Late Cenozoic magmatic transitions in the central Great Xing'an Range, Northeast China: Geochemical and isotopic constraints on petrogenesis

Ho, Kung Suan; Ge, Wen Chun; Chen, Ju Chin; You, Chen Feng; Yang, Huai Jen; Zhang, Yan Long

doi:10.1016/j.chemgeo.2013.05.040

Cited by 48 publications

(56 citation statements)

References 72 publications

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“…The negative correlation between δ 26 Mg and (Gd/Yb) N (Figure ) coupled with the hyperbolic arrays on δ 26 Mg against Sr‐Pb plots (Figure ) calls for another peridotitic component, with normal mantle‐like Mg, radiogenic Nd and Pb, and unradiogenic Sr isotopic compositions in the source region. This geochemically homogeneous component has been recognized in the mantle source of Halaha‐Chaoer sodic volcanism, and is thought to be asthenospheric mantle (Ho et al, ; Zhao & Fan, ). Therefore, the potassic and transitional rocks in Northeast China may represent a mixture of melts derived from three components: carbonated eclogites, metasomatized lithospheric peridotites, and fertile asthenospheric peridotites, in multistage processes described below.…”

Section: Discussionmentioning

confidence: 99%

Magnesium Isotopic Evidence for Ancient Subducted Oceanic Crust in LOMU‐Like Potassium‐Rich Volcanic Rocks

et al. 2017

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To evaluate the role of subducted oceanic crust in the genesis of potassium‐rich magmas, we report high‐precision Mg isotopic data for a set of Cenozoic volcanic rocks from Northeast China. These rocks overall are lighter in Mg isotopic composition than the normal mantle and display considerable Mg isotopic variations, with δ26Mg ranging from −0.61 to −0.23. The covariation of δ26Mg with TiO2 in these rocks suggests that their light Mg isotopic compositions were derived from recycled oceanic crust in the form of carbonated eclogite in the source region. The strong correlations between δ26Mg and (Gd/Yb)N ratio as well as Sr‐Pb isotopes further indicate a multicomponent and multistage origin of these rocks. Magnesium isotopes may thus be used as a novel tracer of recycled oceanic crust in the source region of mantle‐derived magmas.

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Section: Discussionmentioning

confidence: 99%

Magnesium Isotopic Evidence for Ancient Subducted Oceanic Crust in LOMU‐Like Potassium‐Rich Volcanic Rocks

et al. 2017

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“…Total alkalis versus SiO 2 diagram (after Le Bas et al, ) for the Huihe nephelinites. Data for Shandong nephelinites (gray diamonds; Zeng et al, ) and Chaihe basalts (gray circles; Ho et al, ; Li et al, ; Zhao & Fan, ; Xue et al, ) are shown for comparison.…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

“…Besides, all Huihe nephelinites also have superchondritic Zr/Hf ratios (43.5–46.6; Zr/Hf = 38 for chondrite; Anders & Grevesse, ), similar to those of the Shandong nephelinites (Zr/Hf = 44.4–50.8; Zeng et al, ). The trace‐element concentrations of the Chaihe basalts are lower than those of the Huihe and Shandong nephelinites, and their patterns show less pronounced Zr, Hf, and Ti anomalies (Hf/Hf* = 0.74–0.85, Ti/Ti* = 0.87–1.56; Ho et al, ; Li et al, ).…”

Section: Whole‐rock Compositions Of the Huihe Nephelinitesmentioning

confidence: 99%

Light Mg Isotopic Composition in the Mantle Beyond the Big Mantle Wedge Beneath eastern Asia

Chen

Shi

et al. 2019

JGR Solid Earth

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Low‐δ26Mg basalts are commonly interpreted to represent melts derived from carbonated mantle sources. The mantle domain feeding low‐δ26Mg Cenozoic basalts in eastern China overlaps the so‐called Big Mantle Wedge (BMW) above the stagnant Pacific slab in the mantle transition zone, which indicates that the BMW is an important carbon reservoir generated by the slab. However, Mg isotopic composition in the nearby mantle beyond the BMW and, thus, the spatial extent of carbonated components in the mantle beneath eastern Asia have not yet been extensively characterized. Therefore, it remains largely unconstrained if additional or alternative carbon reservoirs exist. Here we carried out a geochemical study on Cenozoic Huihe nephelinites, which crop out ~500 km west of the present‐day BMW. These rocks are characterized by negative K, Zr, Hf, and Ti anomalies, high Zr/Hf, Ca/Al ratios, and low δ26Mg values, which suggest that they are derived from a carbonated mantle source. The composition of the nephelinites demonstrates that low δ26Mg mantle components exist at significant distances from the present‐day BMW, which highlights that in addition to the stagnant Pacific slab, other oceanic slab(s) also contribute(s) carbonate‐bearing crustal materials to the mantle sources of Cenozoic volcanism in eastern Asia.

