Possible source of Au in the Jiaodong area from lower crustal sulfide cumulates: Evidence from oxygen states and chalcophile elements contents of Mesozoic magmatic suites

Dong, Leilei; Yang, Zhiming; Liu, Yanhong; Song, Mingchun

doi:10.1016/j.oregeorev.2022.105268

Cited by 11 publications

(8 citation statements)

References 65 publications

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“…These samples include the Jurassic Linglong, Biguo, and Luanjiahe granites and the Guojialing, Congjia, and Shangzhuang granodiorites from the western part of the Jiaodong Peninsula, and the intrusive rocks in the Kunyushan area of the Sulu Orogen. The mineral assemblages and textures of the magmatic rocks from the Jiaobei Terrane are well illustrated in previous studies (Dong et al, 2023b). Microphotographs and pictures of some representative samples are shown in Figure 2.…”

Section: Samples and Analytical Methodssupporting

confidence: 79%

“…Eu/Eu* values in the Late Jurassic and Early Cretaceous zircons (both for the >120 Ma and <120 Ma) display insignificant increasing or decreasing trends with elevated Hf contents (Figures 5A, C, E), although there are large Eu/Eu* variations in these zircon grains. Compiled data also exhibit overlapping Eu/Eu* values and variational trends to our data (Dong et al, 2023a;Dong et al, 2023b). This would mean that there is no plagioclase fractionation after extraction of the melt and prior to the crystallization of zircon for all three groups of zircon grains.…”

Section: Effect Of Fractionation On Zircon Eu/eu*supporting

confidence: 61%

“…The data from this study show that Dy/Yb ratios for the Late Jurassic zircons decrease with increasing Hf contents (Figure 5B). However, this trend is not apparent when considering all the zircon data from published literature (Dong et al, 2023a;Dong et al, 2023b). Dy/Yb ratios for the Early Cretaceous (>120 Ma) zircons remain constant with increasing Hf concentrations (Figure 5D).…”

Section: Effect Of Fractionation On Zircon Eu/eu*mentioning

confidence: 88%

“…For the three groups of zircons, the REE patterns are, in general, similar and are not further distinguished. The literature data source isDong et al, 2023b;Dong et al, 2023c.…”

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confidence: 99%

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Crustal thickness of the Jiaodong Peninsula in the Mesozoic: Implications for the destruction of the North China Craton

et al. 2023

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The North China Craton underwent extensive and widespread crustal reworking (or decratonization) during the Mesozoic. However, how the decratonization operated is not well understood. Zircon compositions are widely used by the scientific community to reconstruct crustal thicknesses. In this study, we sampled 13 magmatic rocks in the Jiaodong Peninsula and used zircon Eu/Eu* to constrain the crustal thickness of the Jiaodong area and reveal decratonization processes in the Mesozoic time. The reconstructed crustal thickness using zircon Eu/Eu* is approximately 70 km in the Jurassic, and this value is 89 km at around 130 Ma, after which the crustal thickness drops to 30–40 km at ca. 110 Ma. These results are generally compatible with or slightly higher than the calculation results using a whole-rock La/Yb proxy for the Jurassic and ∼130 Ma rocks. Crustal thickness estimated using a whole-rock La/Yb proxy for the ∼110 Ma rocks is thicker than 70 km, which is not consistent with the geological facts and the result given by zircon proxy. The whole-rock proxy failed in estimating crustal thickness because of amphibole fractionation for the ∼110 Ma rocks. The crustal thickening from Jurassic to ∼130 Ma was probably related to the westward subduction of the Paleo-Pacific slab. The thinning of the crust from 130 to 110 Ma is not a rapid process but occurs more slowly than expected, which might be explained by the chemical erosion process rather than a mechanical delamination model. The chemical erosion was most likely induced by a rollback of the subducting slab and an upwelling of the asthenosphere.

