Genesis of the Xiaolonghe quartz vein type Sn deposit, SW China: Insights from cathodoluminescence textures and trace elements of quartz, fluid inclusions, and oxygen isotopes

Cui, Xianze; Wang, Qingfei; Deng, Jun; Wu, Haiming; Shu, Qihai

doi:10.1016/j.oregeorev.2019.05.015

Cited by 12 publications

(10 citation statements)

References 64 publications

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“…12.A). Using this gradient, we obtain trapping conditions that fall within the range for FI populations related to greisen alteration and wolframite mineralization described in the literature (e.g., Williamson et al, 1997;Naumov et al, 2011, Cui et al, 2019Jiang et al, 2019). Such conditions are coherent with the emplacement of a hot granitic magma body at shallow depth, the Beauvoir granite, proposed to have occurred at ca.…”

Section: P-t Conditionssupporting

confidence: 64%

“…Greisenization is characterized by replacement of igneous minerals by various proportions of muscovite, quartz and topaz (Štemprok, 1987), ± tourmaline, apatite, HFSE-bearing minerals, to mention the most common (Pirajno, 2009). It is well established that greisen alteration is caused by magmatic-related, acidic fluids that trapped fluid inclusions (FI) showing a wide range of homogenization temperatures (Th; 200 to 450°C; e.g., Burt, 1981;Štemprok, 1987;Halter et al, 1998;Cui et al, 2019), and, in the case of rare metal granites, low salinity (<10 wt.% NaCl eq. ; Charoy, 1981 ;Cuney et al, 1992;Dobeš et al, 2005;Breiter et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

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Contrasting fluid behavior during two styles of greisen alteration leading to distinct wolframite mineralizations: The Echassières district (Massif Central, France)

Monnier

Salvi

Jourdan

et al. 2020

Ore Geology Reviews

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 Fluid cooling, without evidence of sharp pressure variations, is the main cause for one wolframite mineralization episode.  Fluid flashing (vaporization), triggered by fracture-induced pressure drops, initiated crystallization of a second type of wolframite mineralization.  Greisenization of the Beauvoir granite is a continuous process (ca. 400°C down to 190°C), occurring at high temperature as pervasive alteration of the granite body, while at lower temperature it is localized to a vein system.  Globally, greisen-forming fluids have a strong potential for transporting and precipitating W. 2  In greisen systems worldwide, regional veins distal to the altered causative magmatic body can be mineralized by greisen-forming fluids.

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Section: P-t Conditionssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Contrasting fluid behavior during two styles of greisen alteration leading to distinct wolframite mineralizations: The Echassières district (Massif Central, France)

Monnier

Salvi

Jourdan

et al. 2020

Ore Geology Reviews

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“…Greisen vein-type mineralization mainly occurs in the deposit, which is mainly manifested as greisen veins with abundant quartz, muscovite and cassiterite, and as topaz and fluorite within the XMS and XFS (Chen et al 2014(Chen et al , 2018Cao et al 2016). The hydrothermal alteration of the Xiaolonghe tin deposit is diverse and mainly includes greisenization, pyritization, silicification and carbonatization, and tin mineralization is mainly associated with greisenization (Cao et al 2016;Chen et al 2018;Cui et al 2019).…”

Section: B Deposit Geologymentioning

confidence: 99%

“…There are also abundant synchronous tin deposits, such as the Xiaolonghe and Lailishan in the Tengchong Block (Cao et al 2018). As the largest tin deposit in the Tengchong Block, the Xiaolonghe tin deposit located in the Guyong granite belt has been involved in several recent studies, which were mainly focused on the ore-forming processes and fluid evolution (Chen et al 2017(Chen et al , 2018Cui et al 2019), the geochronology of the deposit and related granites (Chen et al 2014;Zhang et al 2014;Cao et al 2016) and the genetic link between the metallogeny and magmatism (Cao et al 2016). Although the Xiaolonghe granites were considered to be related to the tin mineralization based on their geochronological and stable isotopic (C-H-O-S-Pb-He-Ar) features (Cao et al 2016;Chen et al 2018), and the geochronology and geochemical evolution of the Guyong porphyritic biotite granites were well studied (Xu et al 2012;Xie et al 2016;Zhao et al 2017b), a systematic study of the relationship and detailed magmatic process of these different granites in the Guyong granite belt is still lacking.…”

Section: Introductionmentioning

confidence: 99%

A Late Cretaceous felsic magmatic suite from the Tengchong Block, western Yunnan: integrated geochemical and isotopic investigation and implications for Sn mineralization

