The timings and geodynamic controls of Mo,Au,and Au-Mo deposits in the Xiaoqinling Orogen(>630 t Au and 115,000 t Mo),a rare Au-Mo province globally,are addressed by a combination of mineral par-ageneses,crystallin...The timings and geodynamic controls of Mo,Au,and Au-Mo deposits in the Xiaoqinling Orogen(>630 t Au and 115,000 t Mo),a rare Au-Mo province globally,are addressed by a combination of mineral par-ageneses,crystalline mineralogy,geochemistry,and Re-Os and U-Pb geochronology in the Dahu,Qinnan,and Yangzhaiyu deposits.The Xiaoqinling Orogen comprises an E-W-trending fold and thrust system with repeated structural reactivation and the Mo or Au orebodies in these deposits are dominantly controlled by E-W-trending and NW-SE-trending shear zones.Molybdenum mineralization related to K-feldspar alteration comprises early molybdenite,pyrite,rutile,and monazite within gray quartz veins plus late molybdenite and pyrite within white quartz veins in the Dahu and Qinnan Au-Mo deposits.Early and late Au mineralization events have similar mineral assemblages of pyrite,native gold±Au-Ag-Te minerals,rutile,and monazite associated with quartz-sericite alteration at Yangzhaiyu.The early dissem-inated molybdenite is characterized by rhombohedral polytype and oscillatory Re zoning,in contrast to the late molybdenite with a coexistence of rhombohedral and hexagonal polytypes and irregularly distributed Re.The early molybdenite has a Re-Os isochron age of 222.5±1.3 Ma,compatible with a monazite U-Pb age of 224±6.1 Ma,whereas late molybdenite provides a Re-Os isochron age of 185.0±12 Ma,with the implication that the 3R-polytype molybdenite with oscillatory Re zoning is more suitable for high-precision dating.The early and late Au mineralization have a pyrite Re-Os age of 202.0±5.9 Ma and U-Pb age of 124.0±1.3 Ma,respectively.In accordance with its complex geodynamic setting,geological and geochronological studies record a complicated 100-million-year mineralization history with multiple magmatic-hydrothermal Mo and orogenic Au mineralization events that formed within a structural framework of multiply reactivated shear zones.展开更多
Ionizing radiation produces excessive reactive oxygen species （ROS） which impose detrimental effects on biological systems. Thus, it is important to explore clinically safe and efficacious radioprotection agents to ...Ionizing radiation produces excessive reactive oxygen species （ROS） which impose detrimental effects on biological systems. Thus, it is important to explore clinically safe and efficacious radioprotection agents to scavenge ROS and reduce the risks of radiotherapy. Recently, emerging catalytic nanomaterials such as sulfide nanomaterials have shown capability of clearing ROS in vivo by unique electron transfers between atoms, but their catalytic activities are yet suboptimal. As such, there is an unmet need to improve cat- alytic properties for stronger antioxidant activities and radiation protection. Herein, we prepared ultra- small Au-MoS2 clusters （~2.Snm） and they showed enhanced catalytic properties via gold intercalation facilitating increased active sites and synergistic effects. Electrocatalysis results revealed that the catalytic activity of Au-MoS2 towards 1-1202 was superior to ultrasmall MoS2 without Au. As a result, we found that improving the electrocatalytic property of Au-MoS2 can effectively enhance corre- sponding antioxidant activities and radioprotection effects in vivo. In addition, Au-MoS2 also showed sig- nificant radioprotection in vitro and dramatically reduced the excess of radiation-induced adverse ROS. It also rescued radiation-induced DNA damages and protected the bone marrow hematopoietic system from ionizing radiation.展开更多
基金supported by the National Key Research and Development Project of China(2020YFA0714802)the National Natural Science Foundation of China(42330809)the 111 Project of the Ministry of Science and Technology(BP0719021).
文摘The timings and geodynamic controls of Mo,Au,and Au-Mo deposits in the Xiaoqinling Orogen(>630 t Au and 115,000 t Mo),a rare Au-Mo province globally,are addressed by a combination of mineral par-ageneses,crystalline mineralogy,geochemistry,and Re-Os and U-Pb geochronology in the Dahu,Qinnan,and Yangzhaiyu deposits.The Xiaoqinling Orogen comprises an E-W-trending fold and thrust system with repeated structural reactivation and the Mo or Au orebodies in these deposits are dominantly controlled by E-W-trending and NW-SE-trending shear zones.Molybdenum mineralization related to K-feldspar alteration comprises early molybdenite,pyrite,rutile,and monazite within gray quartz veins plus late molybdenite and pyrite within white quartz veins in the Dahu and Qinnan Au-Mo deposits.Early and late Au mineralization events have similar mineral assemblages of pyrite,native gold±Au-Ag-Te minerals,rutile,and monazite associated with quartz-sericite alteration at Yangzhaiyu.The early dissem-inated molybdenite is characterized by rhombohedral polytype and oscillatory Re zoning,in contrast to the late molybdenite with a coexistence of rhombohedral and hexagonal polytypes and irregularly distributed Re.The early molybdenite has a Re-Os isochron age of 222.5±1.3 Ma,compatible with a monazite U-Pb age of 224±6.1 Ma,whereas late molybdenite provides a Re-Os isochron age of 185.0±12 Ma,with the implication that the 3R-polytype molybdenite with oscillatory Re zoning is more suitable for high-precision dating.The early and late Au mineralization have a pyrite Re-Os age of 202.0±5.9 Ma and U-Pb age of 124.0±1.3 Ma,respectively.In accordance with its complex geodynamic setting,geological and geochronological studies record a complicated 100-million-year mineralization history with multiple magmatic-hydrothermal Mo and orogenic Au mineralization events that formed within a structural framework of multiply reactivated shear zones.
基金supported by the National Natural Science Foundation of China(81471786)the Independent Innovation Foundation of Tianjin University
文摘Ionizing radiation produces excessive reactive oxygen species （ROS） which impose detrimental effects on biological systems. Thus, it is important to explore clinically safe and efficacious radioprotection agents to scavenge ROS and reduce the risks of radiotherapy. Recently, emerging catalytic nanomaterials such as sulfide nanomaterials have shown capability of clearing ROS in vivo by unique electron transfers between atoms, but their catalytic activities are yet suboptimal. As such, there is an unmet need to improve cat- alytic properties for stronger antioxidant activities and radiation protection. Herein, we prepared ultra- small Au-MoS2 clusters （~2.Snm） and they showed enhanced catalytic properties via gold intercalation facilitating increased active sites and synergistic effects. Electrocatalysis results revealed that the catalytic activity of Au-MoS2 towards 1-1202 was superior to ultrasmall MoS2 without Au. As a result, we found that improving the electrocatalytic property of Au-MoS2 can effectively enhance corre- sponding antioxidant activities and radioprotection effects in vivo. In addition, Au-MoS2 also showed sig- nificant radioprotection in vitro and dramatically reduced the excess of radiation-induced adverse ROS. It also rescued radiation-induced DNA damages and protected the bone marrow hematopoietic system from ionizing radiation.
