LA-ICP-MS U–Pb zircon geochronology and geochemistry of Paleoproterozoic mafic dykes from western Shandong Province: Implications for back-arc basin magmatism in the Eastern Block, North China Craton

Wang, Yuejun; Zhao, Guochun; Wu, Fan; Peng, Touping; Sun, Linhua; Xia, Xiaoping

doi:10.1016/j.precamres.2006.12.010

Cited by 80 publications

(39 citation statements)

References 57 publications

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“…Such signatures, combined with MgO of 8.82-12.07 wt.%, P 2 O 5 /Al 2 O 3 of 0.002-0.004 and Gd/Yb of 1.9-2.0 (Table 2), are most likely inherited from a garnet-bearing, orthopyroxene-rich source that had previously experienced melt extraction (e.g., Hirose, 1997;Wang et al, 2007cWang et al, , 2013a. Group 1 samples show enrichment in LILEs and depletion in HFSEs with pronounced negative Nb-Ta and Zr-Hf anomalies (Fig.…”

Section: Petrogenesis Of the Ailaoshan Amphibolitementioning

confidence: 99%

Neoproterozoic subduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite

Cai

Wang²,

Cawood

et al. 2014

Precambrian Research

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105

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a b s t r a c tLenses of amphibolites occur along the Ailaoshan suture zone at the southwestern margin of the Yangtze Block, South China. Petrological, geochemical and zircon U-Pb geochronological data indicate that they are divisible into two coeval groups. Group 1, represented by the Jinping amphibolite, has mg-number of 71-76 and (La/Yb)cn ratios of 7.2-7.7, and displays a geochemical affinity to island arc volcanic rocks. Group 2 amphibolites occur at Yuanyang and are characterized by high Nb contents (14.3-18.4 ppm), resembling Nb-enriched basalts. The ε Nd (t) values for Group 1 range from −3.45 to −2.04 and for Group 2 from +4.08 to +4.39. A representative sample for Group 1 yields a U-Pb zircon age of 803 ± 7 Ma, whereas two samples for Group 2 give U-Pb zircon ages of 813 ± 11 Ma and 814 ± 12 Ma. Petrogenetic analysis suggests that Group 1 originated from an orthopyroxene-rich source and Group 2 from a mantle wedge modified by slab-derived melt. In combination with other geological observations, these amphibolites are inferred to constitute part of an early Neoproterozoic (∼815-800 Ma) arc-back-arc basin system. The Neoproterozoic amphibolites and related rocks along the Ailaoshan zone may be the southward extension of the Neoproterozoic supra-subduction zone that developed along the western margin of the Yangtze Block.

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Section: Petrogenesis Of the Ailaoshan Amphibolitementioning

confidence: 99%

Neoproterozoic subduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite

Cai

Wang²,

Cawood

et al. 2014

Precambrian Research

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105

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“…There are many records of Paleoproterozoic large-scale tectonothermal events associated with amalgamation and breakup of the Columbia supercontinent in the North China block [10,15,24]. The latest research shows that there are many chronological records of the widespread 2.1-1.8 Ga tectonothermal events in the Yangtze block.…”

Section: Tectonic Significance Of Paleoproterozoic Rapakivi Granites mentioning

confidence: 99%

“…Archean rocks are widely exposed in the North China block, and there are many records of the Proterozoic tectonothermal events related to the amalgamation and breakup of the Columbia supercontinent [10,[15][16][17][18][19][20][21][22][23][24], including the Miyun Proterozoic typical rapakivi granites in Beijing [5][6][7]10]. However, outcrops of Archean basement rocks (e.g.…”

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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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“…The occurrence of these high Fe-Ti mafic intrusive rocks likely reveals that an iron-rich mantle source was present beneath the Trans-North China Orogen and the Western Block in the Precambrian, particularly in the Paleoproterozoic, as pointed out by Wang et al (2004Wang et al ( , 2008. In the Eastern Block, although some Paleoproterozoic (∼1.84 Ga) mafic dykes have been reported by Wang et al (2007), these rocks do not possess a high Fe-Ti signature. On the contrary, they originated from a depleted rather than an enriched mantle source .…”

Section: Introductionmentioning

confidence: 90%

“…As a result, it is necessary to assess the effect of accumulation, Taylor and McLennan (1985) and Sun and McDonough (1989), respectively. The data for N-MORB and OIB are from Sun and McDonough (1989); the 1.84 Ga, 1.31, 1.77 Ga mafic dykes in the NCC from Wang et al (2007), Zhang et al (2012) and Wang et al (2004Wang et al ( , 2008; and the mafic xenolith of the NCC from the lower crust from Liu et al (2001). fractional crystallization and crustal contamination before discussing their mantle source and petrogenesis.…”

Section: Petrogenesismentioning

confidence: 99%

Mesoproterozoic high Fe–Ti mafic magmatism in western Shandong, North China Craton: Petrogenesis and implications for the final breakup of the Columbia supercontinent

Peng

Wilde

et al. 2013

Precambrian Research

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LA-ICP-MS U–Pb zircon geochronology and geochemistry of Paleoproterozoic mafic dykes from western Shandong Province: Implications for back-arc basin magmatism in the Eastern Block, North China Craton

Cited by 80 publications

References 57 publications

Neoproterozoic subduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite

Neoproterozoic subduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite

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

Mesoproterozoic high Fe–Ti mafic magmatism in western Shandong, North China Craton: Petrogenesis and implications for the final breakup of the Columbia supercontinent

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