Silurian-Devonian provenance changes of South Qinling basins: implications for accretion of the Yangtze (South China) to the North China cratons

Gao, Shan; Benren, Zhang; Gu, X.; Xie, Qianli; Gao, Changlin; Gao, Xiaoming

doi:10.1016/0040-1951(95)00051-5

Cited by 131 publications

(68 citation statements)

References 37 publications

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“…The analysis of major elements was conducted with X-ray fluorescence spectrometry (XRF) with a Regaku3080E1-type spectrometer at the Geological Experiment Center of Hubei Province. The accuracy of the sample analysis was 1% [43]. Trace elements were analyzed with an inductively coupled plasma mass spectrometer (ICP-MS, Agilent7500a) at the State Key Laboratory of Geological Processes and Mineral Resources in China University of Geosciences (Wuhan).…”

Section: Methodsmentioning

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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Section: Methodsmentioning

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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“…Major elements were determined by gravimetry and AAS (wet chemistry) (analytical procedure described in detail by Gao et al, 1995). Trace elements, including the rare earth element (REE), were analyzed by a Perkin-Elmer ELAN 6000 inductivelycoupled plasmu source mass spectrometer (ICP-MS) at the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences.…”

Section: Methodsmentioning

confidence: 99%

Cretaceous high-potassium intrusive rocks in the Yueshan-Hongzhen area of east China: Adakites in an extensional tectonic regime within a continent

et al. 2004

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Adakites are generally associated with subduction zones (i.e., at convergent plate margins). This paper reports geochemical and isotopic data for early Cretaceous high-potassium adakitic intrusive rocks in the Yueshan-Hongzhen area of east China, which occur in an extensional tectonic regime within a continent. Based on petrology and geochemistry, these adakitic intrusive rocks are classified into two groups. One group (the Hongzhen adakitic granites) is characterized by high SiO 2 (69-75%) contents and K 2 O/Na 2 O (>1.0), low MgO (or Mg # ) values, Ni and V concentrations, low ε Nd (t) (-17.01~-18.13), and high ( 87 Sr/ 86 Sr) i (0.7071~0.7072). The other group (the Yueshan and Zongpu adakitic rocks) is characterized by relatively low SiO 2 (58-67%) contents and K 2 O/Na 2 O (<1.0), high MgO (Mg # ) values, Ni and V concentrations, as well as relatively high ε Nd (t) (-6.63~-9.62) and low ( 87 Sr/ 86 Sr) i (0.7064~0.7069). Both groups are associated with the contemporary Dongling metamorphic core complex, A-type granites, and some per-alkaline igneous rocks that are formed only in an extensional setting. The tectonic setting and chemical compositions suggest that: (1) the adakitic intrusive rocks in the Yueshan-Hongzhen area were formed in an extensional tectonic regime within a continental plate; (2) the Hongzhen adakitic granites were most likely derived directly from partial melting of mafic material with high potassium contents at the base of the continental crust at pressures of ~1.2 GPa, leaving residual garnet ± hornblende ± plagioclase in the source; (3) the Yueshan and Zongpu adakitic rocks were most probably derived from dehydration melting of basaltic materials delaminated into underlying mantle at pressures >1.2 GPa, leaving residual garnet + pyroxene in their sources. Both groups of adakitic rocks have high La/Yb and Sr/Y, indicating that the crustal thickness in the YueshanHongzhen area exceeded 40 km when the adakitic magmas were generated in the early Cretaceous. The present thickness of the crust in the Yueshan-Hongzhen area is only ~31 km, and therefore the crust appears to have been thinned by at least 10 km since the early Cretaceous. The relatively high MgO, Ni, and V values of the Yueshan and Zongpu adakitic rocks suggest that adakitic magmas interacted with mantle rocks, possibly concurrently with delamination of the lower crust.Keywords: adakite, delamination, lower crust, high potassium, east China geochemical similarity Drummond and Defant, 1990;Martin, 1999). However, some rocks with adakitic compositional features have been argued to be alternative origins, e.g., partial melting of mafic lower crust (Atherton and Petford, 1993;Muir et al., 1995;Petford and Atherton, 1996;Johnson et al., 1997), assimilation and fractional crystallization (AFC) processes involving basaltic magmas (Feeley and Hacker, 1995;Wareham et al., 1997;Castillo et al., 1999). Experimental studies (e.g., Rapp et al., 1991Rapp et al., , 1999Sen and Dunn, 1994;Rapp, 1995; Rapp and Waston, 1995;Springer and Seck, 19...

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“…However, the time when the amalgamation between the NCB and SCB began and ended along the Qinling-Dabie-Sulu orogen has been disputed for many years Liu et al, 2013;Ratschbacher et al, 2003). For example, the accretion of the SCB to NCB was suggested to occur along the Shangdan suture zone in Silurian-Devonian following the fact that the South Qinling belt (SQB) began to receive sediments from the North Qinling in middle Paleozoic (Gao et al, 1995;Kröener et al, 1993;Zhang et al, 1997). In contrast, paleomagnetic data (Enkin et al, 1992;Yang et al, 1992), together with ultrahigh-pressure metamorphism at 230 Ma in the easternmost Qinling-Dabie belt (Ames et al, 1996;Hacker et al, 1998;Okay et al, 1993) blocks.…”

Section: Introductionmentioning

confidence: 99%

Provenance and tectonic-paleogeographic evolution: Constraints from detrital zircon U–Pb ages of Late Triassic-Early Jurassic deposits in the northern Sichuan basin, central China

Shao

Cheng

Song

2016

Journal of Asian Earth Sciences

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Silurian-Devonian provenance changes of South Qinling basins: implications for accretion of the Yangtze (South China) to the North China cratons

Cited by 131 publications

References 37 publications

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

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

Cretaceous high-potassium intrusive rocks in the Yueshan-Hongzhen area of east China: Adakites in an extensional tectonic regime within a continent

Provenance and tectonic-paleogeographic evolution: Constraints from detrital zircon U–Pb ages of Late Triassic-Early Jurassic deposits in the northern Sichuan basin, central China

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