The Application of Oxygen and Hydrogen Isotope Studies to Problems of Hydrothermal Alteration and Ore Deposition

Taylor, Hugh P.

doi:10.2113/gsecongeo.69.6.843

Cited by 1,588 publications

(741 citation statements)

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“…These values fell on the boundary between biogenic origin by CO 2 reduction and mixed biogenic/thermogenic origins (Figure 2c). Stable hydrogen and oxygen isotopic ratios of groundwater ranged from À17.1% to À16.4% and from þ 0.8% to þ 0.9%, respectively, which were in good agreement with those of formation waters obtained from the southeastern Illinois Basin in the mid-continental region of the United States (Taylor, 1974).…”

Section: Resultssupporting

confidence: 79%

Microbial methane production in deep aquifer associated with the accretionary prism in Southwest Japan

et al. 2009

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To identify the methanogenic pathways present in a deep aquifer associated with an accretionary prism in Southwest Japan, a series of geochemical and microbiological studies of natural gas and groundwater derived from a deep aquifer were performed. Stable carbon isotopic analysis of methane in the natural gas and dissolved inorganic carbon (mainly bicarbonate) in groundwater suggested that the methane was derived from both thermogenic and biogenic processes. Archaeal 16S rRNA gene analysis revealed the dominance of H 2 -using methanogens in the groundwater. Furthermore, the high potential of methane production by H 2 -using methanogens was shown in enrichments using groundwater amended with H 2 and CO 2 . Bacterial 16S rRNA gene analysis showed that fermentative bacteria inhabited the deep aquifer. Anaerobic incubations using groundwater amended with organic substrates and bromoethanesulfonate (a methanogen inhibitor) suggested a high potential of H 2 and CO 2 generation by fermentative bacteria. To confirm whether or not methane is produced by a syntrophic consortium of H 2 -producing fermentative bacteria and H 2 -using methanogens, anaerobic incubations using the groundwater amended with organic substrates were performed. Consequently, H 2 accumulation and rapid methane production were observed in these enrichments incubated at 55 and 65 1C. Thus, our results suggested that past and ongoing syntrophic biodegradation of organic compounds by H 2 -producing fermentative bacteria and H 2 -using methanogens, as well as a thermogenic reaction, contributes to the significant methane reserves in the deep aquifer associated with the accretionary prism in Southwest Japan.

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Section: Resultssupporting

confidence: 79%

Microbial methane production in deep aquifer associated with the accretionary prism in Southwest Japan

et al. 2009

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“…The alteration includes potassic alteration, sodic-calcic alteration, chlorite-sericite alteration, phyllic alteration and propylitic alteration. Taylor (1974), the meteoric water line is from Zheng et al (1983), and the geothermal water area is from Zheng et al (1982) (2) The Early Jurassic quartz diorite porphyry formed at 181-175 Ma, and the mineralization of the No.2 deposit occurred at 172.6 ± 2.1 Ma. The porphyry has signatures similar to arc rocks, including depletion of Nb, Ta and HFSE and an enrichment of LILE.…”

Section: Resultsmentioning

confidence: 99%

“…The δ 18 O H2O values (−5.5 to +2.9‰ ) of the quartz samples from quartz -sulfide veins of the No.2 deposit show a slightly lower oxygen isotopic composition than magmatic water of δ 18 O H2O values of 5.5-10.0‰ (Taylor, 1974), whereas δ 18 D H2O values (−104.0 to −57.5‰) of quartz samples from the quartz -sulfide veins of the No.2 deposit exhibit relatively similar hydrogen isotopic composition to magmatic water of δ 18 D H2O values of −50‰ to −85‰ (Taylor, 1974). In the δ 18 O H2O versus δ 18 D H2O diagram (Fig.…”

Section: Sources Of Ore-forming Fluidsmentioning

confidence: 89%

Geology and Geochemistry Constraints on the Genesis of the NO.2 Porphyry Copper-Gold Deposit in the Xiongcun District, Gangdese Porphyry Copper Belt, Tibet, China

Yin¹

2017

Appl Ecol Env Res

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Abstract. The Xiongcun district is located in the western segment of the Gangdese porphyry copper belt (GPCB). The No.2 deposit in the Xiongcun district hosts a measured and indicated resource of 1.34 Mt copper, 76.34 t gold, and 193.78 t silver. The copper-gold mineralization of the No.2 deposit is mainly hosted in the Early Jurassic quartz diorite porphyry which intruded volcano-sedimentary rocks of the Early Jurassic Xiongcun Formation. S and Pb isotopic compositions of the ore sulfides and Re contents of molybdenite suggest a mantle source with minor contamination of subducted sediments for the ore-forming materials. Hydrogen and oxygen isotopic compositions of quartz from the quartz -sulfide veins suggest that the ore-forming fluid was a mixture of magmatic and meteoric water. Geochemical and Sr-Nd-Hf isotopic compositions of the Early Jurassic quartz diorite porphyry suggest that the mineralization of the No.2 deposit formed in an intra-oceanic island arc setting. The magmas of the Early Jurassic quartz diorite porphyry were likely sourced from partial melting of mantle with limited contamination by subducted sediments (ca. 5%). The formation of the porphyry and the No.2 deposit were related to the northward intra-oceanic subduction of the Neo-Tethys oceanic slab during the Early Jurassic.

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“…The δ 18 O andδD values for the ore-forming fluids at Xiaoliugouare plotted in the diagram of Taylor (1974) (Fig. 8).…”

Section: 1source Of Metals and Ore-forming Fluidsmentioning

confidence: 99%

Geology, geochronology and isotopic geochemistry of the Xiaoliugou W–Mo ore field in the Qilian Orogen, NW China: Case study of a skarn system formed during continental collision

Zheng

Ding

Cawood

et al. 2017

Ore Geology Reviews

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The Application of Oxygen and Hydrogen Isotope Studies to Problems of Hydrothermal Alteration and Ore Deposition

Cited by 1,588 publications

References 0 publications

Microbial methane production in deep aquifer associated with the accretionary prism in Southwest Japan

Microbial methane production in deep aquifer associated with the accretionary prism in Southwest Japan

Geology and Geochemistry Constraints on the Genesis of the NO.2 Porphyry Copper-Gold Deposit in the Xiongcun District, Gangdese Porphyry Copper Belt, Tibet, China

Geology, geochronology and isotopic geochemistry of the Xiaoliugou W–Mo ore field in the Qilian Orogen, NW China: Case study of a skarn system formed during continental collision

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