Geochemical and Pb-Sr-Nd isotopic compositions of granitoids from western Qinling belt: Constraints on basement nature and tectonic affinity

Zhang, Hongfei; Liu, Jin; Li, Zhang; Harris, Nigel; Zhou, Lian; Hu, Shenghong; Benren, Zhang

doi:10.1007/s11430-007-2015-3

Cited by 115 publications

(72 citation statements)

References 21 publications

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“…Pb isotopes are characterized by heavy nuclear mass and less difference of various isotopic masses, the isotopic composition unlikely been changed by external conditions, hence it has significant "fingerprint" character [65][66][67] . Because the present geological bodies are different in material sources, genetic mechanisms, formation environments and ages, the Pb isotopic compositions are various, either, which means the Pb isotope can be used as a credible tracer of material source [65] .…”

Section: Figurementioning

confidence: 99%

He-Ar isotopic system of fluid inclusions in pyrite from the molybdenum deposits in south margin of North China Block and its trace to metallogenetic and geodynamic background

et al. 2009

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The helium and argon isotopic compositions of the ore-forming fluids from the molybdenum deposits such as Jinduicheng, Donggou, Shijiawan, and Sandaozhuang, which are located in the East Qinling molybdenum belt in south margin of North China Block (SMCNB), are reported in this paper. The origin and the evolution of the ore-forming fluids and their coupled-relationships with the intra-continental collision and orogenic process of Qinling Orogen in Mesozoic-Cenozoic have been discussed. The 3 He/ 4 He and 40 Ar/ 36 Ar values ( 3 He/ 4 He=1.38-3.64 R a , and 40 Ar/ 36 Ar=295.68-346.39, respectively) of the fluid inclusions in pyrite from the molybdenum deposits in East Qinling suggest that, the ore-forming fluid system is mixed by two end members. One is the high temperature deep-derived fluid congenetic with the porphyries generated by crust-mantle mixing, and the other is the low-temperature meteoric water which is rich in crustal radiogenic He with the component of atmospheric Ar. From the Pb isotopic composition, and ore-bearing potential of the porphyry and the regional stratum, we can conclude that the ore-forming materials of the deposits in the East Qinling molybdenum belt are derived from the deep source by the mixing of lower crust and upper mantle. Therefore, the formation of the molybdenum deposits in SMNCB can be related to the crust-mantle interaction, which is accompanied by the intra-continental orogenic and extension process in the post-collision period of Qinling Orogen. The granitic porphyries which are related to Mo mineralization are not simple crust-remelting type granites or S type granites, but belong to syntexis-type or mantle-derived granites, hence their formation has a profound and regional geodynamic background. molybdenum deposits in south margin of North China Block, fluid inclusions in pyrite, He, Ar and Pb isotope, mantle fluid, metallogenetic and geodynamic background

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Section: Figurementioning

confidence: 99%

He-Ar isotopic system of fluid inclusions in pyrite from the molybdenum deposits in south margin of North China Block and its trace to metallogenetic and geodynamic background

et al. 2009

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“…The main rock-forming period of the granitoids in the WQOB is during Triassic orogenesis [18,19] , and the outcropped area of the plutons ranges from less than 1 km 2 ARTICLES GEOLOGY Figure 1 Regional geological sketch map (a) and deposit geological sketch map (b) of the Wenquan Mo deposit (after refs. [2,17]). 1, Granitic porphyry; 2, biotite granite; 3, porphyry-like granite monzonitic granite; 4, mineralized site; 5, geological boundary; 6, fault.…”

Section: Geological Characteristics Of the Wenquan Pluton And Mo Depositmentioning

confidence: 99%

“…The major minerals of the monzonitic granite are [20] : quartz 20%-30%, plagioclase 30%-35%, K-feldspar 30%-35%, biotite 2%-6%. The granodiorite is mainly composed of: quartz 15%-20%, plagioclase 30%-45%, K-feldspar 15%-30%, biotite 3%-6%, hornblende 1%-3% [2] . The mineralization of the Wenquan Mo deposit is mainly developed in the porphyry-like biotite monzo-nitic granites and granitic porphyries ( Figure 1).…”

Section: Geological Characteristics Of the Wenquan Pluton And Mo Depositmentioning

confidence: 99%

“…In the Wenquan pluton, the biotite K-Ar ages of the biotite monzonitic granite are 223-226 Ma [18] , a SHRIMP U-Pb zircon age of the granodiorite is 223±7 Ma (9 measured points, MSWD=1.4) [2] . These ages are consistent with the zircon U-Pb ages (220-205 Ma) of the Triassic granites on the south side of the Mianlue suture in error range [30] , and slightly lag behind the syn-orogenic period (242±21 Ma) of the QOB [31][32][33][34][35] , which indicates that the emplacement of the Wenquan pluton should be closely associated with the collisional event of the NCB and the SCB in the Triassic orogenesis.…”

Section: Geodynamic Background Of the Diagenesis And Mineralizationmentioning

confidence: 99%

“…Wenquan molybdenum deposit, Re-Os isotopic age, Triassic, Granite, Western Qinling Bounded by the Baoji-Chengdu railway, the Qinling Orogenic Belt (QOB) can be divided into two segments: the East Qinling Orogenic Belt (EQOB) and the West Qinling Orogenic Belt (WQOB) [1][2][3] . The Mo deposits discovered in the QOB are mainly distributed in the EQOB at the south margin of the North China Block (NCB).…”

