甘肃酒西白垩纪盆地沉积构成及盆地演化动力学分析

甘肃酒西白垩纪盆地是酒西含油气盆地的一个单型盆地,发育了冲积扇、水下重力流扇、扇三角洲、湖泊、河流沉积体系,并在湖盆演化的不同阶段分别形成冲积扇-扇三角洲-滨浅湖-砾质辫状河、近岸水下重力流扇-中深湖-扇三角洲、扇三角洲-中浅湖-河流沉积体系组合型式.依据等时界面,湖盆充填序列可划分为三个构造层序,相对应于初始裂陷、扩张裂陷-热衰减沉降、湖盆萎缩关闭三个演化阶段.研究证明,地幔热柱的形成和衰减、燕山运动等远程应力作用控制盆地的演化。     

施甸地震震害分析

综合震区102个居民点的震害调查资料，描述2001年4月10日、12日施甸5.2级和5.9级地震列度分布和各烈度区的震害特征，统计分析了在指数与地震烈度的关系，讨论了震害与场地条件的关系。     

建筑物震害及其抗震设计的初步研究--以姚安6.5级地震震区建筑物破坏为例

对2000年1月15日姚安6．5级地震极震区（Ⅷ度）及姚安、大姚、南华和牟定等县城内的建筑物与结构物的震害做了系统的调研。本作为系列研究之二，分析了各类建筑物的地震破坏现象与相关设计，以及地震的破坏机理，讨论了地震区城镇建设中防震减灾应引起重视的有关问题；提出了在设计与施工中出现的若干问题及在这次地震灾害中获取的经验与教训。对今后多震区的城市规划、建筑物设计有一定的参考价值。     

Geochemistry and Petrogenesis of the Tongshankou and Yinzu Adakitic Intrusive Rocks and the Associated Porphyry Copper-Molybdenum Mineralization in Southeast Hubei, East China

Abstract. The late Jurassic Tongshankou and Yinzu plutons in southeast Hubei have been investigated for their contrasting metal mineralization features. The former is closely associated with porphyry Cu‐Mo mineralization, while the latter is barren of metal mineralization, althouth both are located very close to each other. The Tongshankou granodiorite porphyries and the Yinzu granodiorites are geochemically similar to adakites, e.g., high Al₂O₃ and Sr contents and La/Yb and Sr/Y ratios, enriched in Na₂O, depleted in Y and Yb, very weak Eu anomalies and positive Sr anomalies. However, different geochemi‐cal characteristics exist between the two plutons: the Tongshankou adakitic rocks (1) are relatively enriched in SiO₂, K₂O, MgO, Cr, Ni, and Sr and depleted in Y and Yb; (2) have higher degree REE differentiation; (3) have positive Eu anomalies in contrast with very weak negative or unclear Eu anomalies in the Yinzu rocks; and (4) isotopically have relatively higher eP_Nd(t) values (‐5.19 to ‐5.38) and lower initial ⁸⁷Sr/⁸⁶Sr ratios (0.7060 to 0.7062), while the Yinzu adakitic rocks have relatively lower eP_Nd(t) values (‐7.22 to ‐8.67) and higher initial ⁸⁷Sr/⁸⁶Sr ratios (0.7065 to 0.7074). The trace element and isotopic data demonstrate that the Tongshankou adakitic rocks were most probably originated from partial melting of delaminated lower crust with garnet being the main residual mineral whereas little or no plagioclase in the source. On the contrary, the Yinzu adakitic rocks were likely derived from partial melting of thickened lower crust, with residual garnet and a small quantity of plagioclase and hornblende in the source. Interactions between the adakitic magmas and mantle peridotites possibly took place during the ascent of the Tongshankou adakitic magmas through the mantle, considering that MgO, Cr, and Ni contents and eP_Nd(t) values of the adakitic magmas were possibly elevated and initial ⁸⁷Sr/⁸⁶Sr ratios were possibly lowered due to the contamination of mantle peridotites. In addition, the Fe₂O₃ of the adakitic magmas was likely released into the mantle and the oxygen fugacities (?_o2) of the latter were obviously possibly raised, which made metallic sulfide in the mantle oxidized and the chalcophile elements such as Cu were incorporated into the adakitic magmas. The ascent of the adakitic magmas enriched in Cu and Mo will lead to the formation of porphyry Cu‐Mo deposit. Nevertheless, the Yinzu adakitic magmas were possibly lack of metallogenetic materials due to not interacting with mantle peridotite, and thus unfavorable to metal mineralization.     

