Early Cretaceous Metasomatized Lithospheric Mantle beneath the Central Jiangnan Orogen in South China:Geochemical and Sr-Nd Isotope Evidence from the Tuanshanbei Dolerite

It is well established that Cretaceous magmatism in the South China Block(SCB)is related to the Paleo-Pacific subduction.However,the starting time and the associated deep crust-mantle processes are still debatable.Mafic dike swarms carry important information on the deep earth(including mantle)geodynamics and geochemical evolution.In the Jiangnan Orogen(South China).there is no information on whether the Mesozoic magmatic activities in this region are also directly related to the Pacific subduction or not.In this study,we present detailed zircon U-Pb geochronological,wholerock element and Sr-Nd isotope data for Early Cretaceous Tuanshanbei dolerite dikes,and provide new constraints on the condition of the lithospheric mantle and mantle dynamics of the SCB during that time.LA-ICP-MS zircon U-Pb dating suggests that this dolerite erupted in the Early Cretaceous(~145 Ma).All samples have alkaline geochemical affinities with K_(2)O+Na_(2)O=3.11-4.04 wt%,K_(2)O/Na_(2)O=0.50-0.72,and Mg^(#)=62.24-65.13.They are enriched in LILE but depleted in HFSE with higher initial^(87)Sr/^(86)Sr ratio(0.706896-0.714743)and lower ε_(Nd)(t)(-2.61 to-1.67).They have high Nb/U,Nb/La,La/Sm and Rb/Sr,and low La/Nb,La/Ta,Ce/Pb,Ba/Rb,Tb/Yb and Gd/Yb ratios.Such geochemical signatures suggest that the fractional crystallization is obvious but crustal contamination play a negligible role during magmatic evolution.Tuanshanbei dolerite were most likely derived from low-degree(2%-5%)partial melting of a phlogopite-bearing mantle material consisted of~85% spinel peridotite and~15% garnet peridotite previously metasomatized by asthenospherederived fluids/melts with minor subduction-derived fluids/melts.Slab-rollback generally lead to the upwelling of the hot asthenosphere.The upwelling of asthenosphere consuming the lithospheric mantle by thermo-mechanical-chemical erosion.The lithospheric mantle may have partially melted due to the heating by the upwelling asthenosphere and lithospheric extension.It is inferred that the Tuanshanbei dolerite might be associated with the initial slab rollback and corresponding lithospheric extension occurred potentially at ca.145 Ma.

Detrital Zircon Records of the Banxi Group in the Western Jiangnan Orogen:Implications for Crustal Evolution of the South China Craton

The Neoproterozoic evolution of the Jiangnan Orogen is important for understanding the tectonic history of South China.As a volcanic-sedimentary sequence developed in the Nanhua rift,the Banxi Group preserves the records of important magmatic and tectonic events linked to the assembly and breakup of the Rodinia supercontinent.In this study,we report the results from whole-rock major-and trace-element concentrations,with zircon LA-(MC)-ICP-MS U-Pb ages,trace elements and Lu-Hf isotopic compositions of sandstones from the Banxi Group.The rocks are characterized by high SiO_(2)(65.88%–82.76%,with an average of 75.50%)contents,moderate(Fe_(2)O_(3)^(T)+MgO)(1.81%–7.78%,mean:3.79%)and TiO_(2)(0.39%–0.54%,mean:0.48%),low K_(2)O/Na_(2)O(0.03–0.40,mean:0.10)ratios and low Al_2O_(3)/SiO_(2)(0.11–0.24,mean:0.15)ratios.The sandstones have highΣREE contents(mean:179.1 ppm),with chondrite-normalized REE patterns similar to the upper crust and PAAS,showing enriched LREE((La/Yb)_N mean:14.85),sub-horizontal HREE curves and mild Eu(Eu/Eu^(*):0.75–0.89,mean:0.81)negative anomalies.Their geochemical characteristics resemble those of passive continental margin sandstones.Most of the zircons are magmatic in origin and yield a U-Pb age distribution with three peaks:a major age peak at 805 Ma and two subordinate age peaks at 1990 Ma and 2470 Ma,implying three major magmatic sources.The Neoproterozoic zircons haveε_(Hf)(t)values ranging from-47.4 to 12.4(mostly-20 to 0),suggesting a mixture of some juvenile arc-derived material and middle Paleoproterozoic heterogeneous crustal sources.The Hf model ages of middle Paleoproterozoic zircons(~1990 Ma)with negativeε_(Hf)(t)values(-12.65 to-6.21,Ave.=-9.8)concentrated around the Meso-Paleoarchean(mean T_(DM)^(C)=3.3–3.1 Ga).For late Neoarchean detrital zircons(~2470 Ma),ε_(Hf)(t)values are divided into two groups,one with negative values(-9.16 to-0.6)with model ages of 3.5–2.9 Ga,the other featuring positive values(1.0 to 3.9)with model ages of 2.9–2.7 Ga,recording a crustal growth event at~2.5 Ga.Neoproterozoic zircons show volcanic arc affinities with partly intraplate magmatic features.We propose that the Banxi Group formed in a rift basin within a passive continental margin setting,which derived detritus from felsic to intermediate rocks from the Yangtze Block and a small amount of arc volcanic rocks.The middle Paleoproterozoic detrital zircon data suggest Columbia-aged basement lies beneath the western Jiangnan orogen.

