Utilization and Living Inheritance of Red Tourism Resources in Nanxiong City under the Background of"Baiqianwan Project"

Under the work deployment of"Double Hundred Action",Huizhou Engineering Vocational College,Nanxiong Municipal People's Government and Shaoguan College have formulated a series of plans and projects to promote the local development of Nanxiong through cooperation and in-depth research,which strengthens the role of vocational education in rural revitalization,and promotes the effective use of red tourism resources in Nanxiong City,promoted the development of local tourism and economy,provides new impetus and direction for rural revitalization,and demonstrates the positive prospects and vitality of rural revitalization,as well as the important value and potential of vocational education in rural revitalization.

Climate Suitability Analysis of Tobacco in Nanxiong

Tobacco is a economic pillar in Nanxiong City,and its yield and quality are closely related to climatic conditions.By analyzing the relationship between the growth of tobacco and climatic conditions,and comparing with actual climate in Nanxiong,the best climatic suitability for tobacco planting in Nanxiong was found out.Through comparative analysis between yield,quality of tobacco in recent years and climatic condition in Nanxiong,it was obtained that stable temperature,moderate rainfall and sufficient sunshine were the key meteorological factors to ensure the yield and quality of tobacco,while meteorological disasters such as hail and rainstorm could reduce or even eliminate the yield of tobacco.

First Asian Paleocene pantolambdid pantodont(Mammalia)and its implications to intercontinental faunal exchange

Pantodonta was one of the first groups of eutherians to evolve at the beginning of Cenozoic era,including the largest herbivores at that time.Pantodonta shows considerable diversity during the Paleocene and Eocene,with most of the species having been discovered in Asia and North America.Here,we report on a new pantodont,represented by lower jaws with well-preserved dentition,discovered from the Middle Paleocene Nongshan Formation of the Nanxiong Basin,Guangdong Province,China.Its unique dental and mandibular characteristics distinguish it well from any known Asian pantodont,but are quite consistent with North American taxa,especially Pantolambda and Titanoides.The new specimen is identified as Nanxiongilambda yei gen.et sp.nov.,characterized by the combination of the following morphological features:thick and robust mandible with a conspicuous anteroexternal flange,high positioned condyloid process,posteriorly protruding angular process,robust but not elongated lower canines,double-rooted p1,small but distinct talonids on posterior lower premolars,talonids nearly as wide as trigonids on lower molars,and m3 with a well-developed hypoconulid and a distinct entoconid.The new discovery marks the first record of a pantolambdid pantodont outside of North America,suggesting a broader geographical distribution and intercontinental dispersal of this clade during the Paleocene.Considering the more primitive Pantolambda only found from Torrejonian to early Tiffanian NALMA(equivalent to middle-late Shanghuan to early Nongshanian ALMA),which is slightly earlier than Nanxiongilambda(early Nongshanian ALMA),pantolambdids have likely undergone a particular wave of migration from North America to Asia during the Early-Middle Paleocene.Previous researches have suggested that pantodonts had dispersed only from Asia to North America during the Early Paleocene,but our new specimen indicates the biotic dispersal may have occurred in the opposite direction.The new specimen also contributes to the renewal of the evolutionary history of pantodonts and provides further insights into the migration and dispersal of Paleocene mammals.

Lithology, kinematics and geochronology related to Late Mesozoic basin-mountain evolution in the Nanxiong-Zhuguang area, South China

