The Weizigou Au deposit in Heilongjiang Province, NE China, located in the southern Jiamusi Massif, shows similarities to IOCG deposits. To determine the mineralization age, sources of ore-forming materials and genetic type, pyrite Re-Os dating, S-Pb isotopic analysis, in situ sulfur analysis and LA-ICP-MS analysis of trace elements in magnetite, pyrite and pyrrhotite were conducted. Four pyrite samples yielded a Re-Os isochron age of 197 ± 11 Ma, implying the occurrence a metallogenic event in the Early Jurassic. The δ³⁴S values of sulfides display a relatively narrow range from 4.70‰ to 12.83‰ (mainly 9.90‰ to 12.83‰), which may be accounted for the extensively exposed granitic gneiss and meta-gabbro, with δ³⁴S values of 7.44‰ to 8.44‰ and 4.37‰ to 10.54‰, respectively. Sulfide lead isotopic compositions have ²⁰⁶Pb/²⁰⁴Pb = 18.605–20.136, ²⁰⁷Pb/²⁰⁴Pb = 15.637–15.710 and ²⁰⁸Pb/²⁰⁴Pb = 38.534–39.129, indicating that the lead was derived from a mixed source. Magnetite has the characteristics of a lower Ti content and higher Zn content, indicating that it should be of hydrothermal origin, which may be related to IOCG-type mineralization. Pyrite and pyrrhotite have a Co/Ni ratio greater than 1 and a lower As content, indicating that they are of magmatic hydrothermal origin. Integrating the above analysis results, we inferred that the Weizigou Au deposit experienced the IOCG-type mineralization in the Middle-Late Permian, associated with magmatic-hydrothermal mineralization in the Early Jurassic.

滇西保山地块是东特提斯构造域的主要微陆块之一，但对其物源和古地理位置仍存在较大争议。本文通过对保山地块西缘早古生代地层进行碎屑锆石U-Pb定年来约束其物源及古地理位置，并进一步探讨原特提斯洋早古生代构造演化模式。保山地块西缘早古生代地层具有相似的年龄分布模式，主年龄峰期为~0.95Ga、次级年龄峰期为~1.2Ga和~2.5Ga。寒武系公养河群最小锆石年龄为526Ma，结合其上部年龄为499.2Ma的火山岩夹层，约束其沉积时代为早寒武世早期。对比保山地块不同区域早古生代地层的碎屑锆石年龄数据，它们都具有相似的锆石年龄分布模式和年龄峰值。~0.95Ga主年龄峰期和~2.5Ga的次级年龄峰期指示保山地块早古生代的沉积物主要来自于印度大陆，而~1.2Ga的次级年龄峰期表明有部分沉积物来自于西澳大利亚，其早古生代古地理位置位于印度和西澳大利亚之间。结合沉积学证据及滇西地区广泛发育的早古生代岩浆作用，本文认为早古生代冈瓦纳大陆北缘为活动大陆边缘。

The large-scale access of distributed generation (DG) makes microgrids gradually become a key part of smart grids. Geographically adjacent microgrids in the region are connected to each other to form a regional multi-microgrid (MMG) system. However, how to achieve the communication between the sub-microgrids and the energy management within the system becomes very important. Therefore, this paper focuses on the optimal dispatch problem in the operation of regional multi-microgrid. Firstly, the typical structure and internal composition of regional multi-microgrid system are introduced. Secondly, combined with the relevant theory of topology identification, a dynamic networking strategy of regional multi-microgrid based on graph theory is designed. Finally, based on the dynamic networking strategy of regional multi-microgrid, a dynamic networking strategy of regional multi-microgrid considering economy and active loss is proposed. In the operation process of regional multi-microgrid, the price-based demand response (PBDR) strategy is introduced to optimize the operation process of regional multi-microgrid with the goal of optimal economic operation and lowest total active power loss, and the results after solution are analyzed by TOPSIS method. The simulation results show that through dynamic networking, the system operating cost of the regional multi-microgrid is reduced by about 39.4% and the active power loss is reduced by about 10.6% under normal operation, which reduces the active power loss of the system while ensuring economic operation, which verifies the effectiveness and feasibility of the model.