Petrochemistry and Sr, Pb, and Nd isotopic geochemistry of early precambrian rocks, Wutaishan and Taihangshan areas, China

Sun, Min; Armstrong, R. L.; Lambert, R. St J.

doi:10.1016/0301-9268(92)90081-x

Cited by 106 publications

(60 citation statements)

References 26 publications

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“…CHUR = chondritic uniform reservoir. Solid circles (CHs) are data of Chinese samples rocks (Jahn and Zhang, 1984;Xuan et al, 1986;Jahn et al, 1987Jahn et al, , 1988Jahn and Ernst, 1990;Li et al, 1990;Wang et al, 1990;Sun et al, 1992Sun et al, , 1993Hu et al, 1991;Rämö et al, 1995;Bai and Dai, 1996). The point of Japanese sample (open circle) is from Shimizu et al (1996).…”

Section: Model Ages and Initial Isotopic Ratios And Sourcesmentioning

confidence: 99%

Crustal evolution history of Korean Peninsula in East Asia: The significance of Nd, Ce isotopic and REE data from the Korean Precambrian gneisses.

et al. 2001

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The Precambrian basement of the Korean Peninsula, located at the east margin of Asian continent, consists of the Nangrim Massif, the Gyeonggi Massif and the Sobaegsan (Yeongnam) Massif. Two kinds of orthogneisses (biotite gneiss and granitic gneiss) from the central part of the Sobaegsan Massif show the particular difference in geochemical features suggesting the discrimination in formation history. The biotite gneisses give an Sm-Nd whole rock isochron age of 819 ± 114 Ma (2σ) with ε Nd (0.82 Ga) = -15, and the granitic gneisses give an age of 1484 ± 810 Ma (2σ) with ε Nd (1.48 Ga) = +7. The ε Nd and ε Ce values for the granitic gneisses show characteristics of highly depleted mantle material and those of the biotite gneisses show their sources having light-REE enriched continental-like feature. Chondrite-normalized REE patterns are also different. Biotite gneisses have less fractionated patterns with (La/Yb) N ratio of 10~16 and negative Eu anomalies, while granitic gneisses have fractionated patterns with (La/Yb) N ratio of 30~180 with no/or positive Eu anomalies. The Ce-Nd isotopic results obtained here indicate that the Sobaegsan biotite gneisses were derived from continental-like sources having light-REE enriched feature, while the Sobaegsan granitic gneisses were derived from MORB-like sources having light-REE-depleted feature. These isotopic and REE data are interpreted as recording LREE fractionation events associated with major episodes of crust formation in East Asia. And the comparison of the initial ε Nd value of the Sobaegsan biotite gneiss at 0.82 Ga with those of the Chinese and Japanese Precambrian rocks implies that the sources for the Sobaegsan biotite gneisses and these Chinese and Japanese rocks had common light-REE enriched pattern, e.g., 147 Sm/ 144 Nd ratio ranging from 0.09-0.13. Furthermore, it suggests that these sources having light-REE enriched patterns were derived from depleted mantle at the late Archean.

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Section: Model Ages and Initial Isotopic Ratios And Sourcesmentioning

confidence: 99%

Crustal evolution history of Korean Peninsula in East Asia: The significance of Nd, Ce isotopic and REE data from the Korean Precambrian gneisses.

et al. 2001

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“…Early Precambrian metamorphic crystalline basement rocks are well preserved in the southern margin of the NCC (Sun et al, 1992;Zhao et al, 1998Zhao et al, , 2001Wilde et al, 2002;Zhao et al, 2002), making it an ideal terrane to investigate the evolution of the NCC. The basement is composed of TTG gneiss, metamorphosed supracrustal rocks (including greenstone belt), basic dyke swarms and K-rich GGM suites.…”

Section: Introductionmentioning

confidence: 99%

Geochronology and geochemistry of 2.5 to 2.4Ga granitic plutons from the southern margin of the North China Craton: Implications for a tectonic transition from arc to post-collisional setting

et al. 2011

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“…The Baiqi adakitic rocks have remarkably different 87 Sr/ 86 Sr ratios and ε Nd(t) values from that of the Precambrian lower crustal xenoliths (Huang et al, 2004;Liu et al, 2004;Yu et al, 2003) and granulite-TTGkhondalite exposed on the Earth's surface (Jahn et al, 1988;Jahn and Zhang, 1984;Liu et al, 2004;Sun et al, 1992) at 125 Ma (Fig. 5), which demonstrate clearly that the Baiqi adakitc rocks were not formed by anatexis of the Precambrian lower continental crust.…”

