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2021 Vol. 8, No. 3
Published: 2021-06-20
 
1 Analysis of global climate change in the next one hundred years
LIU Yan
DOI: 10.19388/j.zgdzdc.2021.03.01
The consequences of global climate change in the next one hundred years is a hotly-debated topic at present, and the deep discussion of the driving mechanism for global climate change can truly help recognize the global climate change. The continuous growth of Tibetan Plateau has absorbed a huge amount of atmospheric CO2, which leads to the sharp drop of the atmospheric CO2 concentration. From the greenhouse climate, the Earth has entered into an icehouse climate characterized by the cycling of glacial and interglacial periods, and has become a new carbon reservoir. During the interglacial period, the Tibetan Plateau and the Mongolian Plateau transported a huge amount of fresh water to the inland areas at middle and low latitudes (referred as the inland area below), which resulted in the strong chemical weathering of silicate rocks. The vegetation and lacustrine deposition were developed, which absorbed huge amount of atmospheric CO2, as a carbon sink. During the glacial period, the Tibetan Plateau and the Mongolian Plateau eventually transported a large amount of surface fresh water and dust from the inland areas to the high latitude areas, resulting in the occurrence of desertification in the inland areas. The absorbed CO2 was far less than the emitted amount, and the inland areas became the carbon source area. Therefore, the atmospheric CO2 concentration increased. This mechanism has maintained the low concentration and pseudo dynamic equilibrium of atmospheric CO2 since the Miocene. The mean surface temperature drove the circulation of fresh water between high and low latitudes. The huge amount of anthropogenic carbon emission caused the rapid rise of atmospheric CO2 concentration and global warming. Therefore, the fresh water returned to the inland area, resulting in the rapid green in inland areas and more intense chemical weathering of silicate. The ability to absorb atmospheric CO2 was dramatically enhanced, and the inland areas were switched from the carbon source area to the carbon sink area, which prevented the further rise of atmospheric CO2 concentration. According to the preliminary calculation in this study, when atmospheric CO2 concentration reaches (510±40)×10-6, the rapid increasing trend will be restrained, as early as 2050 and as late as 2090. Future century-scale climate change is therefore predictable and periodic, driven by tectonic activities within the Earth and Sun.
2021 Vol. 8 (3): 1-11 [Abstract] ( 184 ) RICH HTML PDF (2974 KB)  ( 169 )
12 Application of IP method in the evaluation of the target area of Shanlixu skarn type copper-gold deposit in Chaohu City
CHEN Zhidong, WANG Zihao, LIU Sheng
DOI: 10.19388/j.zgdzdc.2021.03.02
In order to achieve a new prospecting breakthrough in west of Shanlixu area, the authors have conducted the dual frequency IP scanning and high-power IP sounding profile work. The distribution of two structures was inferred through the study of the characteristics of IP anomalies. The IP conductivity anomalies were well reflected in the known copper mineralization position in the study area after the extraction of the secondary information of IP, and two metallogenic targets in the west of the study area were delineated according to this anomaly characteristics combined with the IP anomaly characteristics. These results show that the ore-induced anomalies in the study area could be effectively evaluated by the comprehensive analysis of IP multi-parameters and known ore bodies, which could provide the geophysical basis for the next drilling engineering verification and help geologists find copper-gold polymetallic ores in the periphery of similar mining areas.
2021 Vol. 8 (3): 12-20 [Abstract] ( 119 ) RICH HTML PDF (6073 KB)  ( 180 )
21 Application of comprehensive geophysical prospecting method in uplift geothermal field
ZHAO Jichu, GUO Guoqiang, WU Qinghua
DOI: 10.19388/j.zgdzdc.2021.03.03
In this paper, the authors have taken Xiangshanwan geothermal field in Xiamen as an example to detect the fault related geothermal water enrichment areas and determine the optimum borehole position based the Geophysical anomaly, combined with the comprehensive geophysical prospecting method of Controlled Source Audio-frequency Magneto Tellurics (CSAMT), joint resistivity profiling and resistivity sounding. The results show that the CSAMT method is efficient and reliable to prospect the spatial distribution characteristics of fault structures in the study area, and it can be used to determine the possible areas of geothermal reservoir. The joint resistivity profiling and resistivity sounding are arranged vertically along the strike of the inferred fault structures to verify the fault structures inferred by the CSAMT method, which would further determine the occurrence of the fault structures in the geothermal water enrichment section and eliminate the multiple interpretational nature of geophysical prospecting method. Finally, the cross region formed by the hanging wall of multiple groups of fault structures is selected as the best borehole target area for geothermal geological drilling. The drilling results show that the single well yield is about 41.76 m3/h, and water temperature is of 52 ℃, with the total soluble solid of 6 183.19 mg/L and the water type of Cl-Na in Xiangshanwan geothermal field.
