Tracing the protolith, UHP metamorphism, and exhumation ages of orthogneiss from the SW Sulu terrane (eastern China): SHRIMP U–Pb dating of mineral inclusion-bearing zircons

Liu, Fulai; Xu, Zhiqin; Xue, Haitao

doi:10.1016/j.lithos.2004.08.001

Cited by 134 publications

(95 citation statements)

References 51 publications

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“…Mineral inclusions in zircons from high-grade metamorphic rocks are useful for understanding the origin and P-T condition of zircon (re)crystallization (Liu et al, 2004). All the mineral inclusions in zircons from sample TL1201 and L01 were analyzed by Laser Raman spectroscopy, and the results are showed in Fig.…”

Section: Metamorphic Evolution Of the Qiangtang Hp Basic Granulitementioning

confidence: 99%

Silurian high-pressure granulites from Central Qiangtang, Tibet: Constraints on early Paleozoic collision along the northeastern margin of Gondwana

Zhang

Dong

Cai

et al. 2014

Earth and Planetary Science Letters

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Section: Metamorphic Evolution Of the Qiangtang Hp Basic Granulitementioning

confidence: 99%

Silurian high-pressure granulites from Central Qiangtang, Tibet: Constraints on early Paleozoic collision along the northeastern margin of Gondwana

Zhang

Dong

Cai

et al. 2014

Earth and Planetary Science Letters

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“…The lithology types have been confirmed by core recovery of 112 drill hole samples in laboratory from 220 to 4000 miles, are mainly eclogite, paragneiss, orthogneiss, amphibolites, serpentinite, and granite (Zhang et al 2000(Zhang et al , 2003Ya et al 2000;Liu et al 2004Liu et al , 2005.…”

Section: Methods Applicationmentioning

confidence: 89%

The classification in metamorphic rocks using modified fuzzy cluster analysis from geophysical log data: evidence from Chinese Continental Scientific Drilling Main Hole

Yang

Pan

Luo

et al. 2015

J Petrol Explor Prod Technol

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Lithology is one of the most important data in evaluating reservoir, and is mainly carried out by cores recovery in laboratory which is very expensive, and its interpretation is time consuming. Accurate identification of lithology is fundamentally crucial to evaluate reservoir from geophysical log data. Pattern recognition and statistical analysis have been proved to be the most powerful methods for constructing optimal model in lithology recognition. To address this issue, a fast and practical K-means clustering algorithm is proposed in order to better deal with lithology recognition from geophysical log data. Based on the traditional K-means clustering algorithm, Euclidean distance is replaced by Mahalanobis distance; the initial cluster centers are acquired from the average of characteristic values but not selected randomly, in addition, adding weight value in each characteristic value of the objective function, and thus a lithology recognition model named modified K-means clustering is established. The method is applied to identify the Chinese Continental Scientific Drilling Main Hole (CCSD-MH) metamorphic rocks. Compared with the traditional K-means clustering, the accurate rate of the modified K-means clustering in lithologic identification has improved for the same 45 samples, raised 11.11 %. According to the modified K-means cluster algorithm, nine kinds of lithology cluster centers are acquired from 45 samples. The classes of the samples can be determined by analyzing the hamming approach degree curves, which is calculated by the undetermined samples and 9 cluster centers. The predicted results and the core recovery are exactly the same by comparison. The hamming approach degree can identify the whole well of CCSD-MH lithology effectively and accurately. This model may be made applications to other areas.

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“…Some of the metabasalts display geochemical features of normal mid-ocean ridge basalts (N-MORB) [13,14]. They underwent metamorphism in the Triassic (242 to 221 Ma) [15], which is consistent with UHP metamorphic ages of 240 to 225 Ma in the Dabie-Sulu orogenic belt [7,[16][17][18][19][20][21][22].…”

Section: Geological Setting and Samplesmentioning

confidence: 87%

Zircon U-Pb ages of granites at Changba and Huangzhuguan in western Qinling and implications for source nature

Wang

Sun

et al. 2011

Chin. Sci. Bull.

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Mesozoic granitoids are widespread in the Qinling-Dabie-Sulu orogenic belt. Precise U-Pb dating on these granitoids can reveal the evolution of the continental collision orogen and thus provide information on the nature of magma sources. This study presents zircon LA-ICP-MS U-Pb dating and whole-rock geochemical analyses for two intrusions at Changba and Huangzhuguan in western Qinling. Zircon U-Pb ages for central and marginal phases of the Huangzhuguang intrusion are 214±1 Ma and 213±3 Ma, respectively. Zircons from the Changba intrusion yield a dominant cluster with an U-Pb age of 213±2 Ma. Collectively, these ages are younger than ages of 220 to 240 Ma for ultrahigh-pressure metamorphism due to the continental collision between the South China Block and the North China Block, corresponding to syn-exhumation magmatism. Some inherited zircons occur in the Changba intrusion, yielding a weighted mean of 206 Pb/ 238 U ages at 757±14 Ma. This indicates that the Changba intrusion has the crustal source of mid-Neoproterozoic ages and a tectonic affinity to the South China Block. Geochemically, the two intrusuons are both rich in LILE and LREE but depleted in HFSE and HREE, similar to arc-type igneous rocks. The Huangzhuguang intrusion exhibits linear correlations between SiO 2 and the other major oxides, implying chemical evolution from a cognate magma source. It contains mafic enclaves, suggesting possible mixing of felsic-mafic magmas. The Changba granite is rich in Si and K but poor in Fe and Mg as well as has a high value of Fe*, suggesting strong differentiation of granitic magma. Therefore, the two intrusions were derived from the Late Triassic anatexis of the continental crust of different compositions in the northern margin of South China Block. This process may be coupled with exhumation of the subducted continental crust in the stage of late collision.Qinling orogen, continental collision, granite, zircon U-Pb dating, whole-rock geochemistry, syn-exhumation magmatism Citation:Wang T G, Ni P, Sun W D, et al. Zircon U-Pb ages of granites at Changba and Huangzhuguan in western Qinling and implications for source nature.

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Tracing the protolith, UHP metamorphism, and exhumation ages of orthogneiss from the SW Sulu terrane (eastern China): SHRIMP U–Pb dating of mineral inclusion-bearing zircons

Cited by 134 publications

References 51 publications

Silurian high-pressure granulites from Central Qiangtang, Tibet: Constraints on early Paleozoic collision along the northeastern margin of Gondwana

Silurian high-pressure granulites from Central Qiangtang, Tibet: Constraints on early Paleozoic collision along the northeastern margin of Gondwana

The classification in metamorphic rocks using modified fuzzy cluster analysis from geophysical log data: evidence from Chinese Continental Scientific Drilling Main Hole

Zircon U-Pb ages of granites at Changba and Huangzhuguan in western Qinling and implications for source nature

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