Zhang, Liang, Weinberg, Roberto F., Yang, Li-Qiang, Groves, David I., Sai, Sheng-Xun, Matchan, Erin, Phillips, David, Kohn, Barry P., Miggins, Daniel P., Liu, Yue, Deng, Jun (2020) Mesozoic Orogenic Gold Mineralization in the Jiaodong Peninsula, China: A Focused Event at 120 ± 2 Ma During Cooling of Pregold Granite Intrusions. Economic Geology, 115 (2) 415-441 doi:10.5382/econgeo.4716
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Mesozoic Orogenic Gold Mineralization in the Jiaodong Peninsula, China: A Focused Event at 120 ± 2 Ma During Cooling of Pregold Granite Intrusions | ||
| Journal | Economic Geology | ||
| Authors | Zhang, Liang | Author | |
| Weinberg, Roberto F. | Author | ||
| Yang, Li-Qiang | Author | ||
| Groves, David I. | Author | ||
| Sai, Sheng-Xun | Author | ||
| Matchan, Erin | Author | ||
| Phillips, David | Author | ||
| Kohn, Barry P. | Author | ||
| Miggins, Daniel P. | Author | ||
| Liu, Yue | Author | ||
| Deng, Jun | Author | ||
| Year | 2020 (March 1) | Volume | 115 |
| Page(s) | 415-441 | Issue | 2 |
| Publisher | Society of Economic Geologists | ||
| DOI | doi:10.5382/econgeo.4716Search in ResearchGate | ||
| Mindat Ref. ID | 224411 | Long-form Identifier | mindat:1:5:224411:6 |
| GUID | 3b5791ba-7809-4077-a6fe-c692f04926e7 | ||
| Full Reference | Zhang, Liang, Weinberg, Roberto F., Yang, Li-Qiang, Groves, David I., Sai, Sheng-Xun, Matchan, Erin, Phillips, David, Kohn, Barry P., Miggins, Daniel P., Liu, Yue, Deng, Jun (2020) Mesozoic Orogenic Gold Mineralization in the Jiaodong Peninsula, China: A Focused Event at 120 ± 2 Ma During Cooling of Pregold Granite Intrusions. Economic Geology, 115 (2) 415-441 doi:10.5382/econgeo.4716 | ||
| Plain Text | Zhang, Liang, Weinberg, Roberto F., Yang, Li-Qiang, Groves, David I., Sai, Sheng-Xun, Matchan, Erin, Phillips, David, Kohn, Barry P., Miggins, Daniel P., Liu, Yue, Deng, Jun (2020) Mesozoic Orogenic Gold Mineralization in the Jiaodong Peninsula, China: A Focused Event at 120 ± 2 Ma During Cooling of Pregold Granite Intrusions. Economic Geology, 115 (2) 415-441 doi:10.5382/econgeo.4716 | ||
| In | (2020, March) Economic Geology Vol. 115 (2) Society of Economic Geologists | ||
| Abstract/Notes | Abstract Jiaodong gold deposits are mainly sited along faulted contacts between Upper Jurassic Linglong granite and Precambrian basement metamorphic rocks or Lower Cretaceous Guojialing granite. Long-standing controversies relate to timing of gold mineralization and granite-gold relationships. In this study, gold-related muscovite consistently provides concordant 40Ar/39Ar plateau ages of 120 ± 2 Ma (2σ) for the Jiaojia, Sizhuang, and Luoshan deposits. Analogous 40Ar/39Ar timing constraints from gold-related muscovite are provided by total gas and high-temperature ages from Fushan, concordant high-temperature ages from Rushan, and fusion-step ages from Xiadian deposits. These new 40Ar/39Ar ages, when combined with previous reliable 40Ar/39Ar and U-Pb age constraints for mineralization, including ages of pre- and postgold dikes, define a widespread gold mineralization event at 120 ± 2 Ma (2σ). Published zircon U-Pb ages for Guojialing and Aishan granite magmatism suggest an ~8-m.y. lag between peak intrusive activity and gold mineralization. This, together with lack of both high-temperature alteration assemblages and alteration and/or metal zonation, indicates that the structurally controlled Jiaodong deposits are orogenic rather than intrusion-related deposits. Despite this, granite intrusions are considered to have provided suitable fluid trap sites. New 40Ar/39Ar analyses of biotite from the Linglong and Guojialing granites show they had cooled to about ~300° ± 50°C by ca. 123 to 124 Ma, providing pressure-temperature conditions similar to those under which most orogenic gold deposits formed close to the ductile-brittle transition. This enabled the effective ingress of fluids at supralithostatic pressures at 120 ± 2 Ma, leading to intensive brecciation, alteration, and deposition of both vein-type and disseminated gold ores. New zircon (U-Th)/He dates together with apatite fission-track data indicate that preservation of the gold province is due to slow postmineralization uplift and exhumation. | ||
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