The origin of the mafic microgranular enclaves from Jiama porphyry Cu polymetallic deposit, Tibet: Implications for magma mixing/mingling and mineralization

Zhang, Zebin; Tang, Juxing; Tang, Pan; GuoLiang, CHEN; Zhang, Zhongkun; Gao, Xin; Yang, YANG

doi:10.18654/1000-0569/2019.03.19

Cited by 14 publications

(7 citation statements)

References 89 publications

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“…Additionally, there are minor dark diorite porphyrites of similar age. The ore district's igneous rocks were formed by magmatism in a post-Miocene collisional background (Zhang et al, 2019). Previous geochronological studies and detailed geological logging suggest an emplacement sequence for these lithologies: Quartz diorite porphyry, followed by granite Fig.…”

Section: Petrological Characteristicsmentioning

confidence: 95%

“…1-Quaternary sedimentary rock; 2-limestone and marble of the upper Jurassic Duodigou Formation; 3-sandstone, slate, and hornfel of the lower Cretaceous Linbuzong Formation; 4-granodiorite porphyry; 5-granite porphyry; 6-quartz diorite porphyry; 7-lamprophyre; 8-sampling location; 9-skarn; 10-skarn ore body; 11-borehole locations; 12-slip fault; 13-ore block; 14-section line. porphyry, monzogranite porphyry, granodiorite porphyry, and lastly dark diorite porphyry (Qin et al, 2012;Qin, 2013;Zhang et al, 2019). The first four, ranging from intermediate to felsic composition, originated from the thickened juvenile lower crust that was transformed by the underlying arc magmas during slab subduction, suggesting the evolution from cogenetic magmas (Qin, 2013).…”

Section: Petrological Characteristicsmentioning

confidence: 99%

“…The Jiama porphyry (skarn) copper deposit, positioned in the east-central part of the Gangdese belt, is among Tibet's most significant in terms of reserves, with approximately 11 million tons of copper reserves having been identified (Lin et al, 2021). Extensive studies have been conducted by both domestic and foreign scholars on its geological traits (Lin et al, 2012(Lin et al, , 2024Tang et al, 2010Tang et al, , 2011Tang et al, , 2013, metallogenic epochs (Qin, 2013;Ying et al, 2009Ying et al, , 2010, lithogeochemistry (Zhang et al, 2019;Qi et al, 2023), and the metallogenic model, regularity, and environment (Yang, 2020;Yang et al, 2020). Nevertheless, these studies largely relied on traditional whole-rock compositional analysis to constrain the origins and evolution of the Jiama deposit's metallogenic magmatic activity.…”

Section: Introductionmentioning

confidence: 99%

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Mineral Geochemistry of Apatite in the Jiama Porphyry‐Skarn Deposit, Tibet and its Geological Significance

YANG,

TANG,

ZHANG

et al. 2024

Acta Geologica Sinica (Eng)

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The Jiama deposit, a significant porphyry‐skarn‐type copper polymetallic deposit located within the Gangdese metallogenic belt in Tibet, China, exemplifies a typical porphyry metallogenic system. However, the mineral chemistry of its accessory minerals remains under‐examined, posing challenges for resource assessment and ore prospecting. Utilizing electron microprobe analysis and LA‐ICP‐MS analysis, this study investigated the geochemical characteristics of apatite in ore‐bearing granite and monzogranite porphyries, as well as granodiorite, quartz diorite, and dark diorite porphyries in the deposit. It also delved into the diagenetic and metallogenic information from these geochemical signatures. Key findings include: (1) The SiO2 content, rare earth element (REE) contents, and REE partition coefficients of apatite indicate that the dark diorite porphyry possibly does not share a cogenetic magma source with the other four types of porphyries; (2) The volatile F and Cl contents in apatite, along with their ratio, indicate the Jiama deposit, formed in a collisional setting, demonstrates lower Cl/F ratios in apatite than the same type of deposits formed in a subduction environment; (3) Compared to non‐ore‐bearing rock bodies in other deposits formed in a collisional setting, apatite in the Jiama deposit exhibits lower Ce and Ga contents. This might indicate that rock bodies in the Jiama deposit have higher oxygen fugacity. Nevertheless, the marginal variation in oxygen fugacity between ore‐bearing and non‐ore‐bearing rock bodies within the deposit suggests oxygen fugacity may not serve as the decisive factor in the ore‐hosting potential of rock bodies in the Jiama deposit.

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Section: Petrological Characteristicsmentioning

confidence: 95%

Section: Petrological Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mineral Geochemistry of Apatite in the Jiama Porphyry‐Skarn Deposit, Tibet and its Geological Significance

YANG,

TANG,

ZHANG

et al. 2024

Acta Geologica Sinica (Eng)

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“…Additionally, many valuable metals and S elements are frequently present in the deep mafic magma, and the intermediate-felsic magma receives a substantial amount of valuable metals and S elements during the mixing of the crust and the mantle, creating the material groundwork for mineralization (Zhang, 2021). In conclusion, the production of ore-bearing porphyries requires a steady supply of long-term stable deep mafic magmas and a sufficient differentiation of intermediatefelsic magma in the Jiama mining area (Richards et al, 2011;Zhang et al, 2019).…”

