5 results on '"Feng, Qinglai"'
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2. Detrital zircon U–Pb and Hf analyses of Silurian–Devonian sediments in the Sukhothai Terrane, northern Thailand: implications for the Mid-Paleozoic arc belt.
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Nie, Xiaomei, Feng, Qinglai, Zi, Jianwei, Gan, Zhengqin, Metcalfe, Ian, Chonglakmani, Chongpan, Monjai, Denchok, Zhao, Tianyu, Ren, Jianye, Khanmanee, Jongkonnee, and Nulay, Pradit
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PROVENANCE (Geology) , *ZIRCON , *FLYSCH , *SEDIMENT analysis , *TRACE element analysis , *BACK-arc basins , *SEDIMENTARY rocks - Abstract
The Sukhothai Terrane in northern Thailand consists of continental basement and a Permo-Triassic magmatic arc related to the subduction of the main Palaeo-Tethys Ocean. The Donchai Group represents the oldest sedimentary sequence of the Sukhothai Terrane and consists mainly of meta-sandstone, quartzo-feldspathic schist, phyllite and silty slate. We present new detrital zircon U–Pb geochronology, Lu–Hf isotope data and geochemical data for the sedimentary rocks of the Donchai Group to elucidate the depositional age, provenance and nature of the group. The youngest detrital zircon ages (433–403 Ma) suggest that the Donchai Group accumulated between 433 and 368 Ma, revealing Silurian–Devonian arc magmatic rocks on the western margin of the Sukhothai Terrane. Sediments of the Donchai Group were sourced from both the continental basement and a Silurian–Early Devonian magmatic arc, suggesting a depositional setting on the continental slope of a back-arc basin along the western flank of the Sukhothai Terrane. The Silurian–Devonian arc belt in SW China probably extends to the Chiang Rai region to the west of the Sukhothai Terrane, northern Thailand, revealing the northwards subduction of the Proto-Tethys Ocean along the western Simao and Sukhothai margin during the mid-Paleozoic. The inferred arc and back-arc configuration of the Proto-Tethys Ocean in northern Thailand is comparable with that recently established in Yunnan, SW China. Supplementary material: Detrital zircon U–Pb ages and trace element analyses, zircon in-situ Lu–Hf isotopic compositions and whole-rock geochemical data are available at https://doi.org/10.6084/m9.figshare.c.6858373 [ABSTRACT FROM AUTHOR]
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- 2024
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3. Tracking Prototethyan assembly felsic magmatic suites in southern Yunnan (SW China): evidence for an Early Ordovician–Early Silurian arc–back-arc system.
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Liu, Guichun, Chen, Guangyan, Santosh, M., Qian, Xin, Sun, Zaibo, Zi, Jian-Wei, Zhao, Tianyu, Feng, Qinglai, and Ma, Shen
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IGNEOUS rocks ,PALEOZOIC Era ,GRANITE ,AMPHIBOLITES ,ZIRCON - Abstract
Early Paleozoic trondhjemites, gneissic granites and alkali granites in southern Yunnan preserve important records of the tectonic evolution of the Prototethyan Ocean and regional correlations. Zircon ages suggest that these granitoids were emplaced from 476 to 436 Ma. The trondhjemites are characterized by high Na
2 O and low K2 O contents, with εNd (t) values of −1.9 to −3.5 and εHf (t) values of −2.8 to +3.9. The trondhjemites were derived from an amphibolite source with a juvenile mafic component. The gneissic granites belong to the metaluminous low-K calc-alkaline series with an εNd (t) value of −6.2 and εHf (t) values of −5.0 to −0.4. The alkali granites belong to the high-K calc-alkaline series and yield εNd (t) values of −10.1 to −10.7 and εHf (t) values of −7.9 to −2.3. The gneissic granites were derived from an 'ancient' lower mafic crust, whereas the alkali granites were derived from a meta-sedimentary source. These granitoids were formed during the subduction of the Prototethyan Ocean beneath the Simao Block and can be compared with similar igneous rocks from the Truong Son and Tam Ky-Phuoc Son zones in southern Laos. Our study, along with Early Paleozoic igneous suites from southern Laos, central Vietnam and the Malay Peninsula, suggests an arc–back-arc system along the northern margin of Gondwana. Supplementary material: Tables of zircon U–Pb and in-situ Hf and geochemical data are available at https://doi.org/10.6084/m9.figshare.c.5322386 [ABSTRACT FROM AUTHOR]- Published
- 2021
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4. Locating the Yangtze Block in Nuna: Constraints from age and isotopic data from Paleoproterozoic sedimentary rocks in the Phan Si Pan Zone, northwest Vietnam.
