The Cu-Ni mineralization potential of the Kaimuqi mafic-ultramafic complex and the indicators for the magmatic Cu-Ni sulfide deposit exploration in the East Kunlun Orogenic Belt, Northern Qinghai-Tibet Plateau, China

Liu, YueGao; Chen, ZhengGuo; Li, Wenyuan; Xu, Xunhui; Kou, Xin; Jia, Qunzi; Zhang, Zhaowei; Liu, Fang; Wang, Yalei; Minxin, You

doi:10.1016/j.gexplo.2018.12.002

Cited by 25 publications

(6 citation statements)

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“…Terrane from north to south (Li et al, 1987;Pan et al, 2006;Xu et al, 2011;Zhang et al, 2017;Liu et al, 2018Liu et al, , 2019 (Fig 1b). By its basement properties, the Lhasa Terrane (Gangdese Belt) can also be separated from north to south by the Shiquanhe-Namu Tso ophiolite mélange Fault (SNMF) and the Luobadui-Milashan Fault (LMF) into the North Lhasa Terrane (NL), Central Lhasa Terrane (CL), and South Lhasa Terrane (SL) (Zhu et al, 2009(Zhu et al, , 2011(Zhu et al, , 2013).…”

Section: Geological Backgroundmentioning

confidence: 99%

Zircon U-Pb Geochronology, Hf Isotope, and Petrochemical Characteristics of Paleocene Granitoids in Western Gangdese Belt, Tibet

2020

GiG

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The research team studied the petrology, whole-rock geochemistry, zircon U-Pb age, and stable isotopic characteristics of the Nuocang area Rongguolongba and Garongcuo granites to better understand the impact of Neo-Tethys ocean subduction and India-Eurasia continental collision on Paleocene tectono-magmatic processes along the southern margin of the Gangdese Belt. Rongguolongba granite and Garongcuo granite porphyry were formed 61.86 Ma and 62.17 Ma, respectively. Nuocang granitoids are characterized by: 1) high SiO 2 , NaO 2 , and Al 2 O 3 content-but low FeO T , MgO, and TiO 2 content; 2) LREE and LILE enrichment-but HREE and HFSE (Nb, P, and Ti) depletion; 3) obvious negative Eu abnormalities. These features indicate that Nuocang granites are of the high-K cacl-alkaline and peraluminous granite types. Furthermore its zircon Hf isotope characteristics suggest that the magma source region has an ancient crystalline basement. The basaltic andesitic crystal tuff is the product of garnet-peridotite partial melting and crust contamination from rising magma emplacement.

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Section: Geological Backgroundmentioning

confidence: 99%

Zircon U-Pb Geochronology, Hf Isotope, and Petrochemical Characteristics of Paleocene Granitoids in Western Gangdese Belt, Tibet

2020

GiG

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“…The EKOB belongs to the Tethys tectonic domain, which has an extremely complicated geological history [16][17][18][19]. The evolution of the Proto-Tethys began in the Precambrian and ended in the Devonian, during which the ocean basin was subducted in both directions, creating the basic tectonic framework of the EKOB [20,21].…”

Section: Regional Geologymentioning

confidence: 99%

“…Thus, the discovery of the Gayahedonggou deposit indicates that a Cu-Ni metallogenic belt spans 800 km in the EKOB. Liu et al (2019a) summarized that the large Cu-Ni deposit in the EKOB shares the following characteristics: (1) the mafic-ultramafic complexes have a broader range of m/f values (m/f max − m/f min > 2.5) and higher m/f values (m/f max > 5.5); (2) the pyroxene in the intrusion is mainly orthopyroxene; and (3) the olivine and the clinopyroxene in mineralized intrusions contain low contents of FeO and CaO [17]. The highest m/f ratio is 3.75 in the Gayahedonggou complex, which is much lower than 5.5.…”

Section: Cu-ni Mineralization Potentialmentioning

confidence: 99%

Tectonomagmatic Setting and Cu-Ni Mineralization Potential of the Gayahedonggou Complex, Northern Qinghai–Tibetan Plateau, China

Norbu

Liu

et al. 2020

Minerals

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The Gayahedonggou magmatic Cu-Ni sulfide deposit was recently discovered in the East Kunlun orogenic belt (Northern Tibetan Plateau, China). The mineralization in this region is associated with mafic–ultramafic intrusions. To date, the formation age and metallogenic model of these ore-bearing intrusions have not been studied systematically. In this paper, the petrology, zircon U-Pb chronology, and geochemistry of ore-bearing wehrlite and quartz diorite are investigated. The results show that the zircon U-Pb isotopic age of wehrlite is 419.9 ± 1.5 Ma with an average εHf(t) value of 3.0, indicating that wehrlite originated from a depleted mantle or the asthenosphere. The (La/Yb)N, (La/Sm)N, (Gd/Yb)N, Nb/U, and Ce/Pb ratios of wehrlite are between 3.01–7.14, 1.69–3.91, 1.36–1.51, 2.07–2.93, and 0.55–1.42, respectively, indicating that the parent magma of the wehrlite had been contaminated by the upper crust. The zircon U-Pb isotopic age of quartz diorite is 410.2 ± 3.5 Ma with an average εHf(t) value of 8.0, and the A/CNK and A/NK ratio of quartz diorites ranges from 1.02 to 1.04 and from 2.13 to 2.23, respectively. These features are similar to those of the type I granite, and the quartz diorite was likely derived from the lower crust. Combined with the regional geological evolution, the Gayahedonggou complex formed in a post-collision extensional environment. The pyroxene in the Gayahedonggou complex is mainly clinopyroxene, which is enriched in the CaO content, indicating that the CaO content of the parent magma of the Gayahedonggou complex is high or that the complex has been contaminated by Ca-rich surrounding rocks, which hinders Cu-Ni mineralization.

