Regional Metallogeny of Mo-Bearing Deposits in Northeastern China, with New Re-Os Dates of Porphyry Mo Deposits in the Northern Xilamulun District

Shu, Qihai; Chang, Zhaoshan; Lai, Yue‐Yun; Zhou, Yitao; Sun, Yong; Yan, Cong

doi:10.2113/econgeo.111.7.1783

Cited by 136 publications

(59 citation statements)

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“…The majority of the igneous rocks in NE China have Yanshanian ages [23,29,30] and have been attributed to the tectonic-thermal events related to the Paleo-Pacific plate subduction or subsequent slab rollback [23,29]. Coinciding with the Yanshanian magmatism, many hydrothermal ore systems formed in NE China, and many of them are Mo-dominant porphyry deposits [8,9,31], with less of skarn or epithermal types [31][32][33][34].…”

Section: Regional Geologymentioning

confidence: 99%

“…The Xilamulun district contains Archaean gneiss and Paleozoic schist and marble in the south and Mesozoic sedimentary, intrusive, and volcanic rocks in the north (Figure 1(b)). The Xilamulun district has more than 25 Mo deposits, six of which are of Triassic ages, while the rest are of Late Jurassic to Early Cretaceous ages (Figure 1(b) [8]). The Haisugou deposit is located in the northern Xilamulun district, and the magmatism and Mo mineralization occurred in Early Cretaceous [8,18].…”

Section: Regional Geologymentioning

confidence: 99%

“…China has more than half of the world's molybdenum metal [4], and many of the Mo deposits are similar to the Climax-type Mo deposits where molybdenite is almost the only sulfide [5]. Most of China's Mo deposits are located in the Qinling-Dabie orogenic belt in Central China (>8.5 Mt Mo metal [4,6,7]) and the eastern section of the Central Asian orogenic belt in northeastern China (>11 Mt Mo metal [8,9]). Unlike the Climax-type Mo deposits, which typically develop in backarc or intracontinental rifts and are associated with alkaline magmas [1], the porphyry Mo deposits in the Chinese Qinling-Dabie orogenic belt are related to high-K calcalkaline to shoshonitic magmas generated in syn-to postcollisional tectonic settings and therefore have been suggested to belong to a new class of Dabie-type (or collision-type) porphyry Mo deposits [7,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…However, recently Audétat and Li [13] argued that some of the previously proposed Dabie-type deposits can still be classified as Climax-type. Northeastern China has become the largest Mo ore region in China with the continuous discoveries of many porphyry [8]. These deposits are mainly Mo-only or Mo-dominant (with minor Cu) deposits, and many of the deposits have Yanshanian (Jurassic to Early Cretaceous) ages and have been suggested to be related to the subduction or subsequent slab rollback of the Paleo-Pacific oceanic plate [8].…”

Section: Introductionmentioning

confidence: 99%

“…The newly discovered Haisugou porphyry Mo deposit located in the northern Xilamulun district, NE China, is a typical Mo-only deposit where >95% of the sulfides are molybdenite [8,18,19]. The quartz veins or breccias with variable alterations prior to, synchronous to, and immediately after molybdenite precipitation are widely distributed within the ore-related granite and thus provide an excellent opportunity to investigate the fluids (as fluid inclusions hosted in quartz) throughout the hydrothermal evolution processes.…”

Section: Introductionmentioning

confidence: 99%

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Fluid Inclusion and Oxygen Isotope Constraints on the Origin and Hydrothermal Evolution of the Haisugou Porphyry Mo Deposit in the Northern Xilamulun District, NE China

Shu¹,

Lai²

2017

Geofluids

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The Haisugou porphyry Mo deposit is located in the northern Xilamulun district, northeastern China. Based on alteration and mineralization styles and crosscutting relationships, the hydrothermal evolution in Haisugou can be divided into three stages: an early potassic alteration stage with no significant metal deposition, a synmineralization sericite-chlorite alteration stage with extensive Mo precipitation, and a postmineralization stage characterized by barren quartz and minor calcite and fluorite. The coexistence of high-salinity brine inclusions with low-salinity inclusions both in potassic alteration stage (∼440 ∘ C) and locally in the early time of mineralization stage (380-320 ∘ C) indicates the occurrence of fluid boiling. The positive correlations between the homogenization temperatures and the salinities of the fluids and the low oxygen isotopic compositions ( 18 O fluid < 3‰) of the syn-to postmineralization quartz together suggest the mixing of magmatic fluids with meteoric water, which dominated the whole mineralization process. The early boiling fluids were not responsible for ore precipitation, whereas the mixing with meteoric water, which resulted in temperature decrease and dilution that significantly reduced the metal solubility, should have played the major role in Mo mineralization. Combined fluid inclusion microthermometry and chlorite geothermometer results reveal that ore deposition mainly occurred between 350 and 290 ∘ C in Haisugou.

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Section: Regional Geologymentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluid Inclusion and Oxygen Isotope Constraints on the Origin and Hydrothermal Evolution of the Haisugou Porphyry Mo Deposit in the Northern Xilamulun District, NE China

Shu¹,

Lai²

2017

Geofluids

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Age of theYongxin Audeposit in theLesser Xing'an Range: Implications for anEarly Cretaceousgeodynamic setting for gold mineralization inNE China

Zhong-hai

Sun

et al. 2018

Geological Journal

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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 206Pb/238U 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.

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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

Zhong-hai

Sun

Li³

et al. 2019

Geological Journal

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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 εHf(t) values of 5.4 to 12.0 and depleted bulk‐rock Sr–Nd–Pb isotopes ((87Sr/86Sr)i = 0.7049 to 0.7056, εNd(t) = 1.2 to 2.5, (206Pb/204Pb)i = 18.202 to 18.320). The andesite has zircon εHf(t) values of 5.6 to 13.6, (87Sr/86Sr)i of 0.7049 to 0.7051, εNd(t) of 1.0 to 1.6, and (206Pb/204Pb)i of 18.199 to 18.297. The ~120 Ma diorite porphyry and granite porphyry have zircon εHf(t) values of 3.7 to 10.0 and 3.6 to 10.2, respectively. These two units show large variations of 87Rb/86Sr 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 SiO2 indicate that magmas of the Early Cretaceous igneous rocks at Yongxin have low water content and thus have low potentiality for porphyry copper mineralization.

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Regional Metallogeny of Mo-Bearing Deposits in Northeastern China, with New Re-Os Dates of Porphyry Mo Deposits in the Northern Xilamulun District

Cited by 136 publications

References 76 publications

Fluid Inclusion and Oxygen Isotope Constraints on the Origin and Hydrothermal Evolution of the Haisugou Porphyry Mo Deposit in the Northern Xilamulun District, NE China

Fluid Inclusion and Oxygen Isotope Constraints on the Origin and Hydrothermal Evolution of the Haisugou Porphyry Mo Deposit in the Northern Xilamulun District, NE China

Age of theYongxin Audeposit in theLesser Xing'an Range: Implications for anEarly Cretaceousgeodynamic setting for gold mineralization inNE China

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

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