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2020 Vol. 7, No. 6
Published: 2020-12-20
1
Main progress and achievements of the geological survey project of Sichuan-Tibet Railway traffic corridor
GUO Changbao, WANG Baodi, LIU Jiankang, TU Jienan, ZHANG Yongshuang, MA Jianfei, TIE Yongbo, HAN Bing, MA Xin, LIU Feng, LI Xue, MENG Wen, ZHONG Ning, YANG Zhihua, WU Ruian
DOI: 10.19388/j.zgdzdc.2020.06.01
Sichuan-Tibet Railway is a key project planned and constructed in China. It is located in Eastern Qinghai-Tibet Plateau where the terrain, geomorphology and tectonic activity are extremely complex. There are a series of serious geological problems that need to be solved urgently in its planning and construction period, such as regional active faults with their disaster effects, high geostress with resulted rockburst and large deformation, geological hazards, high temperature with heat damage, high pressure water and mud inrush in fault zone, stability of high and steep slope. In order to support the needs of technical support for the planning and construction of Sichuan-Tibet Railway and to accurately serve the implementation of major national strategies, China Geological Survey has deployed the Geological Survey Project of Sichuan-Tibet Railway Traffic Corridor,which is focused on the key issues restricting the planning and construction of Sichuan-Tibet Railway, and plays an important role in the planning and construction of major national projects. In 2019, it mainly completed 1 350 km
2
of 1:50 000 regional geological survey, and 5 000 km
2
of 1:50 000 geological hazard survey. six geothermal flow geological parameter wells and etght earth temperature monitoring stations were also constructed. Twehty geostress measurement holes and 11 special geological survey reports were completed. The route optimizat suggestions and disaster prevention suggestions proposed for Dadu River Bridge, Litang Station, and Maoyaba Basin were adopted. The 1:5 000 large-scale aerial geophysical technology was introduced into the survey of complex mountain railway engineering for the first time, and the directional core drilling technology for ultra-long horizontal boreholes at a kilometer level was innovated with a major breakthrough. Besides, the measurement of geostress in horizontal boreholes with a depth of 500 meters was achieved. Overall, the project has improved the degree and accuracy of geological surveys along the railway through the survey and research in 2019. And the theoretical methods of major engineering geological problems and detection technologies in complex and difficult mountainous areas, geological disaster risk prevention, control theory, and key disaster reduction technologies were innovated, which effectively supported the planning and construction of Sichuan-Tibet Railway.
2020 Vol. 7 (6): 1-12 [
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495
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13
Geological characteristics and genesis of the REE-Nb polymetallic deposit in Huishishan of Ejinaqi in Inner Mongolia
CHEN Haidong, WANG Zhanfu, LU Ning, ZHANG Haifeng, XIE Jianxi
DOI: 10.19388/j.zgdzdc.2020.06.02
Huishishan REE-Nb polymentallic deposit located in the northern margin of Alxa Massif ang is a large-scale REE-Nb polymetallic deposit discovered in recent years. Through the systematic trench drilling, field geological investigation and petrographic study, the authors investigated the genesis and the ore-forming materials source of this REE-Nb deposit. The deposit is closely related with the alkali syenite and is of two different genetic types respectively magmatic crystallization differentiation type and hydrothermal metasomatism type. The metallogenic model was establieshed by summarizing the prospecting criteria of the deposit. The hydrothermal metasomatic deposit was controlled by faults, and the syenite magma was passively emplaced along faults. Then the fluid emerged out of the melt, with the further drastic drop of the temperature and pressure. The siliceous fluid rich in Nb, REE and volatile elements (mainly F and Cl) reacted with wall rocks, and finally the REE-Nb deposits were formed in favorable places. The alteration degree of limonization, pyritization and silicification in the wall rocks of the deposit is positively related to the contents of rare earth and niobium, and the boundary between the ore body and wall rocks is not obvious. The syenite magma was proactively emplaced along faults, with crystallization differentiation. The incompatible elements (Nb, REE, etc.) enriched in the residual melt and formed the magmatic crystallization differentiated deposit in the syenite. The alkaline syenite magmatism in Huishishan area provides material source for the formation of REE-Nb polymetallic deposit.
