Crust and Upper Mantle Electrical Resistivity Structure in the Panxi Region of the Eastern Tibetan Plateau and Its Significance

The Panxi region is located in the frontal zone of positive squeezing subduction and side squeezing shearing between the Indian plate and the Eurasian plate. The long-period magnetotelluric （LMT） and broadband magnetotelluric （MT） techniques are both used to study the deep electrical conductivity structure in this region; magnetic and gravity surveys are also performed along the profile. According to the 2-D resistivity model along the Yanyuan-Yongshan profile, a high- conductivity layer （HCL） exists widely in the crust, and a high-resistivity block （HRB） exists widely in the upper mantle in general, as seen by the fact that a large HCL exists from the western Jinpingshan tectonic zone to the eastern Mabian tectonic zone in the crust, while the HRB found in the Panxi tectonic zone is of abnormally high resistivity in that background compared to both sides of Panxi tectonic zone. In addition, the gravity and magnetic field anomalies are of high value. Combined with geological data, the results indicate that there probably exists basic or ultrabasic rock with a large thickness in the lithosphere in the Panxi axial region, which indicates that fracture activity once occurred in the lithosphere. As a result, we can infer that the high-resistivity zone in the Panxi lithosphere is the eruption channel for Permian Emeishan basalt and the accumulation channel for basic and ultrabasic rock. The seismic sources along the profile are counted according to seismic record data. The results indicate that the most violent earthquake sources are located at the binding site of the HRB and the HCL, where the tectonic activity zone is generally acknowledged to be; however, the earthquakes occurring in the HCL are not so violent, which reflects the fact that the HCL is a plastic layer, and the fracture threshold of a plastic layer is low generally, making high stress difficult to accumulate but easy to release in the layer. As a result, a higher number of smaller earthquakes occurred in the HCL at Daliangshan tectonic zone, and violent earthquakes occurred at the binding site of high- and low-resistivity blocks at the Panxi tectonic zone.

Volatile and C-H-O isotopic compositions of giant Fe-Ti-V oxide deposits in the Panxi region and their implications for the sources of volatiles and the origin of Fe-Ti oxide ores

The Panzhihua,Hongge,and Baima Fe-Ti-V oxide deposits in the Panzhihua-Xichang(Panxi) region are hosted in large layered mafic-ultramafic intrusions.The layered intrusions intrude either the Neoproterozoic Dengying Formation,composed mainly of limestone,or the Paleoproterozoic Hekou Formation,composed of meta-sedimentary-volcanic rocks.It remains unclear if the wall rocks have been involved during the fractionation of magmas and have affected the sequence of crystallization of Fe-Ti oxide.Volatiles and their C-H-O isotopic compositions of magnetite,apatite,clinopyroxene,and plagioclase of different types of ores from the three intrusions are analyzed using a technique of stepwise heating mass spectrometer to evaluate the role of wall rocks in the formation of Fe-Ti oxide ores.Volatiles released from magnetite are composed mainly of H 2 O and CO 2,whereas the other minerals are composed mainly of H 2 O,CO 2 and H 2.At 800-1200°C temperature interval,the average 13 C values of CO 2 of all the minerals from the three intrusions range from 7.7‰ to 13.5‰ and the average 18 O CO 2 values from 19.1‰ to 19.5‰,which are scattered in a mixed field with basalt and the two types of wall rocks as end-members,indicating that CO 2 from the wall rocks may have been involved in the magmas from which the three intrusions formed.At 400-800 C temperature interval,both 13 C values(13.7‰ to 17.9‰ on the average) and 18 O values(16.2‰ to 19.2‰ on the average) of CO 2 of all the minerals are lower than those for 800-1200 C temperature interval,and much closer to the values of the wall rocks.Abundant H 2 O released at the 400-800 C temperature interval has relatively low D values ranging from 90‰ to 115‰,also indicating the involvement of fluids from the wall rocks.The average bulk contents of volatiles released from magnetite of the Hongge,Baima,and Panzhihua intrusions are 4891,2996,and 1568 mm 3 STP/g,respectively,much higher than those released from other minerals in total,which are 382,600,and 379 mm 3 STP/g,respectively,indicating that magnetite crystallized from magmas with much more volatiles than other minerals.This can be interpreted as that crystallization of clinopyroxene and plagioclase in the early fractionation of magmas resulted in volatiles such as H 2 O that were eventually enriched in the residual magmas and,at the same time,fluids from the wall rocks may have been involved in the magmas and were trapped in magnetite,which crystallized later than clinopyroxene and plagioclase.

