Sedimentary provenance and age of the Langshan Group in the northeastern Alxa Block: implications for Neoproterozoic tectonic evolution

The origin and the Precambrian tectonic evolution of the Alxa Block have not been well studied, largely due to widespread desert coverage and a lack of high-resolution geochronological data. This paper reports zircon U–Pb ages and Hf isotopic data for the Langshan Group in the northeastern Alxa Bloc...

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