Mineral chemistry and isotope geochemistry of pyrite from the Heilangou gold deposit, Jiaodong Peninsula, Eastern China

Abstract

a b s t r a c tThe Heilangou gold deposit is located in the northern QixiaePenglai gold belt, which is one amongst the three large gold belts in the eastern Shandong Province (Jiaodong Peninsula). The ore body has formed within the Guojialing granite. In this study, we report the mineral chemistry of pyrite, as well as the S, Pb, and HeO isotope data of the Heilangou gold deposit. The chemical composition of pyrite in the Heilangou gold deposit indicates that the associated gold deposit is a typical magmatic hydrothermal one. The geochemical signatures and crystal structure of pyrite show that the ore-forming materials have been derived from the crust. The S isotope data of the pyrites from Heilangou show an overall range from 5.5 to 7.8& and an average of 6.7&. The S isotope data in this deposit are similar to those from the deposits in the Jiaodong gold belt. The Pb and S isotope variations are small in the Heilangou gold deposit. The 206 Pb/ 204 Pb, 207 Pb/ 204 Pb and 208 Pb/ 204 Pb ratios are 17.4653e17.5958, 15.5105e15.5746 and 38.0749e38.4361, respectively. These data plot between the lower crust and the orogenic belt. The Pb isotope data in the Heilangou gold deposit are similar to those in the Linglong gold deposit. From the Qixia gold area (the Liukou and Majiayao gold deposits) to the MupingeRushan gold belt (Rushan gold deposit) to the ZhaoeYe gold belt (the Linglong, Sanshandao and Jiaojia gold deposits), the 206 Pb/ 204 Pb ratios progressively increase. The DeO isotope data obtained from quartz separates suggest that the ore-forming fluid was similar to a mixture of magmatic and meteoric waters. These results suggest that the ore-forming elements were primarily from source fluids derived from the lower crust.

Metallogenic mechanism of the Houge’zhuang gold deposit, Jiaodong, China: Evidence from fluid inclusion, in situ trace element, and sulfur isotope compositions

“…The in situ sulfur isotope values of pyrite measured in the present study were relatively stable, with a narrow variation (δ 34 S CDT = ~5.51-7.95‰), showing a tower effect and a positive deviation from meteorite sulfur, similar to the other deposits in Jiaodong (Hou et al, 2007a;Yan et al, 2014;Wang et al, 2015;Wen et al, 2016;Feng et al, 2018;Yang et al, 2018;Chai et al, 2020b).…”

“…In the gold field, the widely distributed magmatic rocks are Early Cretaceous Guojialing granodiorite, which is the main host for the Au-bearing quartz veins (Hou et al, 2004;Yan et al, 2014). The gold deposit is surrounded by basic-intermediate to felsic dikes, such as lamprophyre, diorite porphyrite, and granite porphyry, among others.…”

“…Previous studies on the gold deposits in the Jiaodong area have primarily focused on the petrology, geochronology, elemental and isotopic geochemistry, and structure, among others; however, the factors controlling the high-grade gold mineralization and the origin and relevant implication for transportation and deposition of gold remain controversial (Hou et al, 2006;Hou et al, 2007a;Goldfarb and Santosh, 2014;Yan et al, 2014;Li et al, 2015;Song et al, 2015;Zhu et al, 2015;Deng et al, 2017;Deng et al, 2018).…”

Nature and geochemical characteristics of ore-forming fluids in the Zhaoxian gold deposit, Jiaodong gold province, eastern China

“…Liaoshang, Tudui, and Shawang) (Li et al, 2017). Many previous studies have analyzed the source and properties of ore-forming fluids of the Jiaodong gold deposits, with the main findings include: 1) the ore-forming fluids have had input from the mantle (Deng et al, 2015;Liang et al, 2015), magmatic water (Zhao et al, 2015;Zhang et al, 2017), and a mixture of metamorphic-hydrothermal fluids and meteoric water (Xu et al, 2016;Tan et al, 2018); 2) the ore-forming fluids likely changed from early-stage medium-high temperature and medium-low salinity to late-stage medium-low temperature and low salinity (Wang et al, 2014;Yan et al, 2014;Deng et al, 2015;Yang et al, 2017); 3) the ore-forming materials may have sourced from the mantle, Yanshanian (Jurassic-Cretaceous) granites, and Yanshanian (Jurassic-Cretaceous) granite-greenstone (Zhou et al, 2000;Zhang et al, 2014;Deng et al, 2015;Yang et al, 2016b). However, some workers argued that ore-forming fluids of the different ore types are not very different, and the physicochemical properties and interpreted ore-fluid sources are largely the same.…”

Ανάσχεση Προόδου Όξινης Απορροής Σε Θειούχα Ορυκτά Με Χρήση Φωσφορικών Και Πυριτικών Επικαλύψεων

“…Αποτελεί δευτερεύουσα ορυκτολογική φάση σε όλα τα γεωλογικά περιβάλλοντα με κυριότερα παραδείγματα τις υδροθερμικές φλέβες των πυριγενών πετρωμάτων σε παραγένεση με άλλες θειούχες φάσεις, όπως ο γαληνίτης (PbS), ο σφαλερίτης (ZnS), ο μαρκασίτης (FeS 2 ), ο χαλκοπυρίτης (CuFeS 2 ), ο πυρροτίτης (Fe 1-x S) και ο αρσενοπυρίτης (FeAsS) σχηματίζοντας μεταλλικές αποθέσεις. Επίσης, συναντάται σε κοιτάσματα συνδεόμενα με φαινόμενα μεταμόρφωσης επαφής και σε αποθέσεις ιζηματογενών πετρωμάτων (Gilg and Frei, 1994;Nebel et al, 1991;Schoonen, 2004;Yan et al, 2014).…”