The Xinchang peridotite xenoliths reveal mantle replacement and accretion in southeastern China

Recycling of oceanic crust from a stagnant slab in the mantle transition zone: Evidence from Cenozoic continental basalts in Zhejiang Province, SE China

“…This is consistent with the geophysical data, which reveal a thin lithosphere of 80 km beneath the coastal areas of South China (An and Shi, 2006). The maximum temperature estimate for the Xinchang mantle xenoliths is 1215°C Liu et al, 2012b), which is very close to the temperature at the base of the SCLM (~1220°C). The geotherm beneath the Xinchang area (Fig.…”

“…The area has a high heat flow of 70-80 mW/m 2 , which might reflect lithospheric extension and thinning, probably related to the opening of the South China Sea (Ho et al, 2003;Xu et al, 1995). The presence of garnet-bearing lherzolite xenoliths in Xinchang indicates that the Cenozoic lithosphere there has a thickness of~80-90 km (Liu et al, 2012b). This is consistent with the geophysical data, which reveal a thin lithosphere of 80 km beneath the coastal areas of South China (An and Shi, 2006).…”

“…The measured isotopic ratios of samples were corrected with a value of 0.11% per atomic mass unit. Three analyses on NISTSRM981 during ; (b) Cenozoic basalts and sample locations in Zhejiang Province, modified after Liu et al (2012b), and the whole-rock Ar-Ar age data come from Ho et al (2003); (c) East-west vertical cross section of P-wave velocity tomography along 29°N, indicating high and low-velocity zones beneath Zhejiang Province. The figure is slightly modified from Huang and Zhao (2006 Bulk-rock Re-Os isotopes were analyzed at the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS), following the analytical procedures described by (Li et al, 2010).…”

“…1b). It has been suggested that the Cenozoic basalts in Zhejiang Province generally become more alkaline in character from the coastal areas to the interior (Ho et al, 2003;Liu et al, 2012b). Most of the Cenozoic alkaline basalts in SE China contain abundant mantle xenoliths.…”

Formation and evolution of Precambrian continental lithosphere in South China

“…The Re-Os isotope data from peridotite xenoliths at Xinchang in the Cathaysia terrane give T RD ages of 0.99-1.35 Ga for harzburgite and younger T RD age of 0.22-0.75 Ga for lhzerlite (C.Z. Liu et al, 2012b), suggesting that not only the existence of Precambrian SCLM relict but also its reworking in the Phanerozoic. Xu et al (2008) carried out laser in-situ Re-Os isotope analyses on sulfides in mantle-derived xenoliths from Yangtze and Cathaysia.…”