The Nanxiong red-bed basin and its adjacent Zhuguang granite form a distinctive basin-mountain landform in the Nanling region, South China. Research results suggest that the Zhuguang granite is a polyphase composite pluton developed on the metamorphic basement of the paleo-Tethys-paleo-Asian tectonic regime and possesses geometrical and kinematic features of hot-doming extensional tectonics at the middle-upper crustal level, which is considered as a magmatic complex that resulted from the collision-orogeny during the Indosinian Period, the subduction-consuming during the Early Yanshanian Period and the intra-continental basaltic underplating and deep-seated geodynamics during the Late Yanshanian Period. The Nanxiong basin is a Late Cretaceous-Paleogene asymmetric faulted basin that is characterized by a fault boundary on the northern side and an uncomformable boundary on the southern side, its deposit center was migrated gradually from south to north. Structural kinematic results on the basin-mountain coupled zone demonstrate that the ductile and the brittle rheological layers show a quite coincident sense of shear, implying that it is a continuous process from the ductile extensional deformation followed by locally sinistral strike-slip shear at a middle-crustal level to the brittle tensional deformation at a upper-crustal level during formation of granitic doming extensional tectonics. The Zhuguang granite and the Nanxiong faulted basin constructed a semi-graben tectonic system. Lithological and geochemical results suggest that the Late Triassic to Jurassic granitic bodies in the Zhuguang have some similar features: high SiO2, Al2O3, K2O contents, alkalinity index > 2.8, ANKC value > 1.1, LREE-enriched pattern with high REE contents, marked negative Eu anomalies, enrichment in Rb and Th, depletion in Ba and Nb, showing a K-rich and Al-rich calc-alkaline affinity, which suggest a continuous magmatic evolution from Late Triassic to Jurassic. Formation of Nanxiong basin and evolution of basin-mountain system were controlled both by the Zhuguang granitic-doming and the regional extensional tectonics. Development of the olivine basalt in the basin suggests that tension action was very strong during lava eruption. The magma-type zircon grains of basalt from the Nanxiong basin yielded the SHRIMP age of 96±1Ma, providing reliable geochronological constraint on the tectono-thermal event and basin-mountain evolution in the Nanling region, South China.

6种牧草对广东南雄红壤理化性状的影响

为检测牧草对粤北南雄红壤地种植的耐受性,以山毛豆Tephrosia candida、木豆Cajanus cajan、象草Pennisetum purpureum、菊苣Cichorium intybus、糖蜜草Melinis minutiflora和晚熟狼尾草Pennisetum alopecuroides 6种牧草为试验材料,在广东南雄红壤地试验种植,测定种植一年后土壤的容重、孔隙度、pH、有机质、电导率等土壤指标,分析比较不同牧草对土壤结构变化影响的差异性。结果表明:(1)种植牧草后,土壤的pH值得到不同程度提升,其中菊苣使土壤pH值提升了0.54,电导率较对照组增加了30.1μs/cm;(2)木豆对土壤容重影响最大,降幅达16.3%,而山毛豆和象草更有利于土壤有机质富集;(3)山毛豆、木豆、菊苣和晚熟狼尾草均有效提高了土壤总孔隙度,并且使得非毛管孔隙度占总孔隙度的比例由种植前的25.96%提升至30.17%~43.39%;(4)6种牧草与容重和总孔隙度分别呈显著正相关和极显著负相关,说明土壤结构变化对牧草有影响,同时不同牧草对土壤结构的影响存在差异性。

粤北南雄盆地县域土地利用变化与生境质量演变

南雄位于广东省“一核一带一区”发展格局中的北部生态发展区,是广东省重要生态屏障的组成部分,但由于早期不合理的农耕发展生成了大量的未利用地,对生境质量造成负面影响。基于2000、2005、2010、2015和2020年的土地利用数据,运用InVEST模型,对4个周期(2000—2005年、2005—2010年、2010—2015年、2015—2020年)的生境质量演变特征进行评价,并利用生境质量贡献率探究影响生境质量变化的土地利用转移类型。结果表明:1)2000—2020年南雄市土地利用变化以耕地与林地之间的相互转化以及耕地转化为建设用地为主;2)南雄市生境质量呈现先上升后下降的趋势,中部丘陵生境质量低,西北部以及东南部高山是高生境质量的分布区;3)2000—2020年,耕地向林地转化是研究区生境质量提升的最主要原因,林地向耕地转化以及耕地向建设用地转化是研究区生境质量下降的主要原因。因此,协调林地与耕地、耕地与建设用地之间的转化将会有效缓解南雄市生境质量下降问题。

Evaluation of the four potential Cretaceous-Paleogene (K-Pg) boundaries in the Nanxiong Basin based on evidences from volcanic activity and paleoclimatic evolution