DETERMINATION OF THE THICKNESS OF LITHOSPHERE BY GEOTHERMAL DATA——CASE STUDIES IN PANXI REGION

Ⅰ. DATA1. Terrestrial Heat FlowTo date, 13 reliable heat flow values have been obtained in the Panxi region and were published in Refs. [1, 2]. For use, these data were cited and synthesized in Table 1.

Hydrothermal sedimentation and lead-zinc deposit in Dengying formation of the Sinian system in Panxi region

IN addition to vanadium titano-magnetite, lead-zinc ore is also one of the mineral resources with great exploring potentiality in the Panxi region of Sichuan Province, China. In the carbonate rock strata of theSinian Dengying Formation which account for about 3.5%-11.4% of the total thickness of the strataexposed in the Panxi region there are quite a number of the Pb-Zn deposits that account for 53.4% of thetotal Pb-Zn ore reserve in the whole region. Furthermore, some large Pb-Zn deposits such as the Tianbaoshan Pb-Zn deposit in Huili, the Daliangzi Pb-Zn deposit in Huidong and the Yinchanggou Pb-Zn deposit in Ningnan are also hosted in the Sinian Dengying Formation. Why? Previous studies indicated that the high background values of Pb and Zn, favorable lithofacies andpaleogeographic conditions and good ore-hosting structures made the Sinian Dengying Formation a pre-

川西高原和攀西地区不同级别短时强降水环境参量特征对比分析

利用2010—2021年5—9月川西高原和攀西地区62个国家级自动站逐小时观测资料及时间分辨率为1 h的ERA5再分析资料,对比分析了两区域不同级别短时强降水发生发展过程中水汽、热力和垂直风切变等环境参量特征。结果表明:川西高原和攀西地区短时强降水主要集中在6—8月,午后至前半夜是川西高原短时强降水的高发时段,攀西地区则表现出明显的夜雨特征。就川西高原而言,较好的水汽、热力条件和较强的垂直风切变、上升运动均有利于高级别短时强降水的产生;不同级别短时强降水的CAPE值差异显著,1100 J·kg^(−1)可作为判断是否出现20 mm·h^(−1)以上短时强降水的参考阈值。就攀西地区而言,不同级别短时强降水在暖云层厚度、700 hPa比湿、700 hPa假相当位温、CAPE、0~3 km垂直风切变等环境参量的值域分布上均存在明显差异;当700 hPa比湿大于13 g·kg^(−1)、CPAE值超过1100 J·kg^(−1)、0~3 km垂直风切变达到10 m·s^(−1)时,极易出现50 mm·h^(−1)以上的短时强降水。

Joint Inversion of the 3D P Wave Velocity Structure of the Crust and Upper Mantle under the Southeastern Margin of the Tibetan Plateau Using Regional Earthquake and Teleseismic Data

