Uranium-lead dating of hydrothermal zircon and monazite from the Sin Quyen Fe-Cu-REE-Au-(U) deposit, northwestern Vietnam

Timing of ore mineralization using ore mineralogy and U-Pb dating, Iron Oxide Copper Gold Sin Quyen deposit, North Vietnam

“…In general, the shape of the av er age chondrite-nor mal ized curve of REE con cen tra tion in old uraninite is sim i lar to spec tra of synmetamorphic U de posit (e.g., Kawanga, Bot swana; Mistamisk in Can ada; Mercadier et al, 2011). This nor mal ized concen tra tion curve is sig nif i cantly dif fers in shape from the REE con cen tra tion chondrite-nor mal ized curve for al la nite, gar net and zir con, pre sented in the pub li ca tion by Li et al (2018). These dif fer ences sug gested that uraninites were pre cip i tated dur ing the other stage in com par i son with the men tioned min erals, which is in good agree ment with mi cro scopic ob ser va tion (e.g., Fig.…”

“…The value of d 34 S var ies from -2.78 to +8.65‰ (Ta ble 2). Sim i lar val ues of d 34 S are noted in pub li ca tion by Li and Zhou (2018b) and Li et al (2018). Such val ues might sug gest post-mag matic hy dro thermal or i gin of sul phur which was trans ported by flu ids re spon sible for crys tal li za tion of the ore min eral as sem blage (Thode, 1991).…”

“…REE con cen tra tions in young uraninite are rel a tively high com pared to that in other ex am ples of nat u ral uraninite de scribed by Alexandre et al (2015). The 1 -af ter Gaskov et al (2012); 2 -af ter Li et al (2018); min er als in bold were de scribed by the au thors Ta ble 3 Tim ing of ore min er al iza tion in the Sin Quyen de posit (partly af ter Ta, 1975;McLean, 2001;Li et al, 2018) level of REE con cen tra tion in the Sin Quyen uraninites can be com pared to the in tru sion re lated U-de posit (Cuney and Kyser, 2008). High REE con cen tra tion is also re ported from un conformity-type min er al iza tion (Alexandre et al, 2015).…”

“…The IOCG de pos its are well-known around the world (Hitzman, 2000;Corriveau et al, 2007), but the stud ied de posit is a spe cific va ri ety in which both cop per with gold and mag netite rich ore are of eco nomic im por tance. Due to ev i dence of forma tions of both magmatism and meta mor phism orig i nat ing in the de posit re gion, the or i gin of this de posit is still dis cussed (Ta, 1975;McLean, 2001;Tran, 2007;Ishi hara et al, 2011;Pham et al, 2011;Pieczonka et al, 2015;Li and Zhou, 2018a, b;Li et al, 2018).…”

Relationship Between Some Selected Major, Minor and Trace Elements in the Iocg Deposits (On the Example of the Unique Sin Quyen Deposit, Lao Cai Province, North Vietnam)

“…The second part predominates in the western, where the major minerals are magnetite, pyrite, chalcopyrite and pyrrhotite contributing from a few percent up to 50% of ore (McLean, 2001;Gas'kov et al, 2012). Due to the occurrence of the large fractures system, the oxidized zone is clearly observed in the upper part near 100 m of depth below the earth surface ( Ta (1975) According to Li et al (2017), in the deposit region there were four principal mineralization stages: (i) the paragenetic sequence including with the sodic alteration, which was happened in the Proterozoic epoch; (ii) the calcic-potassic alteration and associated Fe-REE-(U) mineralization lasted in the Neoproterozoic (841 to 836 Ma); (iii) Cu-Au mineralization, the third stage probable happened at 500 Ma (Pieczonka et al, 2015(Pieczonka et al, , 2019 and the fourth stage was connected with the metamorphism occurred at the 30 Ma and the sulfide-(quartz-carbonate) veins were mostly established. The mineralization of the Sin Quyen deposit basically falls within the age range of the Neoproterozoic igneous rocks (740 -860 Ma) (Li et al, 2017).…”