Section: Indication To the Evolution Of The Shallow Magma Chambermentioning

confidence: 96%

Geochronology, Geochemistry, and Implications of Aplite Dyke in the Giant Jiama Porphyry Copper System, Tibet

Tang

Lin

et al. 2023

Acta Geologica Sinica (Eng)

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Jiama is a giant, high‐grade porphyry copper system in the Gangdese metallogenic belt, Tibet. Multistage intermediate‐felsic porphyries intruded in this deposit, some of which are strongly associated with copper–polymetallic mineralization. These ore‐bearing porphyries include monzogranite, granodiorite, and quartz diorite porphyries. A new granite aplite dyke was found in the south of Jiama. Its age, genesis, and relationship with ore‐related magmatism are obscure. Here, its emplacement age and petrogenesis were determined using mineralogy, zircon U–Pb dating, geochemistry, and Sr–Nd–Pb isotope studies. The zircon LA–ICP–MS U–Pb age of the aplite dyke is 16.66 ± 0.21 Ma (n = 14, MSWD = 0.66), earlier than that of the ore‐bearing porphyries (∼15 Ma) in Jiama. Furthermore, the aplite exhibits high amounts of silicon (SiO2 = 73.39%–74.74%), potassium (K2O = 5.12%–6.61%), aluminum (Al2O3 = 14.25%–14.69%), and light/heavy rare earth elements (LREE/HREE = 12.12–16.19) as well as negative europium (δEu = 0.47–0.72) and weak negative cerium anomalies (δCe = 0.84–0.93). The aplite dyke is characteristic of metaluminous–peraluminous I‐type granite, which is rich in large‐ion lithophile elements (Rb, Ba, Th, and U) and depleted in high‐field‐strength elements (Nb, P, and Ti). The aplite dyke and ore‐bearing porphyries in the Jiama deposit are the results of a partial melting of the juvenile lower crust, according to whole‐rock geochemistry and Sr–Nd–Pb isotope data, but the dyke and ore‐bearing porphyries were emplaced from the same magma chamber at different times. Thus, the aplite dyke shows the composition of the early evolution stage of shallow magma in the Jiama deposit and is the product of rapid condensation and crystallization.

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“…In summary, we argue that the Miocene biotite monzogranite por- (Figure 12). This process would transfer H 2 O and/or some metals from the mafic magmas to the adakite-like magma (Yang et al, 2015(Yang et al, , 2016Sun et al, 2018;Zhang et al, 2019).…”

Section: Alteration Effectsmentioning

confidence: 99%

Geochemistry and zircon trace elements composition of the Miocene ore‐bearing biotite monzogranite porphyry in the Demingding porphyry Cu‐Mo deposit, Tibet: Petrogenesis and implication for magma fertility

et al. 2019

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MS zircon U-Pb dating, whole-rock geochemistry, and zircon trace elemental data for the mineralization related biotite monzogranite porphyry in Demingding. Zircon U-Pb dating shows that the weighted mean 206 Pb/ 238 U ages of the Miocene biotite monzogranite porphyry is 20.36 ± 0.46 Ma (MSWD = 2.6, n = 21). The Miocene biotite monzogranite porphyry is characterized by high SiO 2 , K 2 O, and Al 2 O 3 contents and shows adakite-like signatures. These rocks have high Sr/Y ratios, fractionated REE patterns with low HREE abundances, enrichment in LILE compared with HFSE, and have ( 87 Sr/ 86 Sr) i values of 0.7059 to 0.7062, ε Nd (t) values of −2.35 to −1.67 and (-206 Pb/ 204 Pb) i ratios of 18.50-18.55. These features are similar to other Miocene adakite-like intrusions in the Gangdese belt. We propose that the biotite monzogranite porphyry shares the same petrogenesis with other Miocene ore-bearing adakite-like intrusions in the Eastern Gangdese belt and was derived from remelting of the subduction-modified, eclogitized Tibetan lower crust and mixing with hydrous mafic magmas from metasomatized Tibetan mantle. The zircons from biotite monzogranite porphyry have only minimal negative Eu anomalies (Eu N /Eu N * > 0.3), and exhibit large ratios of Ce 4+ /Ce 3+ (average value of 113), 10,000*(Eu N /Eu N *)/Y (3.94-8.14, >1), Ce/Nd (9-58, Average value of 30), (Ce/Nd)/Y (0.008-0.127, >0.003), and low value of Dy/Yb (0.15-0.24, <0.3), indicating that the biotite monzogranite porphyry is relatively hydrous and oxidized. The biotite monzogranite porphyry, therefore, is believed to be a relatively fertile intrusion with certain exploration potential.

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The origin of the mafic microgranular enclaves from Jiama porphyry Cu polymetallic deposit, Tibet: Implications for magma mixing/mingling and mineralization

Cited by 14 publications

References 89 publications

Mineral Geochemistry of Apatite in the Jiama Porphyry‐Skarn Deposit, Tibet and its Geological Significance

Mineral Geochemistry of Apatite in the Jiama Porphyry‐Skarn Deposit, Tibet and its Geological Significance

Geochronology, Geochemistry, and Implications of Aplite Dyke in the Giant Jiama Porphyry Copper System, Tibet

Geochemistry and zircon trace elements composition of the Miocene ore‐bearing biotite monzogranite porphyry in the Demingding porphyry Cu‐Mo deposit, Tibet: Petrogenesis and implication for magma fertility

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