The Research Advances of (U-Th)/He Dating and Influencing Factors
(U-Th)/He isotopic dating with its low-temperature sensitivity (70 ℃),provides an accurate time-temperature evolution model for the construction of temporal-spatial framework of uplift and denudation rates in orogenic belts,temporal constraints on hydrocarbon formation,recovery of burial history in sedimentary basins,the study of denudation and preservation of mineral deposits,and reconstruction of paleotopography and geomorphology,with promising applications. Understanding mineral closure temperatures,internal structure,4He diffusion mechanisms,and uranium-thorium zoning effects are keys to interpreting (U-Th)/He data. A detailed discussion of (U-Th)/He technical studies is presented,including the appropriate target minerals and different geological applications for dating,the development of test methods and standard references,a focus on the factors that contribute to age bias,and a brief description of the radiation damage mechanisms for the major minerals. Research has shown that China's (U-Th)/He dating technology has advanced significantly,progressing from the non-dilution method to the single-particle laser fusion technique,and subsequently to the in-situ micro-area dual dating method using the RESOlution excimer laser ablation system. Measurement results from FCT zircon,Durango apatite,and Penglai zircon align closely with international calibration ages,falling within the expected margin of error. Moreover,an MK-1 apatite standard sample has been developed independently,indicating the maturity of the technology. Most of the uranium-thorium bearing minerals that have effectively preserved 4He can be suitable objects for dating. A summary of strategies to effectively avoid the effects of mineral inclusions,mineral grain size,α-particle ejection and implantation effects,and compositional ring-banding can help Chinese scholars interpret (U-Th)/He data.
NETL
NSTL
万方数据