Section: Links Between Partial Melting Of Thickened Lower Crust and Bmentioning

confidence: 93%

“…Third, although the Baiqi adakitic rocks have various SiO 2 contents from 57 to 71%, their Sr and Nd isotopic compositions are remarkably homogeneous (Table 2). This is the most important, because the homogeneous Sr and Nd isotopic compositions suggest that the Baiqi formation derived from one magma chamber, and were not contaminated significantly by evolved old basement rocks such as 1.9 Ga or 2.5 Ga lower crustal xenoliths from Hannuoba and Nushan (Huang et al, 2004;Yu et al, 2003) or Archean terrane granulites (Jahn et al, 1988;Jahn and Zhang, 1984;Liu et al, 2004;Sun et al, 1992) (Fig. 5).…”

Section: The Case Of Thickened Lower Continental Crust-derived Adakitmentioning

confidence: 99%

“…It remains to resolve whether or not adakitic rocks can be produced by this kind of anatexis in post-orogenic tectonic settings. Nevertheless, the remarkably homogeneous Sr-Nd isotopic compositions for the Baiqi adakitic rocks preclude the possibility that they were produced by the melting of orogenic lithospheric keel that has sandwich-layers composed of felsic and maficultramafic rocks like those in the Dabie orogen (Zhao et al, 2004 (Cai et al, 2003;Chen et al, 2004;Zhang et al, 2004), lower crustal xenoliths from Nushan (Huang et al, 2004;Yu et al, 2003), granulite xenoliths from Hannuoba Zhang et al, 1998;Zhou et al, 2002), Archean TTG (Jahn et al, 1988;Jahn and Zhang, 1984;Sun et al, 1992), peridotite xenoliths from Hannuoba are shown for comparison.…”

Section: The Case Of Thickened Lower Continental Crust-derived Adakitmentioning

confidence: 99%

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Mesozoic adakites in the Lingqiu Basin of the central North China Craton: Partial melting of underplated basaltic lower crust

Wang

Liu

2006

Geochem. J.

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Intermediate to felsic volcanic rocks of the Baiqi formation from the Lingqiu basin in the central part of North China Craton were studied. Single zircon U-Pb dating indicates that these volcanics formed at 125.8 ± 3.0 Ma. Their Sr and Nd isotopic compositions ( 143 Nd/ 144 Nd = 0.51180-0.51182, 87 Sr/ 86 Sr = 0.7062-0.7063) fall in the range of the nearby lateMesozoic basaltic rocks. These volcanics share geochemical affinities to the adakites formed in the modern arcs, e.g., high Na 2 O (>4.06%), Al 2 O 3 (>15.4%) and Sr (645-1389 ppm) contents and Sr/Y ratios (55~103), and thus being termed as adakitic rocks. However, the Baiqi adakitic rocks were not temporospatially associated with active subduction. Furthermore, their low Cr (2.19-47.4 ppm, with average of 25) and Ni (1.57-20.7 ppm, with average of 12) contents and Mg# (22-47, with average of 32) argue against interaction with the lithospheric mantle. Combined with the geological setting, we suggest that the Baiqi adakitic rocks resulted from partial melting of a thickened lower continental crust associated two episodes of basaltic underplating events. We propose that enormous conductive heating from 80-140 Ma basaltic underplating resulted in partial melting of pre-existing mafic lower crust formed by ~150-160 Ma basaltic underplating. This study provides a case for partial melting of the thickened lower continental crust in association with basaltic underplating events.

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Petrochemistry and Sr, Pb, and Nd isotopic geochemistry of early precambrian rocks, Wutaishan and Taihangshan areas, China

Cited by 106 publications

References 26 publications

Crustal evolution history of Korean Peninsula in East Asia: The significance of Nd, Ce isotopic and REE data from the Korean Precambrian gneisses.

Crustal evolution history of Korean Peninsula in East Asia: The significance of Nd, Ce isotopic and REE data from the Korean Precambrian gneisses.

Geochronology and geochemistry of 2.5 to 2.4Ga granitic plutons from the southern margin of the North China Craton: Implications for a tectonic transition from arc to post-collisional setting

Mesozoic adakites in the Lingqiu Basin of the central North China Craton: Partial melting of underplated basaltic lower crust

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