Nature and evolution of the lithospheric mantle beneath the eastern Central Asian Orogenic Belt: Constraints from peridotite xenoliths in the central part of the Great Xing'an Range, NE China

Pan, Shaokui; Zheng, Jianping; Griffin, William L.; Xu, Yixian; Li, Xi-Yao

doi:10.1016/j.lithos.2015.09.013

Cited by 15 publications

(21 citation statements)

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“…(b) Histograms for samples from different regions showing REE‐based temperatures ( T REE ) and T P37 . The data for temperature estimates are from Fan et al (), Y. L. Zhang (), Y. L. Zhang et al (), Sui et al (), and Pan et al () [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Pyroxene major and trace element data of 37 samples are used in this study. All the major‐element data are from the literature (Pan et al, ; Y. L. Zhang, ; M. Zhang et al, ; Y. L. Zhang et al, ) and shown in Figure . The pyroxene trace element data of 21 samples are analysed in this study, while those of other 16 samples are from the literature (Table ).…”

Section: Analytical Methods and Temperature Inversionmentioning

confidence: 99%

“…These peridotites are fertile to refractory in composition with olivine Mg# of 88.2–91.2, yield varying T RD (2.64–0.34 Ga; Y. L. Zhang, ), and are protogranular or porphyroclastic in texture. Hydrous minerals are not observed in these peridotites, except for sample AS07, which contains amphibole as inclusions in olivine grains (Pan et al, ). Where observed, garnet is completely kelyphitized to aggregates of fine‐grained pyroxene and spinel (Y. L. Zhang, ).…”

Section: Geological Background and Sample Descriptionmentioning

confidence: 99%

“…Sun et al, ; M. Zhang et al, ; Zou et al, ). The composition and formation age of the SCLM have been investigated by studies of peridotite xenoliths in the Keluo, Nuomin, and Aershan regions (Fan et al, ; Pan, Zheng, Griffin, Xu, & Li, ; Sui, Fan, & Xu, ; Y. L. Zhang et al, ; M. Zhang, Suddaby, O'Reilly, Norman, & Qiu, ). These peridotites range from fertile lherzolites to depleted harzburgites (Fan et al, ; Pan et al, ; Sui et al, ; M. Zhang et al, ) and have varying 187 Os/ 188 Os values (0.1106–0.1319).…”

Section: Introductionmentioning

confidence: 99%

“…The composition and formation age of the SCLM have been investigated by studies of peridotite xenoliths in the Keluo, Nuomin, and Aershan regions (Fan et al, ; Pan, Zheng, Griffin, Xu, & Li, ; Sui, Fan, & Xu, ; Y. L. Zhang et al, ; M. Zhang, Suddaby, O'Reilly, Norman, & Qiu, ). These peridotites range from fertile lherzolites to depleted harzburgites (Fan et al, ; Pan et al, ; Sui et al, ; M. Zhang et al, ) and have varying 187 Os/ 188 Os values (0.1106–0.1319). Re–Os isotopic and mineral compositions of these xenoliths suggest that the SCLM beneath the XM had formed since at least the Paleoproterozoic but was partially replaced by juvenile mantle accreted from asthenosphere during the Phanerozoic (Y. L. Zhang et al, ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Analytical Methods and Temperature Inversionmentioning

confidence: 99%

Section: Geological Background and Sample Descriptionmentioning

confidence: 99%