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Regional tectonics can provide excellent transport channels and precipitation sites for mineralized hydrothermal fluid. Studying the spatial relationship and distribution trends of regional tectonics and metal mineralization has theoretical and practical significance for revealing regional mineralization regularities and guiding mineral exploration. This study considers the Nenjiang-Heihe metallogenic belt, through the fractal box dimension method and Fry analysis, to explore the spatial distribution characteristics and patterns of tectonics. The results were as follows. (1) NE and NW directions are the main tectonic directions in the study area, with high-density areas concentrated in the central-eastern and central-western regions, demonstrating an overall ring-like distribution pattern. (2) Fractal dimensions of the linear structures of the NE and NW directions and the entire study area are 1.543, 1.493, and 1.622, respectively, with a strong coupling relationship between the lineament fractal high-value area and rhombic-grid spatial distribution of known deposits. (3) Gold mineralization shows the NEE and NWW directions as two main mineralization trends; the intersection area is the gold-potential area. The main trend direction of the Cu-Mo metallogenic trend belt is the NNW direction; the intersection area with the NEE direction gold metallogenic trend belt is the Au-Cu-Mo potential mineralization area.

The metal source of gold deposits in the Jiaoxibei area, eastern China, has been investigated by many researchers, but no consensus has been reached so far. In this study, three typical gold deposits, the Xinli, Jiaojia, and Dayingezhuang deposits, were selected for trace element analysis of gold and pyrite to constrain the metal source. Pyrite from these three deposits has similar morphological and compositional characteristics, and can be divided into three types: Py1 with euhedral to subhedral textures, Py2 with subhedral to anhedral textures with micro‐fractures, and Py3 with subhedral to anhedral textures and intergrowing polymetallic sulfides. Among them, Py2 and Py3 were formed in the main ore‐forming stage and they are the dominant host minerals of visible gold. In these deposits, visible gold occurs mainly in micro‐fractures or as inclusions in Py2 and Py3. Most of the pyrite has extremely low concentration of invisible gold, indicating that visible gold in the Jiaoxibei district is not a product of the remobilization of invisible gold from earlier pyrite. Both Py2 and Py3 are characterized by low Co concentration of <100 ppm and Co/Ni ratio of <1, which are similar to those of pyrite in sedimentary rocks. Therefore, ore‐forming metals of these gold deposits in the Jiaoxibei district may originate mainly from a sediment‐related metal source.

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Current account imbalances, now manifested as intensified trade wars between countries, have recently received much attention from researchers. This article reviewed this global issue from a new perspective complementary to the existing research. The study proposed a simple economic model and discovered that the current account balance is inversely proportional to the ratio of income to consumption inequality. This ratio combines all consumption smoothing schemes that depend on political interventions that can alleviate increases in income inequality. In the long run, however, current accounts could be consequently affected by a short-sighted policy.

This study decomposes the casino hospitality business cycles of Las Vegas and Macao into highgrowth states (HGS) and low-growth states (LGS) using a Markov switching model. The casino gaming sector in Macao experiences greater fluctuations than the sector in Las Vegas due to more volatility in tourism flows; that is, Macao has a slightly higher HGS and a considerably lower LGS than Las Vegas. Las Vegas’s hospitality cycle appears to be more robust than Macao’s, although both hospitality cycles are desirably asymmetric. Various factors, including external business cycles and supply-side factors, affect local hospitality cycles. In terms of policy suggestions, the study’s results suggest that promotional marketing must be strengthened in Las Vegas, and Macao must diversify its industrial base.

Rock weathering is the main source of element geochemical cycle, which has a very important impact on the environment. Three well-developed basalt weathering profiles in Changbai Mountain area are selected in this study, and the samples of parent rock, parent material layer, sedimentary layer, and leaching layer are systematically collected. The systematic study showed that the basalt in the study area experienced moderate chemical weathering under warm and humid climate conditions, with leaching of some major elements such as silicon and aluminum. The distribution of the rare earth elements (REE) in the weathering products recalls that of an alkali-basalt, with an evident fractionation between light- and heavy-REE. Such a feature is therefore referable to the parent volcanic rock, although with some degree of leaching.

This study uses a theoretical method and also mathematical programming (MP) models to assess the polarisation of Macao’s tourism industry in terms of economic realism, with Las Vegas as a reference. The industrial polarization of Macao’s gaming industry has led to a serious imbalance in the development of the city’s industrial structure. The author posits that market structures in the two locations vary in significant ways. Due to diverse market circumstances, including tourist amenities and consumer preferences, push forces are prominent in Macao, whereas pull forces are essential in Las Vegas. As such, Macao cannot and should not endeavour to reach the same level of diversification as Las Vegas due to the possible adverse consequences of being economically non-viable because of differences in market circumstances. These theoretical implications have been validated in reality in recent years. Indeed, the emergence of up-to-date resort assets have reinforced, rather than alleviated, the specialisation of Macao’s hospitality sector. The results suggest that casino tourism in Macao will continue to expand in a polarised fashion. The purpose of this study was to determine whether Macao’s diversification, although politically mandated, is economically realistic. With the implementation of policies such as the Guangdong–Hong Kong–Macao Greater Bay Area and the Guangdong–Macao In-Depth Cooperation Zone in Hengqin, it is hoped that the study’s policy relevance will become increasingly apparent in the coming years.