Evaluation of Trace Elements in the Soil of Typical Peach Orchards in Zunyi City

[Objectives]This study was conducted to clarify the enrichment and paucity of trace elements in the soil environment of peach orchards in Zunyi City,and to provide reference for supplementary application of microelement fertilizers and high-quality peach production in peach orchards.[Methods]Taking the soil of three typical peach orchards(Taoli Renjia peach orchard,Pengrui peach orchard and Taohuadao peach orchard)in Shenxi Town,Honghuagang District,Zunyi City as the research object,the contents of trace elements in soil were analyzed through field sampling and indoor determination of trace elements.[Results]The effective contents of trace elements in the soil of peach orchard bases in the study area were at a medium level,and the soil of the peach orchards was rich in available Fe and Se.The contents of available Cu,Mo and Mn were relatively rich.The contents of available B were not high overall.The contents of available Zn were at a moderate to low level overall.The soil of Taoli Renjia peach orchard was relatively rich in trace elements.[Conclusions]The research results can provide a scientific basis for the production of high-quality crispy peaches in peach orchards.

Research on the Spatio-Temporal Evolution and Driving Forces of Green Spaces in the Central Urban Area of Zunyi City

Green space,as a medium for carrying out urban functions and guiding urban development,is becoming a scarce resource along with the urbanization process and the intensification of environmental problems.In the face of the spatial mismatch between high demand and low supply,it is of great significance to clarify the evolution mechanism of green space to undertake national spatial planning,protect the natural strategic resources in the urban fringe area,and promote the sustainable development of the“three living spaces.”The study focuses on the Zunyi City Center,selecting the 20 years of rapid development following its establishment as a city as the study period.It explores the dynamic evolution of green space and the main driving forces during different periods using remote-sensing image data.The study shows that from 2003 to 2023,the total scale of green space has an obvious decreasing trend along with the expansion of the urban built-up area.A large amount of arable land is being converted to construction land,resulting in a sudden decrease in arable land area.In the past 10 years,the comprehensive land use dynamics have accelerated.Still,the spatial difference has gradually narrowed,indicating that the overall development intensity of Zunyi City’s central urban area has increased.There is a gradual spread of the trend to the hilly areas.The limiting effect of the mountainous natural environment on the city’s development has gradually diminished under the superposition of external factors,such as economic development,industrial technological upgrading,and policy orientation so the importance of the effective protection and rational utilization of urban green space has become more prominent.

Analysis on the Economical and Intensive Utilization of Regional Construction Land in Zunyi City of Guizhou Province

Taking Zunyi City of Guizhou Province as research area, the research performed spatial dynamic analysis and elastic coefficient method to evaluate the e- conomical and intensive utilization of the regional construction land, and to discuss the decision direction for economical and intensive utilization of the regional con- struction land. The results showed that, the population based land utilization both in Zunyi and the city districts and counties indicated extensive trend. The economy- based land utilization in Zunyi City, as well as in Huichun, Zunyi and Tongzi County presented intensive trend, however the other districts and counties were in extensive tendency. It concluded that the economical and intensive utilization of construction land should be focused on the rural collective construction land, and the potential tapping of rural collective construction land in rocky desertification area should be the first priority, otherwise, the regional economic development was unbalanced be- tween different district and county in Zunyi.

Genesis for Rare Earth Elements Enrichment in the Permian Manganese Deposits in Zunyi, Guizhou Province, SW China

The Zunyi manganese deposits, which formed during the Middle to Late Permian period and are located in northern Guizhou and adjacent areas, are the core area of a series of large-medium scale manganese enrichment minerogenesis in the southern margin and interior of the Yangtze platform, Southern China. This study reports the universal enrichment of rare earth elements(REEs) in Zunyi manganese deposits and examines the enrichment characteristics, metallogenic environment and genesis of REEs. The manganese ore bodies present stratiform or stratoid in shape, hosted in the silicon–mud–limestones of the Late Permian Maokou Formation. The manganese ores generally present lamellar, massive, banded and brecciated structures, and mainly consist of rhodochrosite, ropperite, tetalite, capillitite, as well as contains paragenetic gangue minerals including pyrite, chalcopyrite, rutile, barite, tuffaceous clay rock, etc. The manganese ores have higher ΣREE contents range from 158 to 1138.9 ppm(average 509.54 ppm). In addition, the ΣREE contents of tuffaceous clay rock in ore beds vary from 1032.2 to 1824.5 ppm(average 1396.42 ppm). The REEs from manganese deposits are characterized by La, Ce, Nd and Y enriched, and existing in the form of independent minerals(e.g., monazite and xenotime), indicating Zunyi manganese deposits enriched in light rare earth elements(LREE). The Ceanom ratios(average-0.13) and lithofacies and paleogeography characteristics indicate that Zunyi manganese deposits were formed in a weak oxidation-reduction environment. The(La/Yb)ch, Y/Ho,(La/Nd)N,(Dy/Yb)N, Ce/Ce* and Eu/Eu* values of samples from the Zunyi manganese deposits are 5.53–56.92, 18–39, 1.42–3.15, 0.55–2.20, 0.21–1.76 and 0.48–0.86, respectively, indicating a hydrothermal origin for the manganese mineralization and REEs enrichment. The δ13 CV-PDB(-0.54 to-18.1‰) and δ18 OSMOW(21.6 to 26.0‰) characteristics of manganese ores reveal a mixed source of magmatic and organic matter. Moreover, the manganese ore, tuffaceous clay rock and Emeishan basalt have extremely similar REE fractionation characteristic, suggesting REEs enrichment and manganese mineralization have been mainly origin from hydrothermal fluids.

