Sr, Nd, and Pb isotopic compositions of Hainan basalts (south China): Implications for a subcontinental lithosphere Dupal source

Tu, Kan; Flower, Martin F. J.; Carlson, Richard W.; Zhang, Ming; Xie, Ganquan

doi:10.1130/0091-7613(1991)019<0567:snapic>2.3.co;2

Cited by 167 publications

(119 citation statements)

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“…10) (Lan et al, 1995;Lapierre et al, 1997;Li and McCulloch, 1998;Xie et al, 2001Xie et al, , 2006Xiong et al, 2003;Ge et al, 2003; (Peng et al, 1986;Tu et al, 1991Tu et al, , 1992Chung et al, 1994Chung et al, , 1995Liu et al, 1994;Zou et al, 2000;Ho et al, 2003 Figs. 7,11,12).…”

Section: Secular Magma Sources For Basaltic Rocksmentioning

confidence: 99%

“…mantle component (Peng et al, 1986;Flower et al, 1992;Tu et al, 1991Tu et al, , 1992Liu et al, 1994;Qi et al, 1994;Chung et al, 1994Chung et al, , 1995Zou et al, 2000;Ho et al, 2003). It is also generally accepted that Late Cenozoic volcanism in Southeast China was related to lithospheric extension due to asthenospheric upwelling (Chung et al, 1994Qi et al, 1994;Zou et al, 2000;Ho et al, 2003).…”

Section: Secular Magma Sources For Basaltic Rocksmentioning

confidence: 99%

“…It has been proposed the EM 2 mantle component in Southeast China was derived from continental lithospheric mantle such as Tungchihsu Group II pyroxenite (Ho et al, 2000), and related to the subduc- Zindler and Hart (1986). ᭹ Paleocene mafic rocks in Central Jiangxi (this study), Paleocene basalts from Sanshui basin, Guangdong (Zhu and Wang, 1989), The fields of Cretaceous basalts and mafic dikes (e.g., Xie et al, 2001Xie et al, , 2006 and Late Cenozoic basalts (e.g., Peng et al, 1986;Tu et al, 1991Tu et al, , 1992Chung et al, 1995;Zou et al, 2000) in Cathaysia Block are shown for comparison.…”

Section: Magma Sourcementioning

confidence: 99%

“…Ho et al (2003). ᭹ Paleocene mafic rock in Central Jiangxi (this study), Paleocene basalts from Sanshui and Heyuan basin, Guangdong (Chung et al, 1997;Zhu and Wang, 1989;Zhu et al, 2004), The fields of Cretaceous basalts and mafic dikes (e.g., Lan et al, 1995;Lapierre et al, 1997;Li and McCulloch, 1998;Chen et al, 2000;Xiong et al, 2003;Ge et al, 2003;Xie et al, 2006) and Late Cenozoic basalts (e.g., Peng et al, 1986;Tu et al, 1991Tu et al, , 1992Chung et al, 1995;Zou et al, 2000;Ho et al, 2003) (Peng et al, 1986;Tu et al, 1991Tu et al, , 1992Chung et al, 1995;Zou et al, 2000). (4) The SiO 2 and Th contents of continental crust are generally higher than those of mantle-derived melts, and these rocks if significantly influenced by crustal contamination en route, would exhibit positive correlations among SrNd isotopic compositions and SiO 2 or Th (Piccirillo et al, 1989).…”

Section: Petrogenesis: Crustal Contamination or Source Enrichment?mentioning

confidence: 99%

“…Fields of Cretaceous basalts and mafic dikes (e.g., Xie et al, 2001, 2006) and Late Cenozoic basalts (e.g., Peng et al, 1986Tu et al, 1991Tu et al, , 1992Zou et al, 2000) (Zhu and Wang, 1989). The fields of Cretaceous basalts and mafic dikes (e.g., Xie et al, 2001, 2006) and Late Cenozoic basalts (e.g., Peng et al, 1986Tu et al, 1991Chung et al, 1995;Zou et al, 2000) in Cathaysia Block are shown for comparison.…”

Section: Secular Magma Sources For Basaltic Rocksmentioning

confidence: 99%

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K-Ar dating, geochemical and Sr-Nd-Pb isotopic systematics of Paleocene mafic rocks in Central Jiangxi, SE China: Evidence for lithosphere replacement

Xie

Mao

et al. 2006

Geochem. J.

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Geochemical and isotopic studies were carried out on Paleocene mafic rocks in the Taihe Basin, central Jiangxi, Southeast China, in order better to understand their magma sources and tectonic implications. K-Ar dating results show that these mafic rocks intruded during the Paleocene (50-65 Ma). These Paleocene mafic rocks are porphyritic diabase and have similar geochemical features, such as strong enrichment of large ion lithophile element (LILE, e.g., Rb, Ba, Sr), slight enrichment of light rare earth element (LREE) and high field strength element (HFSE, e.g., Nb, Ta, Ti, P). The mafic rocks are also characterized by high rare earth element (REE) and minor Eu anomalies (δEu = 0.88-1.2) and have uniform initial 87 Sr/ 86 Sr (0.7041-0.7064) and Pb isotopic composition ( 206 Pb/ 204 Pb = 18.338-18.677) as well as a relatively wide range of initial Nd isotopic ratios (ε Nd (T)) varying from +0.8 to +6.2. These geochemical characteristics are different from those of subduction-related basalts, but similar to oceanic island basalts (OIB). Geochemical and isotopic evidence suggests that mafic rocks in the Taihe Basin were not significantly affected by crustal contamination and originated from asthenospheric mantle with a minor involvement of EM 2 mantle component. It is noted that Cretaceous basaltic rocks in Southeast China show enriched geochemical and isotopic compositions and were derived from a highly heterogeneous lithospheric mantle with minor asthenosphere components. On the other hand, Late Cenozoic basalts in Southeast China, which display OIB-like geochemical characteristics, were probably generated by melting of depleted asthenospheric mantle (DMM or MORB) with an involvement of EM 2 lithospheric mantle and a paucity of EM 1 lithospheric mantle. The Paleocene mafic rocks of the Taihe Basin exhibit transitional geochemical features between Cretaceous and Late Cenozoic basaltic magmatism, indicating that the involvement of asthenospheric mantle beneath Southeast China increased with time from Late Mesozoic to Cenozoic. It is suggested that the lithosphere replacement beneath Southeast China was associated with lithosphere extension and thinning, with decompression melting of the upwelling asthenosphere having taken place during the Paleocene period. Lithosphere replacement might be related to subduction roll-back or/and steepening of Paleo-Pacific plate due to injection of asthenospheric material into the mantle wedge beneath Southeast China.

