Fluid evolution and ore genesis of the Dalingshang deposit, Dahutang W-Cu ore field, northern Jiangxi Province, South China

Peng, Ning-Jun; Jiang, Shao‐Yong; Xiong, Suo‐Fei; Pi, Dao-Hui

doi:10.1007/s00126-018-0796-2

Cited by 27 publications

(6 citation statements)

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“…It clearly testifies for a cooling process, which may be critical during the syn-ore stage in the Shangfang W deposit. Similar variation also can be observed in the giant Dahutang W deposits [5]. The lower salinity and homogenization temperature of the calcite indicts its fluid inclusions should be captured after deposition of scheelite and quartz (Figure 9).…”

Section: Evolution Of Ore-forming Fluidssupporting

confidence: 73%

“…All the peaks of granite magmatism coeval with three bursts of Sn-W, which formed three large-scale metallogenic provinces, named the Southeastern Coastal Metallogenic Belt, Nanling Region, and the Jiangnan Orogen. And these metallogenic provinces reserve the mass large W deposits of the South China Block [3,5,6,[19][20][21]. Not only the spatial and temporal distribution, but also the type of granite displays a series of variation due to the transition of the Pacific plate subduction [22][23][24].…”

Section: Regional Geologymentioning

confidence: 99%

“…Recently several granite-related large-scale W-Cu and W-Mo deposits (WO 3 : more than 5.0 million tons) have been discovered in the Jiangnan Orogen, which is located in the southeast margin of Yangtze Craton, and to the south part of Middle-Lower Yangtze River Valley. Several dating results have demonstrated that 150-130 Ma is the main mineralization epoch for these newly discovered world-class tungsten deposits (e.g., Dahutang), in which the W ore mostly occurs as veinlet or dissemination in granite and granite-granodiorite porphyries [5,6]. The Southeastern Coastal Metallogenic Belt is located at the continental margin of Eurasia, and is adjacent to the southeast of the Nanling Range Metallogenic Belt.…”

Section: Introductionmentioning

confidence: 99%

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Origin of the Shangfang Tungsten Deposit in the Fujian Province of Southeast China: Evidence from Scheelite Sm–Nd Geochronology, H–O Isotopes and Fluid Inclusions Studies

et al. 2019

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The Shangfang deposit is a recently discovered large-scale tungsten deposit (66,500 t at 0.23% WO3), which is located near the western boundary of the Southeastern Coastal Metallogenic Belt (i.e., Zhenghe–Dafu fault), and adjacent to the northeast of the Nanling Range Metallogenic Belt. Unlike many other W–Sn deposits in this region that occur within or near the granites, the orebodies in the Sangfang deposit all occur within the amphibolite of Palaeoproterozoic Dajinshan Formation and have no direct contact to the granite. In this study, we carry out a thermal ionization mass spectrometer (TIMS) Sm-Nd isotope analysis for the scheelites from the orebody, which yields a Sm–Nd isochron age of 157.9 ± 6.7 Ma (MSWD = 0.96). This age is in good agreement with the previously published zircon U–Pb age (158.8 ± 1.6 Ma) for the granite and the molybdenite Re–Os age (158.1 ± 5.4 Ma) in the deposit. Previous studies demonstrated that the W–Sn deposits occurring between Southeastern Nanling Range and Coastal Metallogenic Belt mainly formed in the two periods of 160–150 Ma and 140–135 Ma, respectively. The microthermometry results of fluid inclusions in scheelite and quartz are suggestive of a near-isothermal (possibly poly-baric) mixing between two fluids of differing salinities. The H–O isotope results illustrate that the ore-forming fluids are derived from magma and might be equilibrated with metamorphic rocks at high temperature. The Jurassic granite pluton should play a critical role for the large hydrothermal system producing the Shangfang W deposit. Furthermore, the negative εNd(t) of −14.6 obtained in the Shanfang scheelite suggests for the involvement of the deep crustal materials. In general, subduction of the paleo-Pacific plate caused an extensional tectonic setting with formation of the Shangfang granites and related W mineralization, the geological background of which is similar to other W deposits in the Nanling Range Metallogenic Belt.

