SHRIMP zircon U-Pb age constraints on Neoproterozoic Quruqtagh diamictites in NW China

Abstract

The Neoproterozoic Quruqtagh Group in the Tarim Block, NW China, contains multiple diamictites in the Bayisi, Altungol, Tereeken, and Hankalchough formations. These diamictites may represent three or possibly four discrete glaciations, although evidence for a glacial origin of the Bayisi and Altungol diamictite is ambiguous. To constrain their age and duration, we dated three volcanic beds (V1, V2, and V3) in the Quruqtagh Group using the SHRIMP (sensitive high-resolution ion microprobe) zircon U?Pb method. Volcanic bed V1 near the base of the Bayisi diamictite yields a 7407Ma age, volcanic bed V2 near the top of the Bayisi Formation gives a 72510Ma age, and volcanic bed V3 between the Tereeken and Hankalchough diamictites yields a 6156Ma age. V1 and V2 have overlapping ages, and together these dates suggest that the Bayisi diamictite was deposited at around 730 Ma. The Tereeken and Altungol diamictites were deposited between 72510Ma and 6156 Ma, and the Hankalchough diamictite between 6156Ma and ~542Ma (i.e., the Neoproterozoic?Cambrian transition). These dates and previously published chemostratigraphic data are consistent with (but do not require) the correlation of the Tereeken and Hankalchough diamictites with the 635Ma Nantuo and 582Ma Gaskiers glaciations, respectively. However, the new dates are inconsistent with a single and globally synchronous Sturtian glaciation that occurred in the pre-Nantuo Neoproterozoic Era. Instead, currently available data necessitate that either multiple glaciations occurred, or a globally diachronous glacial event developed during a protracted period between ~750Ma and ~650 Ma.