A genetic link between Late Cretaceous granitic magmatism and Sn mineralization in the southwestern South China Block: A case study of the Dulong Sn-dominant polymetallic deposit

Zhao, Zhenyu; Hou, Lin; Ding, Jun; Zhang, Qiming; Wu, Songhua

doi:10.1016/j.oregeorev.2017.12.020

Cited by 48 publications

(27 citation statements)

References 86 publications

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“…Other examples are, in Vietnam, the Nui Phao W deposit and granitoids (Sanematsu & Ishihara, 2011), the Tinh Túc W-Sn deposit and granitoids , and the Pha Oac granitoids (Chen et al, 2014;Roger et al, 2012). The similar ages (~90 Ma) and geochemical characteristics indicate that the formation of these granitoids, together with the mineralization, occurred during large-scale Late Cretaceous lithospheric thinning and asthenospheric upwelling (Cheng & Mao, 2010;Mao et al, 2013;Zhao et al, 2018;Figure 9b). In addition, the available evidence supports the conclusion that the remagnetization direction was mostly acquired during a single period of skarn alteration.…”

Section: 1029/2019jb018018mentioning

confidence: 95%

Magmatic‐Hydrothermal Alteration Mechanism for Late Mesozoic Remagnetization in the South China Block

et al. 2019

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Although the late Mesozoic remagnetization of the South China Block (SCB) is well recognized, the mechanism is unclear due to poor constraints on the genesis of secondary magnetic minerals. This issue is addressed via the study of the world's largest Paleozoic Mn deposit, in which both early Paleozoic sedimentation of manganese carbonate minerals and undated hydrothermal overprinting manifested by the presence of Mn silicate minerals with associated magnetite. Laser ablation-inductively coupled plasma-mass spectrometry in situ element analyses and paleomagnetic studies are applied to determine the age of hydrothermal alteration, and the results shed new light on the remagnetization mechanism of the SCB. Laser ablation-inductively coupled plasma-mass spectrometry in situ analyses show that the secondary magnetites have high values of (Ca + Al + Mn) and low values of (Ti + V) and (Ni/Cr)/Ti. This, together with coexisting skarn formation, supports a hydrothermal origin. The postfolding remagnetization is characterized by a stable component and a systematic normal polarity, carried by magnetite. The mean direction has a declination of 22.9°and an inclination of 56.1°, with a statistical parameter α 95 of 4.1°. Comparison with previously reported paleopoles indicates that the remagnetization was mostly acquired during the Late Cretaceous. Therefore, our results confirm that the hydrothermal magnetite carries a chemical remanent magnetization as a result of Late Cretaceous skarn formation. From a regional perspective, hydrothermal alteration from the Middle Jurassic to the Late Cretaceous, covering most parts of SCB, is proposed to be one of the important mechanisms for the ubiquitous late Mesozoic remagnetization.

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Section: 1029/2019jb018018mentioning

confidence: 95%

Magmatic‐Hydrothermal Alteration Mechanism for Late Mesozoic Remagnetization in the South China Block

et al. 2019

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“…The Silurian granite gives LA-ICP-MS zircon U-Pb ages of 426 to 438 Ma [27], which is exposed in the Eastern part of the study area and has been metamorphosed and deformed at ~237 Ma [28]. The Laojunshan granite forms a multi-phase pluton, defined by LA-MC-ICPMS/SHRIMP U-Pb dating of zircon and petrologic characteristics as (i) a marginal medium-to coarse-grained granite (87.5-92.9 Ma); (ii) an inner medium-to fine-grained granite (83.3-89.7 Ma); and (iii) a small stock of porphyritic granite (75.9-86.9 Ma) [21,22,24]. The Dulong Sn-Zn polymetallic deposit is located on the Southern margin of the Laojunshan granite ( Figure 1b).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Granites of phases 1 and 2 are intersected in drill holes at depth ( Figure 2b). Geochemical data suggest that these granites are highly fractionated S-type granites, which originated from the same magma and derived from partial melting of the Paleoproterozoic-Mesoproterozoic pelitic basement rocks during lithospheric thinning and asthenospheric upwelling in an intra-arc rift or back-arc extension setting [21,22,24].…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The Dulong Sn-Zn-In polymetallic deposit in the Yunnan province, Southwestern China, contains 5.0 Mt Zn, 0.4 Mt Sn, and 7 Kt In [21], and is one of the largest Sn-Zn-In deposits in South China. Previous radioisotopic dating results have shown that Sn-Zn polymetallic mineralization in the Dulong mine area is genetically related to the Late Cretaceous Laojunshan granites [21][22][23][24]. However, the Laojunshan granites form a multiphase pluton.…”

Section: Introductionmentioning

confidence: 99%

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Genesis of Dulong Sn-Zn-In Polymetallic Deposit in Yunnan Province, South China: Insights from Cassiterite U-Pb Ages and Trace Element Compositions

