Re-Os isotope dating of pyrite from the footwall mineralization zone of the Xinqiao deposit, Tongling, Anhui Province: Geochronological evidence for submarine exhalative sedimentation

Guo, Weimin; Lu, Jianjun; Jiang, Shao‐Yong; Zhang, Rongqing; Qi, Liang

doi:10.1007/s11434-011-4770-y

Cited by 42 publications

(20 citation statements)

References 30 publications

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“…The Upper Permian black shale from the Laoyaling Mo orebody has been dated to 234.2 ± 7.3 Ma by the Re–Os technique, which is much earlier than the Yanshanian intrusions and younger than the Permian host rock, suggesting that the Mo ore is sedimentary in origin with later hydrothermal disturbance (Yang et al ., ). The latest Re–Os isotope dating of pyrite from the veinlets or network mineralization zone of the Xinqiao deposit reports an age of 319 ± 13 Ma (Guo et al ., ), which is consistent with the age of Carboniferous strata hosting the stratiform sulfide orebody. The Dongguashan deposit is proposed to have been formed through remobilization of Carboniferous sedimentary exhalative sulfides by a hydrothermal activity related to Yanshanian pluton based on sulfur isotopic study (Hou et al ., ).…”

Section: Introductionsupporting

confidence: 82%

Geological and Geochemical Characteristics of the Huangshilao Stratabound Gold Deposit in the Tongguanshan Orefield, Tongling, East‐Central China

Wang

et al. 2013

Resource Geology

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The Huangshilao gold deposit (>13.5 t Au) is comprised of stratabound pyrite-dominant massive sulfide ores, and is distinguished from the skarn Cu, Au, and Cu-Au deposits that are dominant in the Tongguanshan orefield, Tongling, east-central China. The stratabound orebodies are situated along flexural slip faults along the unconformity between the Upper Devonian Wutong and the Upper Carboniferous Huanglong Formations. The ores, dominated by crystallized pyrite, colloform pyrite, and pyrrhotite, are systematically sampled from the underground stopes along strike drifts. Keywords: Huangshilao, stratabound, sulfur isotope, Tongguanshan, Tongling. IntroductionThe Huangshilao stratabound gold deposit is located in the Tongling ore district in the Middle-Lower Yangtze River metallogenic belt, east-central China (Fig. 1). The belt, extending from Wuhan in the eastern Hubei Province in the west to Zhenjiang in the southern Jiangsu Province in the east, is a well-known Cu-Mo-Au-Fe polymetallic belt and contains more than 200 major polymetallic (Cu-Fe-Au, Mo, Zn, Pb and Ag) deposits (Chang et al., 1991;Zhai et al., 1992;Pan & Dong, 1999). The Tongling district mainly contains skarn, porphyry and stratabound deposits Mao et al., 2011 et al., 2011). However, the genesis of the stratabound deposits, e.g., Xinqiao, Dongguashan, Datuanshan, Shimenkou, Laoyaling, and Huangshilao, within the Neopaleozoic-Mesozoic sedimentary rocks has remained controversial for decades. Some researchers have suggested that the stratabound deposits formed through replacement of carbonate rocks by magmatic fluids differentiated from the Yanshanian intrusions, which is supported by geochemical data (Pan & Dong, 1999). Copper isotopes of chalcopyrite from the stratabound Cu-Au-Mo orebodies in the Dongguashan deposit indicate that the Cu is derived from the Yanshanian granitic intrusions (Huang et al., 2003;Lu et al., 2003Lu et al., , 2008. Molybdenite Re-Os isotope geochemistry also denotes that the Datuanshan stratabound Cu orebodies are the result of magmatic hydrothermal replacement (Mao et al., 2006). Some researchers, however, have suggested a synsedimentary-exhalative model based on the syngenetic sedimentary morphologies of the orebodies with banded, laminated and carbonate mud mound structure, and the presence of colloform and framboidal pyrite in some localities (Xu et al., 1982;Gu & Xu, 1986;Li, 1989;Yue et al., 1993;Gu et al., 2007;Jiang et al., 2011). A pyrite Re-Os emplacement age of 303 Ϯ 33 Ma of the Shimenkou bedded pyrite orebody is similar to the Carboniferous host rock and much earlier than the Yanshanian granitoids . The Upper Permian black shale from the Laoyaling Mo orebody has been dated to 234.2 Ϯ 7.3 Ma by the Re-Os technique, which is much earlier than the Yanshanian intrusions and younger than the Permian host rock, suggesting that the Mo ore is sedimentary in origin with later hydrothermal disturbance . The latest Re-Os isotope

