When did the ultrahigh-pressure rocks reach the surface? A 207Pb/206Pb zircon, 40Ar/39Ar white mica, Si-in-white mica, single-grain provenance study of Dabie Shan synorogenic foreland sediments

Grimmer, Jens C.; Ratschbacher, Lothar; McWilliams, Michael; Franz, Leander; Gaitzsch, Ines; Tichomirowa, Marion; Hacker, Bradley R.; Zhang, Yueqiao

doi:10.1016/s0009-2541(02)00321-2

Cited by 115 publications

(100 citation statements)

References 55 publications

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“…The ages of ~ 2.5 Ga, 2.0 Ga and 1.8 Ga correspond to important episodes of regional continental crust growth (Grimmer et al, 2003;Tung et al, 2007Tung et al, , 2008. Therefore, the different curves in Fig.…”

Section: Modellingmentioning

confidence: 99%

Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Huang

Niu

2017

Lithos

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Section: Modellingmentioning

confidence: 99%

Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Huang

Niu

2017

Lithos

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“…The South China and North China Blocks (NCB) sutured during the late Middle Triassic to Middle Jurassic interval along the Qinling-Dabie and Sulu orogen [Li, 1998;Grimmer et al, 2003]. However, the former has a more complex tectonic history than the latter and consists of two major Precambrian continental blocks: the Yangtze Block to the northwest, and the Cathaysia Block to the southeast (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Relict Proterozoic basement in the Nanling Mountains (SE China) and its tectonothermal overprinting

Xu¹,

O’Reilly

Griffin³

et al. 2005

Tectonics

116

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The basement beneath the Caledonian belt in SE China has been overprinted by Indosinian and Yanshanian events and is poorly known. In situ U‐Pb and Hf‐isotope analysis of zircons from granites and surrounding rocks in the Nanling Mountains area of the fold belt reveal that the Lanhe felsic gneiss is an outcrop of Mesoproterozoic basement, probably with a partly Late Archean protolith. This is consistent with Nd model ages of granites in this region, and exposures of Cathaysia basement in the coastal area of SE China. In the Nanling Mountains, this basement was reactivated to generate granitoid rocks during the Caledonian, Indosinian, and Yanshanian tectonothermal events. The Caledonian overprint is documented in extensive exposures of the Zhuguang migmatites (425–470 Ma) and by previous U‐Pb zircon dating of adjacent granites. The Jiangnan granite may be of similar age, but strongly reworked. The Indosinian overprint resulted in the formation of granites such as the Luxi and Xiazhuang bodies (233–246 Ma) in the Guidong complex. The Yanshanian overprint produced the most widely distributed granites (circa 160 Ma) such as the Jiufeng and Fogang bodies, and parts of the Guidong complex. Hf‐isotope data show that all of the Phanerozoic magmatic rocks were derived from the Mesoproterozoic basement (and minor Archean components), without obvious contributions from juvenile sources. The presence of zircons with Archean age (2.5–2.7 Ga) in both the Lanhe gneiss and Devonian sediments indicates that the Badu and Mayuan groups may not be the oldest basement of the Cathaysia block. Some Archean basement (circa 2.5–2.7 Ga) may still be exposed but unrecognized in this region, and Cathaysia may include Archean microcontinental fragments.

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“…Yang et al [68] obtained the similar zircon age spectra in the Early and Middle Jurassic sandstones from Huangshi, but the Early Jurassic sandstones exhibit no 200-300 Ma grain and a few of 400-500 Ma grains. The test results in Yueshan basin by Grimmer et al [69] also show that the Early Jurassic sandstones exhibit very few 200-300 Ma grains and no 2400-2500 Ma grain. Based on the above detrital zircon dating results and Ar-Ar chronological and geochemical analyses of white mica and high-Si-white mica, the scientists [67,69] thought that the Jurassic basin at the southern margin of the Dabie range had two source areas, that is, the main Dabie orogen source in the north and the JNFB source in the south [67][68][69].…”

