U-Pb Age and Hf Isotope Study of Detrital Zircons from the Wanzi Supracrustals:Constraints on the Tectonic Setting and Evolution of the Fuping Complex,Trans-North China Orogen

Located in the middle segment of the Trans-North China Orogen, the Fuping Complex is considered as a critical area in understanding the evolution history of the North China Craton （NCC）. The complex is composed of various high-grade and multiply deformed rocks, including gray gneiss, basic granulite, amphibolite, fine-grained gneiss and marble, metamorphosed to upper amphibolite or granulite facies. It can be divided into four rock units： the Fuping TTG gneisses, Longquanguan augen gneisses, Wanzi supracrustals, and Nanying granitic gneisses. U-Pb age and Hf isotope compositions of about 200 detrital zircons from the Wanzi supracrustals of the Fuping Complex have been analyzed. The data on metamorphic zircon rims give ages of 1.82-1.84 Ga, corresponding to the final amalgamation event of the NCC, whereas the data for igneous zircon cores yield two age populations at -2.10 and -2.51 Ga, with some inherited ages scattering between 2.5 and 2.9 Ga. These results suggest that the Wanzi supracrustals were derived from the Fuping TTG gneisses （-2.5 Ga） and the Nanying granitic gneisses （2.0-2.1 Ga） and deposited between 2.10 and 1.84 Ga. All zircons with -2.51 Ga age have positive initial εHf values from ＋1.4 to ＋10.9, suggesting an important crustal growth event at -2.5 Ga through the addition of juvenile materials from the mantle. The Hf isotope data for the detrital zircons further imply that the 2.8 Ga rocks are important components in the lower crust, which is consistent with a suggestion from Nd isotope data for the Eastern Block. The zircons of 2.10 Ga population have initial εHf values of-4.9 to ＋6.1, interpreted as mixing of crustal re-melt with minor juvenile material contribution at 2.1 Ga. These results are distinct from that for the Western Block, supporting that the Fuping Complex was emplaced in a tectonic active environment at the western margin of the Eastern Block.

Petrological Implication of the Albite Rims in the Felsic Gneisses of the Fuping Complex

The albite rim is present in most felsic gneisses of the Fuping Complex. The presence of the rim indicates the coexistence of plagioclase and K-feldspar in the rock. The rim is formed immediately after the myrmekite, and both textures were derived from the alteration of K-feldspar. The difference is that that there is no quartz present in the rim, and the rim is nearly albite and the anorthite content of the rim plagioclase is substantially lower than that of the myrmekite plagioclase. Formed at 400- 500~C the albite rim was derived from the K-feldspar composition adjustment in the late or post- magmatism stage. As the temperature decreased, the equilibrium between K-feldspar and plagioclase could be maintained, and reactions between the minerals occurred. The leucocratic veins in the complex show distinguished magma or migmatitic characteristics. The rim might form in the late magma or deuteric stage. The formation of the rim implies obvious granitic magmaor melt-injection activity. Typical metamorphic rocks cannot produce the rims. Anatexis after medium-high grade metamorphism might be subordinate. If present, the anatexis is water-present, but the rim texture cannot be taken as the symbol of anatexis.

Discovery of Paleogene Sporopollen from the Matrix Strata of the Naij Tal Group-Complex in the Eastern Kunlun Orogenic Belt

The Naij Tai Group-complex is a suite of tectonic-sedimentary méiange aggregation of the Eastern Kunlun orogenic belt, which is composed of two parts, i.e. the exotic blocks of various ages and the matrix strata. On the basis of coral, brachiopod and gastropod fossils found in the exotic blocks, the age of this group-complex was once defined to the Late Ordovician or the Paleozoic. This paper reports for the first time 44 genera and 31 species of Mid-Late Oiigocene sporopoilen in samples from the matrix strata in this group-complex and the Paleogene Quercoidites-Persicarioipollis assemblage is named. The paper aims to provide some detailed evidence for determining the age of the matrix strata in this group-complex based upon a study at the Caiyuanzigou section, which would be of great geological significance for further understanding this group-complex as a suite of tectonic-sedimentary méiange aggregation. The new finding will certainly benefit from now on the investigation of formation and evolution mechanism for the Eastern Kunlun orogenic belt.

