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921.
介绍了两个主要矿集区成矿地质背景、成矿条件,及其典型矿床的研究,总结其成矿规律,建立成矿模式。中国硫铁矿的资源潜力,寄于深部找矿和前寒武纪古老地层的开发,应转移硫铁矿的工作重点于中、西部,扩大找矿线索,开辟新的找矿基地。 相似文献
922.
通过对广饶县土地利用状况进行分析,找出土地利用中存在的建设用地需求量增大、工业项目土地利用率低等问题,并从加强耕地保护工作,拓展发展空间、提供资源保障,加强调控、提升配置效率等方面提出了相应的对策措施。 相似文献
923.
924.
925.
Yan Shuang Xian-Wu Bi Rui-Zhong Hu Jian-Tang Peng Hang Li Da-Hua Li Chang-Sheng Zhu 《Resource Geology》2010,60(1):18-34
The Furong tin deposit in the central Nanling region, South China, consists of three main types of mineralization ores, i.e. skarn-, altered granite- and greisen-type ores, hosted in Carboniferous and Permian strata and Mesozoic granitic intrusions. Calcite is the dominant gangue mineral intergrown with ore bodies in the orefield. We have carried out REE, Mn, Fe, and Mg geochemical and C, and O isotopic studies on calcites to constrain the source and evolution of the ore-forming fluids. The calcites from the Furong deposit exhibit middle negative Eu anomaly (Eu/Eu*= 0.311–0.921), except for one which has an Eu/Eu* of 1.10, with the total REE content of 5.49–133 ppm. The results show that the calcites are characterized by two types of REE distribution patterns: a LREE-enriched pattern and a flat REE pattern. The LREE-enriched pattern of calcites accompanying greisen-type ore and skarn-type ore are similar to those of Qitianling granite. The REE, Mn, Fe, and Mg abundances of calcites exhibit a decreasing tendency from granite rock mass to wall rock, i.e. these abundances of calcites associated with altered granite-type and greisen-type ores are higher than those associated with skarn-type ores. The calcites from primary ores in the Furong deposit show large variation in carbon and oxygen isotopic compositions. The δ13C and δ18O of calcites are −0.4 to −12.7‰ and 2.8 to 16.4‰, respectively, and mainly fall within the range between mantle or magmatic carbon and marine carbonate. The calcites from greisen and altered granite ores in the Furong deposit display a negative correlation in the diagram of δ13C versus δ18O, probably owing to the CO2-degassing of the ore-forming fluids. From the intrusion to wall-rock, the calcites display an increasing tendency with respect to δ13C values. This implies that the carbon isotopic compositions of the ore-bearing fluids have progressively changed from domination by magmatic carbon to sedimentary carbonate carbon. In combination with other geological and geochemical data, we suggest that the ore-forming fluids represent magmatic origin. We believe that the fluids exsolved from fractionation of the granitic magma, accompanying magmatism of the Qitianling granite complex, were involved in the mineralization of the Furong tin polymetallic deposit. 相似文献
926.
Huang Bolin Chen Lide Peng Xuanming Liu Guanning Chen Xiaoting Dong Haogang Lei Tianci 《Landslides》2010,7(1):1-11
In 2007 and 2008, six big damaging rockfalls occurred at four sites in Wu Gorge, the second gorge of the Three Gorges, China.
Detailed surveys and aerial-photographic interpretation identified 104 potentially dangerous rock masses. This paper reviews
previous rock-mass risk ratings, examines dangerous rock-mass structure and presents a new assessment system for rockfall
risk (ASRFR) in the Wu Gorge area. The ASRFR considers 15 factors: seven factors for hazard and eight factors for consequence.
Relative importance weights for these factors are ascertained using an analytic hierarchy process. Using an equation to calculate
the risk, the 104 dangerous rock masses were divided into three risk groups: high risk (33 sites), medium risk (33 sites)
and low risk (38 sites). The ASRFR analysis can be used to divide the shipping route through the Wu Gorge into seven courses
each of one of three classes: safe-route regions, yellow-alarm regions and red-alarm regions. The system provides geological
information and a rockfall-risk management tool for local government and the shipment-route department. 相似文献
927.
江西九江城门山铜多金属矿床土壤轻烃找矿试验 总被引:1,自引:0,他引:1
在开展城门山矿区新一轮的深部外围找矿过程中,传统的化探方法存在一定的局限性。本次工作在城门山矿区内蚀变矿化石英斑岩、矿区外围石英砂岩上方发育的土壤垂直剖面和1线、9线、J0线土壤测线中开展了系统的轻烃测量,尝试利用土壤轻烃异常示踪下伏的矿化信息。研究结果表明,除甲烷(C1)外,土壤轻烃(C2、C3、C4、C5)都能很好地示踪下伏的矿化信息,在花岗闪长斑岩(矿体)上方显示低值区,与土壤Hg气、磁化率高值形成镶嵌结构。通过对硫化物矿体上覆土壤的有机烃组分相关特征和变化规律的分析,可提出预测下伏矿体的评价指标,也有助于了解有机质在成矿作用过程中的赋存状态和演化规律。 相似文献
928.
青海西部祁漫塔格成矿带找矿新进展及其意义 总被引:16,自引:2,他引:14
青海省祁漫塔格成矿带位于东昆仑造山带北西段,带内以往开展了以铁为主的找矿工作,发现一批矽卡岩型中型矿床。近年来带内找矿取得了重大突破:①发现一种新类型矿床——"虎头崖"式层控型大型多金属矿床;②低缓磁异常区多金属和铁矿找矿效果显著,发现四角羊-牛苦头大型多金属矿床,野马泉矿区多金属矿规模达到中型,尕林格矿区发现深部厚大的铁矿体。在系统地综合总结这些成果的基础上,探讨了找矿新进展的意义,划分了3处成矿远景区,并初步讨论了各成矿远景区内进一步找矿的方向。 相似文献
929.
Comparisons of drought variability between central High Asia and monsoonal Asia: Inferred from tree rings 总被引:1,自引:0,他引:1
Keyan Fang Xiaohua Gou Fahu Chen Fen Zhang Yingjun Li Jianfeng Peng 《Frontiers of Earth Science》2010,4(3):277-288
Severe drought is a serious natural disaster that frequently strikes East Asia, highlighting the need to understanding its
drought regime and the associations with Asian monsoon. Tree-ring-based drought reconstructions provide invaluable paleoclimatic
archives for detecting regional and large-scale drought variability and their potential forcings. We herein reviewed many
drought reconstructions from central High Asia and monsoonal Asia and compared their similarities and differences, as well
as their linkages to Asia monsoon. We compared the decadal-scale variability of six drought reconstructions for the central
High Asia, where differing drought variations were found between the western and eastern portions. Seven drought reconstructions
were reviewed for monsoonal Asia, from which a difference in drought variability was observed between the northern and southern
parts. Therefore, we compared the drought variations of the four sub-regions of western and eastern parts of central High
Asia, as well as northern and southern portions of monsoonal Asia. ENSO activity and sea surface temperature of western Pacific
and northern Indian Oceans, coupled with Asian monsoon, play an important role in modulating drought variability of much area
of the East Asia. An improved denser multi-index tree-ring network of longer length for East Asia is necessary for the establishment
of more reliable large-scale drought reconstruction. 相似文献
930.