The special seismic tectonic environment and frequent seismicity in the southeastern margin of the Qinghai-Tibet Plateau show that this area is an ideal location to study the present tectonic movement and background of strong earthquakes in China's Mainland and to predict future strong earthquake risk zones. Studies of the structural environment and physical characteristics of the deep structure in this area are helpful to explore deep dynamic effects and deformation field characteristics, to strengthen our understanding of the roles of anisotropy and tectonic deformation and to study the deep tectonic background of the seismic origin of the block＇s interior. In this paper, the three-dimensional （3D） P-wave velocity structure of the crust and upper mantle under the southeastern margin of the Qinghai-Tibet Plateau is obtained via observational data from 224 permanent seismic stations in the regional digital seismic network of Yunnan and Sichuan Provinces and from 356 mobile China seismic arrays in the southern section of the north-south seismic belt using a joint inversion method of the regional earthquake and teleseismic data. The results indicate that the spatial distribution of the P-wave velocity anomalies in the shallow upper crust is closely related to the surface geological structure, terrain and lithology. Baoxing and Kangding, with their basic volcanic rocks and volcanic clastic rocks, present obvious high-velocity anomalies. The Chengdu Basin shows low-velocity anomalies associated with the Quaternary sediments. The Xichang Mesozoic Basin and the Butuo Basin are characterised by low- velocity anomalies related to very thick sedimentary layers. The upper and middle crust beneath the Chuan-Dian and Songpan-Ganzi Blocks has apparent lateral heterogeneities, including low-velocity zones of different sizes. There is a large range of low-velocity layers in the Songpan-Ganzi Block and the sub-block northwest of Sichuan Province, showing that the middle and lower crust is relatively weak. The Sichuan Basin, which is located in the western margin of the Yangtze platform, shows high-velocity characteristics. The results also reveal that there are continuous low-velocity layer distributions in the middle and lower crust of the Daliangshan Block and that the distribution direction of the low-velocity anomaly is nearly SN, which is consistent with the trend of the Daliangshan fault. The existence of the low-velocity layer in the crust also provides a deep source for the deep dynamic deformation and seismic activity of the Daliangshan Block and its boundary faults. The results of the 3D P-wave velocity structure show that an anomalous distribution of high-density, strong-magnetic and high-wave velocity exists inside the crust in the Panxi region. This is likely related to late Paleozoic mantle plume activity that led to a large number of mafic and ultra-mafic intrusions into the crust. In the crustal doming process, the massive intrusion of mantle-derived material enhanced the mechanical strength of the crustal medium. The P-wave velocity structure also revealed that the upper mantle contains a low-velocity layer at a depth of 80-120 km in the Panxi region. The existence of deep faults in the Panxi region, which provide conditions for transporting mantle thermal material into the crust, is the deep tectonic background for the area＇s strong earthquake activity.

攀西地区5个油橄榄品种细根形态特征及碳氮磷化学计量特征研究

探究油橄榄(Olea europaea)细根形态特征和养分分配格局对油橄榄引种栽培生产具有重要意义。通过对攀西地区5个油橄榄品种的细根直径、比表面积、比根长、组织密度等形态参数和碳(C)、氮(N)、磷(P)化学计量特征研究,探讨细根形态和养分含量在不同油橄榄品种细根根序等级间的差异和与土壤理化性质间的关联。研究结果表明:(1)随着根序等级的增加,细根直径、组织密度呈明显的递增趋势,比表面积、比根长则呈现出明显递减趋势;(2)细根C含量、C:N、C:P随根序的增加而逐渐增大,细根N、P含量基本呈现随着根序的增加而降低,除白橄榄外,细根N:P总体呈现随着根序序级增加而增加的趋势;(3)细根C含量与土壤理化特征指标间均无显著相关性;细根N含量与土壤C、P含量间存在显著正相关(p<0.05),与土壤C:N间存在着极显著的正相关(p<0.01);细根P含量与土壤C、P含量及C:N间存在极显著正相关(p<0.01),与土壤N:P间存在显著负相关(p<0.05);细根C:N与土壤C:N呈显著负相关(p<0.05),细根N:P、C:P与土壤理化特征指标间无显著的相关性。

基于TVDI的攀西地区干旱时空变化特征研究

利用MODIS地表温度数据(LST)和归一化植被指数(NDVI)构建Ts-NDVI特征空间,通过计算温度植被干旱指数(TVDI)详细分析了攀西地区2001—2020年干旱时空变化规律。结果表明:(1)从时间角度来看,20年间攀西地区TVDI年均值介于0.5481~0.5820,以-0.0001·a^(-1)速率缓慢减小,且在2001年和2009年出现大范围中旱。季节性干旱特点表现为冬干春旱,各季TVDI均值分别为冬季0.5618、春季0.6058、夏季0.5590、秋季0.5365,表明冬、春两季较夏、秋两季更容易形成干旱。TVDI月均最大值出现在5月份,为0.6089;最小值出现在9月份,为0.5204;每年2—6月以中旱为主;7月起旱情减轻,转为轻旱;10月起旱情逐渐加重。(2)从空间角度来看,攀西地区旱情变化趋势南北差异明显,南部干旱发生的频率和范围大于北部地区,呈现出中部、南部及西南部高,北部、西北部及东北部低的空间分布特征。(3)从典型干旱年份来看,攀西地区2001年、2006年和2011年春旱耕地在空间分布上具有一定的相似性。其中,受中旱的耕地主要分布在攀西北部和中部;而受重旱的耕地主要集中分布在攀西西南部。研究结果表明,2001—2020年攀西地区旱情稍有缓解,不同季节间干旱差异性较大,干旱范围以攀西中部和南部为主。

