浙江江郎山丹霞地貌发育的年代与成因

article revealed the uplift age of red-bed basin to be 77.89±2.6 MaBP (K2) I.e. Late Cretaceous, and it is the first chronological datum of Danxia landform research in China.     

天目山姚砂岭地区第四纪沉积环境研究

根据对天目山姚砂岭剖面样品的分析得出下述结论：１．粒度参数和ＣＭ图象反映该处沉积物Ｃ值均在０Φ以上，多属于滚动悬浮搬运，应属于洪积和冲积相。２．Ｆｅ＾３＋／Ｆｅ＾２＋测定表明，该区和第四纪期间最低年均气温并未低于０℃，因此不具备冰川发育的条件。３．该剖面样品氧化物有以ＡＬ２Ｏ３和Ｆｅ２Ｏ３为主的富铝铁化现象，表明本区第四纪主要经历了温暖湿润的化学风环境。４．重矿和扫描电镜分析发现，锆石具有气、液包     

浙江江山市江郎山岩石岩性特征及其对丹霞地貌形成的影响

岩性特征的量化研究对分析丹霞地貌的成因具重要意义。江郎山岩石岩性标本的X射线荧光光谱分析和偏光显微镜鉴定发现,江郎山方岩组砂岩、砾岩中SiO2含量高达55.5%-75.8%,火山岩碎屑含量高,石英晶屑多已被高温熔蚀,三爿石中多处贯穿有辉绿岩和橄榄玄武岩的岩脉和岩墙,其辉绿-间粒结构和斜长石与暗色矿物的组合,构成了抗风化能力强的岩体,使三爿石得以长期保存。洞穴岩石CaO含量百分比的平均值是崖壁的三倍,且洞穴中岩石的胶结物多为方解石,其含量超过总胶结物的50%以上,使岩石结构的稳定性受到影响,会发生类似石灰岩地区的溶蚀作用,从而导致岩体的破碎和崩塌,有可能形成诸如会仙岩、天宫洞等大型洞穴和凹槽。     

深切怀念地貌与第四纪地质科学家杨怀仁教授

编辑按杨怀仁先生是我国著名的地貌学与第四纪地质学家,在地貌与第四纪科学研究、教学和人才培养方面做出了杰出贡献.前不久,杨先生因病逝世.<第四纪研究>特刊载南京大学地理与海洋科学学院杨达源教授等撰写的纪念短文,以表达学界对先生的缅怀之情.     

湖北旧石器至战国时期(1.15MaBP-278BC)古文化遗址分布与环境演变(英文)

A total of 1362 archaeological sites from the Paleolithic Age to the Warring States time in Hubei Province increase gradually from west to east and from high land to low land.The number of Paleolithic sites with altitude of 50-500 m account for 78% of the whole,while 71%-95% of sites from the Neolithic Age to the Warring States time mainly distribute at the areas of 0-200 m.The temporal-spatial distribution of archeological sites in this area is affected by two factors.For one thing,the human beings of every period need to choose the first or the second terrace as living sites which are near water source and are easy to withstand flood.Additionally,affecting by the regional tectonic uplift since the Holocene,down cutting of rivers can form new river valley,and lateral erosion and accumulation of river in stable time of tectonic movement can result in increasing of many new terraces.So,the human beings migrated to adapt to the change of terrace location,leading to the sites increase gradually in the lower areas of the central and eastern parts of this province.For other things,the temporal-spatial distribution of archeological sites in this area is affected by the climate condition.The Paleolithic sites mostly distribute in the Hanshui River Valley in northeastern Shiyan,southeast of Jinzhou and east of Jinmen,which is because rivers distributed in higher areas in this period.During the Chengbeixi Culture period,the sites are rare in the quondam Paleolithic sites distribution area,but increase obviously along the Yangtze River near the southwest Yichang.The spore-pollen record of Dajiuhu Basin indicates that only 23 Chengbeixi cultural sites may be related to more precipitation and flood during the Holocene wet and hot period.The Daxi Culture,Qujialing Culture and Shijiahe Culture are corresponding to middle and top of the Dajiuhu spore-pollen Zone Ⅳ,during which the climate is in order as a whole and is propitious to agricultural development.In the Qujialing Culture period,32 of original 34 Daxi cultural sites disappeared,while 90 sites increase abruptly in the higher highlands in the north of Xiangfan-Jinmen-Xiaogan,which may respect with enlarging of water areas.The Chu Culture period is corresponding to Dajiuhu spore-pollen Zone V,which is in warm and dry Holocene phase,but it seems that the climate condition is still propitious to agricultural cultivation and the number of archeological sites increase heavily to 593.In addition,there are the least archaeological sites in the lake areas of southeast Hubei Province because of low-lying topography with altitude of 0-50 m and the severest flood.     

对全球变化背景下长三角地区城镇化发展科学问题的思考

城镇化是中国现代化必由之路和实现经济可持续发展的长期国策。在全球变化背景下,如何科学评估并预测气候变化对城镇化发展的影响,阐释快速城镇化进程中应对气候变化的响应机制和适应模式,进而提出适应全球变化的城镇化可持续发展策略,是中国城镇化发展亟待解决的科学问题。长三角位于中国地势第三级阶梯的海岸带,海陆交互作用显著,是全球变化和人类活动剧烈相互作用的典型区域。长三角地区的城市化气候效应最强,水旱灾害、地面沉降、海面上升、极端气候事件对长三角城镇化发展的影响目前尚未作深入研究,气候变化和人类活动相互作用制约长三角的发展,长三角地区的城镇格局将如何应对气候变化和环境污染的影响?对该问题的回答是中国城镇化发展必须解决的难题,将直接决定中国城镇化可持续发展事业的成败。因此,开展长三角城镇化发展对全球变化的响应和适应对策研究,可为国家制定快速城镇化策略应对气候变化提供理论方法和科学决策依据。     

湖北辽瓦店遗址地层中多元素指标对古人类活动的记录

用ICP—AES和XRF方法测试了湖北辽瓦店遗址T0709地层中对人类活动有指示意义的元素含量,恢复了夏代以来遗址地层记录的人类活动特征：（1）夏代文化层（250～325cm）时期是整个剖面的最湿热阶段,人类活动对自然环境干扰相对有限,生态系统良好。（2）东周文化层下段（205～250cm）仍是相对湿热的环境,磁化率大幅上升,人类活动的强度加大。其中220cm处的K、Mn、Sr、Ba含量骤降,说明该层段可能因自然灾害等原因曾被废弃。而在205cm处地层中8种元素的含量快速升高,表明在下东周文化层中期人类活动异常频繁。东周文化层上段（120～205cm）气候变冷、风化作用减弱,Pb含量的异常和Cu含量高值暗示遗址有青铜器制造活动的遗迹。（3）明清文化层（70～120cm）时期气候干冷。本期地层中除Cu含量无显著变化外,Ba、Ca、P、Pb、Sr、Mn、K均有高值层位,而且本层位磁化率较高,这表明该时期人类活动的繁荣。同时,本层中含有陶片和瓷片以及较高的Pb含量,说明遗址在明清时期曾有瓷器作坊的历史;而Cu含量的低值则表明青铜器的制造和使用已丧失了原有的地位。