Contrasting geochemical and Sm-Nd isotopic compositions of Archean metasediments from the Kongling high-grade terrain of the Yangtze craton: evidence for cratonic evolution and redistribution of REE during crustal anatexis

Gao, Shan; Ling, Weijun; Qiu, Yumin; Zhou, Lian; Hartmann, Gerald; Simon, Klaus

doi:10.1016/s0016-7037(99)00153-2

Cited by 594 publications

(254 citation statements)

References 51 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: 98%

“…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: 98%

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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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“…1a), which amalgamated during the Neoproterozoic Sibao (also called "Jiangnan" or "Jinning") orogeny (Chen and Jahn, 1998;Li, 1998aLi, , 1998bZhao et al, 2011). The YZB comprises Neo-Archean metamorphosed basement, sporadically exposed in Yunnan, Guizhou, and Hubei provinces (Gao et al, 1999;Qiu et al, 2000;Charvet, 2013). The CAB is composed of Proterozoic basement, Sinian to Triassic sedimentary cover (Li et al, 1997(Li et al, , 2012Chen and Jahn, 1998;Yu et al, 2009), and Mesozoic granitoid intrusions and volcanic rocks with a total area of~220,000 km 2 , characterized by extensive metallic mineralization .…”

Section: Regional Geologymentioning

confidence: 99%

Zircon U–Pb, molybdenite Re–Os and muscovite Ar–Ar isotopic dating of the Xitian W–Sn polymetallic deposit, eastern Hunan Province, South China and its geological significance

Liang

Dong

Jiang

et al. 2016

Ore Geology Reviews

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The Xitian tungsten-tin (W-Sn) polymetallic deposit, located in eastern Hunan Province, South China, is a recently explored region containing one of the largest W-Sn deposits in the Nanling W-Sn metallogenic province. The mineral zones in this deposit comprise skarn, greisen, structurally altered rock and quartz-vein types. The deposit is mainly hosted by Devonian dolomitic limestone at the contact with the Xitian granite complex. The Xitian granite complex consists of Indosinian (Late Triassic, and Yanshanian (Late Jurassic-Early Cretaceous, 165-141 Ma) granites. Zircons from two samples of the Xitian granite dated using laser ablationinductively coupled mass spectrometer (LA-ICPMS) U-Pb analysis yielded two ages of 225.6 ± 1.3 Ma and 151.8±1.4 Ma, representing the emplacement ages of two episodic intrusions of the Xitian granite complex. Molybdenites separated from ore-bearing quartz-veins yielded a Re-Os isochron age of 149.7±0.9 Ma, in excellent agreement with a weighted mean age of 150.3±0.5 Ma. Two samples of muscovites from ore-bearing greisens yielded 40 Ar/ 39 Ar plateau ages of 149.5±1.5 Ma and 149.4±1.5 Ma, respectively. These isotopic ages obtained from hydrothermal minerals are slightly younger than the zircon U-Pb age of 151.8±1.4 Ma of the Yanshanian granite in the Xitian area, indicating that the W-Sn mineralization is genetically related to the Late Jurassic magmatism. The Xitian deposit is a good example of the Early Yanshanian regional W-Sn ore-forming event (160-150 Ma) in the Nanling region. The relatively high Re contents (8.7 to 44.0 ppm, average of 30.5 ppm) in molybdenites suggest a mixture of mantle and crustal sources in the genesis of the ore-forming fluids and melts. Based upon previous geochemical studies of Early Yanshanian granite and regional geology, we argue that the Xitian W-Sn polymetallic deposit can be attributed to back-arc lithosphere extension in the region, which was probably triggered by the break-off of the flat-slab of the Palae-Pacific plate beneath the lithosphere.

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“…However, outcrops of Archean basement rocks (e.g. Kongling Complex) are rare in the Yangtze block [25][26][27][28]. Even so, recent studies have shown that there are chronological records of 1.8-2.1Ga tectonothermal events in the Yangtze block [29][30][31][32][33][34][35][36][37][38].…”

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confidence: 99%

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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Contrasting geochemical and Sm-Nd isotopic compositions of Archean metasediments from the Kongling high-grade terrain of the Yangtze craton: evidence for cratonic evolution and redistribution of REE during crustal anatexis

Cited by 594 publications

References 51 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

Zircon U–Pb, molybdenite Re–Os and muscovite Ar–Ar isotopic dating of the Xitian W–Sn polymetallic deposit, eastern Hunan Province, South China and its geological significance

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

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