Section: Isotopic Chronology Analysismentioning

confidence: 89%

“…Based on the above detrital zircon dating results and Ar-Ar chronological and geochemical analyses of white mica and high-Si-white mica, the scientists [67,69] thought that the Jurassic basin at the southern margin of the Dabie range had two source areas, that is, the main Dabie orogen source in the north and the JNFB source in the south [67][68][69]. According to the zircon and high-Si-white mica grains of 200-300 Ma exhibiting in the Early and Middle Jurassic strata, they also concluded that the HP/UHP rocks were unroofed and transported into the Southeast Hubei basin in the Early Jurassic [67,69]. As for no 200-300 Ma zircon and high-Si-white mica grains in the Late Triassic strata, some people identified that the sediment sources were mainly from the JNFB [67].…”

Section: Isotopic Chronology Analysismentioning

confidence: 99%

Mesozoic basin development and its indication of collisional orogeny in the Dabie orogen

Liu

Zhang

2012

Chin. Sci. Bull.

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The Dabie orogen underwent deep continental subduction, rapid exhumation, and the huge amount of erosion during the Mesozoic. Its tectonic evolution, especially how its evolution was recorded by sedimentary basins at the flanks of the Dabie orogen is one of the most important issues of the world's attention. These years, newly studies of basin sedimentology, combined with structural geology, have shown a fundamental progress. The overall distribution of different basin types in the orogen indicates that shortening and thrusting at the margins of the orogen from the Late Triassic to the Early Cretaceous controlled the foreland basins, and extension, doming and rifting were initiated in the core of the orogen from the Jurassic to the Early Cretaceous and were expanded to the whole orogen after the Late Cretaceous. Therefore, The Dabie orogen records gradual transition from overall shortening and thrusting to dominantly extension and rift basin formation expanded from its core to its margins, although these shortening and extension overlapped in time from the Jurassic through Early Cretaceous at crustal levels. The unroofing ages of the ultra-high pressure (UHP) metamorphic rocks in the Dabie orogen change from Early Jurassic to Late Jurassic westward. The depth of exhumation increases eastwards. The sediment sources for the Hefei basin are mostly composed of the deeply exhumed, axial Dabie metamorphic complex, and the sediment sources for the Middle Yangtze basin are mostly from cover strata in the southern orogen and related strata with subjacent (i.e. subsequently overthrusted) Mianlue suture belt. Geodynamic analysis represents that continental collision between the North China Block and the South China Block along the Shangdan and Mianlue sutures, subsequently northwestward progradation of the Jiangnan fold and thrust belt, and the underthrusting of the North China Block along the Northern Boundary Fault of Qinling Range led to crustal thickening, gravitational spreading and balanced rebound of the resultant thick crustal welt, and multi-episodic exhumation of the HP/UHP metamorphic rocks. The future studies by the methods of tracing the Dabie orogeny through deposition in the marginal basins should focus on eastward extension of the Mianlue suture, thrust and overlap of the Dabie HP/UHP metamorphic block on different lithotectonic zones and basins along the northern South China Block, the structural framework of the source area of the basins in the syn-depositional stage, the basin lateral extension, huge amount of erosion and sediment transportation from the Dabie blanket and basement rocks, and recovery of subducted and removed structural units within the Dabie orogen, etc.Dabie orogen, sedimentary basin, evolution of basin/mountain system, HP/UHP metamorphic rocks, provenance analysis, exhumation process, depositional paleogeography

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When did the ultrahigh-pressure rocks reach the surface? A 207Pb/206Pb zircon, 40Ar/39Ar white mica, Si-in-white mica, single-grain provenance study of Dabie Shan synorogenic foreland sediments

Cited by 115 publications

References 55 publications

Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau

Relict Proterozoic basement in the Nanling Mountains (SE China) and its tectonothermal overprinting

Mesozoic basin development and its indication of collisional orogeny in the Dabie orogen

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