Geochemistry of Russian Rivers

小行星9304843 目前，在俄罗斯远东的大河中可以不受限制地进行访问和采样。 两次非常成功的探险分别是对上勒拿河的主要支流阿尔丹河（1991年）和科雷马河（1992年）的探险。 对所有重要支流进行了水化学取样，并对其悬浮物和床层物质进行了取样。 现在可获得的阿尔丹系统的数据清楚地表明，在这种冰缘环境中，冻裂对加速风化的影响。 太古代阿尔丹地盾的风化速率似乎比奥里诺科河流域的热带类似物瓜亚纳地盾至少快一个数量级。 同样，Lena高原台地碳酸盐岩的风化速率也不受低温的抑制。 在夏季流量期间的浓度水平与长江，排水地质相似的地形。 这些比较提供了对地球化学循环的气候恶化的影响，在目前的普遍感兴趣的话题洞察力。 计划将这项工作扩大到上勒拿河的主干以及该地区的其他大河，即印地格里卡河、亚纳河、阿纳迪尔河和阿穆尔河。 ***

9304843 Edmond Unrestricted access and sampling is currently possible in the great rivers of the Russian Far East. Two very successful expeditions have taken place to the Aldan, the major tributary of the Upper Lena (1991), and to the Kolyma (1992). All significant tributaries were sampled for water chemistry and for their suspended and bed material. The data now available for the Aldan system clearly show the effects of frost cracking in accelerating weathering in this periglacial environment. The Archean Aldan Shield appears to weather at rates at least an order of magnitude faster than its Tropical analogue, The Guayana Shield in the Orinoco drainage. Similarily the rates of weathering of the platform carbonates of the Lena Plateau are not inhibited by the low temperatures. Concentration levels during the period of summer flow are comparable to those of the Yangtze, which drains geologically similar terrain. These comparison give insight on the effects of climatic deterioration on the geochemical cycle, a topic of much general interest at the present time. It is planned to extend this work to the main stem of the Upper Lena and to the other large rivers of the region, the Indigrika, Yana, Anadyr and Amur. ***