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Section: Evolution Of Ore-forming Fluidssupporting

confidence: 73%

Section: Regional Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Origin of the Shangfang Tungsten Deposit in the Fujian Province of Southeast China: Evidence from Scheelite Sm–Nd Geochronology, H–O Isotopes and Fluid Inclusions Studies

et al. 2019

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“…Plagioclase could release a large amount of Eu 2+ during hydrothermal alteration such as sericitization (Campbell et al ., 1984; sverjensky, 1984; Bence and Taylor, 1985), resulting in Eu enrichment. A similar situation also occurs in the Dalingshan deposit and Shiweidong deposit (Peng et al ., 2018; Cao et al ., 2020).…”

Section: Discussionmentioning

confidence: 99%

The ore‐forming fluids characteristics of quartz‐vein type scheelite deposits in eastern Yanbian, NE China: Evidence from in situ LA‐ICP‐MS rare earth elements of Yangjingou and Sidaogou deposits

Ren

Hao

et al. 2022

Resource Geology

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The quartz‐vein type scheelite deposits distributed in the Hunchun SN‐trending gold‐copper‐tungsten belt in eastern Yanbian, Jilin Province, are a group of recent discovery for the past decade. To determine properties of the ore‐forming fluids and the mineralization mechanism, in situ laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) rare earth elements (REE) analysis of the ore mineral scheelite was carried out for the selected Yangjingou and Sidaogou scheelite deposits in this metallogenic belt. The results showed that the substitution of REE3+ for Ca2+ in scheelite from the Yangjingou scheelite deposit can be accounted for the substitution mechanism: 3Ca2+ = 2REE3+ + □Ca (where □ is a site vacancy). It shows a slightly right‐dipped flat REE pattern with distinct positive Eu anomalies. The Sidaogou scheelite deposit, completes the substitution via the 2Ca2+ = REE3+ + Na+ and Ca2+ + W6+ = REE3+ + Nb5+ mechanisms. It shows left‐dipped REE pattern with relative enrichment of MREEs (mainly Dy) with negative Eu anomalies in the scheelite core and no or insignificant positive Eu anomalies in the scheelite rim. By comparing with the REE of granites which are close related to mineralization in the area, the ore‐forming fluids of these two scheelite deposits are determined to be mainly derived from magmatism. The inapparent correlation between EuN and Eu*N of the Yangjingou scheelite deposit and the high EuN/Eu*N values indicate that its ore‐forming fluids are reducing fluids. Its strong positive Eu anomalies are not entirely inherited from the mineralized tonalite, but is due to the release of Eu from the water‐rock reaction. The good correlation between EuN and Eu*N and the low EuN/Eu*N values in the Sidaogou scheelite deposit indicate that the ore‐forming fluids are oxidizing fluids. This may be caused by the mixing of the original magmatic fluid with a large amount of meteoric water. This study suggests that the water‐rock reaction is an important mineralization mechanism for the quartz vein‐type scheelite deposits in eastern Yanbian. In addition, fluid mixing is also important for the Sidaogou scheelite deposit. All these mechanisms influence the REE compositional characteristics of scheelite. The initial ore‐bearing fluids metasomatized the metamorphic rocks of Wudaogou Group, resulting in water‐rock reaction, and enriched ore‐forming materials such as Ca and W. As the ore‐forming fluids migrated upward along the NW‐trending structures, the escape of CO2 and CH4 caused by the tectonic decompression disrupted the physiochemical balance of the ore‐forming fluid system, catalyzed the combination of Ca2+ and WO42−, resulting in the precipitation and enrichment of the scheelite.