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Section: Introductionsupporting

confidence: 82%

Geological and Geochemical Characteristics of the Huangshilao Stratabound Gold Deposit in the Tongguanshan Orefield, Tongling, East‐Central China

Wang

et al. 2013

Resource Geology

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“…). Pyrite from Cu–Au deposits (Cardon et al ., ; Xie et al ., ; Guo et al ., ) or Cu–Ag deposits (Selby et al ., ) has relatively high Re (Fig. ).…”

Section: Discussionmentioning

confidence: 97%

First ReliableRe–OsAges of Pyrite and Stable Isotope Compositions ofFe(‐Cu) Deposits in theHami Region,EasternTianshanOrogenicBelt,NW China

Huang

Gao

et al. 2013

Resource Geology

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The Eastern Tianshan Orogenic Belt (ETOB) in NW China is composed of the Dananhu-Tousuquan arc belt, the Kanggurtag belt, the Aqishan-Yamansu belt and the Central Tianshan belt from north to south. These tectonic belts have formed through arc-continent or arc-arc collisions during the Paleozoic. A number of Fe(-Cu) deposits in the Aqishan-Yamansu belt, including the Heifengshan, Shuangfengshan and Shaquanzi Fe(-Cu) deposits, are associated with Carboniferous-Early Permian volcanic rocks and are composed of vein-type magnetite ores. Metallic minerals are dominated by magnetite and pyrite, with minor chalcopyrite. Calcite, chlorite, and epidote are the dominant gangue minerals. Pyrite separates of ores from those three deposits have relatively high and variable Re contents ranging from 3.7 to 184 ppb. All pyrite separates have very low common Os, allowing us calculation of single mineral model ages for each sample. Pyrite separates from the Heifengshan Fe deposit have an 18O SMOW ranging from -5.5‰ to -1.0‰ and from 10‰ to 12.7‰, respectively. These stable isotopic data suggest that S, C, and O are magmatichydrothermal in origin. The association of low-Ti magnetite and Fe/Cu-sulfides resembles those of Iron-Oxide-Copper-Gold (IOCG) deposits elsewhere. Our reliable Re-Os ages of pyrite suggest that the Fe(-Cu) deposits in the Aqishan-Yamansu belt formed at~296 Ma, probably in a back-arc extensional environment.

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“…These deposits are predominantly hosted in Carboniferous carbonates, but show a close spatial association with Cretaceous granitoid intrusions that are genetically related to porphyryskarn ores (Mao et al 2011)and references therein). Despite many years of research, considerable debate remains on the genesis of these deposits (Guo et al 2011;Mao et al 2011;Xie et al 2014;Xiao et al 2016). Several studies advocate that the stratabound massive sulfide deposits are products of a Carboniferous sedimentary exhalative (SEDEX) system, which was overprinted by hydrothermal fluids associated with Cretaceous magmatism (Gu et al 2000;Gu et al 2007;Zhou et al 2010;Guo et al 2011;Xie et al 2014;Xiao et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Despite many years of research, considerable debate remains on the genesis of these deposits (Guo et al 2011;Mao et al 2011;Xie et al 2014;Xiao et al 2016). Several studies advocate that the stratabound massive sulfide deposits are products of a Carboniferous sedimentary exhalative (SEDEX) system, which was overprinted by hydrothermal fluids associated with Cretaceous magmatism (Gu et al 2000;Gu et al 2007;Zhou et al 2010;Guo et al 2011;Xie et al 2014;Xiao et al 2016). In contrast, some authors considered these deposits as skarn/carbonate replacement systems genetically associated with Cretaceous magmatism (Pan and Dong 1999;Mao et al 2011;Zhang et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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An Early Cretaceous carbonate replacement origin for the Xinqiao stratabound massive sulfide deposit, Middle-Lower Yangtze Metallogenic Belt, China

Yang

et al. 2017

Ore Geology Reviews

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Re-Os isotope dating of pyrite from the footwall mineralization zone of the Xinqiao deposit, Tongling, Anhui Province: Geochronological evidence for submarine exhalative sedimentation

Cited by 42 publications

References 30 publications

Geological and Geochemical Characteristics of the Huangshilao Stratabound Gold Deposit in the Tongguanshan Orefield, Tongling, East‐Central China

Geological and Geochemical Characteristics of the Huangshilao Stratabound Gold Deposit in the Tongguanshan Orefield, Tongling, East‐Central China

First ReliableRe–OsAges of Pyrite and Stable Isotope Compositions ofFe(‐Cu) Deposits in theHami Region,EasternTianshanOrogenicBelt,NW China

An Early Cretaceous carbonate replacement origin for the Xinqiao stratabound massive sulfide deposit, Middle-Lower Yangtze Metallogenic Belt, China

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