2020 Vol. 7 (6): 13-19 [
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249
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20
Geological characteristics and ore genesis of Houfangzi graphite deposit in Northwestern Hebei Province
ZHANG Xingkang, FAN Yupeng, JIN Song, JIA Zhenghai
DOI: 10.19388/j.zgdzdc.2020.06.03
Houfangzi graphite deposit is located in the middle of the graphite metallogenic belt in the northern margin of North China Block in Hebei Province, which belongs to regional metamorphic type graphite deposit. In this paper, through rock-mineral determination, IP ladder sections and exploratory trench survey, the authors have discussed its metallogenic geological characteristics and ore body characteristics, and analyzed its ore genesis. The research results show that the ore bodies are mainly in the graphitic marble of Dongjingzi Formation of Hongqiyingzi Group, which are stratified and controlled by layers, with NE trend and NNW inclination. The IP anomaly shows that Houfangzi graphite deposit is characterized by low resistance and high polarization. Ore bodies are stable and of big scale, and their fixed carbon content ranges from 1.42% to 3.28%, which has the potential to be a large graphite deposit. The ore-forming material came from granulite and graphite marble, while the regional metamorphism is the main mineralization of Houfangzi graphite deposit, with the enrichment and increasement caused by late magmatic activity and migmatization.
2020 Vol. 7 (6): 20-26 [
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197
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27
Geological Characteristics and resources comprehensive utilization of andalusite mine in Rongxuka area, Daofu County, Sichuan Province
QIN Yulong, ZHAO Chun, ZHAN Hanyu, XIONG Changli, XU Yunfeng, WU Wenhui, LI Zheng, LI Mingze
DOI: 10.19388/j.zgdzdc.2020.06.04
As advanced refractory and main mineral for extracting silicon aluminum alloy, the andalusite can be used in industry of metallurgy, building materials, ceramics, aviation and so on. The demand for andalusite will keep increasing along with the development of social economy. Rongxuka tectonic-magmatic dome is situated in the east of Songpan-Ganzi Orogenic Belt in Sichuan Province, and the flysch strata of the passive continental margin dominated by Triassic Xikang Group are widely distributed in the area. The core and periphery of the tectonic-magmatic dome are intruded by Indo-China period granodiorite and pegmatite veins. The contact metamorphic zone is mainly andalusite two-mica schist, andalusite-staurolite-mica schist, staurolite-andalusite-contained two-mica schist, two-mica schist and so on. There are non-metal deposits such as andalusite, staurolite in the schist, and rare-metal deposits such as lithium and beryllium in the pegmatite veins. The Al
2
O
3
and SiO
2
contents of the andalusite of Rongxuka area are 61.44% and 37.11%, and the (K
2
O + Na
2
O) and FeO are 0.18% and 0.15% respectively, which can meet the industrial requirement of advanced refractory, technological ceramic and silicon-aluminum alloy raw materials. By investigation on the spot, the authors identified the prospective andalusite resource of the area is 2.3 tons, above the standard of large scale. There is a considerable amount of andalusite resource in Kangding-Yajiang-Daofu belt of Sichuan Province. With the transference of the national construction focus toward western areas, there are remarkable advantages of the comprehensive utilization and favorable development prospect of andalusite deposit, which might hopefully become the biggest or world-class andalusite deposit in China. It may alleviate the condition that part of the minerals relies on importation.
2020 Vol. 7 (6): 27-34 [
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234
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35
Chemical composition of the chromite and diamond potentiality of Bailushan rock mass in Suining area of Xuzhou
ZHOU Qizhong, ZHANG Qi, FENG Xuezhi, WANG Bo, QIU Lei, WANG Guoqiang
DOI: 10.19388/j.zgdzdc.2020.06.05
Bailushan rock mass is an important diamond-bearing rock mass in Northern Jiangsu Province. On the basis of the chemical composition of the chromite in Bailushan rock mass, the authors discussed its genesis and significance of the diamond potentiality and analyzed the diamond mineralization potential of Bailushan rock mass. The chromite in Bailushan rock mass has characteristics of high Cr, low Al and high Mg, which belongs to the magnochromite. It was crystallized from the peridotite that originated from the deep mantle, not a crystalline product of the rock mass, which is most likely derived from a deep-source trap in the rock mass. The crystallization temperature is 1 253~1 354 ℃, which is consistent with the formation temperature of the diamond (1 150~1 400 ℃), indicating a close relationship between them. The chemical composition of the chromite from Bailushan rock mass is very similar to that from the ore-bearing kimberlites in Shandong and Liaoning. Most chromites belong to S4 and S6, and a few chromites belong to S1 and S2. S1 and S2 chromites are the marked minerals of diamond-bearing rock mass. Bailushan rock mass has good diamond potential and prospecting prospects.