森林火损后植物物种多样性特征及空间差异分析

为探析攀西地区火损后人工植被恢复情况及不同立地条件下生物多样性特征及其影响因素,以西昌市泸山为研究对象,运用生物多样性相关理论与方法,分析了泸山火损植被恢复后植物物种多样性特征及其影响因素。结果表明:①泸山区域内植物群落4种物种多样性指数均偏低,不同区域内多样性指数差异较大;②不同坡位之间物种多样性有差异,中坡与上坡、下坡之间植物物种多样性差异明显,而上坡与下坡之间并无明显差异;③研究区域不同方位之间植物群落物种多样性指数存在显著性差异,东、北方向植物多样性指数高于其他区域,西、南部区域植物群落物种多样性指数较低。研究区域内植物群落物种多样性因地形地貌和受损程度不同表现出较大的差异性,根据不同的立地条件采取相应措施来恢复区域生态系统,加强区域内生境间的联系,使研究区域内的生态得以恢复与保护。

攀西林火时空分布格局与气候影响因素的空间异质性研究

基于四川攀西地区2004—2020年防火期林火灾情数据和气象数据,对攀西林火的时间分布特征、空间分布规律、主要气候影响因子分布趋势与格局进行挖掘;利用ArcGIS格网法,结合双变量空间自相关分析方法,探讨气候影响因子对攀西林火发生的影响机制。结果表明:2004—2020年攀西地区林火发生次数随时间发展呈现上升趋势,其中2004—2014年间,火灾次数和过火面积波动增加;2015—2020年火灾次数显著下降,但过火面积呈增加趋势,攀西地区林火主要发生在河谷盆地和丘陵地带,且多集中在丘陵的边缘地带。攀枝花市是林火频发区,凉山州次之。不同级别林火对不同时期气候影响因子的响应存在差异,火险期最高气温、降水、相对湿度及连续无降水日数的相关性显著,而非火险期连续无降水日数和平均风速的相关性较高,各气象要素与林火的逐月滞后相关也存在差异,表明前期气温、降水通过影响地面可燃物进而影响林火发生,持续性的干旱极有可能引发火灾。空间相关显示,林火次数与气温、蒸发、连续无雨日数的高高值主要分布在攀西地区的河谷盆地及丘陵区域,降水、相对湿度与林火的低高值聚集在北部的山原区,平均风速、干旱指数与林火的低高值和低低值聚集在西部山原区,表明攀西地区河谷盆地及丘陵区域的高温干旱使林火呈现聚集效应;而攀西区域南部的山地区,由于海拔较高,人为活动少火源较少,虽然是高温干旱区,也未出现林火聚集效应。

新发展格局下攀西地区康养旅游产业高质量发展的理论逻辑和实现路径

随着人口老龄化和消费结构的升级,以及受新冠肺炎疫情影响,人们对健康、安全和品质的重视度越来越高。“文旅+康养”产业融合已成为旅游行业发展的新机遇和风口,也是区域经济协调、持续、健康发展的重要增长点。攀西地区作为全国康养旅游的发起者和倡导者,在新发展格局下,应立足于满足国内需求,依托优越的自然条件、独特的地域文化和丰富的康养旅游资源,通过协调区域发展、夯实软硬环境、深化产业融合、加大营销推广等路径,深化供给侧结构性改革,促进康养旅游产业高质量发展,助力推进国内旅游经济大循环。

