U-Pb Geochronology of Hydrothermal Zircons from the Early Cretaceous Iron Skarn Deposits in the Handan-Xingtai District, North China Craton

Deng, Xiao-Dong; Li, Jianwei; Wen, Guang

doi:10.2113/econgeo.110.8.2159

Cited by 59 publications

(30 citation statements)

References 59 publications

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“…Additionally, a Thermo Scientific iCAP-Q ICP-QMS, coupled with a Photon Machine G2 193 nm excimer Laser Ablation system, was used for high spatial resolution trace element determination of the same minerals at the University of Perugia, Perugia, Italy. 42 Ca, 29 Si, and 47 Ti, previously determined by electron microprobe analysis, were used as internal standards [21]. Detailed analytical methods are reported in Supplementary File S1.…”

Section: Methodsmentioning

confidence: 99%

“…Indeed, there are few possible processes could explain the origin of these zircons. These include inheritance of detrital zircons from the carbonate host rock, fluids transport of magmatic zircon from the intrusion to the metasomatic assemblage, or direct precipitation from a metasomatic fluid [46,47]. At Campiglia, there is no evidence of zircon inheritance from the host rock (lacking zircon), or transport from the granitic intrusion.…”

Section: Links Between Ree-hfse Mobilization and Fluorine Activitymentioning

confidence: 99%

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HFSE-REE Transfer Mechanisms During Metasomatism of a Late Miocene Peraluminous Granite Intruding a Carbonate Host (Campiglia Marittima, Tuscany)

et al. 2019

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The different generations of calc‐silicate assemblages formed during sequential metasomatic events make the Campiglia Marittima magmatic–hydrothermal system a prominent case study to investigate the mobility of rare earth element (REE) and other trace elements. These mineralogical assemblages also provide information about the nature and source of metasomatizing fluids. Petrographic and geochemical investigations of granite, endoskarn, and exoskarn bodies provide evidence for the contribution of metasomatizing fluids from an external source. The granitic pluton underwent intense metasomatism during post‐magmatic fluid–rock interaction processes. The system was initially affected by a metasomatic event characterized by circulation of K‐rich and Ca(‐Mg)‐rich fluids. A potassic metasomatic event led to the complete replacement of magmatic biotite, plagioclase, and ilmenite, promoting major element mobilization and crystallization of K‐feldspar, phlogopite, chlorite, titanite, and rutile. The process resulted in significant gain of K, Rb, Ba, and Sr, accompanied by loss of Fe and Na, with metals such as Cu, Zn, Sn, W, and Tl showing significant mobility. Concurrently, the increasing fluid acidity, due to interaction with Ca‐rich fluids, resulted in a diffuse Ca‐metasomatism. During this stage, a wide variety of calc‐silicates formed (diopside, titanite, vesuvianite, garnet, and allanite), throughout the granite body, along granite joints, and at the carbonate–granite contact. In the following stage, Ca‐F‐rich fluids triggered the acidic metasomatism of accessory minerals and the mobilization of high-field-strength elements (HFSE) and REE. This stage is characterized by the exchange of major elements (Ti, Ca, Fe, Al) with HFSE and REE in the forming metasomatic minerals (i.e., titanite, vesuvianite) and the crystallization of HFSE‐REE minerals. Moreover, the observed textural disequilibrium of newly formed minerals (pseudomorphs, patchy zoning, dissolution/reprecipitation textures) suggests the evolution of metasomatizing fluids towards more acidic conditions at lower temperatures. In summary, the selective mobilization of chemical components was related to a shift in fluid composition, pH, and temperature. This study emphasizes the importance of relating field studies and petrographic observations to detailed mineral compositions, leading to the construction of litho‐geochemical models for element mobilization in crustal magmatic‐hydrothermal settings.

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Section: Methodsmentioning

confidence: 99%

Section: Links Between Ree-hfse Mobilization and Fluorine Activitymentioning

confidence: 99%

HFSE-REE Transfer Mechanisms During Metasomatism of a Late Miocene Peraluminous Granite Intruding a Carbonate Host (Campiglia Marittima, Tuscany)

et al. 2019

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“…Sketch maps of (a) the North China Craton (modified after Deng et al, ) and (b) the geology of Northern Hebei Province (modified after Bao et al, ) showing the locations of the gold deposits.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Shuiquangou syenite complex contains augite hornblende syenite, hornblende syenite, augite syenite, aegirine syenite, and quartz syenite (Bao et al, 2016). Deng et al, 2015) and (b) the geology of Northern Hebei Province (modified after Bao et al, 2016) showing the locations of the gold deposits.…”