龙岩地区东部盖层下找煤前景初探

龙岩地区东部盖层下主要发育滑覆、推覆两种构造，探讨了这两种构造的控煤作用，根据控煤构造的展布规律，对该区自东向西划分了三个控煤类型区，并分别提出了各类型区内的找煤方向。     

陕西省蓝田县将军岔金多金属矿地质特征

蓝田将军岔金多金属矿受地层、断裂带控制。矿种数量较多，探明储量较大。矿体赋存于熊耳群细碧角斑岩系中，与构造蚀变带产状基本一致，呈脉状、透镜状。     

Migration through resolution cell compensation in ISAR imaging

Range-Doppler (RD) processing is widely used in conventional inverse synthetic aperture radar (ISAR) imaging. The unwanted translational motion of moving targets is compensated by envelope alignment and autofocus. For existing ISAR imaging algorithms, the scatterers' migration through resolution cells (MTRC) caused by the rotational motion is usually ignored. With the improvement of resolution or the increase of target size, MTRC cannot be neglected. In this letter, the keystone formatting algorithm developed in SAR is used for the MTRC compensation in ISAR. Before the keystone formatting, coherent processing must be performed on the raw phase history data. An effective approach is proposed for this kind of coherent processing. Numerical examples are provided to demonstrate the performance of the proposed approach.     

Alkaline syenites in eastern Cathaysia (South China): link to Permian–Triassic transtension

Two alkaline syenite plutons, the Tieshan and Yangfang plutons, have recently been recognized within NE-trending fault zones in eastern Cathaysia, South China. The rocks are very enriched in K₂O (6.28–9.39 wt.%), rare earth elements (REE; particularly light REE) and large ion lithophile elements, but are relatively low in high field strength elements. Isotopically, they are characterized by high initial ⁸⁷Sr/⁸⁶Sr (0.7093 to 0.7123) and low _Nd(t) values (−5.64 to −10.63). The geochemical data suggest that the alkaline syenites most likely formed via fractional crystallization of enriched mantle-derived magmas. Sensitive High-Resolution Ion Microprobe zircon U–Pb dating indicates that these two intrusions have Late Permian (254±4 Ma) and Early Triassic (242±4 Ma) crystallization ages, respectively. Our data suggest that a tectonic regime dominated by transtension probably existed from at least the latest Permian into the Triassic and was responsible for the formation of the Tieshan and Yangfang alkaline syenites. When combined with previous paleomagnetic, structural, and sedimentology data, we suggest that the transtension along the NE-trending strike-slip fault zones was related to oblique subduction of the Pacific plate underneath South China.     

临界方程法及其对地层性质的自动化判定

从分析折射波时距曲线入手，确定地层性质突变的临界点，利用通过该点时距曲线的时距方程，建立临界方程和临界方程法，以临界方程计算出的地层临界厚度值与待判层厚度无关，二者比值决定了待判地层性质。     

湖南跑马坪金矿的发现及其地质找矿意义

跑马坪金矿为近年来在岩坝桥岩体外接触带新发现的破碎带蚀变岩型金矿中具代表意义的矿床。这一发现不仅为湘西钨锑金成矿带提供了新的金矿找矿类型和找矿方向，而且也为探讨该矿带的成矿期从宏观上提供了证据。