- Author
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Zhao, Tianyu, Cawood, Peter A., Zi, Jian-Wei, Wang, Kai, Feng, Qinglai, Tran, Dung My, Trinh, Huan Dinh, Dang, Cung My, and Nguyen, Quyen Minh
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SEDIMENTARY rocks , *PROVENANCE (Geology) , *HAFNIUM isotopes , *ZIRCON , *AGE ,LAURENTIA (Continent) - Abstract
• The maximum depositional age of the Suoi Chieng Formation is 1769 Ma. • The U-Pb age and Hf isotopes indicate sources originate from local basement rocks and the Rae craton of North Laurentia. • Distinct crustal evolutionary histories for the SW Yangtze and N Yangtze before their assembly in the late Paleoproterozoic. • The Yangtze Block was situated between southern Siberia and northern Laurentia within Nuna supercontinent. New U-Pb ages and Hf isotopic data for detrital zircons from the late Paleoproterozoic sedimentary rocks (Suoi Chieng Formation) in the Phan Si Pan Zone of northwest Vietnam constrain their depositional ages, provenance, and tectonic setting. The weighted average age of the youngest coherent zircon population is 1769 ± 31 Ma (MSWD = 1.3, n = 8), which provides a maximum depositional age for the Suoi Chieng Formation. The detrital zircons obtained from six Paleoproterozoic samples exhibit various ages, showing multiple magmatic and metamorphic events. The detrital zircon age pattern shows that magmatic activities in the source areas occurred at 2650 Ma, 2350–2150 Ma, and 2050 Ma, as well as minor activities at 2850 Ma, 1850 Ma, and 1780 Ma. Additionally, a prominent metamorphic age peak is observed around ca. 1850 Ma, while a few metamorphic zircons exhibit ages ranging from 2600 to 2500 Ma and 2100 Ma. This pattern indicates that the primary source of these zircons is the local basement rocks of the Phan Si Pan Zone and SW Yangtze. However, contributions from other adjoining cratonic blocks are also possible and these likely included the Rae craton of North Laurentia. Our new data verifies and expands earlier results, showing that the SW Yangtze and north Yangtze have distinct Archean-Paleoproterozoic crustal evolutionary histories prior to their assembly in the late Paleoproterozoic. Regional correlations based on detrital zircon spectra, stratigraphic and tectono-thermal histories show strong similarities between the SW Yangtze and the Rae craton of north Laurentia throughout the Paleoproterozoic, suggesting the proximity of the two blocks before or during the formation of the Nuna supercontinent. We further suggest that the north Yangtze adjoined southern Siberia in the Archean to late Paleoproterozoic as supported by their identical tectono-thermal histories and detrital zircon age spectra. In combination with published data, we propose that the Yangtze Block was located between north Laurentia and south Siberia during the Nuna assembly. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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5. A refined Archean-Paleoproterozoic magmatic framework of the Cuoke Complex, SW China, and its implications for early Precambrian evolution of the Yangtze Block.
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Yang, Zhao, Zi, Jian-Wei, Cawood, Peter A., Zhao, Tianyu, Liu, Guichun, Li, Jing, Zhang, Hu, Wei, Yuehua, and Feng, Qinglai
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PRECAMBRIAN , *AGE distribution , *IGNEOUS rocks , *ZIRCON , *LASER ablation inductively coupled plasma mass spectrometry , *ARCHAEAN - Abstract
• Major magmatic episodes in southwestern Yangtze at ca. 3.08, 2.85 and 2.36–2.32 Ga. • Northern and southwestern domains of the Yangtze show differences in crustal growth. • The two domains have independent evolutionary histories prior to mid-Paleoproterozoic. • The two domains share a common history during and after Nuna assembly. New age data from the Cuoke Complex in southwestern Yangtze Block, integrated with published data from this region, indicate an Archean to early Paleoproterozoic magmatic history distinct from the northern Yangtze Block. Zircon cores and rims from eleven granitoids of the Cuoke Complex were analyzed by LA-ICP-MS and SHRIMP and show magmatic U-Pb ages ranging from 2850 to 2194 Ma. Combined U-Pb zircon igneous age data from the Kunming-Hainan Domain in the southwestern Yangtze Block display major magmatism ranging 3.10–3.06 Ga with a peak at ca. 3.08 Ga, 2.92–2.77 Ga with a peak at ca. 2.85 Ga and 2.4–2.1 Ga with peaks at 2.36–2.32 Ga and 2.22 Ga. This age distribution contrasts with the zircon U-Pb magmatic age data from the igneous rocks of the Kongling Domain in the northern Yangtze Block. A gap in magmatic activity in the northern domain between 2.4 and 2.2 Ga overlaps with the major peak in magmatism in the southwestern domain. Furthermore, potassic granitoids, which mark the cratonization of the two domains are more than 200 Ma years earlier in the Kongling Domain than that in the Kunming-Hainan Domain. Hf isotopic compositions of zircons from igneous rocks of the southwestern domain indicates significant juvenile crustal generation during the Mesoarchean era peaked at ca. 3.08 Ga, whereas the early Paleoproterozoic was characterized by crustal reworking and remelting. Zircon Hf isotopic compositions also reveal differences in crustal growth between the two domains. The northern domain shows a wider two-stage Hf model age range, with a peak at ca. 3.17 Ga and a subsidiary peak at ca. 3.78 Ga. Therefore, the northern domain also shows significant crustal growth in the Mesoarchean, though the age peak is about 100 Ma older compared to the southwestern domain. The Eoarchean crustal growth event recorded in the northern domain is absent in the southwestern domain. Therefore, the southwestern and northern Yangtze blocks display independent magmatic histories during the Archean and early Paleoproterozoic. The common records of late Paleo- and Mesoproterozoic tectonothermal events indicate the two domains were juxtaposed at this time, probably in association with assembly of the Nuna supercontinent. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
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