Intra-continental Orogeny:Insights from Magnetotelluric Data into the Mesozoic Uplift History of the Eastern Jiangnan Orogen in South China

Despite extensive efforts to understand the tectonic evolution of the Jiangnan Orogen in South China,the orogenic process and its mechanism remain a matter of dispute.Previous geodynamic studies have mostly focused on collisional orogeny,which is commonly invoked to explain the Jiangnan Orogen.However,it is difficult for such hypotheses to reconcile all the geological and geophysical data,especially the absence of ultrahigh-pressure metamorphic rocks.Based on the magnetotelluric data,we present a group of resistivity models produced through the combination of two-dimensional and three-dimensional inversions,revealing the geo-electrical structures of Jiangnan and a typical collisional orogen.In our models,the resistive crust is separated into three parts by a prominent conductive layer with opposite dipping directions on both sides.A special thrust-nappe system,which is different from that developed in a typical collisional process,is revealed in the Jiangnan Orogen.This structure suggests a process different from the simple collisional orogeny.To interpret our observations,an'intra-continental orogeny'is proposed to address the development of the Jiangnan Orogen in the Mesozoic.Furthermore,this'reworked'process may contain at least two stages caused by the decoupling of the lithosphere,which is revealed by an extra conductive layer beneath Jiangnan.

Fe-bearing minerals and implications for gold mineralization for the Wangu deposit in Central Jiangnan Orogen

Hydrothermal alteration with bleaching of host rocks is the most important prospecting indicator for gold deposits in the Jiangnan Orogen Belt.The alteration has been identified as pre-ore carbonate(siderite)-sericitization and the Fe of siderite in the alteration zone is derived from the host rocks rather than fluids.In addition,such alteration decreases in intensity and width with depth and gold mineralization also occur in the non-bleached rocks,casting doubt on the reliability of the prospecting indicator.Detailed petrographic work and SEM analysis on the Wangu deposit indicate that there are two types of siderites,i.e.,Sd1 and Sd2.Among them,Sd1 grains are relatively small and distributed along the planes of unaltered host rocks,while Sd2 grains,only occurring in the altered slates,are commonly larger.Both types of siderites were altered by auriferous fluids,producing porous cores and minerals such as pyrite,quartz,and ankerite.Compared with unaltered parts,the altered parts have lower Fe,but higher U,Pb,and REE.In addition,Sd1 and Sd2 are similar in Mn,Na,V,and Sr concentrations but different in Fe and Mg.The occurrence and geochemical compositions of both siderites indicate that Sd1 could be transformed into Sd2 by pre-mineralization alteration through dissolution-reprecipitation.Chlorite is another important Fe-bearing mineral in the host rocks,and EPMA analysis suggests that it is ripidolite with relatively high Fe contents.Consequently,chlorite can also provide Fe to form the pre-ore carbonate(siderite)-sericitization.Geochemical modeling demonstrates that both ripidolite and siderite can result in sulfidation and therefore gold precipitation.As a result,this study demonstrates that pre-ore alteration with characterized bleaching is not a prerequisite for gold mineralization despite of its prominent features.Due to the presence of Fe-bearing Sd1 and chlorite,gold mineralization could still occur through sulfidation in the unaltered rocks.

