Zircon isotope evidence for ≥3.5Ga continental crust in the Yangtze craton of China

Zhang, Shao‐Bing; Zheng, Yong‐Fei; Wu, Yuan–Bao; Zhao, Zi‐Fu; Gao, Shan; Wu, Fu‐Yuan

doi:10.1016/j.precamres.2006.01.002

Cited by 366 publications

(174 citation statements)

References 80 publications

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“…The oldest emplacement age of ~2.95-2.9 Ga in the Kongling Group comes from TTG gneisses of the high grade metamorphic terrane [15][16][17]19,20]. The 3.3-3.2 Ga inherited zircon cores are also present from the same area, and some tonalite gneisses possibly intruded in the terrane during the same period [18].…”

Section: Discussionmentioning

confidence: 99%

“…However, the supporting evidence mainly comes from U-Pb studies of detrital zircons in metasedimentary rocks [5][6][7][8][9] or inherited zircons in igneous rocks [10][11][12][13][14]. The Archean age information obtained for the exposed basement rock series are mostly from the Kongling high grade metamorphic terrane at the northern margin of the Yangtze craton [15][16][17][18][19][20], with sporadic reports from the granulites in the Yudongzi Group and the Dabie Mountains [21][22][23]. To date, three main episodes of Archean magmatic event in the Yangtze craton have been recognized, i.e.…”

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confidence: 99%

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A ∼2.5 Ga magmatic event at the northern margin of the Yangtze craton: Evidence from U-Pb dating and Hf isotope analysis of zircons from the Douling Complex in the South Qinling orogen

et al. 2013

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The poorly studied Douling Complex is a crystalline basement that developed in the Neoproterozoic-Paleozoic weakly metamorphosed to non-metamorphosed strata at the South Qinling tectonic belt. Five banded dioritic-granitic gneiss samples from the Douling Complex were chosen for LA-MC-ICPMS U-Pb zircon dating, which yielded protolith emplacement ages of 2469 ± 22 Ma, 2479 ± 12 Ma, 2497 ± 21 Ma, 2501 ± 17 Ma and 2509 ± 14 Ma, respectively. An important peak age of ~2.48 Ga was also obtained for a metasedimentary rock in the same region. These discoveries suggest the occurrence of magmatic activity of 2.51-2.47 Ga at the northern margin of the Yangtze craton. The age-corrected ε Hf (t) values obtained from in situ zircon Hf isotopic analysis are mainly between −5.5 and +0.3, and the two-stage zircon Hf model ages range from 3.30 to 2.95 Ga. Considering two important periods of ~3.3-3.2 Ga and ~2.95-2.90 Ga for the continental crustal growth in the Yangtze craton, we infer that the dioritic-granitic gneisses from the Douling Complex are the products of reworking of Paleo-to Mesoarchean crust at the northern margin of the Yangtze craton at ~2.5 Ga. In addition, metamorphic ages of 837 ± 8 Ma and 818 ± 10 Ma were obtained for zircon overgrowth rims from a dioritic gneiss and a metasedimentary rock, indicating that the main phase amphibolite facies metamorphism of the Doulng Complex occurred during the Neoproterozoic, although its geological meaning remains ambiguous. U-

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

A ∼2.5 Ga magmatic event at the northern margin of the Yangtze craton: Evidence from U-Pb dating and Hf isotope analysis of zircons from the Douling Complex in the South Qinling orogen

et al. 2013

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“…[34] and mixed rocks (1980-2013 Ma, SHRIMP) [83]. These chronological records are distributed across the northern margin of the Yangtze block, and may represent a collisional orogenic events [34] related to the amalgamation of the Columbia supercontinent [29,34,35].…”

Section: Tectonic Significance Of Paleoproterozoic Rapakivi Granites mentioning

confidence: 98%

Discovery of Paleoproterozoic rapakivi granite on the northern margin of the Yangtze block and its geological significance

Zhang

Wang

et al. 2011

Chin. Sci. Bull.