2020 Vol. 7 (6): 35-42 [
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224
)
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43
Discovery and significance of Lizifang metamorphic core complex in Zhuanghe area of southern Liaoning
ZHONG Mishan, ZHANG Guoren, WU Zijie, GAO Fuliang, MA Ningning, PAN Yuqi, GAO Yongzhao
DOI: 10.19388/j.zgdzdc.2020.06.06
On the basis of the previous regional geological survey, based on the macroscopic and microscopic structural survey, combined with the comprehensive analysis of the regional magmatic activity and dating data, the authors in this paper revealed that there is another metamorphic core complex structure in Lizifang area of Southern Liaoning, namely Lizifang metamorphic core complex. A typical three-layer structure and five parts exist in the core complex, which are the footwall composed of Neo-archean metamorphic plutonic rocks and mesozoic granite intrusive rocks, the detachment fault zone composed of different levels of tectonic rocks, and the upper plate composed of Precambrian sedimentary cap and Cretaceous extensional basin. Lizifang metamorphic core complex formed in the Early Cretaceous Epoch, and the upper plate moved from NWW to SEE relaive to the footwall, which was similar with Jinzhou metamorphic core complex and Wanfu metamorphic core complex in geometry, kinematics polarity and formation time, indicating the same dynamic background. The determination of the metamorphic core complex may provide a basis for the late Mesozoic lithospheric thinning process and the mechanical and rheological properties of the lithosphere in the east of North China Craton. At the same time, the metamorphic core complex is closely related to the mineralization of gold deposits. So the detachment fault zone of Lizifang metamorphic core complex can serve as the key work area for further gold exploration, which may possess large mineralization potential.
2020 Vol. 7 (6): 43-50 [
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226
)
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51
Geochronological and geochemical characteristics and geological significance of the monzogranite in Xiarihamu area of East Kunlun
GUO Feng, WANG Panxi, BIAN Xiaodong, FENG Naiqi
DOI: 10.19388/j.zgdzdc.2020.06.07
The Early Devonian monzogranite was reported for the first time in Xiarihamu area of East Kunlun, so the authors investigated its geochronological and geochemical characteristics to further explore the petrogensis and tectonic setting. The U-Pb of zircon age of the monzogranite is (412.1 ± 5.7) Ma (MSWD = 0.95), which formed in early Early Devonian, and the monzogranite belongs to slightly peraluminous subalkaline series. The monzogranite is characterized by high SiO
2
(71.41% ~ 72.46%) and K
2
O (5.27% ~ 6.16%), low Fe
2
O
3
(1.86% ~ 2.05%) and P
2
O
5
(0.08% ~ 0.12%), and high LREE with obvious negative Eu anomalies. Rb, Th, Zr and Hf are obviously enriched, while Nb, Sr, P, Ti and Ba are strongly depleted on the primitive mantle-normalized trace element spider diagram. The monzogranite in Xiarihamu area belongs to I-type granite, and the magma of the source rock may come from the partial melting of the lower crust materials caused by the underplating heating of mantle-derived magma. The monzogranite was formed in the tectonic environment of syn-collision converting to post-collision, suggesting that Xiarihamu area of East Kunlun had been in the post-orogenic extension stage since early Early Devonian.
2020 Vol. 7 (6): 51-60 [
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194
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61
Radioactive geophysical features of Haizishan area in Litang of Sichuan Province
CAO Yun, WANG Guanghui, MA Changwei, WANG Yongfei
DOI: 10.19388/j.zgdzdc.2020.06.08
In order to investigate the radioactive geophysical features, uranium metallogenetic geological setting and metallogenetic conditions at Haizishan area, the ground total gamma survey and geology-gamma spectrometric profile survey were conducted. The radioactive background of Haizishan area was preliminarily cognized through the ground total gamma survey and the radioactive features were identified. The anomaly properties of Late Yanshan granites were roughly confirmed through geology - gamma spectrometric profile survey, and the detailed statistical analysis was done for radionuclide contents of each major lithostratigraphy. The results show that Late Yanshan granites in this area have higher total gamma background value, and the distribution of total gamma anomaly is almost consistent with Late Yanshan granites. The uranium background value of the granites is higher, showing the uranium sources are favorable in this area. There is Chaqingka hot-spring anomaly in the western periphery of Haizishan area, which is in connection with the northwest fault. The sinter on the ground has very high total gamma measurement value, and the uranium - thorium anomaly occurrence is shown through gamma spectrometric survey. According to the geological and radiometric properties of Chaqingka hot-spring anomaly, combined with the uranium metallogenetic geological setting and metallogenetic conditions in the area, the authors identified that the potential source of uranium is bearing fluids containing uranium or the uranium is likely to be abundant in deep Late Yanshan granites. The uranium is migrated to deposit and enrich at the surface, which provides a prospecting target for further uranium exploration.
