The tectonic uplift of the Hua Shan in the Cenozoic

Six granite samples were collected from six difference elevation locations at the Hua Shan in a main ridge of the Qinling Mountain. Apatite and zircon separated from these six samples were dated by the fission track technique. An assessment of the Cenozoic uplift or exhumation rate was obtained from the altitude difference of sampling samples dated by fission track, and from the difference of fission track dates of both apatite and zircon for a sample. The preliminary results suggest that the beginning of uplift of the Hua Shan was as early as 68.2 MaBP and the uplift rates for different periods are 0.02–0.19 mm/a (from the elevation difference) or 0.12–0.16 mm/a (from two mineral fission track dates). The average uplift rate is 0.12 mm/a (from the elevation difference) or 0.14 mm/a (from two mineral fission track dates). The uplift of the Hua Shan might accelerate since (17.8±2.0) MaBP, and the average uplift rate is about 0.19 mm/a.     

论当代绘画艺术的价值取向 ——市场经济对现代绘画艺术的影响

绘画艺术走到今天,在不暇思索中被置于一个新历史语境,开始了自身的重构。艺术进入市场,艺术品汇入流通渠道,已成为上世纪90年代以来中国艺术发展的显著特征。艺术家“经济人”化,“新生代”绘画为市场所接受,昔日从事政治波谱的艺术家成为“金钱”的追逐者……但中国文化的包容性将决定中国当代绘画艺术必将有别于外来艺术而存在的有本土特色和市场的艺术形式。     

Critical events in the evolutionary history of calcareous Nannoplankton

Calcareous nannofossil diversity, and rates of speciation and extinction are calculated for five million year intervals from their first appearance in the Late Triassic through to the Present Day. Important evolutionary events are as follows: first appearance in the Late Triassic, Triassic‐Jurassic boundary extinctions, Tithonian radiation (and the first occurrence of nannofossil carbonates), Late Cretaceous diversity maximum, Cretaceous‐Tertiary boundary extinctions, Palaeocene radiation, mid Eocene to Oligocene diversity decline, and early Miocene diversity rise. These events are related to possible causal factors of which climate appears to be the most fundamental. Other factors may include biogeographical isolation, sea level change, and the configuration of Mesozoic oceans.     

“中间代”或“中生代”：诗人自我意识的一种方式

对“中间代”或“中生代”的命名现象，其实只是这些诗人们“自我意识”的一种表现方式。他们对1990年代与1980年代的诗学差异尤为敏感，同时也就有对共同性的忽视，这导致了他们对自我存在的焦虑，并进而试图通过对自我命名的方式“标新立异”。然而“中间代”或“中生代”并不能构成一个独立于“第三代诗人”或“新生代”的“代”，他们应属于“新生代”的一部分或一种写作倾向，或者应称为“新生代后期诗人”。     

Changes in the Abundance and Diversity of Proteaceae in South‐western Australia: a Review of an Integrated Palaeoenvironmental Study

South‐western Australia is a globally significant hotspot of Proteaceae diversity. This review reports on changes in the abundance and diversity of Proteaceae in south‐western Australia. Using palynology, the data were obtained from three sediment sequences from the Eocene, Pliocene and Holocene, as well as a modern pollen rain study, in the context of a vegetation history framework. The total percentages of Proteaceae pollen in pollen counts indicate that the number of Proteaceae in the vegetation are highest at present, slightly lower, yet still high in the Eocene, reduced by the Pliocene and lowest in the Holocene. It was found that Proteaceous genera can contribute up to 50% of the total modern pollen rain. Sediment from Lake Lefroy showed Nothofagus‐dominated rainforest occurred in the Middle to Late Eocene. Proteaceae species were at least as diverse as today, contributing up to a maximum of 42% of the total pollen rain, and varying across small lateral distances. A laminated Pliocene age sequence from Yallalie confirmed other studies that south‐western Australia was covered by a rich vegetation mosaic consisting of heath and wet rainforest elements. Proteaceae species were a consistent component of the counts, although diversity and abundance (maximum 5%) were low. A Holocene record from Two Mile Lake, near the Stirling Range, recorded little environmental change. Proteaceae species were noted in low abundance, at a maximum of 3.5% of the total pollen count. It is likely that both changing pollination mechanisms and changes in associated vegetation are important in determining the dispersal of Proteaceous pollen.     

南海北部新生代的构造运动特征

新生代以来,南海北部陆架陆坡区及其邻区的地壳构造运动是在统一的区域构造应力场和总体区域性张裂沉降背景之下发生的,构造运动具有多旋回振荡式发生的特点,并贯穿了晚白垩世末之后的整个新生代.它的发生与太平洋板块的构造运动密切相关,这是由于太平洋板块之下的软流层流动方向和强度的振荡式改变而引发的.     

云贵高原晚新生代孢粉植物群与环境变迁

本文依据２０多个剖面（钻孔）近７００个样品的孢粉资料及古地磁极性年表建立了云贵高原４Ｍａ以来的孢粉时间序列，并划分了四个区域孢粉组合带，１７个孢粉组合亚带。依据孢粉混杂堆积的出现，认为云贵高原的上升始于２．８ＭａＢ．Ｐ．，加剧于０．８ＭａＢ．Ｐ．前后。前期地形相对高度＜１０００ｍ，后期相对高度达１５００ｍ；地貌经历了开阔盆地－低洼盆地－山地湖盆－高山湖盆的演化。气候经历了古季风、现代季风的发展过程