Oceanic crust components in continental basalts from Shuangliao, Northeast China: Derived from the mantle transition zone?

Xu, Yi–Gang; Zhang, Hui-Huang; Qiu, Hua‐Ning; Ge, Wen‐Chun; Wu, Fu‐Yuan

doi:10.1016/j.chemgeo.2012.01.027

Cited by 180 publications

(158 citation statements)

References 79 publications

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“…However, this study and other recent investigations (Zhang et al 2009;Zeng et al 2011;Xu et al 2012) show that this is not always the case. Instead, the involvement of pyroxenite in the source is rather common in the genesis of Cenozoic basalts.…”

Section: Implications For the Lithospheric Evolution In Eastern Nccmentioning

confidence: 38%

“…The mafic melts with the low e Nd(t) (\0) are inferred to be derived from enriched lithospheric mantle, while the melts with the high e Nd(t) ([0) are from the asthenospheric mantle (e.g., Xu 2001). The e Nd(t) values of Cenozoic basalts in Chifeng area range from ?1.6 to ?4.4 (Han et al 1999), similar to those of Cenozoic basalts in eastern NCC (e.g., Xu 2001;Zhang et al 2009;Zeng et al 2010Zeng et al , 2011Xu et al 2012), thus favoring an asthenospheric origin. More importantly, geophysical investigations have showed that the present lithosphere thickness beneath Chifeng area is *100 km (Ma 1987;Chen 2010), in agreement with the inferred melting depth of Xindian basalts (*3.0 GPa; Fig.…”

Section: Discussionmentioning

confidence: 56%

“…In view of the normal mantle potential temperature in the eastern NCC during Cenozoic, this temporal variation of basalts was explained as a result of lithospheric thickening during Cenozoic (Menzies and Xu 1998;Xu 2001Xu , 2007. However, recent studies on Cenozoic basalts from Shandong province, Subei basin and Shuangliao, eastern NCC, showed that basalts from these areas were pyroxenite melts (Chen et al 2009;Zhang et al 2009;Wang et al 2011;Zeng et al 2011;Xu et al 2012), thus casting doubt on the previous assumption of peridotite melts and assessment on variation in lithospheric thickness. Moreover, these existing studies were mainly focused on alkali basalts, but tholeiitic basalts were paid less attention, possibly due to their limited distribution in these areas.…”

Section: Introductionmentioning

confidence: 95%

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Constraints from melt inclusions and their host olivines on the petrogenesis of Oligocene-Early Miocene Xindian basalts, Chifeng area, North China Craton

Zhang

Qian

et al. 2012

Contrib Mineral Petrol

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The geochemical characteristics of melt inclusions and their host olivines provide important information on the processes that create magmas and the nature of their mantle and crustal source regions. We report chemical compositions of melt inclusions, their host olivines and bulk rocks of Xindian basalts in Chifeng area, North China Craton. Compositions of both bulk rocks and melt inclusions are tholeiitic. Based on petrographic observations and compositional variation of melt inclusions, the crystallizing sequence of Xindian basalts is as follows: olivine (at MgO [ *5.5 wt%), plagioclase (beginning at MgO = *5.5 wt%), clinopyroxene and ilmenite (at MgO \ 5.0 wt%). High Ni contents and Fe/Mn ratios, and low Ca and Mn contents in olivine phenocrysts, combining with low CaO contents of relatively high MgO melt inclusions (MgO [ 6 wt%), indicate that Xindian basalts are possibly derived from a pyroxenite source rather than a peridotite source. In the CS-MS-A diagram, all the high MgO melt inclusions (MgO [ 6.0 wt%) project in the field between garnet ? clinopyroxene ? liquid and garnet ? clinopyroxene ? orthopyroxene ? liquid near 3.0 GPa, further suggesting that residual minerals are mainly garnet and clinopyroxene, with possible presence of orthopyroxene, but without olivine. Modeling calculations using MELTS show that the water content of Xindian basalts is 0.3-0.7 wt% at MgO = 8.13 wt%. Using 20-25 % of partial melting estimated by moderately incompatible element ratios, the water content in the source of Xindian basalts is inferred to be C450 ppm, much higher than 6-85 ppm in dry lithospheric mantle. The melting depth is inferred to be *3.0 GPa, much deeper than that of tholeiitic lavas (\2.0 GPa), assuming a peridotite source with a normal mantle potential temperature. Such melting depth is virtually equal to the thickness of lithosphere beneath Chifeng area (*100 km), suggesting that Xindian basalts are derived from the asthenospheric mantle, if the lithospheric lid effect model is assumed.