Determining the location of the Cretaceous-Paleogene(K-Pg) boundary in terrestrial strata is highly significant for studying the evolution of terrestrial ecosystems at the end of the Cretaceous(especially the extinction of non-avian dinosaurs). At present, research on terrestrial K-Pg boundaries worldwide is concentrated in the middle and high latitudes, such as North America and Northeast China. Although many studies have also been carried out in the Nanxiong Basin, located at low latitudes(which has become the standard for dividing and comparing the continental K-Pg stratigraphy in China), many researchers have proposed four possible boundaries from different perspectives. Therefore, the exact location remains to be determined. In this study, the total mercury(Hg) content, environmental magnetism, geochemistry, and other parameters for the samples collected near the four boundaries were determined and compared with existing records. Results indicated that: 1) The total Hg content significantly increased in the upper part of the Zhenshui Formation and Pingling part of the Shanghu Formation with sharp fluctuations. As per latest dating results of Deccan Traps, the significantly high Hg value was attributed to the Deccan Traps eruption. Boundary 1 was located in the middle of the Hg anomaly interval, which was consistent with the relationship between the global K-Pg boundary and time of volcanic eruption. 2) The reconstructed paleoclimate evolution curve revealed that the red sediments in the basin recorded the late Maastrichtian warming event(66.2 Ma). Regarding the relationship between the four boundaries and this warming event, only boundary 1 was found to be closest to the real K-Pg boundary of the Nanxiong Basin.

乡村振兴背景下红色文化资源创新开发路径研究——以广东省南雄市为例

乡村振兴战略要求深化农村改革,实现农业农村现代化,红色文化资源作为革命老区的特色资源可以在乡村振兴中发挥其经济与文明价值。以红色文化赋能乡村振兴的重要意义在于通过二者的双向互动为红色文化资源的保护与传承提供有利条件、为乡村振兴提供物质支持以及精神引领。南雄市作为革命老区,当前面临红色文化资源开发内容形式单调、基础设施落后和宣传方法陈旧等困境。该文提出将拓宽红色文化及相关产业内容形式的维度、完善基础设施建设以及创新宣传方法作为南雄市红色资源利用开发的现实路径,助力南雄市红色文化繁荣和红色文旅产业发展,推进乡村振兴。

粤北铀矿控矿断裂活动年代学特征与找矿规律——以南雄断裂带为例

为研究粤北地区铀矿控矿断裂活动特征和控矿规律以指导找矿,以南雄盆地北缘南雄断裂带为研究对象,通过野外地质剖面调查、LA-ICP-MS锆石U-Pb年代学研究和显微构造变形分析,讨论南雄断裂带活动特征和铀矿找矿规律。研究结果表明:南雄盆地北缘南雄断裂带在三叠纪的构造变形特征以韧性变形为主,岩浆期后热液石英脉和长英质脉于晚三叠世交切断裂带内花岗质糜棱岩和糜棱岩化花岗岩,脉体锆石U-Pb加权平均年龄分别为(230.2±1.7)Ma、(228.9±5.8)Ma和(210.0±2.1)Ma;断裂带内发育典型韧性变形显微构造特征,韧性变形运动特征以左行剪切为主,且具有高温变形和中低温变形2个阶段。认为南雄盆地北缘南雄断裂带内210 Ma韧性变形区段不具备铀矿质沉淀的临界转换成矿机理条件,推断125~120 Ma和110~105 Ma韧性变形强烈并叠加同期区域伸展运动、基性岩脉侵入和铀矿化特征的区段可能是铀成矿有利区段。分析结果为进一步提高诸广山南部整装勘查区铀资源量提供了可行的找矿思路和有效的铀矿查证区段。

粤北南雄和灯塔盆地“牛肝土”差异性发育的地质成因

粤北地区牛肝土(红层荒漠化)是南方丘陵山地带所面临最突出的生态问题之一。本文通过遥感解译和地质调查验证的手段,对粤北南雄和灯塔盆地牛肝土的空间分布进行了分析。结果显示:南雄盆地牛肝土主要分布于白垩系—古新统的紫红色泥页岩和粉砂质泥岩中,色调突出、纹理清晰,具典型的“鸡爪沟”特征,其分布密度由盆地中心往两侧递减。灯塔盆地中未发现有明显的牛肝土出露,水土流失现象主要发育于白垩系红层和一套第四系的红色坡积物中。研究认为导致南雄和灯塔盆地中牛肝土和类牛肝土差异发育的地质因素可能与盆地岩性、沉积抬升历史、沉积物源差异以及新构造活动有关。研究结果可为粤北红层盆地中牛肝土的成因和生态修复提供基础资料。