2020 Vol. 7 (6): 61-67 [
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238
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68
Petrogenesis and sedimentary environment of silicate in Late Paleozoic in Kala area of Western Sichuan Province
LIU Daming, YAO Hongyou, HU Lin, YU Liang, LIU Yizhong
DOI: 10.19388/j.zgdzdc.2020.06.09
In order to study the sedimentary environment characteristics of the Late Paleozoic in Kala area of Western Sichuan Province, the authors have conducted the petrological and geochemical analyses of the widely distributed silicate in Qiongyi Formation of Lower Carboniferous and Kawenggou Formation of Upper Permian. The results show that the silicate in the study area belongs to the pure siliceous rocks, with a continuous supply of land-based materials during the deposition process. The average Al/(Al+Fe+Mn) ratio is 0.62, and the silicate shows a biogenic origin by the Al-Fe-Mn diagram. The ratios of Al
2
O
3
/ (Al
2
O
3
+ Fe
2
O
3
), Th/U, Th/Sc, (La/Ce)
N
and (La/Yb)
N
and tectonic environment discriminant diagram demonstrate that the silicate developed in a shallow-slope depesitional environment in the continental margin. The Ce
anom
value is -0.04 to 0.07, and it gradually increases from the Carboniferous to the Permian period, indicating the water body is in an anoxic environment with gradually increasing reducibility. The Garz--Litang basin opened in the Carboniferous period, in accordance with the regional geological evolution, and it continued to expand during the Permian period, with the gradually increasing depth of the seawater within the sedimentary basins.
2020 Vol. 7 (6): 68-78 [
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312
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79
Distribution patterns and potential ecological risk evaluation of heavy metals in the surface sediments of Beibu Gulf
TENG Deqiang, CUI Zhenang, YUAN Xiaojie, ZHANG Liang
DOI: 10.19388/j.zgdzdc.2020.06.10
The contents and distribution patterns of the heavy metals including Cu, Pb, Zn, Cd, As and Hg in the surface sediments of Beibu Gulf have been analyzed to understand the current pollution situation and the eclogical risk in Beibu Gulf. Hakanson's Potential Ecological Risk factors and indices were used to assess the potential ecological risk of heavy metals to marine ecosystem in Beibu gulf. The results showed that the contents of Cu,Pb,Zn,As and Cd were low, but in some sites Hg was higher than National Marine Sediments of I Quality Standard. The distribution trend of all the six heavy metals was similar in Leizhou Peninsula, Northwest and South Hainan Island, and the high value zone appeared in the vicinity of Dongfang City. The results of principal component analysis showed that the three major sources of heavy metals contamination were industrial wastewater, agricultural wastewater and degradation of organic matter, with the first three principal components contribution rates of 47.13%, 18.44% and 18.35%. The potential ecological risk of heavy metals for the single element shows that the potential ecological risk order of these heavy metals is Hg>Cd>As>Pb>Cu>Zn.And the potential ecological risk of As, Pb, Cu, Zn and Pb is minor, and the potential ecological risk of Hg is great. The comprehensive analysis of potential ecological risk of heavy metals show that Beibu gulf is of intermediate level, while some areas have reached strong level. The estuary of Changhua River has the lowest sediment environmental quality, and more attention must be paid to these areas.
2020 Vol. 7 (6): 79-85 [
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248
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86
Analysis of the effect of Water Diversion and Source Supplement Project on groundwater recharge in Daixi River Basin
WAN Junwei, WANG Mingzhu, LIU Zhitao, YANG Yabin, LIU Yi, ZHAO Shuxing
DOI: 10.19388/j.zgdzdc.2020.06.11
The South-to-North Water Diversion Project is a major national water conservancy project, but the effect of the water transfer depends on the utilization of water in the receiving areas. Water Diversion and Source Supplement Project is a specific utilization of the South-to-North Water Diversion Project in Zouping City. In order to analyze the effect of Water Diversion and Source Supplement Project on groundwater recharge in Daixi River Basin, the authors adopted the water balance method to calculate the groundwater recharge and total recharge of water diversion sources, based on the analysis of the groundwater recharge items in Daixi River Basin after carrying out this project. The total recharge is regarded as the amount of exploitable groundwater resources. The exploitable potential of groundwater resources in this area is evaluated by the comparison of the amount of exploitable groundwater resources and the actual amount of groundwater exploitation, and the effect of Water Diversion and Source Supplement Project on the over-exploitation of groundwater on the remission area was also demonstrated. Besides, the effective replenishment effect of this project on the groundwater in the study area was also revealed based on the annual groundwater and multi-year groundwater level dynamic monitoring data, which provides some reference for the rational development and utilization of groundwater resources in this region.
