Remnants of oceanic lower crust in the subcontinental lithospheric mantle: Trace element and Sr–Nd–O isotope evidence from aluminous garnet pyroxenite xenoliths from Jiaohe, Northeast China

Yu, Song-Yue; Xu, Yi–Gang; Ma, Jun; Zheng, Yong‐Fei; Kuang, Yuanyuan; Hong, Lu-Bing; Ge, Wen‐Chun; Tong, Lingling

doi:10.1016/j.epsl.2010.06.043

Cited by 84 publications

(59 citation statements)

References 46 publications

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“…With these constraints in mind, the high FeO and TiO 2 contents of the Shuangliao basalts clearly distinguish them from peridotitederived melts. A garnet pyroxenite/eclogite source also gains supporting evidence from recent findings of remnants of oceanic lower crust in the sub-continental lithospheric mantle beneath NE China, now represented by aluminous pyroxenites (Yu et al, 2010 (Chauvel et al, 1992;Willbold and Stracke, 2006). In general, the HIMU basalts are characterized by high Fe contents (Kogiso et al, 1997) and relative deficiency in very incompatible elements such as Rb, Ba, U and Th (Chauvel et al, 1992;Stracke et al, 2005).…”

Section: Source Lithology Of the Shuangliao Basaltsmentioning

confidence: 53%

“…Cenozoic volcanism in NE China is dominated by alkali basalts with subordinate tholeiites. Most contain abundant mantle xenoliths that have attracted numerous studies (Xu et al, 1993(Xu et al, , 1998(Xu et al, , 2003Zhang et al, 2000;Wu et al, 2003;Yu et al, 2009Yu et al, , 2010. Comparatively few systematic geochemical studies have been carried out on the volcanic rocks (Chen et al, 2007) with the notable exception of the potassic rocks from Wudalianchi Chen et al, 2003).…”

Section: Geologic Settingmentioning

confidence: 99%

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

et al. 2012

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Section: Source Lithology Of the Shuangliao Basaltsmentioning

confidence: 53%

Section: Geologic Settingmentioning

confidence: 99%

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

et al. 2012

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“…Yu et al [49] reported low- 18 O garnet pyroxenite xenoliths hosted in Cenozoic basalts in the northeastern NCB and considered them to represent the relicts of the subducted oceanic crust that had experienced high-T alteration or metamorphism. Zheng [24] considered that the low- 18 O peridotites and pyroxenites in the overlying mantle wedge would have formed through metasomatism by low-δ 18 O melts derived from subducting oceanic crust during slabmantle interaction in oceanic subduction channels.…”

Section: Implications For Lithospheric Evolution Beneath the Ncbmentioning

confidence: 99%

“…(3) Melting of the metasomatized mantle wedge occurred, of which the low- 18 O source (including metasomatized peridotites [16][17][18] and garnet pyroxenites [49]) was melted to produce the low- 18 O basalts, such as the Cenozoic basalts in the Sulu orogen. These low- 18 O mantle relicts, together with the overlying old lithospheric mantle-represented by high-MgO peridotite xenoliths, were brought to the surface by the host basalts [9,10,12].…”

Section: Implications For Lithospheric Evolution Beneath the Ncbmentioning

confidence: 99%

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A metasomatized mantle wedge origin for low-δ 18O olivine in late Cretaceous Junan and Qingdao basalts in the Sulu orogen

Guo

Wang

et al. 2013

Chin. Sci. Bull.

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The North China Block (NCB) experienced extensive lithospheric thinning and subsequent mantle accretion in the Mesozoic to Cenozoic, but their mechanism remains controversial. This paper reports in situ chemical and oxygen isotope analyses on olivine xenocrysts and porphyroclastic olivines in mantle xenoliths hosted in the late Cretaceous basalts from Junan and Qingdao, the Sulu orogen. The results show that all these olivines have low  18 O values relative to normal mantle peridotite. The olivine xenocrysts and porphyroclastic olivines from Junan have Fo=87.589.8,  18 O=4.1‰-5.2‰ with an average of 4.8‰; the porphyroclastic olivines from Qingdao also have Fo=89.089.9,  18 O=4.1‰-5.2‰ with an average of 4.8‰. These peridotite xenoliths have petrological and geochemical affinities similar to newly accreted MORB-type mantle, we hence consider such low- 18 O features in the olivines to inherit from a mantle wedge that was metasomatized by melts derived from the subducted oceanic crust, which had experienced high-temperature hydrothermal alteration to acquire the low- 18 O signatures. Combined the existence of Cenozoic low- 18 O basalts and garnet pyroxenite xenoliths (relicts of recycled oceanic crust) hosted in Cenozoic basalts in the NCB, the subducted oceanic crust likely played an important role in the lithospheric evolution of the NCB during the Mesozoic to Cenozoic.

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Characterization and Petrological Constraints of the Midlithospheric Discontinuity

Rader

Emry

Schmerr

et al. 2015

Geochem Geophys Geosyst

111

143

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Within continental lithosphere, widespread seismic evidence suggests a sharp discontinuous downward decrease in seismic velocity at 60–160 km depth. This midlithospheric discontinuity (MLD) may be due to anisotropy, melt, hydration, and/or mantle metasomatism. We survey global seismologic observations of the MLD, including observed depths, velocity contrasts, gradients, and locales across multiple seismic techniques. The MLD is primarily found in regions of thick continental lithosphere and is a decrease in seismic shear velocity (2–7% over 10–20 km) at 60–160 km depth, the majority of observations clustering at 80–100 km. Of xenoliths in online databases, 25% of amphibole‐bearing xenoliths, 90% of phlogopite‐bearing xenoliths, and none of carbonate‐bearing xenoliths were formed at pressures associated with these depth (2–5 GPa). We used Perple_X modeling to evaluate the elastic moduli and densities of multiple petrologies to test if the MLD is a layer of crystallized melt. The fractional addition of 5–10% phlogopite, 10–15% carbonate, or 45–100% pyroxenite produce a 2–7% velocity decrease. We postulate this layer of crystallized melt would originate at active margins of continents and crystallize in place as the lithosphere cools. The concentration of mildly incompatible elements (Y, Ho, Er, Yb, and Lu) in xenoliths near the MLD is consistent with higher degrees of melting. Thus, we postulate that the MLD is the seismological signature of a chemical interface related to the paleointersection of a volatile‐rich solidus and progressively cooling lithosphere. Furthermore, the MLD may represent a remnant chemical tracer of the lithosphere‐asthenosphere boundary (LAB) from when the lithosphere was active and young.

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Remnants of oceanic lower crust in the subcontinental lithospheric mantle: Trace element and Sr–Nd–O isotope evidence from aluminous garnet pyroxenite xenoliths from Jiaohe, Northeast China

Cited by 84 publications

References 46 publications

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

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

A metasomatized mantle wedge origin for low-δ 18O olivine in late Cretaceous Junan and Qingdao basalts in the Sulu orogen

Characterization and Petrological Constraints of the Midlithospheric Discontinuity

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