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“…They are mainly exposed along the flanks of the Songliao basin with the Greater Khingan Range in the west, the Lesser Khingan Range in the north, and the Changbaishan mountains in the east [ Liu et al ., ]. Based on their K 2 O content, the basalts can be subdivided into ultrapotassic series (K 2 O > 3 wt % and K 2 O/Na 2 O > 2), potassic series (K 2 O > 3 wt % and 1 < K 2 O/Na 2 O < 2), and sodic series volcanic rocks [ Zhang et al ., ; Ho et al ., ; Sun et al ., ]. Geochemical studies have inferred EM1‐like mantle sources for these ultrapotassic (Xiaogulihe [ Sun et al ., , ]) and potassic rocks (Wudalianchi‐Erkeshan‐Keluo [ Zhang et al ., , ; Zou et al ., ; Choi et al ., ; Kuritani et al ., ; Chu et al ., ]; Nuominhe [ Zhao et al ., ]).…”

Section: Introductionmentioning

confidence: 99%

The role of melt‐rock interaction in the formation of Quaternary high‐MgO potassic basalt from the Greater Khingan Range, northeast China

et al. 2017

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Melt‐rock interaction between ascending melt and peridotite results in mantle metasomatism and also leads to compositional modification of the primary melt. While this process is known to occur, it is less well understood how the reactions and the composition of the resulting magma temporally evolve. Here whole‐rock major and trace element, Sr‐Nd‐Pb‐Hf isotopes, and olivine major element composition of Quaternary Nuominhe basalts in the Greater Khingan Range of northeast China are presented to unravel how melt‐rock interaction modified the composition of the high‐MgO potassic basalts as time progressed. The Nuominhe basalts are predominantly basanite with high MgO (8.1–16.8 wt %) and high total alkali content (K2O + Na2O = 6.0–9.2 wt %). They have high K2O/Na2O ratios (K2O/Na2O = 0.77–1.24) and low SiO2 and Al2O3 content (SiO2 = 44.4–48.7 wt %, Al2O3 = 10.5–13.2 wt %). They are characterized by enrichment in strongly incompatible elements, positive Ba, K, and Sr and negative Th, U, Zr, Hf, and Ti anomalies, similar to the composition of enriched mantle (EM1)‐type oceanic island basalts (OIBs). Their isotopic composition also compares to that of EM1‐type OIBs (i.e., with 87Sr/86Sr = 0.70467–0.70483, εNd = −4.1 to −1.5, εHf = −0.3 to 2.3, 206Pb/204Pb = 17.03–17.36). These elemental and isotopic characteristics are consistent with the interpretation that the potassium‐rich melts were derived from recycled crustal materials with EM1 signature. Phlogopite‐bearing mantle xenoliths and zoned olivine xenocrysts with high Fo89–92 and low CaO (<0.1 wt %) core and low Fo75–86 and high CaO (>0.1 wt %) rim composition record interaction between the ascending melt and mantle peridotite. Basalts erupted during late stages (Late Pleistocene and Holocene) of activity at the Nuominhe volcanic field show notably higher SiO2 content, Rb/Nb, Ba/Nb, K/La, and Ba/La, and lower MgO content than early‐stage basalts (Early and Middle Pleistocene), which we infer to reflect a temporally decreasing extent of melt‐rock interaction. During early stages of melt ascent, a reaction zone between melt channels and unreacted peridotite formed; at later stages this reaction zone effectively sealed the ascending melt from further reaction, resulting in increasing Rb/Nb, Ba/Nb, K/La, and Ba/La signatures of the erupted lavas.

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Late Cenozoic magmatic transitions in the central Great Xing'an Range, Northeast China: Geochemical and isotopic constraints on petrogenesis

Cited by 48 publications

References 72 publications

Magnesium Isotopic Evidence for Ancient Subducted Oceanic Crust in LOMU‐Like Potassium‐Rich Volcanic Rocks

Magnesium Isotopic Evidence for Ancient Subducted Oceanic Crust in LOMU‐Like Potassium‐Rich Volcanic Rocks

Light Mg Isotopic Composition in the Mantle Beyond the Big Mantle Wedge Beneath eastern Asia

The role of melt‐rock interaction in the formation of Quaternary high‐MgO potassic basalt from the Greater Khingan Range, northeast China

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