Study On The Environmental Geochemical Characteristics Of Shi Quan And Its Adjacent Areas,Shaanxi Province

Shiquan and neighboring areas in the southern part of Shaanxi Province are an important water source protection area of the Han River and a tourist attraction in southern Shaanxi,with great potential for the development of characteristic resources.In order to find out the characteristics of enrichment and impoverishment,distribution rules and abnormal characteristics of key geochemical elements in Shiquan and neighboring areas,it is expected to provide support for the planting and construction of ecological agriculture,characteristic agriculture,and the planning,construction and development of breeding production bases.Based on the 1:200,000 basic geochemical survey data,this paper analyzes and studies the characteristics of element enrichment changes,environmental geochemical fields and their anomalous characteristics,and on this basis,the characteristics of element environmental geochemical fields are divided.The main results of the thesis are as follows.1.The elements in the study area are divided into 4 major categories,6 combinations,the essential element combination for life is Sr-P-Mg O-Na₂O-Ca O-Si O₂-Fe₂O₃-Cr-Ti,which is the basic and ultra-basic nature of this area.The reflection of the rock;the combination of biologically essential trace elements is B-F-K₂O-Li-Sn-W,Cu-Zn-As-V-Mn-Co-Ni-Mo,which may be related to acidic intrusive rocks and hydrothermal activities in this area;The combination of biologically toxic elements is Al₂O₃-Be-Bi,U-Th-Ba-Sb-Hg-Pb-Ag-Cd,which is toxic to organisms but has no biological function;the combination of non-essential biological elements is Zr-Nb-Au-La-Y.2.The basic characteristics of element distribution in the study area.The study results show that the element content in the study area is compared with the background values of river sediments in Shaanxi Province and the whole country.The elements with enrichment coefficients greater than 1.2 are Ni,Ti,V,Au,Ba,Hg,Cd,and Mo indicate that these elements are relatively enriched.Among them,the coefficient of variation of Ti,Ni,V,Ba,Mo,Hg,and Cd elements is greater than 1,indicating that these elements have a large degree of dispersion in the study area and are extremely uneven Distribution,local enrichment is obvious.The enrichment characteristics of elements in each geological unit:Cambrian(?),Cambrian-Ordovician(?-O),Ordovician(O),Silurian(S)strata,Mo,Cd,The enrichment coefficients of Ag,Ba,Au,and V are all larger,all above 1.2.At the same time,the coefficient of variation of these elements in the above formation is also larger,indicating that these elements are in an enriched state in this lithological unit,and their distribution is extremely different.Uniform;the Mo,Cd,Sb,Hg,and V enrichment coefficients in the Carboniferous(C)and Permian(P)strata all exceed 1.5,and the coefficient of variation is also large,indicating that these elements are enriched in this lithological unit State,and the distribution is extremely uneven.3.The characteristics of the environmental geochemical field of the elements:the major biologically essential elements,and their high background fields are mainly distributed in the area of Shuangxi Town-Ziwu Town-Cha Town in the northwest of the study area,and to the east of Houliu Town in the south-central part-Wuai Villages,Jianchi Town-Shuangru Town-Tanba Town-Dahe Town in the southeast,and Chaiping Town in the northeast;low background fields are mainly distributed in the west of Longwang Town,Yeping Town and Zhongyuan Town in the north of the study area.The bio-essential trace elements.The high background field is mainly distributed in the area of Gaochuan Town-Tongdou Town-Lianghekou Town in the southwestern region of the study area,Houliu Town-Hanwang Town in the south-central area,and Chaiping Town in the northeast;low background The farms are mainly distributed in Jianchi Town-Shuangxi Town in the northwest of the study area.Biological non-essential elements,the high background field is mainly distributed in the Gaochuan Town-Tongdou Town-Worth Town in the southwest of the study area,and near Cigou Town in the