Cheng, Hao et al. (2009) Transitional time of oceanic to continental subduction in the Dabie orogen: Constraints from U-Pb, Lu-Hf, Sm-Nd and Ar-Ar multichronometric dating, Lithos, 110, 327-342, doi: 10.1016/j.lithos.2009.01.013. < 20100403102547430.admin > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    We investigated the oceanic-type Xiongdian high-pressure eclogites in the western part of the Dabie orogen with combined U–Pb, Lu–Hf, Sm–Nd and Ar–Ar geochronology. Three groups of weighted-mean 206Pb/238U ages at 315 ± 5, 373 ± 4 and 422 ± 7 Ma are largely consistent with previous dates. In contrast, Lu–Hf and Sm–Nd isochron dates yield identical ages of 268.9 ± 6.9 and 271.3 ± 5.3 Ma. Phengite and amphibole Ar–Ar total fusion analyses give Neoproterozoic apparent ages, which are geologically meaningless due to the presence of excess 40Ar. Plagioclase inclusions in zircon cores suggest that the Silurian ages likely represent protolith ages, whereas the Carboniferous ages correspond to prograde metamorphism, based on the compositions of garnet inclusions. Despite weakly-preserved prograde major- and trace element zoning in garnet, a combined textural and compositional study reveals that the consistent Lu–Hf and Sm–Nd ages of ca. 270 Ma record a later event of garnet growth and thus mark the termination of high-pressure eclogite–facies metamorphism. The new U–Pb, Lu–Hf and Sm–Nd ages suggest a model of continuous processes from oceanic to continental subduction, pointing to the onset of prograde metamorphism prior to ca. 315 Ma for the subduction of oceanic crust, while the peak eclogite–facies metamorphic episode is constrained to between ca. 315 and 270 Ma. Thus, the initiation of continental subduction is not earlier than ca. 270 Ma.

  • doi: 10.1016/j.lithos.2009.01.013
  • modified at 16 h ago


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on Q-ICPMS Agilent 7500cs
Tixhr 1723323065 thumb DB17 < 20151023084657-641059 >pub
  • IGSN: IEDRM00R2
  • classification: metamorphic
  • physical-form: aliquot
  • quantity (kg): 0.095
  • description: Dabie orogen, the east bank of the river to the east of Xiongdian village; coarse-grained and strongly foliated banded eclogite
  • modified at 2019-12-24
Tixhr786149358 thumb DB18 < 20151023085231-110359 >pub
  • IGSN: IEDRM00R3
  • classification: metamorphic
  • physical-form: aliquot
  • quantity (kg): 0.23
  • description: Dabie orogen, the east bank of the river to the east of Xiongdian village; coarse-grained and strongly foliated banded eclogite
  • modified at 2019-12-24
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binder of Transitional time of oceanic to continental subduction in the Dabie orogen: Constraints from U-Pb, Lu-Hf, Sm-Nd and Ar-Ar multichronometric dating pub container 20160212152642-139951
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DB18 pub Q-ICPMS Agilent 7500cs 28 20190828112330-335234
DB18 pub XRF PANalytical PW2400 14 20190828111704-830904
DB18_Garnet pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-127143
DB17_Quartz pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-186272
DB17_Phengite pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-642569
DB17_Garnet pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-185937
DB17_Omphacite pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-004333
DB17_Zoisite pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-394721
DB17_Amphibole pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-741222
DB17_Kyanite pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-000381
DB17_Whole rock pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-991499
DB18_Omphacite pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-559498
DB18_Whole rock pub 25W MIR-10 CO2 laser (at the University of Science and Technology of China in Hefei) 1 20190828114136-867833
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DB17Zr-1 pub MC-ICP-MS Finnigan, Neptune 7 20190828145906-713253
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DB17Zr-21 pub MC-ICP-MS Finnigan, Neptune 7 20190828145909-419250
DB17Zr-22 pub MC-ICP-MS Finnigan, Neptune 7 20190828145910-956365
DB17Zr-23 pub MC-ICP-MS Finnigan, Neptune 7 20190828145910-863349
DB17Zr-24 pub MC-ICP-MS Finnigan, Neptune 7 20190828145911-964993
DB17Zr-25 pub MC-ICP-MS Finnigan, Neptune 7 20190828145911-408156
name spots global-id
caption ID assembly stone
Table 4. Oxygen isotope data of minerals for the Xiongdian eclogite pub 20190828114326-522586 oxygen (d18O) 11
Table 5. LA-ICPMS trace element analyses of zircon and Zr composition of rutile by SIMS in the Xiongdian eclogite pub 20190828120734-372946 trace_Zr (Hao et al., 2009) 29
Table 6. Zircon U-Pb isotopic data obtained by LA-ICPMS for the Xiongdian eclogite pub 20190828150307-150596 U-series (Hao et al., 2009) 25
Table 1. Chemical compositions of the Xiongdian eclogite from the western Dabie pub 20190828112833-879441 major-trace (Hao et al., 2009) 2
manual
  • name
  • Cheng, Hao
  • King, Robert L.
  • Nakamura, E.
  • Vervoort, J. D.
  • Zheng, Y.-F.
  • Ota, T.
  • Wu, Y.-B.
  • Kobayashi, Katsura
  • Zhou, Z.-Y.