Temporal-spatial distribution and ore-forming material source of gold,copper and silver polymetallic ore deposits in the Fuping mantle structure zone

This study was conducted following research on metallogenesis in the Zhangjiajie-Xuanhua and East Hebei mantle branch structure zones. The Fuping mantle branch structure zone is one where Au, Cu and Ag poly-metallic ore resources are concentrated in North Hebei. However, there has existed a long-standing controversy on the temporal-spatial distribution of ore resources and their ore-forming material sources. In terms of age dating and the comprehensive analysis of S, Pb, O, C and Si isotopes, it is considered that the temporal-spatial distribution of ore resources in this mantle branch structure zone is obviously controlled by the Fuping mantle branch structure. In space there is developed such a metallogenic pattern as to be Ag, Pb and Zn polymetallic ore deposits with gold appearing inside and copper appearing outside. Metallogenesis is dated mainly at Yanshanian, the ore-forming materials were derived predominantly from the deep interior of the Earth, and ore-forming fluids were derived largely from Yanshanian magmatism.

Paleoproterozoic crustal evolution of the Hengshan-Wutai—Fuping region,North China Craton

An arguable point regarding the Neoarchean and Paleoproterozoic crustal evolution of the North China Craton（NCC）is whether the tectonic setting in the central belt during the mid-Paleoproterozoic（2.35-2.0 Ga）was dominated by an extensional regime or an oceanic subduction-arc regime.A review of the midPaleoproterozoic magmatism and sedimentation for the Hengshan-Wutai-Fuping region suggests that a back-arc extension regime was dominant in this region.This conclusion is consistent with the observation that the 2.35-2.0 Ga magmatism shows a typical bimodal distribution where the mafic rocks mostly have arc affinities and the acidic rocks mainly comprise highly-fractioned calc-alkaline to alkaline（or A-type）granites,and that this magmatism was coeval with development of extensional basins characteristic of transgressive sequences with volcanic interlayers such as in the Hutuo Group.Although the final amalgamation of the NCC was believed to occur at ～1.85 Ga,recent zircon U-Pb age dating for mica schist in the Wutai Group suggests a collisional event may have occurred at ～1.95 Ga.The metamorphic ages of ～1.85 Ga,obtained mostly from the high-grade rocks using the zircon U-Pb approach,most probably indicate uplifting and cooling of these high-grade terranes.This is because（i）phase modeling suggests that newly-grown zircon grains in highgrade rocks with a melt phase cannot date the age of peak pressure and temperature stages,but the age of melt crystallization in cooling stages;（ii）the metamorphic P-T paths with isobaric cooling under 6-7 kb for the Hengshan and Fuping granulites suggest their prolonged stay in the middle-lower crust;and（iii）the obtained metamorphic age data show a continuous distribution from 1.95 to 1.80 Ga.Thus,an alternative tectonic scenario for the Hengshan-Wutai-Fuping region involves：（i）formation of a proto-NCC at ～2.5 Ga;（ii）back-arc extension during 2.35-2.0 Ga resulting in bimodal magmatism and sedimentation in rifting basins on an Archean basement;（iii）a crustal thickening event in the extended region resulting in a kyanitetype metamorphism at ～1.95 Ga,and（iv） uplifting and cooling of the thickened crust from 1.93 to 1.80 Ga.

