Wen‐Xi Xu

Shanghai Institute of Geological Survey

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Jinggui Sun

Jilin University

Yan Guo

China Power Engineering Consulting Group (China)

Chang‐Lu Lü

Shanghai Institute of Geological Survey

Zhonghai Zhao

China Geological Survey

Song Wu

Shenzhen University

Liang Ren

Changchun University of Technology

Mingqian Wu

University of Windsor

Zhong‐Xu Hu

Qiqihar Institute of Engineering

Guang‐Hui Li

Shanghai Institute of Geological Survey

Liu Jin

Institute of Hydrobiology

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Jilin University

Shanghai Institute of Geological Survey

China University of Geosciences (Beijing)

Sun Yat-sen University

China University of Geosciences

Ministry of Natural Resources

Chinese Academy of Sciences

Northwest A&F University

University of Electronic Science and Technology of China

Jilin Medical University

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Age of the Yongxin Au deposit in the Lesser Xing'an Range: Implications for an Early Cretaceous geodynamic setting for gold mineralization in NE China

Geological Journal (2018)

Zhonghai Zhao Jinggui Sun Guang‐Hui Li Wen‐Xi Xu Chang‐Lu Lü

The newly discovered Yongxin Au deposit in the Lesser Xing'an Range of north‐eastern Heilongjiang Province, NE China, has a resource of ~20 t with a grade of 4.1 g/t Au. The deposit is hosted by Carboniferous syenogranite and mylonite, and Cretaceous diorite porphyry and granite porphyry. The syenogranite has a LA‐ICP‐MS 206 Pb/ 238 U zircon age of 316 ± 2 Ma, and both the granite porphyry and diorite porphyry yield an age of 119 ± 1 Ma. The Rb–Sr isochron age of Au‐bearing pyrite from hydrothermal breccia‐type ore is 107 ± 4 Ma, and this is interpreted as the mineralization age of the Yongxin deposit. In combination with published geochronological data, we argue that epithermal Au mineralization in NE China formed during the period ca. 124 to 107 Ma and was produced during rollback of Palaeo‐Pacific oceanic slab. The Cretaceous epithermal Au deposits are distributed in the Erguna Massif, Lesser Xing'an Range, Zhangguangcai Range, and Jiamusi and Nadanhada terranes. In combination with the coeval porphyry Mo deposits present in these areas, we propose that the Erguna Massif, Lesser Xing'an Range, north‐eastern Great Xing'an Range, and eastern Jiamusi and Nadanhada terranes, where only epithermal gold deposits were discovered up to date, might be prospective for concealed porphyry Cu or Mo deposits.

Diorite

Massif

Molybdenite

Breccia

Plutonism

10.1002/gj.3310

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Early Cretaceous gold mineralization in the Lesser Xing’an Range of NE China: the Yongxin example

International Geology Review (2018)

Zhonghai Zhao Jinggui Sun Guanghui Li Wen‐Xi Xu Chang‐Lu Lü

The northern Lesser Xing’an Range in NE China hosts many gold deposits. However, genesis and tectonic background for the mineralization remain unclear. The newly discovered Yongxin gold deposit in this region provides a good example for understanding the related issues. Two economic orebodies have been recognized at Yongxin and they are mainly hosted in the hydrothermal breccias. Zircon U–Pb ages of granite porphyry and diorite porphyry are 119.3 ± 0.7 Ma and 119.9 ± 0.6 Ma, respectively. These data provide constraints to the upper limit of ore-forming age. The δ34S values of pyrite from orebodies range from 2.3‰ to 5.1‰. The 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios of the pyrite are of 18.126–18.255, 15.492–15.537 and 37.880–38.019, respectively. The δ18OH2O and δD values of ore-forming fluids range from −12.5‰ to 1.8‰ and from −124.8‰ to −102.1‰, respectively. The REE compositions of gold-bearing pyrite are similar to those of the volcanic rocks of the Longjiang formation, diorite porphyry and granite porphyry. The combined geological, geochronological and geochemical characteristics of the Yongxin gold deposit indicate that the ore-forming materials were likely sourced from the volcanic rocks of the Longjiang formation, diorite porphyry and granite porphyry, whereas the ore-forming fluids are dominated by meteoric water. The Yongxin gold deposit could be a product of the Early Cretaceous large-scale gold mineralization in northeast China which occurred in an extensional tectonic setting and were related to the rollback of the subducted Paleo-Pacific Oceanic Plate beneath the continental margin of northeast China.

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10.1080/00206814.2018.1522521

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Zircon of the No. 782 deposit from the Great Xing’an Range in NE China: Implications for Nb-REE-Zr mineralization during magmatic-hydrothermal evolution

Ore Geology Reviews (2018)

Mingqian Wu Baofeng Tian Dehui Zhang Guo-Zhan Xu Wen‐Xi Xu

Metasomatism

10.1016/j.oregeorev.2018.09.006

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Zircon U–Pb geochronology and Sr–Nd–Pb–Hf isotopic constraints on the timing and origin of the Early Cretaceous igneous rocks in the Yongxin gold deposit in the Lesser Xing'an Range, NE China

Geological Journal (2019)

Zhonghai Zhao Jinggui Sun Guanghui Li Wen‐Xi Xu Chang‐Lu Lü

The Lesser Xing'an Range in NE China is an important gold district. However, the age and genesis of Early Cretaceous magmatic rocks that are coeval with gold mineralization remain obscure. A suite of Early Cretaceous igneous rocks in a newly discovered gold deposit at Yongxin was conducted zircon U–Pb dating and Hf isotope and bulk‐rock geochemistry and Sr–Nd–Pb isotope analyses. A dacite of the Guanghua Formation and an andesite of the Longjiang Formation have zircon U–Pb ages of 111.7 ± 1.5 Ma and 119.7 ± 1.9 Ma, respectively. The dacite has zircon ε Hf (t) values of 5.4 to 12.0 and depleted bulk‐rock Sr–Nd–Pb isotopes (( 87 Sr/ 86 Sr) i = 0.7049 to 0.7056, ε Nd (t) = 1.2 to 2.5, ( 206 Pb/ 204 Pb) i = 18.202 to 18.320). The andesite has zircon ε Hf (t) values of 5.6 to 13.6, ( 87 Sr/ 86 Sr) i of 0.7049 to 0.7051, ε Nd (t) of 1.0 to 1.6, and ( 206 Pb/ 204 Pb) i of 18.199 to 18.297. The ~120 Ma diorite porphyry and granite porphyry have zircon ε Hf (t) values of 3.7 to 10.0 and 3.6 to 10.2, respectively. These two units show large variations of 87 Rb/ 86 Sr ratios (<1) and similar Sr–Nd–Pb isotopes compositions. All rock units are enriched in light rare earth elements and large‐ion lithophile elements and depleted in high‐field‐strength elements. The formation of Yongxin Early Cretaceous igneous rocks was related to variable degrees of partial melting from Jurassic basalt in the lower crust with significant contribution from ancient continental materials. The low Sr/Y ratios (2–24) and negative correlations between Sr, Eu/Eu, and SiO 2 indicate that magmas of the Early Cretaceous igneous rocks at Yongxin have low water content and thus have low potentiality for porphyry copper mineralization.

Geochronology

Dacite

Diorite

10.1002/gj.3545

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Citations (8)