Partial melting of subducted paleo-Pacific plate during the early Cretaceous: Constraint from adakitic rocks in the Shaxi porphyry Cu–Au deposit, Lower Yangtze River Belt

Deng, Jianghong; Yang, Xiaoyong; Li, Shuang; Gu, Huangling; Mastoi, Abdul Shakoor; Sun, Weidong

doi:10.1016/j.lithos.2016.07.039

Cited by 83 publications

(42 citation statements)

References 122 publications

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“…(Ballard et al, 2002;Liang et al, 2006;Liang et al, 2009a). Similarly, zircon trace element geochemistry from both the Wushi and Paodaoling orebearing porphyries show high zircon Ce 4+ /Ce 3+ and Eu/ Eu* values, and low temperature (T Ti in zircon ) results, indicating high oxygen fugacity and water-rich features in their magma sources, similar to other LYRB Cu-Au orebearing intermediate intrusive rocks, e.g., in the Shaxi, Tongling and Ningzhen area (Deng et al, 2016;Wang et al, 2013). Interestingly, a distinct negative correlation between Ce 4+ /Ce 3+ ratios and magma crystallization temperatures is present (Fig.…”

Section: Petrogenesis Of Magmatic Rocks In the Paodaoling District 6supporting

confidence: 52%

“…The geochemical features of normal arc magmas for the Paodaoling dacite porphyries indicate they were formed by partial melting of the overlying mantle wedge induced by slab fluids. Geochemical studies show that many LYRB ore-hosting intrusions exhibit adakitic geochemical affinities, e.g., high Sr and LREE contents, low Y and Yb contents, accompanied with high Sr/Y and La/Yb ratios (Deng et al, 2016;Li et al, 2009;Liu et al, 2010a;Wang et al, 2006;Wang et al, 2007;Wang et al, 2003;Wang Qiang et al, 2004;Xie et al, 2008;Xie et al, 2009;Xu et al, 2002;Zhang Qi et al, 2001). The Wushi ore-bearing porphyries also show adakitic geochemical affinities (Fig.…”

Section: Petrogenesis Of Magmatic Rocks In the Paodaoling District 6mentioning

confidence: 99%

“…Along the LYRB, gold usually occurs as a by-product in most gold-rich porphyry-/skarn-related Cu-Fe deposits and porphyry Cu deposits (Yang et al, 2011b), and rarely as 'Au-only' deposits. These deposits are usually associated with High-K calc-alkaline diorite to granodiorite porphyries with adakitic affinities (Deng et al, 2016;Fan et al, 2017;Hu et al, 2017;Li et al, 2014;Song et al, 2014;Wang et al, 2013;Wu et al, 2017;Xie et al, 2012;Zhang et al, 2014). The newly discovered Paodaoling Au deposit, which is located in the Anqing-Guichi ore cluster, LYRB, has been revealed by current exploration to have total Au reserves of more than 35 tons, with an average Au grade up to 1.73 g/t in the primary ore bodies, significantly higher grade than typical porphyry Au deposits (0.3 g/t to 1.5 g/t) (Cooke et al, 2005;Kerrich et al, 2000).…”

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confidence: 99%

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Mineralization, Geochemistry and Zircon U‐Pb Ages of the Paodaoling Porphyry Gold Deposit in the Guichi Region, Lower Yangtze Metallogenic Belt, Eastern China

Duan

Yang

Deng

et al. 2018

Acta Geologica Sinica (Eng)

