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Batchuluun Iderbayar,Sodnom Oyungerel,김영민 한국지질과학협의회 2024 Geosciences Journal Vol.28 No.2
This study aims to determine the depositional setting and deposit type of the Ereen deposit in the Bayanjargalan soum of Dundgovi province and the Dartsagt deposit in the Dalanjargalan soum of Dornogovi province, Mongolia. Both deposits are hosted within the sediments of the Neoproterozoic Oortsog Formation. The ore-hosted Oortsog Formation consists of shale with muscovitesericite-magnetite-quartz and marbled limestone. The former is characterzid by gray to black shaly texture. Major, minor and trace elements composition of 16 ore samples of these two deposits were analyzed by XRF, ICP-MS and ICP-OES. The total iron (TFe) contents of the ore samples from the Ereen deposit range from 28.83 to 51.09 wt% with an average of 41.92 wt% whereas the TFe contents of the Dartsagt deposit from 37.61 to 49.78 wt% with an average of 43.15 wt%. In the Post-Archean Australian Shale (PAAS)-normalized REY diagram, the samples from the Ereen and the Dartsagt deposits show a weakly LREE depleted and HREE weakly enriched trend. Also, in the chondrite-normalized REY diagram, negative Eu anomaly Y-enriched trend are observed. The Eu/Eu*SN values of the Ereen deposit (0.93 to 1.25, average 1.08) and the Dartsagt deposit range from 0.93 to 1.25 (avg. 1.08) and from 1.05 to 1.61 (avg. 1.22), respectively. These trace elements characteristics indicate that these two deposits belong to the Superior-type BIF deposit formed on the passive continental margin and are not likely to be associated with volcanogenic rocks.
Kim, Yeongmin,Lee, Insung,Oyungerel, Sodnom,Jargal, Luvsanchultem,Tsedenbal, Tserenjav Elsevier 2019 Ore geology reviews Vol.104 No.-
<P><B>Abstract</B></P> <P>The copper (δ<SUP>65</SUP>Cu) and sulfur (δ<SUP>34</SUP>S) isotope compositions of ore minerals from the Erdenetiin Ovoo porphyry Cu-Mo deposit in northern Mongolia were measured. The δ<SUP>65</SUP>Cu values of Cu (I) sulfide minerals ranged from 0.14‰ to 2.69‰, suggesting that Cu predominantly originated from magmatic sources, whereas Cu (II) minerals such as chrysocolla, malachite and azurite presented much larger variations of δ<SUP>65</SUP>Cu values from −1.01‰ to 10.0‰. The small difference between the primary and secondary Cu sulfide minerals indicates an insignificant influence of Cu isotope fractionation processes during their formation, which may be explained by large mass transport and/or the involvement of biogenic activities. The δ<SUP>65</SUP>Cu values of primary chalcopyrite suggest source heterogeneity and/or the occurrence of isotope fractionation under a high-temperature environment. The positive Δ<SUB>Cu (II) mineral − Cu (I) mineral</SUB> values imply little transport of Cu in the deposit, with a rough mass balance and fast redox reaction.</P> <P>The δ<SUP>34</SUP>S values of the primary sulfide minerals (pyrite, molybdenite and chalcopyrite) clustered near 0‰, indicating that the sulfur is mainly derived from a homogeneous magmatic source. By contrast, the δ<SUP>34</SUP>S values of secondary Cu sulfide minerals ranged from −3.2‰ to −0.3‰, with an average of −1.6‰. The lower δ<SUP>34</SUP>S values are likely influenced by either S isotope fractionation processes or input of sulfur with different S isotope compositions during their formation.</P> <P>The measured δ<SUP>65</SUP>Cu and δ<SUP>34</SUP>S values of these ore minerals suggest a large mass transportation of Cu to an adjacent location, indicating little possibility of a hidden Cu occurrence in the Erdenetiin Ovoo deposit area.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We measured the δ<SUP>65</SUP>Cu and δ<SUP>34</SUP>S values of major ore minerals in the Erdenetiin Ovoo porphyry Cu-Mo deposit, northern Mongolia. </LI> <LI> We examined the Cu isotope fractionation processes among Cu minerals during their formation. </LI> <LI> We discussed the implication of Cu and S isotopic signatures on their sources and mineral exploration. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>