east;the low background field is mainly distributed in Ziwu Town in the northwest of the study area and the northern part of the study area.Around Longwang Town and Yeping Town.Toxic elements to organisms,the high background field is mainly distributed in Shangqi Village in the south of the study area,Gaochuan Town-Tongdou Town-Huobi Town in the southwest,and Dabahe Town and Lianghe Town in the northwest;low background field Mainly distributed in and around Hanyin County in the south-central part of the study area.The results of element distribution under different land use types show that the main influencing factors of element distribution in the study area are natural factors(soil parent material),and individual elements such as as as,Ba,CD,Mn,P,Pb,Ti and Fe₂O₃are affected by human factors.4.In the study area,a total of 8 comprehensive anomalies were circled.Among them,HS-1(abnormal elements:F,Mo,Ni,P,V,W,Zn)is mainly affected by natural factors such as soil parent material,while human factors have little influence on it;HS-2(abnormal elements:CO,Cu,Mn,Ni,Zn)are all biologically necessary elements,reflecting a good ecological and geochemical environment.The distribution of elements in this area is mainly affected by human factors;HS-3(abnormal elements:P,Cr,Ni,Co,Cu,Cao).The anomaly of elements in this area is mainly caused by human activities;HS-5(abnormal elements:Mo,Ni,P,V,Zn,Ag,Ba,CD,Hg,Sb),HS-6(abnormal elements:B,Cao,Fe₂O₃,Mn,P,Ti),HS-7(abnormal elements:Cr,Cu,Mo,Ni,P,V,Zn),except that AG,Ba,CD,Hg,Sb in HS-5 are harmful elements to organisms,the rest are necessary elements for organisms,HS-5,HS-6 The distribution of elements in HS-7 anomaly is mainly affected by natural factors such as soil parent material,but less by human activities,which reflects the better ecological and geochemical environment of elements;HS-4(abnormal elements include:biological essential elements:as,Co,Mn,Mo,Ni,P,V,Zn;The abnormal scale of toxic elements to organisms(Ag,Ba,Cd,sb)is small.The abnormal scale of elements in the area is mainly affected by natural factors such as soil parent material,and the influence of human activities is small,which reflects the better ecological and geochemical environment of elements.5.The study area is divided into 7 geochemical zones:Sangxi Town-Cha Town(?):It is an area that is very beneficial to human health,especially Sangxi Town and Ziwu Town are the best crop planting and ecological health areas;Muzhuba-Gaochuan Town(?):The element distribution in this area is obviously controlled by faults,and beneficial and harmful elements are enriched at the same time near Gaochuan Town.It is recommended to suppress the absorption of harmful elements by plants through soil remediation;Flatiron Town-Shangqi Village(?):The north bank of the Han River is more suitable for the establishment of a health care zone,and the south bank of the Han River recommends proper soil remediation to inhibit the activity of harmful elements;Ningshan-Taishan Temple(IV):The area of Chaiping Town in the eastern part of the subregion is rich in beneficial elements Jiji,is a good ecological health care area,the terrain and geochemical conditions near Ningshan County-Taishanmiao Town in the west of this subregion are poor;Longwang Town-Yeping Town(V):Zhongyuan Town in the east of the district The elemental ecological and geochemical environment is good,and it is a good health care area.Longwang Town and Yeping Town in the central area are poor in traffic,topography and geochemical conditions;Lianghe Town-Yunwushan Town-Guanyinhe Town(VI):The district should focus on densely populated places such as Cigou Town,Yingfeng Town,and the east of Daheba Town.It is recommended to take corresponding measures to inhibit the activity of harmful elements Cd and Ba.Hanyin-Hengkou(?):The district has a flat terrain,convenient transportation,and the highest availability.It is also a high background area for the beneficial elements Mo and the harmful elements Cd and Hg.Both beneficial and harmful elements are rich.It is recommended to do further investigation and research to eliminate the influence of harmful elements from the perspective of effective state of the elements.