贵州遵义共青湖锰矿床主要地质特征及深部找矿潜力分析

共青湖锰矿床与铜锣井大型锰矿床、深溪大型隐伏富锰矿床同位于深溪-八里Ⅲ级地堑盆地中,含锰岩系为茅口组第三段,锰矿体位于含锰岩系下部,矿体埋深800~450 m,锰矿体厚度小但较稳定,一般为0.8~0.9 m,Mn平均品位为16.62%,目前深部矿体尚未圈边。通过对共青湖锰矿床地质特征分析,认为其属“气液喷溢沉积型”锰矿床,总体位于成锰过渡相中,显示该区深部有较大找矿潜力。

贵州遵义市冯家湾锰矿地质特征及找矿潜力

冯家湾锰矿位于黔北裂谷盆地锰矿区内遵义-黔西锰矿成矿带,属于遵义锰矿成矿亚带的深溪-八里锰矿带,遵义锰矿主要分布在该锰矿带内,位于冯家湾Ⅳ级地堑盆地沉积中心位置。埋藏深度为0~557 m,矿体赋存于二叠纪茅口组第三段,Mn平均品位为13.69%,平均厚度为1.37 m;研究区内浅部为氧化锰矿石,深部为碳酸锰矿石,碎屑状、鲕状和块状构造。通过对冯家湾锰矿地质特征分析,认为其属于典型的“气液喷溢沉积型”锰矿床,位于成锰中心边缘,显示具有较大的找矿潜力。

沉积型铝土矿及其含矿岩系在溶蚀洼地中的沉积特征——以遵义后槽矿区为例

位于遵义铝土矿带中部的后槽矿区,受NE-SW向岩溶盆地控制,溶盆内分布有众多形态各异的中、小型溶洼、溶坑和溶沟,在这些溶蚀洼地中,沉积了下石炭统九架炉组的铝土矿含矿岩系。其中主要有似泥石流沉积、沼泽、泥炭沼泽沉积和洪泛漫流沉积。似泥石流沉积物与沼泽、泥炭沼泽沉积物多次交替重叠,构成了多个沉积旋回,表明沉积环境发生过多次周期性变化。似泥石流沉积和洪泛漫流沉积,是形成铝土矿的主要沉积作用。洪泛漫流沉积形成的、覆盖全区所有溶蚀洼地的铝土矿体最为重要,称为"主流面状矿体"。"主流面状矿体"形成之后,本区原始的红土风化壳物质向九架炉组铝土矿含矿岩系沉积物的转变阶段即告终结。铝土矿含矿岩系的形成,主要是在各种溶蚀洼地中陆相复合沉积作用的结果。

遵义市历史遗留废弃矿山生态环境修复探讨

文章针对遵义市历史遗留废弃矿山的生态修复问题,结合2021年的矿山核查数据,分析了全市历史遗留废弃矿山的分布、矿种类型、开采方式和存在的生态问题,构建了以砂石矿为主、煤矿、硫铁矿、钼镍矿多点分布的四大类矿山生态环境修复格局。结合国内相应矿种矿山修复成功案例,针对不同的矿种类型提出相应的生态修复思路,为遵义市国土空间生态环境修复规划矿山部分提供科学理论参考。

贵州遵义红花岗区转龙庙锰矿床主要矿床地质特征

贵州遵义红花岗区转龙庙中型锰矿床是典型的贵州二叠纪“遵义式”锰矿床之一,利用转龙庙锰矿勘查成果,较详细地总结了矿床地质、矿体地质和矿石特征。锰矿体产于二叠系茅口组第三段含锰岩系底部,呈层状、似层状产出,夹石少见,其产状与地层产状一致,矿石矿物以菱锰矿为主,脉石矿物以黏土矿物为主,Mn平均含量为20.83%,矿石自然类型为碳酸锰矿石,工业类型为高硫、高铁,以及造渣组分亦较高的低磷、低硅酸盐贫锰矿石。矿床成因属气液喷溢沉积型锰矿床。

