1.ProgramPetrology
MembersYuanbao Wu
Abstract
In the recent five years, the applicant has published 24 SCI papers as the first or corresponding author, and all the first or corresponding author's papers have been cited 1017 times by other SCI papers. The achievements include: (1) Expanding the research about zircon genesis, and finding that zircon Lu-Hf isotope composition can provide an useful method to constrain the formation conditions and genesis of zircon; (2) Providing precise constraints on the timings of the subduction, two-stage exhumation, switch of tectonic regime, and the collapse of the Dabie orogenic belt; (3) Prescribing the generation and migration of fluid and melt in subducting slabs; (4) Making certain the distributions and timings of the two episodes of HP-UHP metamorphism of the western Dabie orogen, confirming the presence of the Paleotethys in the western Dabie orogen, providing a clear genetic link among granulite-facies metamorphism, magmatism, and crustal growth in an accretionary orogen, and proposing the multi-stage evolution of the Qinling-Dabie orogen; (5) Ascertaining the characteristics and the precise timings of the Paleoproterozoic metamorphism, finding the oldest rock of ca. 3.2 Ga up to now, and the ca. 2.5 Ga TTGs and 2.1 Ga calc-alkaline granitoid in the Yangtze Block; and demonstrating the presence of two microcontinents in the western and eastern parts of the Yangtze Block in the early Paleoproterozoic and their final amalgamation resulting in the paleoproterozoic arc-continental collision.
2.ProgramGeochemistry
MembersZhaochu Hu
Abstract
The applicant has been committed to developing trace element and isotope ratio analytical method by using laser ablation ICP-MS/MC-ICP-MS and studying the crustal abundances of trace elements. He provided new abundances of thirty-one trace elements and platinum group elements in the upper continental crust. He developed in situ B、S、Nd and Hf isotope ratio analytical method using newly designed cones in combination with the addition of nitrogen. He designed a signal smoothing device and a mercury removing device for laser ablation analysis. He established a green and laser fusion technique for bulk silicate rock analysis. He developed an efficient and simplified open-vessel digestion technique using ammonium bifluoride/ammonium fluoride for multi-element analysis of different types of rock samples such as felsic rocks. He was selected as a Fellow of the Royal Society of Chemistry in 2015. He published 20 articles in SCI journals as first or corresponding author for recent five years. The total citations of his first or corresponding author’s articles are 641 by other peoples for recent five years. As non-first or corresponding author, he published 90 articles in SCI journals for recent five years. The total citations of his non-first or corresponding author’s articles are 2876 by other peoples for recent five years. In this project, he will focus on the determination of isotope ratios and trace elements in geological samples by using femto-second laser ablation system.
3.ProgramGeobiology
MembersChao Li
Abstract
My research mainly focuses on the coevolution of early oceanic environments and life (>510 Ma). Some results have been reached in past years in paleoceanic spatial redox structure, the coevolution of paleoceanic redox conditions and early animals, and biogeochemical cycles of key life elements: (1) I proposed a stratified ocean redox model characterized by a mid-depth euxinic wedge for the Ediacaran oceans, and further developed a more detailed multiple-layer chemical zonation model for early oceans, and proposed an oxidant-availability control mechanisms for the redox stratification in early oceans; I also provided evidence for occurrences of the mid-depth euxinic wedge structure in early oceans in multiple key geological periods. All of these findings points to the main features of spatial heterogeneity and dynamic evolution for the early ocean chemistry. (2) I found highly spatial marine redox heterogeneity, phased expansion of shelf surface oxic waters as well as coupled the spatial colonization and evolution of early animals in the late Neoproterozoic and early Cambrian; thus I proposed a hypothesis that the early radiation of complex eukaryotic life may have been triggered by phased shelf oxygenation rather than global deep ocean oxygenation. (3) I proposed C-cycling and Mo-cycling models for early oceans characterized by highly stratified redox structure, which demonstrates the unique spatial characteristics and substantial difference from those of modern oceans. In past 5 years, I have published 30 SCI articles, including 20 articles with the applicant as the first and/or corresponding author in high profile journals such as Geology (2), EPSL (1) and GCA (3). My papers have been cited for 958 times in total and for 701 times by other researchers in SCI journals in past 5 years.