2021 Vol. 8 (3): 21-29 [Abstract] ( 148 ) RICH HTML PDF (7397 KB)  ( 105 )
30 The control effect of magmatic rocks and structures on the gold deposits in Wuhe area of Anhui Province
ZHANG Jiajia, GU Danian, DU Dongxu
DOI: 10.19388/j.zgdzdc.2021.03.04
In order to invstigate the relationship between gold deposits and magmatic rocks or structures, the authors in this paper have analyzed the spatial relationship between magmatic rocks and gold deposits, the isotope characteristics of ore-forming fluids and the control effect of Tan-Lu fault zone on the gold deposits, after analyzing the gravity and magnetic anomalies to infer the distribution characteristics of hidden rock masses. The results show that most of the gold deposits are located on the edge of the known or hidden rock bodies and the deposits in the area have similar ore-forming fluids. Most of the quartz sample points fall into the magma water range in the H-O isotope diagram, and other points fall into the range of metamorphic water. The magmatic rocks provide an important material source for the formation of gold deposits and the intrusion of magma causes the activation of metamorphic rock series. The mixed fluid provides heat source for the migration and enrichment of the gold element, and activates the gold element during the formation of gold deposits. The ore-forming fluids migrate, enrich, and mineralize along the NNE-NE secondary faults of the main fault.
2021 Vol. 8 (3): 30-39 [Abstract] ( 176 ) RICH HTML PDF (13654 KB)  ( 109 )
40 Soil geochemical characteristics and the prospecting effect of Dalong area in Ningguo City of Anhui Province
XIE Xi, LI Bin, DU Yudiao
DOI: 10.19388/j.zgdzdc.2021.03.05
Dalong area is located at the junction of Anhui and Zhejiang Province, with poor terrain condition. Systematic geological survey has never been carried out in this area and significant progress has not been achieved in the prospecting work. Through the 1:10 000 soil geochemical soil survey in the study area, the authors in this paper have adopted the theories and methods of the coefficient of variation, enrichment coefficient and enrichment discrete characteristics to analyze geochemistry statistics of twelve kinds of trace elements, and the results show that five elements of Ag, W, Mo, Bi and Zn have great metallogenic potential. Twelve kinds of trace elements have been analyzed with correlation and R-factor analysis and three sets of main mineralization element combinations were classified, which were Pb-Zn, W-Bi and Mo-Ag-Cu-As-Sb-Hg. A hundred and fifty-eight single element anomalies and eighteen comprehensive anomalies were identified in the study area. Besides, Six comprehensive anomaly zones were identified. Five integrated anomaly zones with good metallogenic conditions were tested through trenching and drilling methods to define 15 tungsten, molybdenum and lead zinc-ore bodies, which indicated good prospecting result.
2021 Vol. 8 (3): 40-48 [Abstract] ( 107 ) RICH HTML PDF (4544 KB)  ( 95 )
49 Dynamic monitoring of the groundwater in Guangrao County in Shandong Province and the analysis of its geological environmental effect
LIU Shuai, LIU Zhitao, DUAN Xiaofei, FENG Ying, JIANG Shujie, HUANG Song
DOI: 10.19388/j.zgdzdc.2021.03.06
Guangrao County is rich in underground water resources, which is an important source of industrial and agricultural water for production and domestic use. And there are some geological environmental problems such as groundwater depression funnel, saltwater intrusion and land subsidence, due to the long-term large-scale exploitation of groundwater. Through the collection and analysis of the multi-year monitoring data of groundwater level, the authors in this paper have revealed the evolution law of groundwater level and predicted the change trend. The results show that the shallow groundwater depression funnel has been basically stable without aggravating trend under current mining conditions. Considering the developing trend of the land subsidence and saltwater intrusion, the authors have concluded that the restricted depth of deep groundwater is no more than 80 m, and the restricted depth of saltwater intrusion in Shimiao area is 10 m, which has provided the technical basis for the rational exploitation of local groundwater and the prevention of geological environmental problems.