贵州遵义钼镍矿区放射性核素环境影响评价

文章选取贵州省遵义钼镍矿区为研究对象,通过环境地表γ辐射剂量率、土壤氡气浓度以及岩石中天然放射性核素(^(238)U、^(232)Th、^(40)K)含量,研究其放射性核素水平,通过研究表明:研究区γ辐射剂量率平均值为280.83nGy·h^(-1),各矿区之间γ辐射剂量率水平差距比较明显,各钼镍矿区废渣γ辐射污染水平较高;研究区渣场氡浓度水平平均值为100.37Bq·m^(-3),各矿区之间氡浓度水平差距比较明显,所调查的矿区渣场数据表明矿区氡浓度水平较高,这反映出矿山放射性水平相对较高,可能是由于黑色岩系中放射性水平较高造成的;矿渣中eU含量范围为7.52×10-6~721.61×10-6,平均值103.62×10^(-6);eTh含量范围为5.91×10^(-6)~344.84×10^(-6),平均值19.53×10^(-6);K含量范围为0.1%~4.96%,平均值1.53%。部分样品中铀含量超过边界品位,说明铀含量较高。据此,文章提出相关防治措施。

贵州遵义市复兴隐伏锰矿床地质特征及找矿潜力分析

位于贵州遵义国家锰矿整装勘查区内的复兴隐伏富锰矿床,埋藏深度达1300~1550 m,矿体赋存于二叠纪茅口组第三段,Mn平均品位为18.01%,平均厚度为2.12 m;矿石矿物以菱锰矿为主,局斑杂状、浸染状和块状构造。通过对复兴锰矿床地质特征分析,认为其属于典型的“遵义锰矿内生外成气液喷溢沉积型”锰矿床,位于茅口晚期深溪IV级地堑盆地内深溪-复兴成矿带的成锰边缘相,其北部为成锰中心相,显示具有较大的找矿潜力。

遵义矿区瓦斯抽采技术现状考察研究

通过对遵义矿区瓦斯矿井分布情况、瓦斯抽采实施及效果考察并统计分析,得到了瓦斯抽采技术使用情况,分析出了遵义片区瓦斯抽采的特点及存在的缺陷,为下一步瓦斯抽采技术措施的优化及片区瓦斯防治综合管理提供了基础支撑,也为提高片区煤矿安全生产水平提供了有效途径。

贵州遵义锰矿区土壤重金属分布特征及生态风险评价

矿山开采及冶炼所产生的废渣是矿区土壤重金属污染的主要因素。为了准确掌握遵义锰矿区土地的污染程度,以表观污染程度作为标准,分别采集土壤样品进行分析测试,采用地累积指数法及生态危害指数法分别评价不同区域的污染程度及生态危害程度。研究结果表明:遵义锰矿区农用地土壤中As、Cd、Cr、Cu、Hg、Mn、Ni、Pb、Zn等9种元素背景值略高于贵州全省背景值,除Mn元素外,其他元素未发现明显聚集现象,而矿渣堆、尾矿库附近土壤中存在重金属元素聚集,且Mn、Cd存在明显聚集;地累积指数评价结果:农用地土壤样品中极少量的As、Cd达中度至重度污染程度,矿渣堆、尾矿库附近土壤20%样品Cd达到了中度至重度污染水平;生态危害指数评价结果为农用地中主要由于Cd、Hg、As元素残留导致生态环境风险,风险等级为较强风险;废渣堆、尾矿库附近土壤则主要由于Cd、Hg元素残留导致生态环境风险,风险等级为极强风险。

遵义长沟锰矿安全评价指标体系构建及应用

针对锰矿开采过程中存在的安全隐患,以遵义长沟锰矿为例,基于AHP-FAHP综合评价法,综合考虑工作场所安全、作业设备安全、人员安全等3大类因素,建立了合理的、科学的遵义长沟锰矿安全影响因素结构图,得到了体系中各种影响因素的权重及影响因素评价指标占比。进一步根据模糊数学、最大隶属度理论,建立模糊综合评判模型,进行分析和计算得到各因素的组合权重,从而得到最终的评判向量,为遵义长沟锰矿安全评价指标体系提供一定理论依据。

贵州遵义转龙庙锰矿床构造特征分析

黔北遵义地区在燕山早、晚期构造作用下,区内发育了较典型的隔档式褶皱,同时在褶皱轴部因挤压变形发育了同向的小型逆断层。正是这些褶皱和逆断层的存在,对转龙庙锰矿层的影响较大,因此,研究其构造特征对该地区下一步深部找矿有一定的指导意义。

