Crustal and lithospheric structure of Northeast China from S-wave receiver functions

Zhang, Ruiqing; Wu, Qingju; Sun, Ling Hui; He, Jun; Gao, Zhanyong

doi:10.1016/j.epsl.2014.06.017

Cited by 89 publications

(71 citation statements)

References 52 publications

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“…Across the DTGL, the Bouguer gravity anomaly decreases rapidly from −0.1 to −0.04 cm/s 2 from west to east (Ma, ; Xu, ). Crustal elevation, morphology, and crustal and lithospheric thickness also change considerably across this lineament (Li & Mooney, ; Ma, ; Menzies, ; Tao et al, ; Ye et al, ; Zhang et al, ). The Huihe volcanic field is located to the west of the DTGL and about 500 km west of the vertical projection line of the front edge of the stagnant Pacific slab in the mantle transition zone (Figure b).…”

Section: Geological Setting and Samplesmentioning

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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Section: Geological Setting and Samplesmentioning

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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“…Deep seismic reflection imaging is effective to understand crustal and upper-mantle structures, which has been proven particularly successful all over the world (Brown, 2013) the tectonic development of southern Tibet including early 1990s Nelson et al, 1996;Zhao et al, 1993), and other tectonic setting of the continental Chin Gao et al, 2010Gao et al, , 2011Gao et al, 2013aGao et al, , 2013bGao et al, , 2013cHou et al, 2012;Lu et al, 2013;Guo et al, 2013;Lü et al, 2013;Wang et al, 2011;Wang et al, 2010Wang et al, , 2012Wang et al, , 2014Zhang et al, 2014aZhang et al, , 2014b. However, there was only one crustal study using seismic reflection methods has been performed in GXAR.…”

Section: Introductionmentioning

confidence: 98%

Fine crustal structure and deformation beneath the Great Xing’an Ranges, CAOB: Revealed by deep seismic reflection profile

Hanru

Wang

Gao

et al. 2015

Journal of Asian Earth Sciences

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“…The depth of the lithosphere–asthenosphere boundary (LAB) can be determined from the intersection of the geotherm with the mantle adiabat (Rudnick, McDonough, & O'Connell, ). Using this method, a LAB depth of ~100 km was calculated beneath the Aershan and Nuomin regions, which is significantly shallower than the lithospheric thickness (140–160 km) indicated by S‐wave receiver function analyses (Zhang et al, ). To account for this large discrepancy, we propose a model of locally upwelling hot asthenosphere, as presented by Guo et al (, ).…”

Section: Discussionmentioning

confidence: 99%

Thermal state and structure of lithospheric mantle beneath the Xing'an Massif, northeast China: Constraints from mantle xenoliths entrained by Cenozoic basalts

Guo

Wang

et al. 2018

Geological Journal

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The lithospheric mantle beneath the Xing'an Massif (XM), northeast China, was formed at the Paleoproterozoic or even earlier, but its thermal state and structure remain poorly understood. To address this issue, we calculate pressure–temperature (P–T) arrays for mantle xenoliths entrained by Cenozoic basalts from the XM, using major‐element‐based and rare earth element (REE)‐based two‐pyroxene thermometry as well as single clinopyroxene barometry. Samples (include spinel or garnet lherzolites and harzburgites, dunite and pyroxenite) come from the Keluo, Nuomin, and Aershan regions, which are located on either side of the North–South Gravity Lineament (NSGL). To the west of the NSGL, in the Nuomin and Aershan regions, mantle xenoliths yield consistent REE‐based and major‐element‐based temperatures, suggesting that these samples were derived from stable thermal conditions. Garnet peridotites from these regions yield pressures of 2.37–3.01 GPa and temperatures of 1066–1303°C, revealing a high geothermal gradient (corresponding to a surface heat flow of 70–80 mW/m2) and a crustal thicknesses of ~37 km. The lithosphere–asthenosphere boundary determined from the intersection of this geotherm with the mantle adiabat occurs at a depth of ~100 km, which is much shallower than the lithospheric thickness calculated by geophysical analyses (140–160 km). This discrepancy may have resulted from locally upwelling hot asthenosphere. Low‐temperature (800–900°C) peridotites from the Nuomin and Aershan are chemically fertile with low olivine Mg# values and high modal clinopyroxene contents. By contrast, high‐temperature (1050–1350°C) peridotites consist mainly of refractory harzburgites or clinopyroxene‐poor lherzolites. These facts reveal that the lithospheric mantle beneath the Nuomin and Aershan regions is characterized by juvenile mantle dominating shallow levels and ancient mantle occurring at greater depths. To the east of the NSGL, some Keluo mantle xenoliths yield higher REE‐based temperatures (839–863°C) than major‐element‐based temperatures (<800°C), indicating cooling by thermal relaxation. This cooling process produced a low geothermal gradient (~45 mW/m2) in the lithosphere beneath the Keluo region. The mantle xenoliths comprise both fertile lherzolites and refractory harzburgites without correlation between mineral compositions and temperatures, suggesting that the lithospheric mantle beneath the Keluo region is characterized by juvenile mantle mixed with ancient mantle at all depths. The results show contrasting thermal state and structure of the lithospheric mantle on either side of the NSGL within the XM, which are attributed to a previous cooling process in the Keluo region and local upwelling of hot asthenosphere beneath the Aershan and Nuomin regions.

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Crustal and lithospheric structure of Northeast China from S-wave receiver functions

Cited by 89 publications

References 52 publications

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

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

Fine crustal structure and deformation beneath the Great Xing’an Ranges, CAOB: Revealed by deep seismic reflection profile

Thermal state and structure of lithospheric mantle beneath the Xing'an Massif, northeast China: Constraints from mantle xenoliths entrained by Cenozoic basalts

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