Subduction-related origin of the 750 Ma Xuelongbao adakitic complex (Sichuan Province, China): Implications for the tectonic setting of the giant Neoproterozoic magmatic event in South China

Details Subduction-related origin of the 750 Ma Xuelongbao adakitic complex (Sichuan Province, China): Implications for the tectonic setting of the giant Neoproterozoic magmatic event in South China Subduction-related origin of the 750 Ma Xuelongbao adakitic complex (Sichuan Province, China): Implications for the tectonic setting of the giant Neoproterozoic magmatic event in South China

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.248..286z&link_type=abstract

Earth and Planetary Science Letters, Volume 248, Issue 1-2, p. 286-300.

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Scientific paper

The Xuelongbao plutonic complex in the eastern margin of the Tibetan Plateau is dated at 748 ± 7 Ma using the SHRIMP zircon U Pb method and represents part of the Neoproterozoic igneous assemblage of South China. Rocks in the complex include tonalite and granodiorite and have SiO2 ranging from 62.0 to 74.8 wt.% and Al2O3 from 14.3 to 20.9 wt.%. Their Na2O contents range from 4.2 to 6.7 wt.% and K2O from 0.47 to 1.96 wt.%, indicating that they belong to the Na-series. These rocks show chondrite-normalized REE patterns depleted in HREE and variably enriched in LREE. They have positive Sr and negative Nb and Ti anomalies in the primitive mantle-normalized trace elemental spider diagram. Their Sr contents range from 320 to 780 ppm and Y contents are lower than 10 ppm, resulting in high Sr/Y ratios (52 320), characteristic of typical adakites. Their ɛNd (t) and initial Sr isotopic compositions range from + 0.36 to + 2.88 and from 0.7033 to 0.7054, respectively. The geochemical features of the Xuelongbao plutonic complex are consistent with an origin from adakitic magmas that were likely derived from partial melting of a subducted oceanic slab. Together with arc signatures of other granites and mafic intrusions in the region, the 750 Ma Xuelongbao adakitic complex provides evidence for a major, subduction-related Neoproterozoic magmatic event of South China.

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