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“…Since the 1980s, the invention of infrared microscopy provided a window for investigating the internal structure and fluid inclusions in opaque ore minerals (Campbell et al, 1984). Subsequently, a series of research works have been carried out on wolframitehosted fluid inclusions used to directly characterize the ore -forming fluids (Campbell and Robinson, 1987;Campbell and Panter, 1990;Lueders, 1996;Rios et al, 2003;Ni et al, 2015;Chen et al, 2018;Li et al, 2018b;Peng et al, 2018;Pan et al, 2019;Peng et al, 2020). In recent years, the application of LA-ICP-MS analysis of single fluid inclusions (Günther et al, 1998;Heinrich et al, 2003) has provided a new perspective for the study of ore-forming fluids and metallogenic mechanisms (e.g., Audétat et al, 1998;Ulrich et al, 1999;Heinrich et al, 2004;Wilkinson et al, 2009;Su et al, 2009;Large et al, 2016).…”

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confidence: 99%

Ore‐forming Fluid and Metallogenic Mechanism of Wolframite–Quartz Vein‐type Tungsten Deposits in South China

Pan

2020

Acta Geologica Sinica (Eng)

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South China is endowed with copious wolframite–quartz vein‐type W deposits that provide a significant contribution to the world's tungsten production. Mineralization is spatially associated with highly evolved granites, which have been interpreted as products of ancient crustal anatexis. Ore veins are mainly hosted in low‐grade metamorphosed quartz sandstone, slate and granitic rocks. The ore minerals mainly comprise wolframite, cassiterite, scheelite and pyrite, with minor molybdenite, arsenopyrite and chalcopyrite. Typical steeply dipping veins can be divided into five zones from top to the bottom, namely: (I) thread, (II) veinlet, (III) moderate vein, (IV) thick vein, and (V) thin out zones. In general, three types of fluid inclusions at room temperature are commonly recognized in wolframite and/or quartz from these veins: two‐phase liquid‐rich (type L), two‐phase CO2‐bearing (type CB), and CO2‐rich (type C). Comparative microthermometry performed on fluid inclusions hosted in wolframite and associated quartz indicates that most wolframite was not co‐precipitated with the coexisting quartz. Detailed petrographic observation and cathodoluminescence (CL) imaging on coexisting wolframite and quartz of the Yaogangxian deposit, show repeated precipitation of quartz, wolframite, and muscovite, suggesting a more complex fluid process forming these veins. Previous studies of H‐O isotopes and fluid inclusions suggested that the main ore‐forming fluids forming the wolframite–quartz vein‐type deposits had a magmatic source, whereas an unresolved debate is centered on whether mantle material supplemented the ore‐forming fluids. The variable CO2 contents in the ore‐forming fluids also implies that CO2 might have had a positive effect on ore formation. Fluid inclusion studies indicate that wolframite was most likely deposited during cooling from an initial H2O + NaCl ± CO2 magmatic fluid. In addition, fluid‐phase separation and/or mixing with sedimentary fluid might also have played an important role in promoting wolframite deposition. We speculate that these processes determine the precipitation of W to varying degrees whereas the leading mechanistic cause remains an open question. Comprehensive studies on spatial variation of fluid inclusions show that both the steeply and gently dipping veins are consistent with the “five floors” model that may have broader applications to exploration of wolframite–quartz vein‐type deposits. Recent quantitative analysis of wolframite‐ and quartz‐hosted fluid inclusions by laser ablation inductively‐coupled plasma mass spectrometry shows enhanced advantages in revealing fluid evolution, tracing the fluid source and dissecting the ore precipitation process. Further studies on wolframite–quartz vein‐type W deposits to bring a deeper understanding on ore‐forming fluids and the metallogenic mechanism involved.

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Fluid evolution and ore genesis of the Dalingshang deposit, Dahutang W-Cu ore field, northern Jiangxi Province, South China

Cited by 27 publications

References 50 publications

Origin of the Shangfang Tungsten Deposit in the Fujian Province of Southeast China: Evidence from Scheelite Sm–Nd Geochronology, H–O Isotopes and Fluid Inclusions Studies

Origin of the Shangfang Tungsten Deposit in the Fujian Province of Southeast China: Evidence from Scheelite Sm–Nd Geochronology, H–O Isotopes and Fluid Inclusions Studies

The ore‐forming fluids characteristics of quartz‐vein type scheelite deposits in eastern Yanbian, NE China: Evidence from in situ LA‐ICP‐MS rare earth elements of Yangjingou and Sidaogou deposits

Ore‐forming Fluid and Metallogenic Mechanism of Wolframite–Quartz Vein‐type Tungsten Deposits in South China

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