攀西钒钛磁铁矿尾矿中战略性矿产及其综合利用

这是一篇矿物加工工程领域的论文。攀西地区是我国最大的钒钛磁铁矿资源基地,伴随着钒钛磁铁矿的开采和选冶,产生了巨量的尾矿。攀西钒钛磁铁矿尾矿中钒、钛、铁、铜、钴、镍、磷、钪等战略性元素的含量较高,具有潜在的回收价值,但尚未开展系统的选矿回收实验。通过对攀西地区红格矿区尾矿工艺矿物学的研究,拟定了尾矿中战略性元素综合利用技术路线,并开展了系统的选矿回收实验。以浮选选硫—弱磁选铁—强磁浮选选钛—强磁尾矿浮选磷为技术路线,获得了钴品位为0.175%的硫钴精矿、TFe品位56.57%的铁精矿、TiO_(2)品位45.97%的钛精矿、P_(2)O_(5)品位31.73%的磷精矿。研究表明,通过系统的选矿回收实验,能够减少尾矿排放量21.3%,并且,回收这些战略性矿产能获得年产值7134.89万元。因此,回收攀西地区钒钛磁铁矿尾矿的战略性矿产,具有良好的经济效益和社会效益。

攀西民族地区脱贫攻坚与乡村振兴有效衔接的财政政策研究

2020年脱贫攻坚战取得全面胜利后,我国“三农”工作的重心已经迈向全面推进乡村振兴阶段。相对于其他地区,民族地区脱贫攻坚与乡村振兴有效衔接的难度更大,任务更为繁重,需要财政政策在其中发挥更为积极的作用。以攀西民族地区为例,深入分析该地区脱贫攻坚与乡村振兴有效衔接中财政政策的必要性,剖析了目前攀西民族地区通过财政政策支持脱贫攻坚与乡村振兴“有效衔接”面临的困境,总结了制定衔接政策需考虑的关键因素,提出有助于攀西民族地区实现脱贫攻坚与乡村振兴“有效衔接”的具体财政政策建议。

四川省攀西地区中医药健康旅游创新发展模式研究

攀西地区是四川省中医药健康旅游发展的重点区域,为推进攀西地区康养旅游和中医药健康服务的可持续发展,文章在分析我国中医药健康旅游市场发展趋势的基础上,围绕总体发展目标与专业人才供给、中医药健康旅游资源融合开发和旅游接待、收入与细分市场等内容阐释了攀西地区中医药健康旅游发展现状,并从创新协同发展新机制、提供政策发展保障,创新特色产品开发、满足差异化细分市场需求,创新“政产学研用”合作机制、加强专业人才建设等3个层面探讨了攀西地区中医药健康旅游创新发展模式的构建。

攀西地区女性对盆腔炎知信行现状及影响因素研究

目的:调查分析攀西地区女性对盆腔炎知信行现状及其影响因素。方法:采用系统分层随机抽样法对攀西地区部分城乡女性进行问卷调查。结果:共收集有效问卷1736份,单因素分析结果显示,年龄、文化程度、职业、婚姻状况、民族均为攀西地区女性对盆腔炎知信行的影响因素(P<0.05);Logistic回归分析结果显示,文化程度、盆腔炎知识学习意愿是影响认知的主要因素;认知、盆腔炎知识学习意愿和婚姻状况是影响态度的主要因素;认知、态度、年龄、文化程度、婚姻状况、职业是影响行为的主要因素;网络宣传、医生宣传、广播电视、贴画宣传是当地女性较为青睐的宣传途径。结论:攀西地区女性对盆腔炎的认知与态度亟须加强,通过多种多样的形式开展盆腔炎预防、治疗等相关知识宣传工作,可以提高攀西地区女性对盆腔炎的防治意识,促进盆腔炎防治行为的形成。