REE Geochemistry of Some Metamorphic Rock Types of the Late Archean Fuping Group and Their Anatectic Derivatives in Pingshan,Hebei Province,China─A Preliminary Study

The Late Archean Fuping Group of the Xiaojiao area in Pingshan County, HebeiProvince consists mainly of three metamorphic rock types of supracrustal affinity, i. e., K-feldspar leucoleptite, biotite leptite-gneiss and hornblendic rocks. Their anatectic derivativesformed in the initial stage of anatexis are petrochemically of K-feldspar granitic, trondhjemiticand granodioritic compositions respectively, and in general have inherited the main petrochemi-cal features from their parent rock types. Probably due to the fact that they contain less REE-rich accessory minerals as compared with their parent rocks, the anatectic derivatives are ingeneral lower in ∑REE content. But both the derivatives and their parent rocks have similarREE patterns, which serves as an additional indication of the genetic relationship betweenthem.

太行山区阜平县温泉水化学特征及成因分析

河北省阜平县位于太行山腹地,温泉出露于变质岩地层和变质核杂岩构造区,开展温泉水化学及成因分析,对于变质岩区隆起山地型地热资源的勘查开发具有一定的指导意义。本文基于阜平县自然地理及区域地热地质背景,采用野外调查及采样测试等手段,综合运用水化学及稳定同位素等方法明确了温泉水化学特征和主要离子物质来源,初步推测了温泉的补给来源、深部热源等。阜平县温泉水质总体呈弱碱性,变质岩区温泉水化学类型为SO_(4)^(-)Na型,碳酸盐岩区为HCO_(3)^(-)Ca·Mg型,水化学演化以风化溶解作用为主导,阳离子交换作用为辅。温泉流体中的SO4^(2+)、Na^(+)主要来自硫化物和硅酸盐溶解,HCO_(3)^(2-)、Ca^(2+)、Mg^(2+)主要来自碳酸盐溶解。研究区温泉的补给水源为大气降水,并具有轻微的18O漂移现象,补给高程为1500~2600m,推测补给区位于研究区西北部变质岩区和东北部的碳酸盐岩区;研究区温泉样品均达石英理论平衡溶解线,估算热储温度56.46~133.71℃,循环深度2213.0~8092.3m;研究区温泉热源主要来自深部幔枝构造、低速高导层及构造热,韧性剪切带和深大断裂作为传热通道,地表热显示主要受控于断裂构造。研究区地热资源属于深循环可再生能源,热储温度达中高温标准,可进一步开展深部地热资源的勘查开发工作,促进当地经济绿色可持续发展,助力阜平县乡村建设。

涉农高校科技赋能“土特产”升级发展的实践探索--以西北农林科技大学助推陕西富平柿子产业发展为例

产业振兴是乡村振兴的重中之重,也是实际工作的首要切入点。我国乡村生态类型多样、资源禀赋各异,独具特色和优势的乡土传统产业众多,借助新科技的力量,加快“土特产”升级发展,对促进区域乡村振兴和经济社会高质量发展意义重大。文章以西北农林科技大学科技助推陕西富平柿子产业升级发展为例,介绍了富平柿子产业发展概况,阐述了西北农林科技大学科技助推陕西富平柿子产业升级发展的主要举措与取得的成效,并总结了实践经验,以期为新时期涉农高校和科研院所精准服务区域乡村振兴提供借鉴。

13个李品种在阜平县的引种表现

2021年保定市阜平县引进国峰2号、国峰7号、国峰17号、大红袍、吉胜、03297、红李王、龙园秋李、九三杏梅、红蜜、红运、晚黄、大玫瑰等13个李优新品种进行试栽,对13个李品种在阜平县的物候期、果实外观特性、果实品质和适应性进行调查分析,并结合不同人群的感官评价、科学调查和市场调研,初步筛选出03297、吉胜、大红袍、国峰2号、国峰7号、国峰17号等6个不同熟期、不同类型、满足不同需求的李优新品种(系)。