2021 Vol. 8 (3): 49-57 [Abstract] ( 127 ) RICH HTML PDF (6842 KB)  ( 158 )
58 Remote sensing monitoring for the oil and gas platform in the South China Sea
WANG Yi, LI Li
DOI: 10.19388/j.zgdzdc.2021.03.07
There are rich oil and gas resources in the South China Sea (SCS). In recent years, the striving for oil and gas resources in the SCS is increasingly intensive amang the surrounding countries and the contradiction of the ownership of territory and oil and gas resources has also become increasingly apparent. Therefore, it is of great significantce to protecting China’s marine rights, resources and environment by monitoring the distribution and changes of the offshore oil and gas platform in time. In order to optlmize the detection of oil and gas platform, the authors have summarized and analyzed the research of remote sensing monitoring on the oil and gas platform in the SCS from two aspects—the selection of the data source and the recognition method for remote sensing images. According to the current requirements of the oil and gas platform monitoring in the SCS, the authors have also analyzed the related problems and challenges, and put forward some suggestions for the future research.
2021 Vol. 8 (3): 58-63 [Abstract] ( 155 ) RICH HTML PDF (640 KB)  ( 138 )
64 Dynamic changes of vegetation coverage in Heihe River Basin from 1990 to 2019 and the effect of temperature on it
WANG Peng, WANG Yanhe, HAN Xiaolong, HAN Hao, ZHANG Deming, ZHANG Bingqiang
DOI: 10.19388/j.zgdzdc.2021.03.08
The change features of vegetation coverage are important for the river ecological detection, and can provide basic information for the comprehensive river management. Heihe River Basin is the second largest inland river basin in the arid-semi-arid regions of Northwest China. In order to investigate the ecological status of the arid-semi-arid regions of Northwest China, the authors have taken Heihe River Basin as the study area and comprehensively applied the pixel binary model and unary linear regression to analyze the dynamic changes of vegetation coverage in Heihe River Basin from 1990 to 2019 and discussed the effect of temperature according to the Landsat NDVI data from 1990 to 2019. The results show that the vegetation coverage of Heihe River Basin decreases from south to north. In the past 30 years, the vegetation coverage area has shown an overall upward trend, and the increasing rate of medium-high vegetation coverage area is the fastest. The vegetation coverage in most parts of the basin remains unchanged and the area with increasing vegetation coverage are larger than those with decreasing vegetation coverage. Due to the effect of global warming, the temperature of the entire basin is increasing. The temperature has the fastest increase in the upstream and the slowest increase in the downstream. The temperature increase in the upstream and downstream promotes vegetation coverage, while the temperature increases in downstream restrains the vegetation growth.
2021 Vol. 8 (3): 64-71 [Abstract] ( 150 ) RICH HTML PDF (3617 KB)  ( 120 )
72 Impact of land use change on ecosystem service value in Changsha City from 1990 to 2018
PENG Yi, WANG Yuanchao, GAO Yang
DOI: 10.19388/j.zgdzdc.2021.03.09
The evaluation of ecosystem service value is conducive to measuring the supply potential of ecosystem service and the ecological benefit, which can provide important references for city ecological planning and land use management. Based on the remote sensing data of 1990, 2000, 2010 and 2018, the authors in this paper have taken Changsha as a study case to analyze the land use change from 1990 to 2018 and discussed the impact of land use change on ecosystem service value, by ArcGIS and equivalent factor methods with localization correction. The results are as follcws. ① The land use trajectories in Changsha are mainly the conversion of cultivated land and woodland, and the encroachment of cultivated land and woodland by construction land from 1990 to 2018. ② The ecosystem service value in Changsha decreased by 5.317 billion yuan, with the decreasing rate of 3.59% from 1990 to 2018. Except the water area, the value of all the ecosystem service showed a downward trend, especially in the cultivated land and woodland. ③ Hydrological regulation and climate regulation were the top two service functions with high service value, contributing about 54% of the total service value. ④ A series of policies such as Returning Farmland to Forest, Returning Farmland to Lakes and Strengthening Industry to Strengthen City have brought a remarkable impact on ESV, and the urban expansion and land development would lead to declining ESV. It is necessary to pay more attention to the land use types with higher ecosystem service value such as water area and woodland. Adjusting the land use structure and optimizing land allocation in the study area can mitigate the downtrend of ESV in these areas.