10个燕麦品种在攀西地区生产性能综合评价

试验旨在筛选适宜攀西地区冬闲田种植的秋播饲用燕麦品种。试验于2021年11月在西昌种植10个燕麦品种,测定燕麦的产量性能及营养品质等指标,并用隶属函数分析法对燕麦品种进行综合评价。结果显示,10个燕麦品种株高为104.88~173.89 cm,太阳神株高最高。各品种燕麦干草产量为12618.94~20470.91 kg/hm^(2),排序为太阳神>牧王>美达>贝勒2>领袖>燕王>爱沃>贝勒>枪手>魅力。各品种燕麦的鲜干比为3.09~5.63,爱沃的鲜干比最大,领袖鲜干比最小。各品种燕麦的粗蛋白含量为4.10%~10.31%,贝勒2的粗蛋白含量最高。各品种燕麦的酸性洗涤纤维含量为25.63%~35.06%,中性洗涤纤维含量为54.01%~64.56%;相对饲喂价值为89.73~118.89,领袖的相对饲喂价值最高,魅力次之,枪手的相对饲喂价值最小。采用隶属函数分析法对燕麦产量和营养品质的7个指标进行综合分析发现,领袖、太阳神和美达综合表现较好。研究表明,领袖、太阳神和美达适宜在攀西地区冬闲田种植,可作为该地区冬闲田主推饲用燕麦品种。

攀西康养旅游竞合发展的驱动要素、模式构建与优化路径

党的二十大报告明确提出积极稳妥推进碳达峰碳中和。双碳目标是我国生态文明建设的重要抓手与经济社会实现全面绿色低碳转型的重要政策指向,现已成为攀西康养旅游产业面临绿色低碳转型的重要价值指引。双碳目标为攀西康养旅游设定了新的发展框架并在一定程度上指引着攀西康养旅游竞合模式创新的基本走向与发展维度。目前,攀西康养旅游相关产业相对较为传统,降碳潜力较大,但因理论研究上、实践发展上、政策行动上存在缺位,与低碳旅游发展的要求有相当的差距,要实现攀西区域康养旅游的“双碳”目标,搭建协同有序的竞合模式,还面临诸多挑战,亟待构建基于“价值共创-目标驱动-主体协同-工具整合-多元互动”的竞合发展新模式。应加大政策供给,夯实低碳康养旅游的制度体系;完善基础设施,构建便捷完善的绿色交通网络;依托资源优势,实现业态融合高质量发展目标;加大技术创新,实施低碳技术创新发展新模式;紧跟市场脉搏,拓展低碳生态宜居康养新空间;拓宽人才供给,健全复合型跨界人才培育机制六个维度为抓手。

攀西地区枇杷低温冻害预防措施与对策

近年来,低温冻害给攀西地区枇杷产业发展带来较大经济损失,针对攀西地区突发的极端大雪天气,研究总结了1套该区域枇杷低温冻害预防措施和对策,通过选址建园、无纺布覆盖、中喷灌溉、喷施防冻剂等措施有效预防冻害,并提供受冻害后的有效补救办法,为攀西地区枇杷产业发展提供技术指导。

攀西地区文体旅康产业一体化融合发展研究

文体旅康产业一体化发展模式是一种独特的发展模式,能够满足游客的多种旅游需求。文章运用文献资料法、实地考察法、多学科交叉研究法等,对攀西地区文体旅康产业一体化发展进行研究,发现攀西地区具有开放包容的多元文化,得天独厚的自然资源,优越的旅游资源和区域领先的医疗条件。同时也存在资源分散、缺乏系统梳理和深度开发,基础设施建设不完善、配套不足,文体旅康产业整体消费不足,服务水平低、行业队伍力量薄弱等4个方面不足。提出加强顶层设计、合理规划布局;增强基础设施建设、改善消费环境、提升消费质量,加强文体旅康服务、壮大行业队伍等对策,以期促进当地文体旅康产业的可持续发展,助力文体旅康产业新格局的形成,丰富旅游业态。

攀西钒钛磁铁矿分布特征及采矿选矿技术

钒钛磁铁矿是攀西地区重要战略矿物资源,钒钛磁铁矿综合利用产业是攀西地区经济的支柱产业。经过多年的努力,攀西地区钒钛磁铁矿的采矿、选矿及冶炼等技术已经比较成熟,形成了比较完整的产业链,有些产品已经进入国际先进行列。但相对比较来看,攀西地区钒钛磁铁矿综合利用技术偏低,特别是共伴生稀贵金属的综合利用技术极为缺乏。为改进和进一步提升攀西地区钒钛磁铁矿综合利用技术水平,对攀西地区钒钛磁铁矿分布特征及采矿选矿技术的现状以及相关的研究成果进行了梳理,分析和探讨了攀西地区钒钛磁铁矿相关综合利用技术不足之处及其发展趋势。