阜平神仙山岩溶水系统水文地质特征及岩溶水开发利用研究

[研究目的]岩溶水是我国北方城镇的主要水源,通过开展阜平神仙山岩溶水系统水文地质特征研究,为阜平岩溶水合理开发利用提供重要参考。[研究方法]本次主要以阜平神仙山岩溶水系统为研究对象,通过研究岩溶形成的地质背景、岩溶发育特征、含水层结构、地下水循环、岩溶水水化学特征等,系统总结了研究区岩溶水系统的水文地质特征。[研究结果]阜平神仙山岩溶地下水是相对独立的岩溶水系统,岩溶水系统边界主要包括碳酸盐岩与变质岩边界、阻水断裂构造构成的隔水边界和地表地下分水岭边界;岩溶水系统分为蓟县系和长城系白云岩岩溶裂隙含水层和奥陶系-寒武系上统灰岩岩溶裂隙含水层双层结构。阜平神仙山地区大气降水是地下水的主要补给来源,大气降水沿着裂隙入渗补给地下水,以金龙洞大泉(地下河)形式自然排泄,水量5382~75466 m^(3)/d,泉水中锶含量在0.58~1.28 mg/l,达到《饮用天然矿泉水》(GB 8537—2018)界限指标。[结论]阜平神仙山地区岩溶发育,形成了相对独立的岩溶水系统,地下水在其系统内循环。宜在金龙洞地下河附近修建地下挡水建筑物,形成地下岩溶水库,具有可观的开发利用价值。

基于生态系统服务功能价值簇的复合型产业模式设计——以河北省阜平县为例

[目的]基于土地利用多功能特性构建复合型产业模式,为提高山区县的土地利用效率,推进区域生态与经济的高质量发展提供方法和参考。[方法]以太行山中段的阜平县为例,选取水源供给、保持土壤等9类生态系统服务功能作为评判阜平县土地多种功能空间集聚特征的依据,通过空间聚类分析得到不同的功能价值簇,并调整形成生态系统服务主导功能价值分区;在此基础上,叠加土地利用现状、地形地貌和现有产业发展布局,构建复合型产业发展模式。[结果](1)将研究区按生态系统服务功能价值的空间集聚特征分为6种功能价值簇;(2)调整各簇边界,形成维持生物多样性+提供美学景观+保持土壤区、提供美学景观+水源供给+原材料生产区等6类生态系统服务主导功能价值区;(3)在生态系统服务主导功能价值区的基础上,设计出“旅游业+文化产业”“智慧农业+旅游业”等7种复合型产业发展模式,可为实现阜平县乡村振兴与高质量发展提供新的驱动力。[结论]复合型产业模式的设计能够实现生态保护与经济发展的双驱并进,可为解决山区县生态保护与经济发展的矛盾问题提供案例参考。

富平柿饼气候品质评价模型研究

为了助力富平柿饼气候品质评价工作,提升市场竞争力,根据1992—2022年富平气象观测站逐日气象数据、生育期资料和品质检测结果,应用专家决策法、百分位数法和加权求和法,确定关键生育期气象指标的阈值范围和权重系数,建立富平柿饼气候品质评价模型,并对2023年富平柿饼进行气候品质评价。结果表明,尖柿芽体萌动期至展叶期日照时数、平均气温、≥10℃积温、降水量,花期日照时数、平均气温、降水量和果实膨大期日照时数、气温日较差、降水量是影响柿饼气候品质的关键指标。将柿饼气候品质指数划分为特优(≥2.2)、优(1.8~2.2)、良(1.5~1.8)和一般(<1.5),通过典型年验证法发现构建的气候品质模型评价结果与生产实际相吻合,能定量化地反映气象条件对柿饼气候品质的影响。2023年富平柿饼气候品质指数为1.82,等级为“优”。

富平婚育文化词语汇释

婚育文化是与结婚和生育有关的文化习俗,具有系统性、保守性和传承性的特点,是地域文化差异最典型的一个方面。富平传统婚育文化深深植根于当地的民俗与历史文化,独具特色。富平婚育文化通过方言的记录,形成了兼具方言特色和文化特色的方言文化词语。汇释富平婚育文化词语,对于富平方言研究和方言文化研究具有一定价值。