Liu

et al. 2021

Minerals

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: The Dulong Sn-Zn-In polymetallic deposit in the Yunnan province, SW China, hosts a reserve of 5.0 Mt Zn, 0.4 Mt Sn, and 7 Kt In. It is one of the most important polymetallic tin ore districts in China. Granites at Dulong mining area include mainly the Laojunshan granite (third phase), which occurs as quartz porphyry or granite porphyry dikes in the Southern edge of the Laojunshan intrusive complex. Granites of phases one and two are intersected at drill holes at depth. There are three types of cassiterite mineralization developed in the deposit: cassiterite-magnetite ± sulfide ore (Cst I), cassiterite-sulfide ore (Cst II) within the proximal skarn in contact with the concealed granite (granites of phases one to two and three), and cassiterite-quartz vein ore (Cst III) near porphyritic granite. Field geology and petrographic studies indicate that acid neutralising muscovitization and pyroxene reactions were part of mechanisms for Sn precipitation resulting from fluid-rock interaction. In situ U–Pb dating of cassiterite samples from the ore stages of cassiterite-sulfide (Cst II) and Cassiterite-quartz vein (Cst III) yielded Tera-Wasserburg U–Pb lower intercept ages of 88.5 ± 2.1 Ma and 82.1 ± 6.3 Ma, respectively. The two mineralization ages are consistent with the emplacement age of the Laojunshan granite (75.9–92.9 Ma) within error, suggesting a close temporal link between Sn-Zn(-In) mineralization and granitic magmatism. LA-ICPMS trace element study of cassiterite indicates that tetravalent elements (such as Zr, Hf, Ti, U, W) are incorporated in cassiterite by direct substitution, and the trivalent element (Fe) is replaced by coupled substitution. CL image shows that the fluorescence signal of Cst I–II is greater than that of Cst III, which is caused by differences in contents of activating luminescence elements (Al, Ti, W, etc.) and quenching luminescence element (Fe). Elevated W and Fe but lowered Zr, Hf, Nb, and Ta concentrations of the three type cassiterites from the Dulong Sn-Zn-In polymetallic deposit are distinctly different from those of cassiterites in VMS/SEDEX tin deposits, but similar to those from granite-related tin deposits. From cassiterite-magnetite ± sulfide (Cst I), cassiterite-sulfide ore (Cst II), to cassiterite-quartz vein ore-stage (Cst III), high field strength elements (HFSEs: Zr, Nb, Ta, Hf) decrease. This fact combined with cassiterite crystallization ages, indicates that Cst I–II mainly related to concealed granite (Laojunshan granites of phases one and two) while Cst III is mainly related to porphyritic granite (Laojunshan granites of phase three).

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“…All of these polymetallic deposits are developed around three Late Cretaceous S-type granitic batholiths that are exposed in the southeastern Yunnan ore district, including Gejiu, Bozhushan, and Laojunshan, which have been proven to be economically important ( Figure 1). Among them, the Gejiu and Laojunshan batholiths have been widely investigated and proven to be causative intrusions for the giant Gejiu and Dulong deposit, respectively [7,8]. The giant Bainiuchang deposit is about 15 km northwest of the Bozhushan batholith ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Coupled U–Pb Geochronology of Monazite and Zircon for the Bozhushan Batholith, Southeast Yunnan Province, China: Implications for Regional Metallogeny

Yan

Chen

et al. 2020

Minerals

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Constraining the duration of magmatism is of vital importance to the understanding of the magmatic-hydrothermal mineral system. The Bozhushan batholith, located in the middle section of the southeastern Yunnan ore district, mainly consists of biotite monzogranite and monzogranite. Many Sn-W-polymetallic deposits are developed around the Bozhushan batholith, but their temporal and genetic relationships remain controversial. LA-ICP-MS U-Pb zircon and monazite dating were respectively conducted on the same two samples, yielding weighted mean 206 Pb/ 238 U zircon ages of 85.1 ± 0.7 and 85.6 ± 0.9 Ma, and weighted mean 206 Pb/ 238 U monazite ages of 87.1 ± 0.9 and 88.1 ± 1.1 Ma. The crystallization ages of S-type granites obtained from the zircon U-Th-Pb system and monazite U-Th-Pb system are consistent within the analytical errors. After combining the new ages obtained in this study with recently published U-Pb zircon and cassiterite ages from the giant Baniuchang Ag-Sn-Pb-Zn deposit in the north, and U-Pb zircon and Re-Os molybdenite ages from the large Guanfang W deposit in the south, a temporal framework of magmatism-mineralization in the Bozhushan region has been established. The duration of magmatic activity at Bozhushan is about 7 Ma, with W mineralization occurring at ca. 92 Ma and Sn mineralization at 88-87 Ma.

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A genetic link between Late Cretaceous granitic magmatism and Sn mineralization in the southwestern South China Block: A case study of the Dulong Sn-dominant polymetallic deposit

Cited by 48 publications

References 86 publications

Magmatic‐Hydrothermal Alteration Mechanism for Late Mesozoic Remagnetization in the South China Block

Magmatic‐Hydrothermal Alteration Mechanism for Late Mesozoic Remagnetization in the South China Block

Genesis of Dulong Sn-Zn-In Polymetallic Deposit in Yunnan Province, South China: Insights from Cassiterite U-Pb Ages and Trace Element Compositions

Coupled U–Pb Geochronology of Monazite and Zircon for the Bozhushan Batholith, Southeast Yunnan Province, China: Implications for Regional Metallogeny

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