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Section: Secular Magma Sources For Basaltic Rocksmentioning

confidence: 99%

Section: Secular Magma Sources For Basaltic Rocksmentioning

confidence: 99%

Section: Magma Sourcementioning

confidence: 99%

Section: Petrogenesis: Crustal Contamination or Source Enrichment?mentioning

confidence: 99%

Section: Secular Magma Sources For Basaltic Rocksmentioning

confidence: 99%

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K-Ar dating, geochemical and Sr-Nd-Pb isotopic systematics of Paleocene mafic rocks in Central Jiangxi, SE China: Evidence for lithosphere replacement

Xie

Mao

et al. 2006

Geochem. J.

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Seismic evidence of the Hainan mantle plume by receiver function analysis in southern China

Wei

Chen

2016

Geophysical Research Letters

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The Lei‐Qiong region is the largest igneous province in southern China and may be a surface expression of a mantle plume beneath the region (the Hainan mantle plume). To investigate the existence of the Hainan mantle plume, we used P‐to‐S receiver function to image the major seismic discontinuities beneath this region with a regional dense broadband array. We found that the Moho discontinuity beneath the Leizhou Peninsula, mostly covered by Cenozoic basaltic outcrops, is 10–15 km deeper compared to the adjacent region of Eurasian continental margin, showing a thickened local crust by upwelling mantle materials. Additionally, the imaged 410‐ and 660‐km discontinuities suggest a thinner‐than‐normal mantle transition zone beneath the region, implying that hot materials penetrate through the transition zone from the lower mantle. Both seismic evidences support the existence of the mantle plume, which might be 170–200°C hotter than the surrounding mantle.

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High‐potassium volcanic rocks from the Okinawa Trough: Implications for a cryptic potassium‐rich and DUPAL‐like source

Zhang

Zeng

et al. 2017

Geological Journal

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Major element, trace element, and Sr–Nd–Pb isotopic compositions of high‐potassium calc‐alkaline rhyolites (the T6 rhyolites) collected from the western slope of the middle Okinawa Trough (MOT) are reported in this article. These high‐potassium rhyolites have similar major and trace elemental compositions as Type 2 rhyolites from the MOT, except that the former contain higher concentrations of K2O, Th, U, and Rb and lower concentrations of Sr and Eu. Experimental data indicate that the T6 rhyolites cannot be sourced from low‐ to mid‐potassium MOT rocks by either fractional crystallization or partial melting processes but are instead derived from a cryptic potassium‐rich source beneath the Okinawa Trough (OT). Considering that high‐potassium volcanic rocks are distributed throughout the East China Sea Shelf, the Ryukyu Arc, and Kyushu Island, the high‐potassium OT rocks could represent an important connection between the OT and its adjacent regions. Compared to volcanic rocks from the MOT axial zone, the T6 rhyolites have more depleted Sr–Nd isotopic compositions (87Sr/86Sr = 0.7035–0.7036, 143Nd/144Nd = 0.51291–0.51297) but much more enriched compositions of 207Pb (207Pb/204Pb = 15.60–15.63) and 208Pb (208Pb/204Pb = 38.45–38.57), thus recording a significant DUPAL‐like signature. These isotopic anomalies cannot be explained by the incorporation of subducting sediments or crustal contamination but instead imply the presence of a DUPAL‐like mantle source beneath the OT. The decrease of the DUPAL‐like anomaly from the T6 rhyolites to the MOT axial zone volcanic rocks is consistent with the injection of an normal mid‐ocean ridge basalt (N‐MORB) mantle source, such as asthenospheric material, into pre‐existing DUPAL‐like mantle during back‐arc extension.

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Sr, Nd, and Pb isotopic compositions of Hainan basalts (south China): Implications for a subcontinental lithosphere Dupal source

Cited by 167 publications

References 0 publications

K-Ar dating, geochemical and Sr-Nd-Pb isotopic systematics of Paleocene mafic rocks in Central Jiangxi, SE China: Evidence for lithosphere replacement

K-Ar dating, geochemical and Sr-Nd-Pb isotopic systematics of Paleocene mafic rocks in Central Jiangxi, SE China: Evidence for lithosphere replacement

Seismic evidence of the Hainan mantle plume by receiver function analysis in southern China

High‐potassium volcanic rocks from the Okinawa Trough: Implications for a cryptic potassium‐rich and DUPAL‐like source

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