高效液相色谱法在肺结核患者利福平血药浓度监测中的应用

目的:分析高效液相色谱法在肺结核患者利福平血药浓度监测中的效果。方法:选取2021年1月至2022年12月院内肺结核患者100例,均接受利福平用药治疗,采用高效液相色谱法、紫外分光光度法进行血药浓度监测,观察用药后24h内血药浓度变化情况,以用药后5d血药浓度监测结果为标准,分为血药浓度高水平组(>9mg/L)、低水平组(≤9mg/L),对比两组患者炎性因子与免疫功能指标水平。结果:高效液相色谱法测定血药浓度线性范围0.3~30μg/mL,结合线性回归方程分析,血浆内药物在此范围,血药浓度与峰面积线性关系良好(r=0.9941);高效液相色谱法中1例患者由于血药浓度过低未检出,总检出率为99.00%,紫外分光光度法中8例患者未检出,总检出率为92.00%,且高效液相色谱法平均分析时间较短(P<0.05)。入组时,两组间炎性因子水平无统计学差异,用药后4个月,血药浓度高水平组IL-6、IL-8、CRP、TNF-α水平均较低(P<0.05)。结论:高效液相色谱法监测利福平血药浓度有效率较高且所需时间短,此外,肺结核患者利福平血药浓度可影响抗炎效果。

乡村振兴战略下陕西省电商助农实施路径研究——以富平县柿饼为例

近年来,随着乡村振兴战略不断推进,国家对农业现代化和农村经济发展的关注逐渐提升。电商助农作为一种新兴的农产品销售模式,在提升农村经济、增加农民收入及推动农业现代化方面起到了显著作用。文章以陕西省富平县柿饼为例,探讨了电商助农的具体实施路径。通过分析富平县柿饼的产业现状和电商发展情况,提出了提高品牌认知度、加强产品创新及完善物流售后服务等优化建议,以期为其他地区的特色农产品电商助农项目提供参考。

河北平山小觉地区阜平岩群中三种岩类深熔现象的岩相学特征

深熔作用(Anatexis)引起了地壳内部固体物质的重溶与熔融和进一步的初始花岗质岩浆的形成。本文主要从岩相学角度对河北平山阜平岩群3种主要变质岩类中一部分岩石在薄片中所显示的初期深熔特征进行了报道,提出识别深熔作用发生发展初期的一些岩相学标志,为相应的理论探讨提供岩相学方面的依据。区域变质岩石初始深熔的共同特征之一是不同矿物粒度都较相应的同类变质岩石为粗。由于经历粒间流体作用的重溶、溶蚀乃至再度晶出的过程,长英质岩石中长石、石英等矿物改变为具有弯曲、波纹状外形的缝合线结构,而“铰链状结构”的形成则是两微斜长石颗粒之间出现钠交代的结果。深熔作用过程中微斜长石显示出不均匀的光性特征,形成具交代成因的条纹长石细脉和条痕;斜长石出现不规则长方形和补丁状的微斜长石反条纹长石,显示“糟化”或绢云母化,或存在不同程度的“暗化”区域,也可转变成为纤维状至细柱状夕线石,沿斜长石中的一些细小裂纹和遭受应变的解理还出现几乎不透明的物质,它们可能原由深熔作用所形成,可称之为“网格状结构”;黑云母可部分地发生分解,在适当的温压条件下则完全分解,形成原可能为熔体的物质,也可转变成为纤维状至细柱状夕线石;角闪石存在一定程度的“暗化”,并形成与斜长石中所见类似的“

