Physical Landscape in Tachienlu, Kowlon and Litang, Sikang Province.

The region under discussion lies in the eastern border of the Tibetan Plateau. andhas been deeply di(?)sected by the Tatu Ho, Yalung Kiang and their triibutaries. Deep canyons and the flat plateaus form strong contrast in topography. Some native terms have been wisely used, such as, Koaga for glaciated mountains and peaks,“Tang” for bare rock region, “Tsu” for alp pasture, “Kan” for precipitous valley slope, and “Lon” for stream channel.     

Land Utilization in Chengtu Plain, Szechwan

In the north-western part of Szechwan Basin is the famous Chengtu Plain,with an area of 8,000 sq. km. and at 500-700 m. above the sea level. It is a huge alluvial plain formed by cohesion of many alluvial fans, among which the Minking fan is the largest, constituting 2/3 of the area of Chengtu Plain.     

The Paleoproterozoic Copper-Gold Deposit of Gaoua, Burkina Faso: Evidence for A Polyphased Mineralization

Please refer to the attachment(s) for more details     

矿物收藏漫谈（七） 矿物收藏者的秘密

通过前面的介绍,现在我们已经了解要在矿物收藏的天地里畅游所需注意的7个方面的问题。下面要谈谈不同类型的矿物收藏者。     

稀有矿物收藏以补缺为乐

官方已经公布的已知矿物约为4000种，每年另有大概50种得到“新矿物命名及分类委员会”（CNMNC）的认可。该委员会是“国际矿物学协会”（IMA）的几个机构之一。相对于已知的动植物种类的数目而言，已知矿物种类实在不多。已知昆虫种类数目就超过了一百万，就是跳蚤的类别可能都超过了矿物的种类。正因为种类相对较少，‘我们就有可能构建一个包含大部分已知矿物的系列收藏。     

Segmental closure of the Mongol-Okhotsk Ocean: Insight from detrital geochronology in the East Transbaikalia Basin

The Late Paleozoic–Early Mesozoic Mongol-Okhotsk Ocean extended between the Siberian and Amur–North China continents.The timing and modalities of the oceanic closure are widely discussed.It is largely accepted that the ocean closed in a scissor-like manner from southwest to northeast(in modern coordinates),though the timing of this process remains uncertain.Recent studies have shown that both western(West Transbaikalia)and eastern(Dzhagda)parts of the ocean closed almost simultaneously at the Early–Middle Jurassic boundary.However,little information on the key central part of the oceanic suture zone is available.We performed U-Pb(LA-ICP-MS)dating of detrital zircon from wellcharacterized stratigraphic sections of the central part of the Mongol-Okhotsk suture zone.These include the initial marine and final continental sequences of the East Transbaikalia Basin,deposited on the northern Argun-Idemeg terrane basement.We provide new stratigraphic ages for the marine and continental deposits.This revised chronostratigraphy allows assigning an age of~165–155 Ma,to the collisionrelated flexure of the northern Argun-Idemeg terrane and the development of a peripheral foreland basin.This collisional process took place 5 to10 million years later than in the western and eastern parts of the ocean.We demonstrate that the northern Argun-Idemeg terrane was the last block to collide with the Siberian continent,challenging the widely supported scissor-like model of closure of the MongolOkhotsk Ocean.Different segments of the ocean closed independently,depending on the initial shape of the paleo continental margins.     

东亚夏季风次季节变化研究进展

东亚夏季风次季节（10~90 d）变化是中国夏季持续性强降水、高温热浪等高影响天气事件的重要环流载体,处于天气预报上限和气候季节预测下限之间的预报过渡区。研究表明:东亚夏季风次季节变化是东亚夏季风的固有物理特征,它和季节进程之间的时间锁相关系是东亚夏季风次季节变化潜在可预报性的重要来源。东亚夏季风次季节变化与Madden-Julian振荡（MJO）存在显著差异,试图通过MJO来预测东亚夏季风次季节变化的不确定性较大。东亚夏季风次季节预测的另一重要来源是下垫面外强迫,包括欧亚大陆春季积雪、中国东部春季土壤湿度和厄尔尼诺-南方涛动（ENSO）事件。此外,去趋势偏-交叉相关分析统计方法能够分析东亚夏季风多因子和多时间尺度问题。目前,亟需解决的科学问题包括:东亚夏季风次季节模态的客观定量描述、造成东亚夏季风次季节模态年际变化的关键物理过程、不同外强迫因子对东亚夏季风次季节模态的共同影响。