露天矿山残余资源量开拓运输方案研究——以遵义市播州区鸭溪顺发采石场为例

为合理开采贵州优势矿产资源之一的砂石矿,打造新的一个千亿级产业,目前贵州省推进建设了多个大中型矿山,已投的多个中小型露天砂石矿存在较多残余资源量,对该类型矿山开拓设计有一定的广泛性和必要性。基于此,本文以遵义市播州区鸭溪顺发采石场为例,在分析采矿现状的基础,针对3类运输方案进行了优选,认为“溜槽+公路开拓”方案更适合于鸭溪顺发采石场的运输环境,并布置了合理开拓方案。

Sedimentary Features and Paleogeographic Evolution of the Middle Permian Trough Basin in Zunyi,Guizhou,South China

Based on detailed field surveys,numerous sections and drillcores as well as analyses of lithofacies and sedimentary facies,sedimentary differentiation in the Middle Permian Zunyi(northern Guizhou,South China)trough basin was studied in detail.Caused by activities of the Emeishan mantle plume,the regional extensional setting and the extinguishing of carbonate production factories were shown from Guizhou to Yunnan.Three types of sedimentary enironments were developed in the study area:platform,slope,and basin.In this work,we established a sedimentary model for the study area,identified 14 syndepositional faults,and created the detailed reconstruction of the trough basin via a sedimentological investigation.It is found that the paleogeographic evolution of the study area can be divided into six stages:(1)a pre-rifting stage,(2)rapid rifting and subsidence,(3)stable rifting and subsidence,(4)the second stage of rifting and subsidence,(5)silicification,and(6)regional uplift and denudation.The sedimentary features and paleogeographic evolution of the Maokou Formation in Zunyi show that the platform,slope,and basin sedimentary features coexisted.In addition,the extensional setting and extinguishing of carbonate production factories were important preconditions for the evolution of the platform region in the study area,and the activity of syndepositional faults also played an important role in the paleogeographic evolution of this area.

Great Paleozoic-Mesozoic Biotic Turnings and Paleontological Education in China: A Tribute to the Achievements of Professor Zunyi Yang

Professor Zunyi Yang is a pioneer paleontologist who established the earliest Paleontological education and research in China, and has contributed his lifetime to promotion of Chinese paleontological education and researches as well as the studies on the Permian-Triassic （P-Tr） mass extinction and its possible causes. Yang has studied six fossil clades and trace fossils, together with his colleagues, he has established 6 new species of cephalopods, 1 new genus and 15 new species of gastropods, 8 new genera and 31 new species of bivalves, 17 new genera and 66 new species of brachiopods, 1 new genus and 4 new species of ophiuroids, 2 new genera and 7 new species of triopsids （Crustacea）, and 3 new ichnogenera and 7 new ichnospeeies of trace fossils. Yang led the 2nd IGCP working on the P-Tr mass extinction in the world. His group＇s excellent works on basic stratigraphy and paleontology enable the GSSP of P-~r boundary （PTB） to be ratified in China. Yang＇s earlier works on three-episode extinction pattern and volcanism-causing extinction hypothesis are also highlighted here to show how their first-hand data and initiative hypothesis have influenced the current and ongoing debates on the P-Tr crisis and possible causation. Yang school＇s extinction pattern is reviewed here, and their 2nd phase of extinction is marked by a dramatic loss in biodiversity, pointing to a widely accepted mass extinction. The 3rd extinction is characterized by ecological collapse of ecosystem structures and disappearance of the PTB microbialite ecosystem, while the 1st extinction （also prelude extinction） is indicated by the collapses of deep-water and reef ecosystems. Updated studies show that the volcanic ashes near the PTB originated from silicic, subduction-related igneous activity with little or no basaltic input. This subduction zone activity is related to closure of the Paleo-Tethys Ocean, and the intensity and frequency of the volcanic activity appear to increase near the P-Tr extinction interval. Hg anomalies （Hg/TOC ratios and Hg isotopes） were also detected from the P-Tr extinction interval, and they are interpreted as the results of enhanced volcanic-generated atmospheric mercury, which was injected by the violate eruption of the Siberian traps. Thus, the peak felsic volcanism is coeval with violate eruption of Siberian traps, and the coupled relationship between both types of volcanisms and biotic extinction suggests a causal relationship.

Alumina Project Financing In Place In Zunyi

On September 21,2018,Export-Import Bank of China officially grant the first loan of RMB200 million to Chinalco Zunyi Company,marking the successful implementation of the alumina project financing in Zunyi.

International Students’ Visit to Zunyi with Rainbow Bridge Project

Zunyi in the eyes of international students'Study Abroad in China:Findings and Thoughts',a project based on the Golden Key Project,was carried out in May and June.Fourteen students from foreign countries were invited to visit poor rural areas covered by the CPAFFC’s Rainbow Bridge Project,which is designed to give international businesses a link to rural China.