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The newly discovered Paodaoling porphyry Au deposit from the Guichi region, Lower Yangtze River Metallogenic Belt (LYRB), contains >35 tons of Au at an average grade of ∼1.7 g/t. It is a porphyry ‘Au‐only’ deposit, as revealed by current exploration in the depths, mostly above –400 m, which is quite uncommon among coeval porphyry mineralization along the LYRB. Additionally, there are also Cu‐Au bearing porphyries and barren alkaline granitoids in the Paodaoling district. Zircon LA‐ICP‐MS U‐Pb dating of the Cu‐Au‐bearing porphyries yield an age of 141–140 Ma, falling within the main magmatic stage of the LYRB, whereas the barren granites give an age of 125–120 Ma, coeval with the regional A‐type granites. The Cu‐Au‐bearing porphyries are LILE‐, LREE‐enriched and HFSE‐depleted, typical of arc magmatic affinities. The barren granites are HFSE‐enriched, with lower LREE/HREE ratios and pronounced negative Eu anomalies. The Cu‐Au‐bearing porphyries in the Paodaoling district have high oxygen fugacities and high water content. Pyrite sulfur isotopes of the Paodaoling gold deposit indicate a magmatic‐sedimentary mixed source for the ore‐forming fluids. Based on the alteration and poly‐metal zonation of the deepest exploration drill hole from the Paodaoling Au deposit, we propose that Cu ore bodies could lie at depth beneath the current Au ore bodies. The magmatism and associated Cu‐Au mineralization of the Paodaoling district are likely to have formed in a subduction setting, during slab rollback of the paleo‐Pacific plate.

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Section: Petrogenesis Of Magmatic Rocks In the Paodaoling District 6supporting

confidence: 52%

Section: Petrogenesis Of Magmatic Rocks In the Paodaoling District 6mentioning

confidence: 99%

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Mineralization, Geochemistry and Zircon U‐Pb Ages of the Paodaoling Porphyry Gold Deposit in the Guichi Region, Lower Yangtze Metallogenic Belt, Eastern China

Duan

Yang

Deng

et al. 2018

Acta Geologica Sinica (Eng)

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“…This included precise zircon LA-ICP-MS U-Pb dating, analysis of the geochemistry of the minerals and rock, and Sr-Nd-Pb-Hf isotopic Figure 1. Geological scheme, including volcanic basins and ore cluster regions in the Middle-Lower Yangtze River Metallogenic Belt (MLYRB) (modified after [9]).…”

Section: Introductionmentioning

confidence: 99%

The Role of Magma Mixing in Generating Granodioritic Intrusions Related to Cu–W Mineralization: A Case Study from Qiaomaishan Deposit, Eastern China

Lu²,

Yang

et al. 2020

Minerals

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The newly exploited Qiaomaishan Cu−W deposit, located in the Xuancheng ore district in the MLYRB, is a middle-sized Cu-W skarn-type polymetallic deposit. As Cu-W mineralization is a rare and uncommon type in the Middle-Lower Yangtze River Belt (MLYRB), few studies have been carried out, and the geochemical characteristics and petrogenesis of Qiaomaishan intrusive rocks related to Cu-W mineralization are not well documented. We studied two types of ore-bearing intrusive rocks in the Qiaomaishan region, i.e., pure granodiorite porphyry and granodiorite porphyry with mafic microgranular enclaves (MMEs). Age characterization using zircon LA-ICP-MS showed that they were formed almost simultaneously, around 134.9 to 135.1 Ma. Granodiorite porphyries are high Mg# adakites, characterized by high-K calc-alkaline and metaluminous features that are enriched in LILEs (e.g., Sr and Ba) and LREEs, but depleted in HFSEs (e.g., Nb, Ta, and Ti) and HREEs. Moreover, they have enriched Sr-Nd-Hf isotopic compositions (with whole-rock ( 87 Sr/ 86 Sr) i ratios (0.706666−0.706714), negative ε Nd (t) values of −9.1 to −8.6, negative zircon ε Hf (t) values of −12.2 to −6.7, and two-stage Hf model ages (T DM 2) between 1.5 and 2.0 Ga). However, compared to host rocks, the granodiorite porphyry with MMEs shows variable geochemical compositions, e.g., high Mg#, Cr, Ni, and V contents and enriched with LILEs. In addition, they have more depleted I Sr , ε Nd (t), and ε Hf (t) values (0.706025 to 0.706269, −6.4 to −7.4, and −10.6 to −5.7, respectively), overlapping with regions of Early Cretaceous mafic rocks derived from enriched lithospheric mantle in the MLYRB. Coupled with significant disequilibrium textures and geochemical features of host rocks and MMEs, we propose that those rocks have resulted from mixing the felsic lower crust-derived magma and the mafic magma generated from the enriched mantle. The mixed magmas subsequently rose to shallow crust to form the ore-bearing rocks and facilitate Cu-W mineralization.