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Section: Samples and Analytical Methodssupporting

confidence: 79%

Section: Effect Of Fractionation On Zircon Eu/eu*supporting

confidence: 61%

Section: Effect Of Fractionation On Zircon Eu/eu*mentioning

confidence: 88%

“…For the three groups of zircons, the REE patterns are, in general, similar and are not further distinguished. The literature data source isDong et al, 2023b;Dong et al, 2023c.…”

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confidence: 99%

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Crustal thickness of the Jiaodong Peninsula in the Mesozoic: Implications for the destruction of the North China Craton

et al. 2023

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“…The analysis uncertainty of La is large in these methods, because minerals such as titanate, plagioclase, or apatite are fractionated before zircon [89,90]. The pressure data used in the specific calculation process are based on the average of EPMA data of amphibole and biotite from Dong et al [91]. The results show that the ΔFMQ values of the Laoshan suite are 2.43-4.22, which are significantly higher than those of the Weideshan and pre-mineralization Linglong suite (Figure 14) [11,91].…”

Section: An Oxidized Low Ba-sr Granitementioning

confidence: 99%

Petrogenesis of the Laoshan Suite in the Jiaodong Peninsula (Eastern China): An Oxidized Low Ba–Sr A1-Type Granite

Li,

Wang,

Song

et al. 2023

Minerals

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The Jiaodong Peninsula is closely related to Mesozoic granites in terms of spatial and temporal aspects. However, the specific association between the genesis of gold mineralization and these granites remains unclear. It is also ambiguous why Laoshan-type granites, which are similar to Mesozoic granites, are not gold mineralized. In this study, we analyzed the Laoshan granites and compiled Mesozoic magmatic rock data (Linglong, Guojialing, and Weideshan suites) of the Jiaodong Peninsula. We performed whole-rock major and trace elements, LA–ICP–MS zircon U–Pb geochronology and geochemistry analyses. Our zircon U–Pb data denote that the Laoshan granite was emplaced during the 118 ± 1 Ma. The Laoshan granite is characterized by high SiO2 content (76.03–80.28 wt.%), high TFe2O3/MgO (11.1–27.1) and Ga/Al (3.0–3.5) ratios, high zircon saturation temperature (809–850 °C), and negative Eu (Eu/Eu* = 0.05–0.08) anomalies, showing A-type granite characteristics. Furthermore, the Laoshan granite is identified as an A1-type granite with low Ba (33.1–42.0 ppm) and Sr (14.1–21.0 ppm) contents. It was formed in an extensional tectonic environment induced by the subducting slab roll-back of the Paleo-Pacific Plate, mainly from the partial melting of lower crustal materials, mixed with a small amount of mantle components. Zircon trace elements indicate that the Laoshan suite had relatively high oxygen fugacity and temperature (ΔFMQ = + 2.43 to + 4.22, T-Ti in zircon (mean) = 796 °C) compared to the pre-mineralization and contemporaneous mineralization magma. We propose that oxidized adakitic magma (Weideshan suite) may contribute to the enrichment and mineralization of gold. Although Laoshan-type granite also has a high oxygen fugacity, its location is distant from the ore-controlling faults, which ultimately hinders the formation of gold mineralization. From the Jurassic to the Cretaceous, the tectonic and geochemical properties of magmatic rocks in the Jiaodong Peninsula have changed, and gold deposits are formed in such a transitional process (compression to extension, reduction to oxidation).

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Metallogenetic model of Jiaodong-type gold deposits, eastern China

Deng,

Wang,

Zhang

et al. 2023

Sci. China Earth Sci.

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Possible source of Au in the Jiaodong area from lower crustal sulfide cumulates: Evidence from oxygen states and chalcophile elements contents of Mesozoic magmatic suites

Cited by 11 publications

References 65 publications

Crustal thickness of the Jiaodong Peninsula in the Mesozoic: Implications for the destruction of the North China Craton

Crustal thickness of the Jiaodong Peninsula in the Mesozoic: Implications for the destruction of the North China Craton

Petrogenesis of the Laoshan Suite in the Jiaodong Peninsula (Eastern China): An Oxidized Low Ba–Sr A1-Type Granite

Metallogenetic model of Jiaodong-type gold deposits, eastern China

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