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The Huashanguan rapakivi pluton in Zhongxiang, Hubei Province, China, is the first discovered Proterozoic rapakivi pluton in the Yangtze block. Based on field and petrographical observations, a typical rapakivi texture was found in the northern portion of the Huashanguan granitic pluton. Almost all the K-feldspar phenocrysts were round to oval in shape and most had plagioclase coatings known as rapakivi phenocrysts. Alkali feldspars and quartz had two or more generations. Petrochemically, the Huashanguan rapakivi granites were characterized as having high values of Si, K, Fe, Th, U, La, Ga, Ce, Sm and LREE, low values of Ca, Mg, Sr, Nb, Y and HREE, and a negative Eu anomaly. These geochemical characteristics of the Huashanguan granites were concordant with typical rapakivi granites, and had an affinity to A-type granites. LA-ICP-MS U-Pb zircon dating also was conducted. The dating yielded a 207 Pb/ 206 Pb weighted mean age of 1851±18 Ma (MSWD =1.2), which represents the age of the pluton emplacement. The age of 803±170 Ma at the lower intercept in the concordia diagram corresponds to the age of a later deformation event which affected the pluton, and suggests that the Huashanguan pluton was influenced by Neoproterozoic thermo-tectonic events after its formation. The discovery of Paleoproterozoic Huashanguan rapakivi granites indicates continental rifting or a post-orogenic extensional event that took place in the Paleoproterozoic in the Yangtze block. These events may be related to the breakup of the Paleoproterozoic Columbia supercontinent.

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“…Abundant Early to Middle Paleozoic and Late Proterozoic detrital zircons were found in these rocks. Although recent studies have shown that the North and South China (Yangtze) blocks likely underwent similar thermal events in the early Precambrian, especially in late Archean and early Proterozoic (e.g., Zheng et al, 2006;Zhang et al, 2006), they have had different thermal histories during Late Proterozoic and Early Paleozoic times. During the Late Proterozoic, the evolution of the Yangtze block was associated with magmatic-metamorphic events especially along the northern and western margins (e.g., Chen et al, 2003a, b;Rowley et al, 1997;Xue et al, 1997;Hacker et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Single-grain detrital muscovite Rb-Sr isotopic composition as an indicator of provenance for the Carboniferous sedimentary rocks in northern Dabie, China

et al. 2009

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Low-grade metamorphic Paleozoic sedimentary rocks are exposed along the northern margin of the Qinling-Dabie orogenic belt that formed by the collision of the North and South China blocks during the Early Mesozoic. Geological provenance and tectonic setting of these low-grade sedimentary rocks are strongly debated. Recent studies have shown that they contain Paleozoic, Late Proterozoic and Late Archean detrital zircons, which points to an origin from different sources including rocks from the South and North China blocks. This study presents single-grain mineral Rb-Sr results for detrital muscovites and biotites from Carboniferous sedimentary sequences of the Beihuaiyang low-grade metamorphic zone exposed along the northern margin of the Dabie Mountains. About 15% of detrital muscovite grains are phengitic in composition with high Si/Al ratios of >3.3. Single grain Rb-Sr isotopic analyses show that both muscovites and phengites give a pooled age of about 420 Ma, implying Middle Paleozoic thermal and high-pressure metamorphic events in the source area(s). Rb-Sr isotopic evidence from detrital biotites suggests at least two different sedimentary sources of old crustal rocks and juvenile material. The latter probably comprised magmatic rocks related to the Paleozoic convergence along the southern margin of the North China block. Whole-rock Sm-Nd isotopic composition of the sedimentary rocks also demonstrates a mixture of sedimentary sources of different ages that confirm conclusions proposed previously from evidence of detrital zircon ages. We conclude that the Paleozoic detrital phengites originate from Paleozoic subduction and subsequent collision proposed for the North Qinling terrane. Our study shows that, single-grain detrital mica Rb-Sr isotopic characteristics can be a potential indicator for the provenance of geological complex terranes.

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Zircon isotope evidence for ≥3.5Ga continental crust in the Yangtze craton of China

Cited by 366 publications

References 80 publications

A ∼2.5 Ga magmatic event at the northern margin of the Yangtze craton: Evidence from U-Pb dating and Hf isotope analysis of zircons from the Douling Complex in the South Qinling orogen

A ∼2.5 Ga magmatic event at the northern margin of the Yangtze craton: Evidence from U-Pb dating and Hf isotope analysis of zircons from the Douling Complex in the South Qinling orogen

Discovery of Paleoproterozoic rapakivi granite on the northern margin of the Yangtze block and its geological significance

Single-grain detrital muscovite Rb-Sr isotopic composition as an indicator of provenance for the Carboniferous sedimentary rocks in northern Dabie, China

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