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Section: Implications For the Lithospheric Evolution In Eastern Nccmentioning

confidence: 38%

Section: Discussionmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 95%

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Constraints from melt inclusions and their host olivines on the petrogenesis of Oligocene-Early Miocene Xindian basalts, Chifeng area, North China Craton

Zhang

Qian

et al. 2012

Contrib Mineral Petrol

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“…The complexity to this generalization is that magmas with OIB features are not necessarily the product of a mantle plume. For example, a basaltic seamount near the East Pacific Rise (EPR) and the Cenozoic basalt in eastern China have OIB-type features, but their origin has nothing to do with a mantle plume [45][46][47]. Therefore, an integrated approach is recommended to identify mantle plumes.…”

Section: Identification Of Mantle Plumes Using Volcanic Rocksmentioning

confidence: 99%

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

et al. 2011

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The South China Sea (SCS) is characterized by abundant seamounts, which provide important information about the evolution of the SCS and related deep processes. Cenozoic volcanism in the SCS and its surroundings comprises three stages relative to the spreading of the SCS: pre-spreading (>32 Ma), syn-spreading (32-16 Ma), and post-spreading (<16 Ma). The pre-spreading magmatism predominantly occurs on the northern margin of the SCS and in South China coastal areas and shows a bi-modal affinity. The syn-spreading magmatic activity was very limited on the periphery of the SCS, but may be concentrated in the SCS. However, seafloor samples of this stage are not available yet because of overlying thick sedimentary deposits. Post-spreading magmatism is widespread in the central and southwest sub-basins of the SCS, Hainan Island, Leizhou Peninsula, Thailand, and Vietnam. These are mainly alkali basalts with subordinate tholeiites, and display OIB-type geochemical characteristics. The Dupal isotope anomaly and presence of high-magnesian olivine phenocrysts suggests their possible derivation from the Hainan mantle plume. The temporal and spatial distribution of Cenozoic volcanism in the SCS and its surroundings may be accounted for either by plate stress re-organization before and after SCS spreading, or by ridge suction of plume flow during opening of the SCS. If the latter is the case, the volcanic rocks within the SCS basin may not be typical mid-ocean ridge basalts (MORB). It remains puzzling, however, that the transition between the South China continental margin and the SCS basin does not have features typical of a volcanic rifted margin. Clearly, the relationship between mantle plume and SCS opening needs further evaluation. A better understanding of the link between deep processes and opening of the SCS not only requires enhanced studies on igneous petrogenesis, but also is heavily dependent on systematic sampling of seafloor rocks.

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“…Many studies on this region have been done to understand the destruction of the North China Craton, the oldest tectonic unit in China (Liu et al, 1992), and Mesozoic geodynamic mechanism in eastern China (Chen, 2010;Gao et al, 2004;Liu et al, 2010;Wu et al, 2006;Xu, 2001;Xu et al, 2004;Yang et al, 2003;Zhao et al, 2013;Zhu et al, 2012). Given that the continental lithospheric mantle beneath the NCC was dramatically thinned during the Early Cretaceous till Early Tertiary (Xu, 2001;Xu et al, 2004Xu et al, , 2012, Early Cretaceous intrusion rocks, especially A-type granites, are important in revealing the geodynamic mechanism. A-type granites form in extensional environments (Loiselle and Wones, 1979;Whalen et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

The geochemical characteristics of Haiyang A-type granite complex in Shandong, eastern China

He¹,

Ling²,

Ding³

et al. 2014

Lithos

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Oceanic crust components in continental basalts from Shuangliao, Northeast China: Derived from the mantle transition zone?

Cited by 180 publications

References 79 publications

Constraints from melt inclusions and their host olivines on the petrogenesis of Oligocene-Early Miocene Xindian basalts, Chifeng area, North China Craton

Constraints from melt inclusions and their host olivines on the petrogenesis of Oligocene-Early Miocene Xindian basalts, Chifeng area, North China Craton

Opening and evolution of the South China Sea constrained by studies on volcanic rocks: Preliminary results and a research design

The geochemical characteristics of Haiyang A-type granite complex in Shandong, eastern China

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