A case of Te-rich low-sulfidation epithermal Au-Ag deposits in a calc-alkaline magmatic arc, NE China

Shen, Guobin; Hofstra, Albert H.; Qin, Kezhang; Xu, Hong

doi:10.1016/j.oregeorev.2022.105158

Cited by 2 publications

(5 citation statements)

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“…The amount of exhumation caused by this process is only about 2 km, so the rock body formed in the Early Mesozoic and the epithermal deposit formed in the Early Cretaceous is not eroded, but only exhumed to the surface and preserved. These results support that the spatial periodicity of epithermal systems along NW‐ and NE‐trending structures and suggest that there is potential for additional Au–Ag deposits in the North Heilongjiang Belt (Gao, Hofstra, et al, 2022).…”

Section: Discussionsupporting

confidence: 71%

“…The Mesozoic is a period of intensive tectonic and magmatic activities with mineralization in East Asia, due to the closure of the Mongolia‐Okhotsk Ocean and the subduction of the Palaeo‐Pacific Plate with Early Cretaceous regional extension in northeastern CAOB (Donskaya et al, 2008; Fan et al, 2003; Wang et al, 2006; Wu et al, 2005; Zorin, 1999). The Au mineralization includes Late Triassic Mengdehe orogenic Au, Late Jurassic Daxintun orogenic Au–Sb and Early Cretaceous epithermal Au–Ag during the Mesozoic (Table 4; Gao et al, 2018, b, 2022; Li et al, 2021). Orogenic Au mineralization is considered to be related to compressional deformation in this area.…”

Section: Discussionmentioning

confidence: 99%

“…Epithermal Au mineralization is related to extensional settings and hosted by volcanic rocks (e.g., andesite and dacite; Gao et al, 2017). These deposits are important Au and potential critical metal producers in the northeast Xing'an Block (Gao, Hofstra, et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…The Early Cretaceous large‐scale Au–Ag mineralization in NE China, for example, Sandaowanzi (>22 t Au), Beidagou (>5 t Au; Gao, Xu, Zang, & Wang, 2018), Pangkaimen (>8 t Au; Hu et al, 2013), Shangmachang (> 11 t Au; Gao, Xu, Zang, & Wang, 2018), Dong’ an (>24 t Au; Gao et al, 2021) and Gaosongshan (>22 t Au; Liu, 2015), may have been linked to lithospheric thinning under extensional tectonics in northeastern China (Figure 11c; Zhang, Mao, et al, 2010; Dong et al, 2014; Wu et al, 2015; Gao et al, 2017; Gao, Hofstra, et al, 2022). The ZHe and AHe ages record the large‐scale volcanic rocks from ca.…”

Section: Discussionmentioning

confidence: 99%

“…The Xing'an Block is located in the eastern part of the Paleozoic Central Asian Orogenic Belt (CAOB) and has massive tectonism and magmatism with Au mineralization during the Late Mesozoic (Gao et al, 2017; Qin et al, 1995, 2017), including orogenic Au deposits in the Late Triassic and Late Jurassic, as well as epithermal Au deposits in the Early Cretaceous (Gao et al, 2018, b, 2021, 2022, b; Li et al, 2020, 2021). However, the relationship between tectonic evolution and Au deposit preservation remains unclear.…”

Section: Introductionmentioning

confidence: 99%

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Late Mesozoic tectonic evolution and thermal history in the northeast Xing'an Block, NE China: Implications for gold mineralization and preservation

Wang,

Gao,

et al. 2023

Geological Journal

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Late Triassic–Jurassic orogenic and Early Cretaceous epithermal Au deposits are significant producers of Au, Ag, and potentially critical elements (e.g., Te, Se and Sb) in the North Heilongjiang Belt in the Xing'an Block, NE China. However, the preservation mechanism of these Au deposits associated with tectonic evolution is unclear. Here, we conducted zircon U–Pb, sericite Ar–Ar, zircon and apatite (U–Th)/He dating as well as whole‐rock geochemistry in the Xing'an Block. Zircon U–Pb dating shows the ages of 174.1 ± 2.4 Ma for the granodiorite, 169.9 ± 1.6 Ma for the tonalite, 154.0 ± 2.0 Ma for the monzogranite and ca.122 Ma for the diorite. Sericite Ar–Ar dating presents plateau and isochron ages of 163.2 ± 1.8 Ma and 163.4 ± 2.8 Ma. The average apatite (U–Th)/He (AHe) and zircon (U–Th)/He (ZHe) ages from the Jurassic rocks have the ranges of ca. 146–89 Ma and ca. 150–116 Ma and from the Cretaceous are ca. 109–76 Ma and ca. 117–111 Ma, respectively. The Early‐Middle Jurassic intrusions are featured by the tonalite‐trondhjemite‐granodiorite (TTG) rock type. Late Jurassic monzogranite has the geochemical signature of adakitic rocks. The Early Cretaceous granitoids are classified as volcanic arc granites with a part of the Early Cretaceous granodiorite featured by adakitic. These new results reveal five group ages associated with tectonic evolution, Au mineralization and the preservation of the Au deposits. (i) Magmatic events were related to the subduction of the Mongolia‐Okhotsk Ocean during the Early Jurassic (ca. 177–170 Ma) and then the compressional settings with regional deformation (ca. 167–163 Ma). (ii) Thickening crust and orogenic Au mineralization were related to the closure of the Mongolia‐Okhotsk Ocean (ca. 154–145 Ma). (iii) The transformation was from compressional to extensional settings followed by exhumation during the Early Cretaceous (ca. 145–120 Ma), which is the factor of the exhumation of the orogenic Au deposits formed from the Late Triassic to Late Jurassic. (iv) Epithermal Au–Ag mineralization was associated with an extension related to the subduction of the Palaeo‐Pacific Plate (ca. 120–100 Ma). (v) Thermal history shows one thermal event during the Late Cretaceous (ca. 89–76 Ma). The Au deposits have been preserved since the Late Cretaceous.

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Section: Discussionsupporting

confidence: 71%