阜平杂岩中几种不同类型片麻岩的锆石激光探针等离子体质谱年代学研究

利用激光探针等离子体质谱方法研究了阜平杂岩中几种不同类型片麻岩中的锆石样品。实验结果显示，对于较简单的锆石群，其２０７Ｐｂ－２０６Ｐｂ数据分布的峰值年龄给出与常规锆石铅的ＴＩＭＳ方法一致的结果；通过分析大量的锆石颗粒，可以弥补ＴＩＭＳ方法分析数据较少的缺陷，从而给出更全面的年龄分布特征。对于具有多期混合的锆石，以及具有继承铅、多期增生历史的锆石，通过对一个样品中多个颗粒的分析以及对单个颗粒的不同位置的分析，可区分出不同期次地质事件的信息，从而为阜平杂岩的形成、变质演化历史提供了年代学依据。研究结果为阜平杂岩中大量发育的灰片麻岩给出约２．５Ｇａ的岩浆活动年龄信息，出露面积较小的角闪斜长片麻岩给出了约２．７Ｇａ的年龄信息，同时还给出了约２．２Ｇａ和约１．

河北小觉地区阜平岩群斜长角闪岩及深熔产物的稀土和Nd同位素地球化学研究

工作中重点对河北平山小觉地区阜平岩群两类角闪质岩石深熔作用的地球化学进行了研究。一类为厚层状斜长角闪岩 ,相邻新生浅色体常量元素组成上向TTG花岗质岩石方向转化 ,稀土和高场强元素含量明显降低 ,轻重稀土分离程度增高 ,tDM减小 ,εNd(t0 )增大。另一类为与黑云变粒岩 片麻岩互层的条带状、石香肠状斜长角闪岩 ,相邻新生浅色体与之存在不同的地球化学关系 :①稀土总量相对增高 ,轻重稀土分离程度有所降低 ;②稀土总量和轻重稀土分离程度都有明显增高。后者Nd同位素组成与斜长角闪岩也存在很大区别。这些现象可用熔融母岩。

陕西富平地区中奥陶统等深流沉积的特征及其地质意义

陕西富平赵老峪地区中奥陶统赵老峪组发育一套与深水碳酸盐岩重力流沉积、放射虫硅质岩、火山凝灰岩伴生的等深流沉积。根据岩性特征可以将该等深流沉积划分为砾屑等深积岩、砂屑等深积岩、粉屑等深积岩和灰泥等深积岩4种类型,识别出较完整的、由单一灰泥或粉屑或砂屑等深积岩叠置组成的4种等深积岩层序。等深流的流向从东北向西南方向,说明中奥陶世富平地区可能是秦岭北侧弧后盆地伸进浅水台地的一个北东向的深海前槽。富平赵老峪地区下奥陶统马家沟组和华北地块其他地区一样都发育浅水台地相碳酸盐岩,中奥陶统突变为深水斜坡-盆地边缘相的碳酸盐岩重力流及等深流沉积,而同期华北地块主体隆升为陆,反映了在扬子板块向华北板块俯冲的背景下,秦岭北侧早古生代弧后盆地北测的陷落下沉作用。

河北平山小觉地区阜平群变质作用和深熔作用同位素年代研究的初步报道

河北平山小觉地区早前寒武纪阜平群的部分岩石,在经历了区域变质高峰之后,又遭受了差异性深熔作用的改造。笔者采用单颗粒锆石U-Pb稀释法测年技术,对变质岩及深熔作用改造形成的岩石,进行了同位素年代研究。认为不一致线上交点数值即为相应岩石所经受的变质作用或深熔作用的年龄。测定结果说明小觉及其以东地区三种岩石所经历的区域变质作用的年龄,不小于2.55±0.04 Ga,小觉附近深熔岩石(花岗闪长质岩石)的深熔年龄为2.47±0.09Ga。因而变质作用和深熔作用都可划归阜平期。小觉西南下康家峪两块标本的测定结果,提供了该地区阜平群岩石在2.06～2.08 Ga经历了古元古代时期重熔作用改造的信息。