广东省南雄市某钨矿山天然放射性地质环境调查

介绍了广东省南雄市某钨矿山天然放射性地质环境调查工作中具体方法和内容,包括天然γ辐射测量、空气中氡浓度测量、固体和水体样品中天然放射性核素浓度测量等。分析调查结果发现,该钨矿山存在放射性污染问题,并圈定了放射性污染源项重点风险区,提出了增加坑道通风设施并保持动态监控,以及增加放射性污水处理措施等改善意见。

韶关南雄篛过县级森林公园鸟类多样性研究

为掌握韶关南雄篛过县级森林公园鸟类资源现状,并为该公园的鸟类保护管理决策提供科学依据,于2023年3月、5月、10月、11月对该公园鸟类资源进行了4次调查。采用样线法和红外相机技术进行鸟类调查。结果表明:共记录鸟类13目39科88种,其中国家二级重点保护鸟类6种,广东省重点保护鸟类14种;以东洋界和留鸟为主,分别占51.89%和64.37%。夏季鸟类Shannon-wiener指数和Pielou度指数均为最高,春季鸟类Margalef指数最高。林区样线的鸟类物种多样性、均匀度、丰富度均为最高;距离村落最远和最近的样线之间的鸟类群落差异最大。建议森林公园管理部门与科研院所加强合作,结合智能化设备建立完善监测系统,以更好地掌握森林公园鸟类资源现状,为及时调整保护管理政策服务。

Geochemical environmental changes and dinosaur extinction during the Cretaceous-Paleogene (K/T) transition in the Nanxiong Basin, South China: Evidence from dinosaur eggshells

The complex patterns of trace elements including Ir and isotope distributions in the three K/T sections of the Nanxiong Basin prove the existence of two environmental events in the latest Cretaceous and earliest Paleocene. The first geochemical environmental event occurred at about 2 Ma prior to the K/T boundary interval, where the dinosaur diversity was hardly reduced, except that a number of patho-logical eggshells appeared. The second one was larger and occurred just at and near the Creta-ceous-Paleogene (K/T) boundary. The extinction of the dinosaurs spread out within 250 ka with major extinction beginning at the boundary interval. This is even later than their extinction in Montana, North America and in India. The cause of the dinosaur extinction may be the result of a complex multiple events brought about by the coincidence of global environment change marked by multiple Ir and δ 18O anomalies, and environmental poisoning characterized by other trace elements derived from the local source. Successive short- and long-term conditions of geochemically induced environmental stress negatively affected the reproductive process and thus contributed to the extinction of the dinosaurs.

粤北南雄断裂带花岗质糜棱岩锆石SIMS U-Pb年龄及其地质意义

南雄断裂带是诸广山岩体东南边缘一条多期活动的断裂带,与诸广南部矿田铀成矿关系密切。基于系统的野外地质观察、岩相学研究,结合精细的锆石SIMS U-Pb定年,进一步探讨了南雄断裂带的构造活动时代。南雄断裂带糜棱岩中岩浆锆石年龄为239.3±3.1 Ma,代表原岩年龄,与断裂下盘的花岗岩形成年龄一致,表明糜棱岩的原岩为印支期花岗岩;热液锆石年龄为235.2±2.5 Ma,略晚于岩浆结晶年龄,代表早期构造活动年龄。认为南雄断裂带具有多期活动历史,最早的构造活动可追溯到中三叠世早期,早期韧性剪切活动形成糜棱岩带,后期发生多期次脆性构造活动。糜棱岩的形成早于铀成矿,韧性剪切活动与铀成矿无直接关系,但是糜棱岩是铀成矿的有利围岩,尤其是叠加后期构造破碎和流体交代作用的糜棱岩是铀成矿有利部位。

广东省南雄市地质灾害风险性评价

本文以广东省南雄市为研究区,基于近10年全市199个地质灾害点样本数据,选取坡度、坡形、高程、坡向、土层厚度、灾点与距居民区距离等6个静态的基础地质条件影响因子,降雨量强度作为诱发因子,综合考虑承灾体特征及易损性情况,基于灾害系统学原理的风险评估模型,开展风险性评估。对地质灾害风险性的方法与技术的研究,能够为该区的灾害防治和经济建设提供技术参考。