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Ore-forming event and geodynamic setting of molybdenum deposit at Wenquan in Gansu Province, Western Qinling

et al. 2009

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ARTICLES GEOLOGY Citation: Zhu L M, Ding Z J, Yao S Z, et al. Ore-forming event and geodynamic setting of molybdenum deposit at Wenquan in Gansu Province, Western Qinling.The Wenquan molybdenum deposit is associated with a Triassic granite in this area. The Wenquan granite is enriched in LILE and LREE, poor in HFSE, and has significantly higher contents of alkali (K 2 O+Na 2 O) and Sr, Ba than those of the island arc volcanic rocks. These geochemical characteristics are similar to post-collisional granites in high K calc-alkaline series. Studies of major elements, trace elements, REEs and chronology of the Wenquan pluton show that, in the geodynamic transition stage of continent-continent convergence to extension, the partial melting of the enriched lithospheric mantle generated the basaltic magma and triggered the partial melting of the thickened lower crust which produceded the acidic magma, and the Wenquan pluton was formed by mixing of the two magmas. Molybdenite Re-Os isotopic dating gave Os model ages of 212.7±2.6 Ma to 215.1±2.6 Ma with a weighted mean of 214.1±1.1 Ma, and an Re-Os isochron age of 214.4±7.1 Ma. These ages are close to K-Ar ages (223 to 226 Ma) and a SHRIMP zircon U-Pb age (223±7 Ma) for the Wenquan granite within the error range, but relatively younger. This implies that the Mo mineralization occurred in a late stage of the magmatic intrusion, and the metallogenesis took place in the transition stage from syn-collision to post-collision in the tectonic setting of the Qinling Orogenic Belt (QOB) after continental collision between the North China Block (NCB) and the South China Block (SCB). This process is also corresponding to the geological events of metamorphism and deformation in South Qinling, closure of the Mian-Lue oceanic basin, and exhumation of the Dabie-Sulu ultrahigh-pressure metamorphic rocks. The large-scale continent-continent collision between NCB and SCB in the middle Triassic triggered significant crustal thickening and exhumation of subducted slab. In the late Triassic, the tectonic setting was transformed to the transition stage from collision to extension. Materials from the asthenospheric mantle would ascend into the root of the lower crust, which could induce partial melting of the lower crust and generate Mo-enriched granitic magma. The ore-forming elements enriched in the fluid derived from the condensation and fraction of the magma resulted in the Mo mineralization. The Mo deposits in the QOB are mainly formed in two episodes, namely 220± Ma and 140± Ma. The two episodes of metallogenesis were developed in the tectonic transition settings from compression to extension, but they were in the different stages of the tectonic evolution. The occurrence of the Wenquan Mo-bearing pluton indicates that the Triassic tectonic-magmatic belt of Western Qinling is another favorable region for

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Pb isotope compositions of detrital K‐feldspar grains in the upper‐middle Yangtze River system: Implications for sediment provenance and drainage evolution

Zhang

Tyrrell

Chang-an

et al. 2014

Geochem Geophys Geosyst

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The upper-middle Yangtze River drains the Qiangtang Block, the Songpan-Ganzi, the Yangtze Craton, and the Qinling-Dabie orogenic belt. These tectonic units have been shown to have heterogeneous Pb isotopic compositions, which allow this isotope system to be used as a sediment provenance tool. In this study we have employed laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) to measure Pb isotope compositions of sand-sized K-feldspar grains from the upper-middle Yangtze River. Data are presented from four major tributaries: Yalongjiang, Minjiang, Jialingjiang, and Hanjiang, as well as from the main Yangtze River near Yichang. A portion of K-feldspar grains in the Yalongjiang shows an ultraradiogenic character ( 206 Pb/ 204 Pb > 20), which is unique in the upper-middle Yangtze. Moreover, these ultraradiogenic grains were transported as far as Yichang, just downstream from the Three Gorges, suggesting that the Pb-in-K-feldspar method could be applied to the sediments within the Jianghan Basin to date the formation of the Three Gorges. Pb isotopic data from Yichang indicate that erosion in the Longmen Shan and neighboring regions is more important than the Jinshajiang in supplying sediment. The grains in Hanoi Basin have little overlap with the Songpan-Ganzi, but show a good match with the Yangtze Craton in its range of lower 206 Pb/ 204 Pb ratios. These observations support the idea that the ''Middle Yangtze'' used to be a tributary of the paleo-Red River and that there has been no drainage linking the SongpanGanzi and the Red River since the Eocene.

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Geochemical and Pb-Sr-Nd isotopic compositions of granitoids from western Qinling belt: Constraints on basement nature and tectonic affinity

Cited by 115 publications

References 21 publications

He-Ar isotopic system of fluid inclusions in pyrite from the molybdenum deposits in south margin of North China Block and its trace to metallogenetic and geodynamic background

He-Ar isotopic system of fluid inclusions in pyrite from the molybdenum deposits in south margin of North China Block and its trace to metallogenetic and geodynamic background

Ore-forming event and geodynamic setting of molybdenum deposit at Wenquan in Gansu Province, Western Qinling

Pb isotope compositions of detrital K‐feldspar grains in the upper‐middle Yangtze River system: Implications for sediment provenance and drainage evolution

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