江西彭山穹隆构造成因及地质意义

为探讨彭山穹隆成因及时代,在彭山地区开展了野外地质调查、构造解析和年代学等研究工作。结果表明,彭山穹隆为构造穹隆,形态为短轴背斜,其及周边存在稳定的印支期近SN向古构造应力场,伴生NNE向走滑断层,其东侧发育东倾的逆断层。切穿穹隆的断层被霏细斑岩脉贯入,霏细斑岩脉的锆石U-Pb年龄为(123.0±1.0) Ma,隐伏黑云母花岗岩的U-Pb年龄为(123.0±1.4) Ma,古应力场同期断层中断层泥的伊利石K-Ar年龄为(228.1±10.3)~(233.2±6.5) Ma,因此认为彭山穹隆形成时间为印支期或更早。

基于戏曲中叙事创作与身体运动的江南园林空间路径范式

园林与戏曲在叙事创作中以人的身体运动为共同关注点,表现出转换时空的类似叙事效果。对园林实例和戏曲表演的空间路径进行图解对比,得出连续转折、相间错动、闭环聚合和多环相扣4种基础空间路径范式,并在此基础上分析“环径”范式应对不同情境需求时的5种异变方式,进而总结出空间范式的功能特征即折叠扩大空间表达面、模糊空间的方向界限、控制视线焦点的聚散,指出“环径”范式可创新应用于当下园林与戏曲的沉浸式空间设计,为研究园林与戏曲互通的空间路径范式及设计创作提供借鉴。

真实与虚像:探析江南历史园林的当代复建

【目的】20世纪50年代以来,江南各地多有对残损或消失的历史园林的复建,这些园林构成了传统园林在当代延续的一部分。另外,园林的文本化、文人化特征促生了园林历史中兴废演替的一种传统方式,即由文人主导的基于文本的再造。有必要结合这一传统,厘清江南历史园林当代复建的特点与意义。【方法】聚焦当代复建的历史园林,通过对江南地区的案例开展文献与实地调研,剖析并区分复建的动机与策略,进一步分析典型案例的复建方法。【结果】揭示了园林传统、遗产理念、当代文化等多维度的影响,进而探讨了园林风格、园林类型、真实性等方面存在的问题与挑战。【结论】复建园林作为历史真实的虚像,是传统园林文化的重要表征,在复建信息真实以及准确展示的基础上,可以发挥多元的价值。

基于可持续理念的江南园林遗产发展策略体系研究

近年来,随着遗产可持续发展理念为世界文化遗产持续赋能,园林遗产的可持续工作也正在逐步展开。基于此,首先对传统保护与活化理论进行的背景进行探究,对于现状理念的局限性展开剖析,并进一步梳理遗产可持续发展理念,为后续的研究提供支持。其次,以拙政园为主的苏州园林遗产与伦敦城市遗产作为研究对象,从个体遗产与城市整体遗产两个互为补充的不同视角展开,深入挖掘经济、社会、环境、文化等角度遗产可持续发展手段与策略,并进一步在现有可持续理念框架下进行二级划分,总结成为“目标体系—具体策略—支撑体系”的江南园林遗产可持续发展策略体系,为园林遗产的进一步保护与活化提供不同切入视角与可行性建议举措。

