白马雪山冰川槽谷发育的形态特征及其影响因素探讨

白马雪山地处横断山脉腹地,对于重建西南季风影响区的环境变迁以及探讨冰川作用特点具有重要科学意义。这里保留着典型的晚第四纪冰川侵蚀地貌,其中冰川槽谷发育特征明显。本文运用抛物线形态参数、梯级宽深比、形态比率等定量分析冰川槽谷的研究方法,对保存在白马雪山主峰扎拉雀尼(5429m)东北坡的两条简单冰川槽谷的形态特征进行分析。采用7个典型剖面的形态特征参数与其他地区对比,探讨冰川槽谷发育的可能影响因素如水热条件、冰川性质、冰川规模、岩性特点、冰川作用时间等。结果显示: 白马雪山冰川槽谷抛物线形态参数b值为1.779,明显小于冰川性质相同的螺髻山(1.835),主要是由于区域降水条件的不同所造成的差异,而与冰川性质不同天山乌鲁木齐河源区(1.825)冰川槽谷的形态特征的差异,可能与冰川规模、作用时间以及岩性条件密切相关; 梯级宽深比中槽谷形态参数沿程变化可以反映冰川流动过程中的动力变化,梯级宽深比中的形态参数Af和Bf值最大处对应的谷肩位置接近雪线位置。根据槽谷谷肩的位置确定末次冰期早期/中期的雪线高度为4140m,这与用地貌法如冰斗底部高程法、侧碛堤最大高度法和冰川末端至冰斗后壁最大高度法等综合确定的雪线高度4092m基本一致。因此,在冰川槽谷发育的冰川作用区,用槽谷谷肩的海拔高度估算雪线高度可以成为一种比较可靠的确定古雪线方法; 白马雪山的冰川槽谷形态参数b-FR的特征表明,即使是海洋性冰川作用区也不符合Hiran和Aniya提出的山地冰川模式,但运用b-FR相关关系可以很好的反映冰川的侵蚀过程。白马雪山地区冰川侧蚀作用导致槽谷坡降值较小,底部较平坦宽阔,呈现出相对完整的U型形态。此外,用形态比率FR值也可以验证雪线的位置高度。     

Cretaceous volcanic belts and the evolution of the Black Sea Basin

Deposits in southwestern Crimea that contain Late Albian, Middle Senomanian, and Middle Campanian volcanic material are described and dated. Supposedly volcanic edifices are identified in the Black Sea (the Shatsky Swell) based on seismic data. The Albian, Senomanian, and Campanian volcanic belts are reconstructed for the entire Black Sea Region. The suggestion is made that the Black Sea Basin formed as a back-arc basin that started from rifting in the Albian and finished with spreading of the oceanic crust in the Senomanian-Early Santonian.     

福建某高速公路隧道强风化花岗岩的旁压试验

旁压试验广泛应用于岩土工程土体参数测试中。根据旁压试验原理与方法,将其运用于福建某高速公路遂道强风化花岗岩原位测试中。试验结果表明:强风化花岗岩强度参数与表层粘性土相当。对于相同性质的岩土层来说,土层的强度指标随深度的增加呈规律性增强。场区内强风化花岗岩具有较高的抵抗水平向变形能力,但其竖向承载能力相对较低。与部分钻孔原位标贯试验成果对比,两种原位测试结果具很好的相关性。     

Integrated Geophysical Works on the Kozlovka Anomaly (Kaluga Region)

This work presents integrated geophysical studies that were carried out to identify the nature of the intense magnetic anomaly detected by the results of land surveying on the right bank of the Slushka River in the territory of the Yukhnovskii district of Kaluga Region. The comprehensive interpretation of the geophysical data and the laboratory measurements of the core made it possible to determine the nature and parameters of the anomaly-forming object that is located in the upper part of the section; it consists of loams that contain such magnetic minerals as greigite, pyrrhotite, and magnetite.     

Ages of Lueliang Group and Its Metamorphism in Mt.Lueliang Region,Shanxi Province：Evidence form Single Grain Zircon U—Pb Dating

Presented in this paper are the newly obtained grain zircon U-Pb ages of volcanic rocks of the Lueliang Goup and associated Kuanping granitic migmatitic gneiss in Shanxi Province.The zircon U-Pb ages of bimodal volcanic rocks(basalt and rhyolite)of the Upper Lueliang Group indicate that the rocks erupted at about 2100 Ma.So the Lueliang Group was formed during the Early Proterozoic.In the area studied the second-stage metamorphism experienced by the Lueliang Group is the dominant one which took place at about 1806 Ma.i.e.,during the late Early Proterozoic.     

夏季不同天气背景和灌溉条件下绿洲地表辐射和能量平衡特征

利用2005年"绿洲系统能量和水分循环过程"野外观测实验(JTEX)资料,分析了夏季不同天气背景下的金塔绿洲小气候特征、辐射和能量平衡特征的日变化规律.结果表明:不同天气和土壤湿度背景下的辐射和能量平衡特征有较大差异.观测中发现有较大的能量不平衡差额,晴天时的能量亏损大于阴天的.     

北祁连西段柳沟峡铁（铜）矿田牙形刺的发现及其地质意义

笔者依据北祁连山西段柳沟峡铁铜矿田原定长城系朱龙关群含铁（铜）矿火山沉积宕系中新发现的牙形刺化石Ｐｈａｋｅｌｏｄｕｓｏｆｆｅｎｕｉｓ（Ｍｕｌｌｅｒ）Ｐｒｏａｃｏｎｔｉｏｄｕｓ；（∈２－３、∈３）和青白口系大柳沟群碳酸盐岩中新发现的Ｔｒｉｐｏｄｕｓ？Ｓｐ（Ｏ１），并与青海郭密寺地区中寒武统黑茨沟群中所发现的牙形刺化石（∈３－Ｏ１）属种相类似而论，认为上述原定地层还有可能重新厘定为寒武一奥陶系和奥陶系。这一发现为研究和恢复北祁连西段区域构造格架及区域构造演化历史提供了早古生代化石依据，对查明铁（铜）矿等的形成环境、总结成矿规律、扩大找矿效果具有较深远的意义。     

Yixunite and Damiaoite—A Twin of New Native Alloys of Indium and Platinum from the Yanshan Mountains

Yixunite and damiaoite Were found in a cobalt- and copper-bearing platinum ore vein of a contact metasomatic deposit. The chief ore minerals are bornite, chalcopyrite, magnetite and carrollite. The platinum minerals include moncheite, sperrylite, daomanite, cobalt malanite and cooperite. Yixunite and damiaoite occur as immiscible globules, 1.0 to 2.0 mm in diameter. Yixunite is always in the central part of a globule. It is opaque with metallic lustre, bright white colour and black streak. HM = 5.8; VHN50 = 634 kg/mm2 (573-681 kg/ mm2); insoluble in HCl, HNO3, HF or H3PO4; no cleavage; no magnetism. Density is hard to measure because of small grain size. Calculated density = 18.21 g/cm3. Reflective colour is bright white with a yellowish tint. Isotropic. The mean analytical results (ranges) (%) are: Pt 82.8 (81.8-83.6), In 16.4(15.6-17.1) and total 99.2. The empirical formula (based on 4 atoms) is Pt2.993 In1.007 . The five strongest lines of X-ray diffraction (hkl, d,I) are 111, 2.30 (100); 200, 1.99 (