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The formation of Luoboling porphyry Cu-Mo deposit: Constraints from zircon and apatite
Li, Cong-ying1,2; Hao, Xi-luo3,8; Liu, Ji-qiang4; Ling, Ming-xing5; Ding, Xing5; Zhang, Hong6; Sun, Wei-Dong1,2,7
2017-02-01
Source PublicationLITHOS
Volume272Pages:291-300
SubtypeArticle
AbstractThe Luobuling porphyry Cu-Mo deposit belongs to the Late Cretaceous Zijinshan Cu-Au-Mo mineralization field in southeastern China. Due to intensive hydrothermal alteration and weathering, it is very difficult to collect fresh whole rock samples for geochemical and isotopic studies in Luobuling. Zircon and apatite are accessory minerals that are resistant to hydrothermal alterations. In this study, we compared the trace element and isotope compositions of zircon and apatite from ore-bearing and barren samples to understand the formation of the Luoboling Cu-Mo deposit. Zircon U-Pb LA-ICP-MS dating shows that the Luoboling porphyries formed at similar to 100 Ma (100.3 +/- 1.2 Ma, 100.6 +/- 1.5 Ma and 98.6 +/- 1.2 Ma), which belongs to the late stage mineralization of the Zijinshan mineralization field. Zhongliao porphyritic granodiorite has the same age as the deposit (99.5 +/- 1.6 Ma). The age of barren Sifang granodiorite is slightly older (109.7 +/- 0.8 Ma). All these zircon grains have high Ce4+/Ce3+ ratios, indicating high oxygen fugacities. The ore-bearing samples show variable epsilon(Hf)(t) of 73 to 02, suggesting either heterogeneous sources or mixing of two different magmas. Interestingly, the Hf isotope composition of barren samples is systematically higher (epsilon(Hf)(t) of -3.6 to 5.5), implying a lower contribution of crustal materials. The OH mole percent of apatite grains from barren samples (LBL22-03 and SF09-05) is similar to 0.5, which is higher than that of apatite from the ore-bearing samples (LBL20-01 LBL20-02 and L8L22-02), indicating lower F, Cl contents or higher water contents in the magma. In apatite from the ore-bearing samples, Sr is high, indicating the absence of plagioclase crystallization. In contrast, barren samples have varied and lower Sr, indicating that apatite crystallization was accompanied by plagioclase. These patterns were controlled by water contents because the crystallization of plagioclase is suppressed by high water contents in magmas. It also suggests that the lower OH of ore-bearing apatite was resulted from higher F, Cl in the magma. High oxygen fugacity and water contents of Luoboling plutons are favorable for mineralization, which also implies their close relations to plate subduction. (C) 2016 Elsevier B.V. All rights reserved.
KeywordPorphyry Zircon Apatite High Oxygen.fugacity Southeastern China Pacific Plate Subduction
DOI10.1016/j.lithos.2016.12.003
Indexed BySCI
Language英语
WOS IDWOS:000393265600020
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/136338
Collection深海极端环境与生命过程研究中心
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
3.Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, Guangzhou 510275, Guangdong, Peoples R China
4.State Ocean Adm, Inst Oceanog 2, SOA Key Lab Submarine Geosci, Guangzhou, Guangdong, Peoples R China
5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, 511 Kehua St, Guangzhou 510640, Guangdong, Peoples R China
6.Northwest Univ Xian, Dept Geol, Xian 710069, Peoples R China
7.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Guangzhou 510640, Guangdong, Peoples R China
8.Guangdong Key Lab Geol Proc & Mineral Resource Ex, Guangzhou 510275, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Li, Cong-ying,Hao, Xi-luo,Liu, Ji-qiang,et al. The formation of Luoboling porphyry Cu-Mo deposit: Constraints from zircon and apatite[J]. LITHOS,2017,272:291-300.
APA Li, Cong-ying.,Hao, Xi-luo.,Liu, Ji-qiang.,Ling, Ming-xing.,Ding, Xing.,...&Sun, Wei-Dong.(2017).The formation of Luoboling porphyry Cu-Mo deposit: Constraints from zircon and apatite.LITHOS,272,291-300.
MLA Li, Cong-ying,et al."The formation of Luoboling porphyry Cu-Mo deposit: Constraints from zircon and apatite".LITHOS 272(2017):291-300.
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