Zhang Shuo, Jian Xing, Zhang Wei
Advances in Earth Science.
Online available: 2018-11-07
In situ analysis of detrital apatite is a significant approach to sedimentary provenance analysis, which is an important aspect in sedimentary geology study. Several trace elements such as Sr, Y and rare earth elements (REEs) concentrate in apatites, and the distribution of these elements is depended on the content of SiO2 and the distribution coefficient of the melt, thus the trace element abundances is obviously different in different rocks. These features can be used to indicate parent-rocks of detrital apatites in sedimentary rocks. The approaches and proxies of detrital apatite to sedimentary provenance analysis can be summarized as follows. ①elemental geochemistry, such as Sr, Y, REEs, the approaches include chondrite-normalised REE distribution patterns of apatites, classification and regression tree (CART) and discriminant plots of REEparameters ; ②isotopic geochemistry, including Sr-Nd and Lu-Hf isotopes; ③Multi-dating , including low-temperature t thermochronology such as (U-Th)/He (AHe)and fission track (AFT) dating, and high-temperature thermochronology such as U-Pb dating. Based on an integrated analysis using these methods, we can get various and comprehensive geological information such as the rock type, formation conditions and evolution of source rocks, the history of uplift and exhumation of source areas and even the subsidence history of sedimentary basins. Although the low-temperature thermochronology of detrital apatite is widely used in sedimentary provenance analysis, the elemental and isotopic geochemistry, as well as the U-Pb dating, remain to be developed and. These approaches are supposed to have wide application prospects in several research areas such as tectonics, sedimentary geology basin analysis and even paleoclimatology.