皖南姚村A型花岗岩磷灰石特征及其对成岩成矿的指示

磷灰石作为岩浆岩中的常见副矿物,其地球化学特征常被用来指示火成岩的岩浆过程和岩浆属性。中生代A型花岗岩广泛分布于江南造山带东段,其岩石成因和成矿潜力仍有待进一步研究。文章选择江南造山带东段具代表性的皖南姚村A型花岗岩开展磷灰石的地球化学组成研究,为其岩石成因及成矿潜力研究提供新的信息。姚村花岗岩中的磷灰石普遍发育振荡环带,部分表现为均质结构,成分上具有低氯及高氟、稀土、钇、钍含量的特点,指示其为典型的岩浆成因磷灰石。单颗粒磷灰石的稀土、钇和钍等元素含量从核部到边缘呈连续变化,稀土配分模式显示其具有明显的铕负异常,指示岩浆经历过显著的结晶分异作用。磷灰石-熔体的模拟定量计算表明,姚村花岗质岩浆具有高氟和硫、低H_(2)O-Cl和低氧逸度的特征。综合考虑岩浆的物理化学特征与成矿元素行为之间的联系,认为姚村A型花岗岩具有稀有金属成矿潜力。

江南文脉视域下的钟山文化特质研究

江南地区是中华文明的重要发祥地之一,以长三角地区为其主要分布区,江南文化所处的地理环境成就了江南文脉延续的特征。江南名山作为孕育江南文化的重要地理空间形态,也成为江南文脉延续的载体。作为南京母亲山的钟山曾有多个称谓,自魏晋存史,延续至唐时便名列江南名山,不仅具有物质文化特质,也具有非物质文化特质。基于对江南文脉式样的考察,通过对历史文献的考据整理,以钟山名称演变历史的文化背景为基础,建立以“山名+八地”时空分析为路径的历史名山演进技术逻辑,梳理出钟山所蕴含的“八地”文化特质,即山水形胜地、形便分界地、军事要冲地和皇陵禁封地的物质文化特质,八景游赏地、寺院道观地、雅集文兴地和修身隐逸地的非物质文化特质,力图展现江南文脉中名山文化的显性式样与隐性式样,为实现江南文脉的传承创新,构建解读历史名山文化特质的体系模式提供思路借鉴,以期促进江南文脉更好地奔流向前。

明清易代与江南文学版图之重构

在明代至清代康熙前期,苏州无疑是整个江南地区文学创作和活动的中心。明末清初,杭州和常州的文学得到了较大的发展,在康熙中后期以来与苏州形成了鼎立的局面。江南其他地区的文学发展,在明清两朝也各自有着不同程度的变化。江南地区的文学版图在清代得到重构。这一局面的出现与明清易代有着根本的关系。

江南社会史视野中的“农村三部曲”

“农村三部曲”是茅盾将他的江南地域经验和社会政治意识、社会科学理论,以及社会史兴趣进行有机融合的一次重要尝试。“三部曲”集中体现了茅盾对经济生活的高度关注,“眼光向下”的分析路径,以及书写“整体的历史”的追求,纵横捭阖地勾勒出1930年代江南农村和乡镇社会政治、经济、农事、风俗、祭祀、礼仪等多重图景,涉及社会阶层变动、地方权力博弈、底层对统治阶层的反抗等多重政经脉络的演进。作品在贡献出一幅1930年代江南农村和乡镇社会“整体的历史”的缩微图的同时,也打开了现实江南世界的历史纹理和日常褶皱,为现代江南文学的书写和地域文学研究提供了创作手法上的借鉴和研究路径上的启示。

江南的自我:旗营文化空间与三多的身份认同

1650年,杭州城西落成八旗驻防营地,此举将杭州城市空间一分为二,旗人与民人则处于半隔离的社会生活状态。但在杭州旗营建设、毁灭和重建的三个阶段之间,双方始终保持着不同程度的文化交流。随着文化涵化过程的深入、驻防政策的改变及城市创伤记忆的驱动,杭州旗人逐渐发生地方化转化,显现出江南地区的身份认同,并形成了修史编志的自觉意识。正是在此背景下,杭州蒙古旗人三多立志于旗营掌故的整理,并对江南旗人的身份建构展开了思考。三多通过其组诗《柳营谣》,以文学的方式将杭州旗营的历史片段重构为一方文武兼备的文化空间,这不仅是对杭州旗营文化溯源的一次尝试,也体现了其在多元文化的浑融中,凭借特殊的旗人身份和普遍的江南文化所产生的独特的自我意识。值得注意的是,考察三多出任库伦办事大臣前后的文学作品,可以发现三多仍抱持着以“江南”为中心的文化视角审视蒙地风物,呈现出明显的“他者化”的文学叙事,这说明空间转移和文化记忆让三多最根本的身份认同意识回归到了“江南”,可谓近代中国民族交融和文化互动的典型例证。