et al. 2020

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The Tengchong Block within the Sanjiang Tethys belt in the southeastern part of the Tibetan plateau experienced a widespread intrusion of a felsic magmatic suite of granites in its central domain during Late Cretaceous times. Here, we investigate the Guyong and Xiaolonghe plutons from this suite in terms of their petrological, geochemical, and Sr–Nd, zircon U–Pb and Lu–Hf–O isotopic features to gain insights into the evolution of the Neo-Tethys. The Guyong pluton (76 Ma) is composed of metaluminous monzogranites, and the Xiaolonghe pluton (76 Ma) is composed of metaluminous to peraluminous medium- and fine-grained syenogranite. A systematic decrease in Eu, Ba, Sr, P and Ti concentrations; a decrease in Zr/Hf and LREE/HREE ratios; and an increase in the Rb/Ba and Ta/Nb ratios from the Guyong to Xiaolonghe plutons suggest fractional crystallization of biotite, plagioclase, K-feldspar, apatite, ilmenite and titanite. They also show the characteristics of I-type granites. The negative zircon εHf(t) isotopic values (−10.04 to −5.22) and high δ18O values (6.69 to 8.58 ‰) and the negative whole-rock εNd(t) isotopic values (−9.7 to −10.1) and high initial 87Sr/86Sr ratios (0.7098–0.7099) of the Guyong monzogranite suggest that these rocks were generated by partial melting of the Precambrian basement without mantle input. The zircon εHf(t) isotopic values (−10.63 to −3.04) and δ18O values (6.54 to 8.69 ‰) of the Xiaolonghe syenogranite are similar to the features of the Guyong monzogranite, and this similarity suggests a cogenetic nature and magma derivation from the lower crust that is composed of both metasedimentary and meta-igneous rocks. The Xiaolonghe fine-grained syenogranite shows an obvious rare earth element tetrad effect and lower Nb/Ta ratios, which indicate its productive nature with respect to ore formation. In fact, we discuss that the Sn mineralization in the region was possible due to Sn being scavenged from these rocks by exsolved hydrothermal fluids. We correlate the Late Cretaceous magmatism in the central Tengchong Block with the northward subduction of the Neo-Tethys beneath the Burma–Tengchong Block.

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“…The mineralization age (71.6 ± 2.4 -73.9 ± 2.0 Ma) was defined by LA-ICP-MS cassiterite U-Pb dating (Chen et al 2014). Fluid inclusion assemblages hosted in quartz, topaz and cassiterite mostly are liquid-rich with a salinity of ∼15 wt% NaCl equiv., and a homogenization temperature of 423-450 °C (Cui et al 2019). Samples XLH, RD and DSPK were collected from the Xiaolonghe, Huangjiashan and Dasongpo mining sections, respectively.…”

Section: Cassiterite From Six Chinese Sn(-w) Depositsmentioning

confidence: 99%

Cassiterite oxygen isotopes in magmatic-hydrothermal systems: in situ microanalysis, fractionation factor, and applications

Zhang

et al. 2021

Miner Deposita

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Tin and tungsten are important metals for the industrializing society. Deciphering the origin and evolution of hydrothermal fluids responsible for their formation is critical to underpin genetic models of ore formation. Traditional approaches obtain isotopic information mainly from the bulk analysis of both ore and gangue minerals, or less frequently from in situ analysis of gangue minerals, which either bear inherited complexities and uncertainties or are indirect constraints. Hence directly obtaining isotopic information from ore minerals such as cassiterite by in situ techniques is critical, as this may significantly improve our understanding of fluid evolution and its controls on ore formation. However, this has been hampered by challenges from both analytical and applicational aspects. In this study, we first demonstrate a lack of crystallographic orientation effects during cassiterite ion microprobe oxygen isotope analysis. Along with our newly developed matrix-matched reference material, the Yongde-Cst, which has a recommended δ 18 O value of 1.36 ± 0.16 ‰ (VSMOW) as defined by Gas-Source Isotope Ratio Mass Spectrometry, in situ oxygen isotope analysis of cassiterite now is possible.We further refine the oxygen isotope fractionation (1000 ln α) for quartz-cassiterite by firstprinciples calculations, which is given by the equation of 1.259×10 6 /T 2 + 8.15×10 3 /T -4.72 (T is temperature in kelvin). The 1000 ln α for quartz-cassiterite has a sensitive response to temperature, and makes cassiterite-quartz an excellent mineral pair in oxygen isotope thermometry, as described by the equation of T (℃) = 2427 × (δ 18 Oqtz -δ 18 Ocst) -0.4326 -492.4.Using the well-established 1000 ln α of quartz-water, 1000 ln α of cassiterite-water is derived as 2.941×10 6 /T 2 -11.45×10 3 /T + 4.72 (T in kelvin), which shows a weak response to temperature. This makes cassiterite an ideal mineral from which to derive δ 18 O of fluids as robust temperature estimates are not a prerequisite. We have applied oxygen isotope analysis to cassiterite samples from six Sn(-W) deposits in China. The results show considerable variability in δ 18 O values both within a single deposit and among studied deposits. Combining the δ 18 O of cassiterite samples and the equilibrium oxygen isotope fractionation, we find that the δ 18 O values of ore-forming fluids show a strong magmatic affinity with variable but consistently low degree of involvements of meteoric water. This study demonstrates that in situ oxygen isotope analysis of cassiterite is a promising tool to refine sources of ore-forming fluids, and to decode hydrothermal dynamics controlling tin and tungsten mineralization.

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Genesis of the Xiaolonghe quartz vein type Sn deposit, SW China: Insights from cathodoluminescence textures and trace elements of quartz, fluid inclusions, and oxygen isotopes

Cited by 12 publications

References 64 publications

Contrasting fluid behavior during two styles of greisen alteration leading to distinct wolframite mineralizations: The Echassières district (Massif Central, France)

Contrasting fluid behavior during two styles of greisen alteration leading to distinct wolframite mineralizations: The Echassières district (Massif Central, France)

A Late Cretaceous felsic magmatic suite from the Tengchong Block, western Yunnan: integrated geochemical and isotopic investigation and implications for Sn mineralization

Cassiterite oxygen isotopes in magmatic-hydrothermal systems: in situ microanalysis, fractionation factor, and applications

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