Single zircon ages from high-grade rocks of the Jianping Complex, Liaoning Province, NE China

Kröner, Alfred; Cui, Weilong; Wang, S.Q; Wang, C.Q; Nemchin, A. A.

doi:10.1016/s0743-9547(98)00033-6

Cited by 216 publications

(62 citation statements)

References 32 publications

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“…With the development of in situ microscopic dating techniques with highprecision, it is further confirmed that metamorphism of high-amphibolite to granulite facies of late Neoarchean occurred in the NCC basement at ~2.5 Ga and, the interval times between high-grade metamorphism and TTG magmatism are less than 50 Ma, with both being the products of the same tectonic events [26][27][28][29][30]. This is also indicated by the ages of the mantle and rim constraining metamorphism of granulite facies and anatexis within 2472-2507 Ma and the time spans between metamorphism and magamatism being generally in the ranges of 20-40 Ma. Nowadays, both island arc model [31][32][33][34][35][36] and mantle plume model [37][38][39] have been used to interpret the formation of continental crust.…”

Section: Discussionmentioning

confidence: 99%

Zircon U-Pb geochronology of Archean high-grade metamorphic rocks from Xi Ulanbulang area, central Inner Mongolia

Dong

Liu

et al. 2012

Sci. China Earth Sci.

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The early Precambrian high-grade metamorphosed basement in the Xi Ulanbulang area, central Inner Mongolia of China, is composed mainly of intermediate granulites and charnockitic gneisses. Both types of the rocks are closely associated spatially and temporally, with a gradual variation between them. In order to understand timing of the high-grade metamorphism, we carried out SHRIMP U-Pb dating of zircons of the rocks. Zircons from the granulites and charnockitic gneisses are similar in structure and age. Zircon cores show magmatic zoning and have ages of 2507-2545 Ma. The ages are interpreted as the forming time of protolith of the granulites and charnockitic gneisses, indicating that a strong magmatism existed at that time in the Yinshan Block. The zircon mantles and rims show homogeneous structures and record a strong granulite facies metamorphism event around 2500 Ma, with a time interval between the metamorphism and magamatism being less than 50 Ma. These suggest that the Western Block was similar to the Eastern Block in tectono-thermal timing at the end of the Neoarchean. Xi Ulanbulang, high-grade metamorphic rocks, zircon, SHRIMP U-Pb dating Citation: Dong X J, Xu Z Y, Liu Z H, et al. Zircon U-Pb geochronology of Archean high-grade metamorphic rocks from Xi Ulanbulang area, central Inner Mongolia.

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Section: Discussionmentioning

confidence: 99%

Zircon U-Pb geochronology of Archean high-grade metamorphic rocks from Xi Ulanbulang area, central Inner Mongolia

Dong

Liu

et al. 2012

Sci. China Earth Sci.

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“…The Neoarchean (2.9-2.5 Ga) basement outcrops widely and is dominated by ∼2.7-2.6 Ga TTG gneisses and gneissic monzogranites, accounting for 80% of the total Precambrian basement in the TSGT (Jahn et al, 1988;Kröner et al, 1998;Zhang et al, 2001). Minor ∼2700-2600 Ma ultramafic to felsic volcanic and sedimentary rocks, collectively defined as the Taishan greenstone belt, occur as lenses within the TTG gneisses (Xu et al, 1992;Cao et al, 1996;Zhang et al, 2001).…”

Section: Geological Setting and Petrographymentioning

confidence: 99%

Geochronology and geochemistry of late Archean adakitic plutons from the Taishan granite–greenstone Terrain: Implications for tectonic evolution of the eastern North China Craton

Peng

2012

Precambrian Research

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“…Common Pb was corrected with measured 204 Pb of standard (TEM). Detailed analytical procedures have been described by Compston et al (1984Compston et al ( , 1992 and Kröner et al (1998). The data were analyzed with Ludwig's SQUID 1.02 and ISOPLOT 2.06 (Ludwig 1999).…”

Section: Sampling and Analytical Techniquesmentioning

confidence: 99%

Timing of initiation of extension in the Tianshan, based on structural, geochemical and geochronological analyses of bimodal volcanism and olistostrome in the Bogda Shan (NW China)

Shu

Wang

Zhu

et al. 2010

Int J Earth Sci (Geol Rundsch)

148

121

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International audienceThis paper describes an olistostrome formation and accompanied bimodal volcanic rocks occurring in the Baiyanggou area, south of Bogda Shan. The main lithotectonic units consist of olistostrome, volcanic rocks and turbidite. The olistostrome is tectonically underlain by Upper Carboniferous limestone and sandstone along a NEE-trending detachment fault. Paleo-growth fault is locally observed. The olistostrome unit includes plenty of blocks of limestone, sandstone, rhyolite and volcaniclastic rocks, and a matrix of graywacke. Limestone blocks are dated as Pennsylvanian-Bashkirian in age by the coral and brachiopod fossils that are extensively recognized in the Upper Carboniferous strata. The volcanic unit consists of pillowed and massive basalt and rhyolite, the latter occur as an 8- to 10-meter-thick layer above the olistostrome unit. The turbidite unit is mainly composed of chert, siliceous mudstone and sandstone, within which the Bouma sequence can be locally recognized. Meter-wide gabbro and diabase dykes intrude these three units. Geochemically, rhyolites are characterized by high ACNK value of >1.1, depletion of Ba, Nb and Sm, and enrichment in Rb, Th and Zr. Basaltic rocks are rich in K2O, they show a LREE-enriched pattern and depletion in Ba, Nb and Zr, and enrichment in Ti, Ce and Hf, similar to continental rift-type tholeiite series. A gabbro porphyrite intruding the olistostrome was dated at 288 ± 3 Ma by a sensitive high-resolution ion microprobe (SHRIMP) zircon U-Pb method, and a rhyolite at 297 ± 2 Ma by a laser ablation inductively coupled plasma mass spectrometer (LA-ICPMS) zircon U-Pb method. The Baiyanggou olistostrome and accompanying bimodal volcanic series are linked to an extensional setting that developed in the south of the Bogda Shan. Several lines of evidence, e.g. occurrence of large-scale strike-slip shear zones, large number of mantle-derived magmatic rocks and available geochronological data, demonstrate a significant geodynamic change from convergence to extension in the Chinese Tianshan belt, even in the whole Central Asian Orogenic Belt. The extension in the Chinese Tianshan belt is initiated at ca. 300 Ma, i.e. around Carboniferous-Permian boundary times, and the peak period of intra-plate magmatism occurred in the interval of 300-250 Ma

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Single zircon ages from high-grade rocks of the Jianping Complex, Liaoning Province, NE China

Cited by 216 publications

References 32 publications

Zircon U-Pb geochronology of Archean high-grade metamorphic rocks from Xi Ulanbulang area, central Inner Mongolia

Zircon U-Pb geochronology of Archean high-grade metamorphic rocks from Xi Ulanbulang area, central Inner Mongolia

Geochronology and geochemistry of late Archean adakitic plutons from the Taishan granite–greenstone Terrain: Implications for tectonic evolution of the eastern North China Craton

Timing of initiation of extension in the Tianshan, based on structural, geochemical and geochronological analyses of bimodal volcanism and olistostrome in the Bogda Shan (NW China)

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