流动的抄本:明清嘉善《唐氏族谱》的编纂、流传与文本生产

上海图书馆藏《唐氏族谱》抄本两种,最早抄成于乾隆初期,此后历经一个多世纪的修订、增补和重抄、抽换,文献形态复杂凌乱。该族谱的文本层次则更为丰富,其祖源叙事和早期世系可能形成于宋代至明代前期。晚明以来,该族谱以抄本的形态在松江、嘉善一带的多支唐姓人群之间流传、增订、嫁接,在乾隆抄本形成之后仍有新的支系添加进来。因此,这一族谱的生产模式并非人们熟知的在“宗族组织”主持下编纂、续修的模式,族谱背后的唐姓人群也并未形成哪怕是松散的“宗族”。这一类族谱或可命名为“嫁接型族谱”,值得在将来的学术研究中进一步关注和探讨。

江南汽车公司的公私合营改造

工商业在国民经济发展中具有举足轻重的作用。1949年中华人民共和国成立之后,党和国家工作重心开始转向经济恢复与建设,而合理有序地调整工商业则是初期经济工作的核心。中央人民政府全面贯彻“公私兼顾”“劳资两利”的经济建设总方针,基于各省市不同地情、各种经济成分并存局面,地方政府在具体落实执行时采取不同手段灵活地开展调整工作,以发展生产、繁荣经济。江南汽车公司系国民党大官僚张静江于20世纪30年代出资创办的私营企业,亦是解放前南京市最重要的市区公共交通公司之一。由于该公司的特殊性质与发展背景,南京市军管会与人民政府先后采取代管与公私合营的改造方式,使之变成人民的企业,服务于共和国建设事业。

前溪舞蹈的独特内涵和当代价值研究

前溪舞蹈作为具有江南特色的传统艺术形式,其在历史更迭中形成不同的变异发展,呈现出鲜明的艺术风格与深厚的人文底蕴。前溪舞蹈在吴越文化母体中受到江南民俗风情与社会风尚的影响,以典型化姿态呈现出吴地文化品格与地域个性,唤醒了浙江本土族群的集体记忆,构建出江南气质的精神想象共同体。以前溪舞蹈为出发点,在此基础上分析前溪舞蹈中当代江南气派的自觉追求,将为浙江本土化舞蹈艺术形态的当代创新提供现实参照。

“路线分合”:20世纪30年代江南农村的困境与出路

20世纪30年代,在全球大萧条冲击下中国农村陷入破产,向称富庶的江南农村亦未能幸免。农民经济困顿,由此而来的是抢米风潮等一系列社会动乱事件。造成江南农村困境的原因,既有一般性的天灾人祸、苛捐杂税等因素,也有因商业化程度较高而受国际市场冲击较大,以及毗邻政治中心而承担了更多国民政府赋税压力等特殊因素。针对江南农村的困境,社会团体最先做出反应。此后,政府、银行界、学校等纷纷参与,并提出了救济经济、改良技术、提升教育、改造社会等不同进路,当地农村状况亦因此有所改观。国民政府在此过程中努力争夺主导权,并充分整合各方力量,进一步加强了对农村的有效控制。在此运动中,各方既有大量合作,也有诸多分歧,由此出现了对政府的亲疏向背的多样选择。随着危机的进一步加深,各派暂时搁置成见走向联合。但农村问题依然作为一个繁难的社会问题长期绵亘于中国社会变革的深层结构中。

明末清初侨日僧的中国叙事——以日本“唐绘祖”江南禅僧逸然为例

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