广东南雄盆地晚白垩世主田组沉积特征及古气候分析

华南白垩系陆相红层发育,为认识特殊的白垩纪温室气候在东亚低纬度的陆地响应提供了重要载体。通过野外剖面观测和样品粒度、色度、碳酸钙含量、磁化率、总有机碳含量等实验,对广东南雄盆地中南部的主田剖面主田组进行沉积环境和古气候研究。研究结果表明,主田组由一套细粒碎屑岩组成,其中的古土壤以发育钙质结核、钙板层、遗迹化石等为识别特征。主田组砂岩样品的碎屑颗粒主要为石英,岩屑和长石次之,多为次棱角至次圆状,分选性较好,颗粒支撑结构,胶结物以钙质和铁质为主。其沉积环境主要为泛滥平原沉积,伴有河流沉积。在白垩纪末期(马斯特里赫特期)古气候总体趋于温凉的背景下,主田组的古气候具有从早期到晚期由湿热向干热转变的趋势。

南岭山区红砂岭生态环境修复的遥感监测——以南雄市为例

粤北南岭山区是华南地区重要的生态屏障和水源涵养区。其在南雄市特有的红砂岭地貌,在自然条件和人为活动的影响下生态风险日渐凸显。探索红砂岭生态环境的修复监测,对粤北山区的生态保护有着重要意义。文章结合无人机高分航拍影像,基于U-Net卷积神经网络模型解译生态要素,并参照2017年遥感影像进行历史变化分析,对研究区域的红砂岭地貌生态修复现状进行监测。结果表明:(1)草地是和红砂岭地貌共存的典型生态要素类型,灌乔木的生长条件要求较高,难以在红砂岭地貌近距离生存;(2)当前是研究区的生态修复改造的初期,生态修复的初步成效已经展现。在后续的工作中,需针对砂岭地貌周边植被生长情况,实施综合治理措施。

广东省南雄盆地白垩系—第三系交界恐龙绝灭问题

广东省南雄盆地中的红层可划分为三个群五个组,大致代表了晚白垩世—始新世的沉积.根据绝对年龄、古地磁测定结果和脊椎动物化石组合性质的综合分析,位于地磁极性带 29R 上部的坪岭组和上湖组之间的分界线被确定为 K/T 界线.对晚白垩世恐龙蛋的研究表明,不同"种"的恐龙蛋是在地磁极性带 29R 的中、下部,也就是说在白垩系—第三系交界之前20～30万年期间绝迹的.而且在这一时期内,所有已发现的蛋壳中,绝大多数蛋壳的厚度和显微结构都显示出明显的病理特征,例如根据随机取样统计,Macroolithus yaotunensis 蛋壳异常结构的出现率,最高可达75%.产生病态恐龙蛋壳的生理机制可以根据发生在现生鸟类的相同病理特征来解释.进一步分析恐龙蛋壳的微量元素和稳定同位素组成,结果显示, Pb, Cu, Mn 等9种元素丰度变化在这一时期达到最大峰值, δ^(18)O 也出现正异常.在这一基础上提出,微量元素的污染和气候突然的变化妨碍了正常蛋壳结构的形成,导致了恐龙的绝灭.这一绝灭过程大约经历了20～30万年.

广东南雄白垩系及恐龙蛋到鸟蛋演化研究

首次实测了南雄盆地一条完整的白垩系剖面;沿剖面在66个层位中采集到蛋化石,新建了1个恐龙蛋科,2个属及6个种;在厘定南雄盆地和丹霞盆地的岩石地层后,统一提出了一套白垩纪地层单位名称。另外通过对羽状蛋化石的研究,揭示出恐龙蛋到鸟蛋的进化,是由于蛋壳棱柱层产生了变异,出现了从‘层状结构’到‘羽状结构’的转变;与现代鸟禽类对比后确认,恐龙蛋的棱柱层相当于鸟禽类的鳞片层(带);具有羽状结构的蛋化石是恐龙蛋演化到鸟蛋的一种中间类型。

广东南雄盆地白垩系—古近系界线

在过去的30年中有数支考察队在广东南雄盆地进行了白垩纪和古近纪地层多学科的系统研究。本文综合了南雄盆地近年的岩石地层学、磁性地层学、地球化学、古生物学方面的研究成果和湖北新洲盆地时代相当于浓山组的地层中得到的同位素年龄,认为上湖组时代大体上与Danian期相当,或相当于北美哺乳动物分期Puercan和Torrejo-nian期,其底界接近于白垩系—古近系界线。