2020 Vol. 7 (6): 86-95 [
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185
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96
Remote sensing survey and results analysis of geological resources for tourism in Yangquan area of Shanxi Province
WANG Haoqian, WANG Mingming, LIU An, GUO Zhenbin, WANG Botao
DOI: 10.19388/j.zgdzdc.2020.06.12
In order to investigate the distribution of geological resources for tourism in Yangquan area of Shanxi Province, grasp the current situation of geological resources for tourism by the government, and seek for the exploitation, protection and development planning of the geological parks, the Department of Natural Resources of Shanxi Province (Former Department of Land and Resources of Shanxi Province) carried out the remote sensing investigation of geological resources for tourism in Yangquan area in 2018. Based on the 3D visualization remote sensing images and visual interpretation together with exiting geological data and field survey resurts, the authors acquired the distribution information of the geological resources for tourism. A densdly distributed geological resources zone, appeared as a crescen, was identified in Central and East Yangquan. This zone was from Hidden Mountain in Yuxian area in the west, to Yuhuang Hole in the southeast, and finally to Niangzi Pass of Pingding. It was mainly distributed in the carbonate geomorphology and contained the mountain landform landscape, karst landform landscape and spring landform landscape, which was a large and typical outcrop in North China, with widespread distribution and high exploitation potential. The establishment of a northern carbonate rock landscape multi-type genetic geopark in the zone of Hidden Mountain tourist area -- the karst landscape belt scenic area -- Niangzi Pass tourist area was suggested.
2020 Vol. 7 (6): 96-102 [
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205
)
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103
Quantitative characterization of different coal rank reservoirs permeability based on NMR and X-CT technology
GUO Guangshang, XING Liren, LI Hao
DOI: 10.19388/j.zgdzdc.2020.06.13
With the increasing development of coalbed methane (CBM) field, the quantitative characterization and evaluation of coal reservoir physical properties is becoming more and more important to CBM scale development. In order to solve the limitations of conventional methods for testing coal reservoir physical properties, the authors used the high-tech technologies such as nuclear magnetic resonance technology and CT scanning technology to effectively solve the problems of in-situ and integrity of rock samples and acquire the porosity and permeability. Nuclear magnetic resonance and CT scanning experiments of coal samples were carried out to rapidly obtain the pore type, pore size distribution and connectivity, effective porosity, spatial distribution of pore fissures and other refined coal reservoir physical parameters, based on the samples of middle and low rank coal in Shenfu block and high rank coal in Shizhuangnan block. So a set of quantitative characterization analysis technology that can be applied to coal reservoirs with different coal rank was formed.
2020 Vol. 7 (6): 103-108 [
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211
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109
Application of comprehensive geophysical prospecting method in ore prospecting in coverage area: A case study of integrated survey area of Wuhe Gold Mine in Eastern Anhui
ZHANG Jiajia, ZHANG Shunlin, WANG Qingsong, GU Danian
DOI: 10.19388/j.zgdzdc.2020.06.14
Wuhe area is located in the southern section of Tan-Lu fault zone,and most of the area is covered by the Quaternary and has complex structures. It is difficult to carry out basic geological survey,and no prospecting breakthrough has been made for a long time. In order to obtain geological prospecting information, comoined with regional geological features the authors have used the comprehensive geophysical method to interpret the anomalies, which can screen the mine-induced anomalies effectively and improve the success rate of drilling verification. By carrying out medium and large scale complex geophysical detection, the authors have developed the medium and large scale combination bedrock detection technology for geological structures in the coverage area. And combined with the repeatedly circulation of three or four phases in one selection comprehensive exploration model of the coverage area, the difficulty of finding gold mines in the deep part of the coverage area under complex structural conditions has been overcome and important prospecting achievements have been made. Two medium-sized gold mines and one small-sized gold mine have been found, and the total scale has reached a large size. A major breakthrough in finding gold mines in Tan-Lu fault zone in Anhui Province has been realized. The medium and large scale complex geophysical detection and the repeatedly circulation of three or four phases in one selection exploration model have important significance in the exploration of gold-polymetallic deposits in thick coverage areas.
2020 Vol. 7 (6): 109-115 [
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222
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