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“…Many porphyry-skarn deposits have been discovered and explored in this area (e.g., the Kaerqueka Cu-Mo porphyry deposit, Hutouya Cu-Pb-Zn skarn deposit, and Galinge Fe skarn deposit [9][10][11][12][13]). Many publications have focused primarily on the geochemistry of the granite [14][15][16][17][18] and on the description of the geological characteristics of typical deposits and their host rocks [19][20][21]. The mineralization age has also been investigated, yielding Re-Os dates of 226.5 ± 5.1 Ma [9] for the Shuangqing Fe deposit and 236.2 ± 2.1 Ma [22] for the Shenduolong Pb-Zn polymetallic deposit.…”

Section: Introductionmentioning

confidence: 99%

Fluid Inclusions and S–Pb Isotopes of the Reshui Porphyry Mo Deposit in East Kunlun, Qinghai Province, China

et al. 2019

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The Reshui porphyry Mo deposit is located in the East Kunlun orogenic belt (EKOB). Molybdenum mineralization is distributed in monzogranite and porphyritic monzogranite rocks, mainly presenting as various types of hydrothermal veinlets in altered wall rocks, and the orebodies are controlled by three groups of fractures. In this paper, we present the results of fluid-inclusion and isotopic (S and Pb) investigations of the Reshui Mo deposit. The ore-forming process of the deposit can be divided into three stages: an early disseminated molybdenite stage (stage 1), a middle quartz–molybdenite stage (stage 2) and a late quartz–polymetallic sulfide stage (stage 3). The alteration was mainly potassic and silicic in stage 1, silicic in stage 2, and sericitic and silicic in stage 3. Five types of fluid inclusions (FIs) can be distinguished in quartz phenocrysts and quartz veins, namely W, PL (pure liquid inclusions), PV (pure gas inclusions), C (CO2 three-phase inclusions), and S (daughter mineral-bearing inclusions). The homogenization temperatures of fluid inclusions belonging to stages 1 to 3 are 282.3–378 °C, 238.7–312.6 °C and 198.3–228 °C, respectively. The fluid salinities at stages 1 to 3 are 4.65–8.14% NaCl eq., 4.34–42.64% NaCl eq., and 3.55–4.65% NaCl eq., respectively. The fluids of this deposit were generally moderate–high temperature and moderate–low salinity and belong to the H2O–NaCl–CO2 ± CH4 system. The temperature and pressure changed considerably between stage 2 (high–medium-temperature) and stage 3 (low-temperature). The evidence for ore-forming fluids containing different types of coexisting inclusions in stage 2 and a decrease in the fluid temperature from stage 2 to stage 3 indicate that fluid boiling and fluid mixing were the main mechanisms of ore precipitation. The sulfide 34SV-CDT values range from 4.90‰ to 5.80‰, which is characteristic of magmatic sulfur. The 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb values of the ore minerals are 18.210–18.786, 15.589–15.723, and 38.298–39.126, respectively. These lead isotopic compositions suggest that the ores were mainly sourced from crustally derived magmas, with minor input from the mantle. The fluid inclusions and S–Pb isotopes provide important information on the genesis of the Reshui porphyry Mo deposit and indicate that the Triassic has high metallogenic porphyry potential in the EKOB.

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The Cu-Ni mineralization potential of the Kaimuqi mafic-ultramafic complex and the indicators for the magmatic Cu-Ni sulfide deposit exploration in the East Kunlun Orogenic Belt, Northern Qinghai-Tibet Plateau, China

Cited by 25 publications

References 62 publications

Zircon U-Pb Geochronology, Hf Isotope, and Petrochemical Characteristics of Paleocene Granitoids in Western Gangdese Belt, Tibet

Zircon U-Pb Geochronology, Hf Isotope, and Petrochemical Characteristics of Paleocene Granitoids in Western Gangdese Belt, Tibet

Tectonomagmatic Setting and Cu-Ni Mineralization Potential of the Gayahedonggou Complex, Northern Qinghai–Tibetan Plateau, China

Fluid Inclusions and S–Pb Isotopes of the Reshui Porphyry Mo Deposit in East Kunlun, Qinghai Province, China

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