2021 Vol. 8 (3): 72-80 [Abstract] ( 138 ) RICH HTML PDF (5535 KB)  ( 200 )
81 Establishment of the evaluation index system for resources and environment carrying capacity in resource regeneration areas: A case study of Luoning County, Henan Province
LI Wen, GONG Shaojun, LIANG Hao, WANG Guohuai, WANG Peipei
DOI: 10.19388/j.zgdzdc.2021.03.10
In order to establish the evaluation index system of resources and environment carrying capacity in resource regeneration areas, the authors in this paper have carried out 1:50 000 environmental geological survey and geological environment background data collection in Luoning County of Henan Province, in order to find out the resources and environment endowment conditions and its disadvantageous elements. Based on the evaluation of geological environment, groundwater and mineral resources carrying capacity, the authors have adopted the evaluation of mine geo-environment carrying capacity to creatively construct a set of evaluation index system of resources and environment carrying capacity suitable for resource regeneration areas. On the basis of the actual verification and evaluation, through the comparison with the general evaluation index system of resources and environment carrying capacity, the authors have concluded that the mine geo-environment carrying capacity result is different from the geological environment carrying capacity result, and is also different from the mineral resource carrying capacity result. The results above show that the carrying capacity evaluation system in this paper is more suitable for resource regeneration areas with scattered mining areas and different development modes, which could further highlight the regional leading characteristics and provide some reference for geological environment protection and resource development planning in similar areas.
2021 Vol. 8 (3): 81-89 [Abstract] ( 101 ) RICH HTML PDF (4148 KB)  ( 143 )
90 Suitability evaluation of land space development in Taizhou based on urban geological survey results
ZHAO Zengyu, WANG Wei, LI Xiangqian, HUANG Jingjun, Yu Jun
DOI: 10.19388/j.zgdzdc.2021.03.11
The suitability evaluation of land space development is the basis of land space planning, which is of great significance to urban sustainable development. Based on the geological survey achievements of Taizhou and the city development planning, the authors in this paper have fully analyzed the geological resources properties, geological environment security, ecological sensitivity and underground space development suitability. Besides, the evaluation index system of land space development suitability was built and the indexes affecting the suitability were divided into two categories of the restricted and the non-restricted. Compared with the urban space planning, the suitability evaluation of land space development for Taizhou was conducted, and different management measures for different suitable areas in urban space and agricultural space were put forward. The results show that the urban space pattern optimization must be based on the geological resources guarantee and geological environmental security analysis. The suitability evaluation of land space development is the refinement and promotion of urban geological survey results and also the concrete embodiment of the urban geological survey which serves the land space planning.
2021 Vol. 8 (3): 90-97 [Abstract] ( 187 ) RICH HTML PDF (5143 KB)  ( 157 )
98 Landscape characteristics and quality value of Dieshihuagu geological heritage in Youyang County of Chongqing
DENG Yadong, YANG Hongyong, GUO Xiaohong, ZHOU Yongle, WU Xiaoyan
DOI: 10.19388/j.zgdzdc.2021.03.12
Through field investigation of the geological heritage landscape in Dieshihuagu scenic spot of Youyang County in Chongqing, the authors have systematically classified the geological heritage types and discussed the landscape characteristics to conduct the qualitative and quantitative study on geological heritage landscape. The results show the following findings. ① The geological heritage in Dieshihuagu scenic spot are divided into two big categories,three categories and three sub-categories, and the typical representatives are stromatolite, rocky desertification, canyon, depressions, doline, clint, and grike & karren scenic spot. ② Dieshihuagu scenic spot has different landscapes with rare, typical and well-preserved characters and has great value of scientific research, popular science education and tourism. ③ The quality value of the geological heritage landscape in Dieshihuagu scenic spot consists of scientific value and aesthetic value, which is the foundation of science popularization and tourism development of geological heritage landscape, and is affected by the systematicness, typicalness, scientificity and rarity. ④ The stromatolite scenic spot in Dieshihuagu scenic spot is the national geological heritage landscape, and the rocky desertification, canyon and depressions scenic spot is the provincial geological heritage landscape. Besides, the doline, clint, and grike & karren scenic spot is the below-provincial geological heritage landscape. This research could provide references for the scientific protection and science interpretation system development of Dieshihuagu geological heritage landscape.
2021 Vol. 8 (3): 98-105 [Abstract] ( 210 ) RICH HTML PDF (6325 KB)  ( 295 )
106 Construction exploration of municipality-level natural resources surveying and monitoring system:A case study of Xuzhou
CHU Liang, DONG Shiling, FU Lili, XU Lei
DOI: 10.19388/j.zgdzdc.2021.03.13
The survey of natural resources is an important prerequisite and basic work to realize the unified management of natural resources. Through the analysis of natural resources classification system, surveying scheme and database organization, the authors have constructed the natural resources surveying and monitoring system based on the “The Third National Land Survey” and different kinds of special survey data, and put forward the new method of database organization and updating method. These achievements have been verified by the practice in Xuzhou of Jiangsu Province and could provide the nationwide municipality-level survey with a replicable and propagable survey system.
2021 Vol. 8 (3): 106-112 [Abstract] ( 145 ) RICH HTML PDF (3089 KB)  ( 274 )
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