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“…Some researchers have proposed that the Paleo‐Pacific slab was initially subducted beneath the continental lithosphere of the Eurasia Plate in a mode of flat‐subduction (Li & Li, ). Recently, the quartz diorites related to the porphyry Cu mineralization in the Shaxi area, Middle‐Lower Yangtze River Belt, have been identified as products of partial melting of the subducted Paleo‐Pacific slab (Deng et al, ). This indicates that the Paleo‐Pacific slab had ever been subducted beneath the Shaxi area.…”

Section: Discussionmentioning

confidence: 99%

Geochronology and geochemistry of the Sikongshan intrusion in the Dabie Orogen, Central China: Implication for Mesozoic geodynamic background

Liu

Yan

2019

Geological Journal

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The Sikongshan (SKS) intrusion, the largest pluton situated in the Central Dabie unit of the Dabie Orogen (DBO), is composed of monzogranite and quartz diorite. A study combining whole‐rock major and trace element analysis, zircon U–Pb dating, as well as zircon in situ Lu–Hf isotopes was conducted for the SKS intrusion. Zircon dating yielded U–Pb ages of 136 ± 1.6 Ma and 134.6 ± 1.7 to 130.4 ± 1.7 Ma for quartz diorites and monzogranites, respectively, both types belonging to the early stage of the Mesozoic magmatism in the DBO. The quartz diorites exhibited high Na2O (Na2O/K2O = 1.60–1.86) and Sr (1,185–1,365 ppm) and low Y (11.6–14.2 ppm) contents, and therefore high Sr/Y (83.45–108.19) ratios. They also had high ratios of (Dy/Yb)N (48.42–54.91) and (Dy/Yb)N (1.47–1.53). The monzogranites were enriched in K2O (Na2O/K2O = 0.64–0.99) and were also characterized by low Y (5.6–14.7 ppm) contents and high Sr/Y ratios with a geochemical affinity similar to that of the adakites. However, the Sr (<358 ppm) and Al2O3 (3.31–14.92%) contents were much lower than those in typical adakites and quartz diorites. Both the quartz diorites and monzogranites had trace element signatures similar to that of continental crust with enriched levels of Rb, Ba, Th, U, and LREE and depleted levels of Nb, Ta, P, and Ti, indicating their crustal origin. Following an integrated review of these and other data from previous studies, it was concluded that the Sikongshan quartz diorite originated from the thickened lower crust of the DBO, with a composition similar to that of the Huangtuling granulite, which is the exposed lower crust of the DBO. The monzogranite was generated by plagioclase + amphibolite fractional crystallization of the adakitic Tiantangzhai melt. The adakitic rocks in the DBO originated in the western part during 143 to 134 Ma and then spread extensively throughout the whole orogen (134 to 130 Ma). The collapse of the thickened mountain root in the DBO at an extensional setting may be related to the roll‐back of the subducted Paleo‐Pacific slab.

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Partial melting of subducted paleo-Pacific plate during the early Cretaceous: Constraint from adakitic rocks in the Shaxi porphyry Cu–Au deposit, Lower Yangtze River Belt

Cited by 83 publications

References 122 publications

Mineralization, Geochemistry and Zircon U‐Pb Ages of the Paodaoling Porphyry Gold Deposit in the Guichi Region, Lower Yangtze Metallogenic Belt, Eastern China

Mineralization, Geochemistry and Zircon U‐Pb Ages of the Paodaoling Porphyry Gold Deposit in the Guichi Region, Lower Yangtze Metallogenic Belt, Eastern China

The Role of Magma Mixing in Generating Granodioritic Intrusions Related to Cu–W Mineralization: A Case Study from Qiaomaishan Deposit, Eastern China

Geochronology and geochemistry of the Sikongshan intrusion in the Dabie Orogen, Central China: Implication for Mesozoic geodynamic background

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