Section: Introductionmentioning

confidence: 99%

Mineral Paragenesis and Ore‐Forming Processes of the Dongping Gold Deposit, Hebei Province, China

et al. 2019

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The Dongping gold deposit is located near the center of the northern margin of the North China Craton. It is hosted in the Shuiquangou syenite and characterized by large amounts of tellurides. Numerous studies have addressed this deposit; the mineral paragenesis and ore‐forming processes, however, are still poorly studied. In this contribution, a new mineral paragenesis has been evaluated to further understand ore formation, including sulfides (pyrite, chalcopyrite, galena, sphalerite, molybdenite, and bornite), tellurides (altaite, calaverite, hessite, muthmannite, petzite, rucklidgeite, sylvanite, tellurobismuthite, tetradymite, and volynskite), and native elements (tellurium and gold). Molybdenite, muthmannite, rucklidgeite, and volynskite are reported for the first time in this deposit. We consider the Dongping gold deposit mainly formed in the Devonian, and the ore‐forming processes and the physicochemical conditions for ore formation can be reconstructed based on our newly identified ore paragenesis, that is, iron oxides → (CO2 effervescence) → sulfides → (fTe2/fS2 ratio increase) → Pb‐Bi‐tellurides → (condensation of H2Te vapor) → Au‐Ag‐tellurides → (mixing with oxidizing water) → carbonate and microporous gold → secondary minerals → secondary minerals. The logfO2 values increase from the early to late stages, while the fH2S and logfS2 values increase initially and then decrease. CO2 effervescence is the main mechanism of sulfides precipitation; this sulfidation and condensation of H2Te vapor lead to deposition of tellurides. The development of microporous gold indicates that the deposit might experience overprint after mineralization. The Dongping gold deposit has a close genetic relationship with the Shuiquangou syenite, and tellurium likely originated from Shuiquangou alkaline magmatic degassing.

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“…Hydrothermal zircons have also been reported in shearing zones, and provide a geochronometer for ductile deformation (Mueller et al ., ; Zhu & Song, ). Zircons of hydrothermal origin can be distinguished from magmatic and metamorphic zircons by their internal structure and zoning, morphology, and trace element geochemistry (Rubin et al ., ; Sinha et al ., ; Hoskin, ; Pettke et al ., ; Schaltegger et al ., ; Lawrie et al ., ; Deng et al ., ), and be used to date a hydrothermal event (Pelleter et al ., ; Ramezani et al, ).…”

Section: Introductionmentioning

confidence: 99%

U–Pb Dating of Hydrothermal Zircons from the Neoproterozoic Liushanyan VMS Cu–Zn Deposit, Central China: Evidence for a Triassic Deformation Event

Zhu

Peng

2016

Resource Geology

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The Liushanyan deposit is an important volcanic-host massive sulfide (VMS) Cu-Zn deposit in the Qinling-Tongbai-Dabie orogenic belt, central China, with reserve of 2.38 Mt Cu and 16.11 Mt Zn. Orebodies occur in the meta-quartz keratophyre of the Liushanyan formation. In this paper, we present textural features and laser ablation ICP-MS U-Pb dating results of zircons from the ore-bearing mylonitized meta-quartz keratophyre. The hydrothermal zircons are distinct from metamorphic zircons in this rock, showing low cathodoluminescence (CL) response and hydrothermal rims (black in CL images). They have relatively flat light rare earth element patterns and high La content and low (Sm/La) N and Ce/Ce* values. These features are typical of hydrothermal zircons. The cores of metamorphic zircons yield a weighted mean 206 Pb/ 238 U age of 900 ± 26 Ma, interpreted as the volcanic and related VMS mineralizing age. Two much younger events are also recorded by zircons in this rock: (i) the Early Silurian amphibolites-greenschist facies metamorphism at 435 ± 26 Ma; and (ii) the growth of hydrothermal zircons at ca. 241 ± 1 Ma, associated with the ductile shear deformation. The Silurian metamorphic event is probably associated with the arc-continent collision, while the Triassic ductile deformation event formed in the final continent-continent collision setting.

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U-Pb Geochronology of Hydrothermal Zircons from the Early Cretaceous Iron Skarn Deposits in the Handan-Xingtai District, North China Craton

Cited by 59 publications

References 59 publications

HFSE-REE Transfer Mechanisms During Metasomatism of a Late Miocene Peraluminous Granite Intruding a Carbonate Host (Campiglia Marittima, Tuscany)

HFSE-REE Transfer Mechanisms During Metasomatism of a Late Miocene Peraluminous Granite Intruding a Carbonate Host (Campiglia Marittima, Tuscany)

Mineral Paragenesis and Ore‐Forming Processes of the Dongping Gold Deposit, Hebei Province, China

U–Pb Dating of Hydrothermal Zircons from the Neoproterozoic Liushanyan VMS Cu–Zn Deposit, Central China: Evidence for a Triassic Deformation Event

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