaazi granite have moderate oxidizing nature. The apatite also reveals Kukaazi pluton with adakitic affinity containing higher Sr/Y and Eu/Eu* ratios. This implies that the fluorapatite can be robust tool for distinguishing the adakite plutons and may preserve original Sr/Y and Eu/Eu* ratios as a result of no influence of hydrothermal alteration. Our results also indicate that apatite Cl/F ratio is a potential indicator to track the content of magmatic volatiles and pointer for mineralization. It is inferred that Cl/F ratio in the parental magma of Kukaazi pluton is low, attributable to source control and discrepancy in the Cl/F values can be ascribed to variability of degassing. Halogen data indicates low Cl, fairly high F and low Cl/F ratios which implies that the parental magma of Kukaazi granite is produced in consequence of partial melting of lower crust material. The negative correlation of F and Cl suggests crystallization of Kukaazi apatite from hydrous parental magma. Besides, apatite Eu/Eu* vs. Cl content is significant as proxy record to discriminate mineralized rock from unmineralized. Based on Eu/Eu* vs. Cl plot, we propose that the Kukaazi granite is mineralized. Furthermore, variation and positive correlation between F/Cl ratios and F contents, increase in fluorine concentration, (La/Yb) N and δEu possibly support process of magmatic differentiation. Based on apatite geochemistry, we identified two types of ore deposits specifically Mo-W and Cu deposit in Kukaazi area. In comparison, the apatite of Mo-W deposit is distinguished by slightly higher fluorine and Y, lesser Sr and δEu values however, copper deposits are characterized by higher Sr, δEu values and lesser F, Y. These elements of apatite are prime prolific indicators and proxies for distinguishing fertile granite from barren one. Thus, in view of these findings, we confirm that apatite is a potential pointer of petrogenesis, metallogenesis, mineralization and ore varieties.

关键词Magmatic Apatite kukaazi Deposit rare Earth Elements (Rees) adakite moderate Oxidation State petrogenetic Attributes
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10846
专题矿床地球化学国家重点实验室
作者单位1.Geochemical attributes of magmatic apatite in the Kukaazi granite from western Kunlun orogenic belt, NW China
2.State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Department of Earth and Environmental Sciences, Kagoshima University, Kagoshima, Japan
推荐引用方式
GB/T 7714
Tehseen Zafar;Cheng-Biao Leng;Xing-Chun Zhang;Hafiz UrRehman. Geochemical attributes of magmatic apatite in the Kukaazi granite from western Kunlun orogenic belt, NW China: Implications for granite petrogenesis and Pb-Zn (-Cu-W) mineralization[J]. Journal of Geochemical Exploration,2019,204:256-269.
APA Tehseen Zafar;Cheng-Biao Leng;Xing-Chun Zhang;Hafiz UrRehman.(2019).Geochemical attributes of magmatic apatite in the Kukaazi granite from western Kunlun orogenic belt, NW China: Implications for granite petrogenesis and Pb-Zn (-Cu-W) mineralization.Journal of Geochemical Exploration,204,256-269.
MLA Tehseen Zafar;Cheng-Biao Leng;Xing-Chun Zhang;Hafiz UrRehman."Geochemical attributes of magmatic apatite in the Kukaazi granite from western Kunlun orogenic belt, NW China: Implications for granite petrogenesis and Pb-Zn (-Cu-W) mineralization".Journal of Geochemical Exploration 204(2019):256-269.
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