台维斯学术思想的继承与突破     

高抒 《地理研究》1989,8(1):50-56

本文回顾了百年来地貌学思想的发展历史,论述了台维斯理论体系对地貌学的贡献及其现实意义,分析了本世纪四十至六十年代地貌学取得突破性进展的原因、特点和标志。  相似文献   

泡塑吸附痕量钨钼铌钽锑铼研究     

熊昭春  彭振英  周应芬 《河南国土资源》1994,(3)

研究了泡塑在三种介质中对钨、钼、铌、钽、锑、铼的吸附行为。试验表明：介质、络离子类型与性质及其变化决定了泡塑吸附定量、动力学特性及其机理，并由此建立了可供分析实践的几种泡塑吸附体系。  相似文献   

Visit to the museum of the royal college of surgeons: (Red crag mammalian remains.) May 12th, 1877     

G.S. Boulger 《Proceedings of the Geologists' Association. Geologists' Association》1877,5(4):140-142

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Formation and geodynamic implication of the Early Yanshanian granites associated with W–Sn mineralization in the Nanling range,South China: an overview     

Jingya Cao  Jianguo Du  Qianhong Wu  Hua Kong  Huan Li 《International Geology Review》2018,60(11-14):1744-1771

ABSTRACT

The Nanling range (Nanling) is characterized by intense and widespread Mesozoic magmatism related large-scale W–Sn mineralization. A summary of geochemistry, geochronology, and petrogenesis for the W–Sn-bearing granites has been carried out in this study. A series of rock- and ore-forming ages in Nanling indicate that the W–Sn mineralization is closely related to the Early Yanshanian granitic magmatism both in temporal and spatial dimensions (165–150 Ma). Geochemical features show that both of the W- and Sn-bearing granites, which mainly belong to highly fractionated I-type granites with a few A-type granites, are characterized by high contents of SiO₂, Al₂O₃, Na₂O, and K₂O; enrichment in Rb, Th, U, Zr, Hf, and REE; depletion in Sr, Ba, P, and Ti; and high ratios of A/CNK. Furthermore, the different Sr–Nd–Hf isotopic compositions indicate that they are mainly originated from the partial melting of the Precambrian basement rocks of the Cathaysia Block at low oxygen fugacity, and the estimated temperatures for the tungsten-bearing and tin-bearing granites are ca. 700°C and ca. 800°C, respectively. The model of the mantle–crust interaction exhibits that different percentages of mantle-derived magma were likely involved in the generation of the tin-bearing granites and tungsten-bearing granites. In combination with previous studies, we propose that these granites in Nanling were emplaced in an extensional setting, as a response to the break-off and roll-back of the subducted Palaeo-Pacific Plate during 175–150 Ma.  相似文献   

青海省东昆仑洪水河东地区斑岩铜钼矿找矿潜力分析   总被引：2，自引：0，他引：2  

刘江峰  赵双喜  李彦强  刘长财  杨晓刚  陈学俊 《西北地质》2012,45(1):211-221

洪水河东地区岩浆活动强烈,石英闪长斑岩、英云闪长斑岩较发育,岩体、围岩及其接触带绿泥石化、绿帘石化、碳酸盐化、钾长石化、高岭土化、迪开石化、绢云母化和矽卡岩化等蚀变普遍且较强烈,具斑岩型矿化蚀变特征。研究区内Cu、Mo、W化探组合异常分布较多,具备典型的斑岩铜矿床的元素组合特征,岩体含矿性与化探异常吻合,且在研究区盘羊沟、乌腊德地区发现了铜钼矿体。据此分析,认为洪水河东地区具备斑岩铜钼矿成矿地质条件,斑岩型铜钼矿找矿潜力较大。  相似文献   

Geochemical characteristics of Holocene sediments from Chuadanga district,Bangladesh: Implications for weathering,climate, redox conditions,provenance and tectonic setting     

Ismail Hossain  Krisna Kanta Roy  Pradip Kumar Biswas  Mahbubul Alam  Md. Moniruzzaman  Farah Deeba 《中国地球化学学报》2014,33(4):336-350

The present research deals with the geochemical characteristics of the Holocene sediments from Alamdanga area, Chuadanga district, Bangladesh. Main goals of the study are to delineate source rock characteristics, degree of chemical weathering and sorting processes and behavior of redox conditions during deposition of the sediments. Geochemical characteristics of the sediments show comparatively a wide variation in accordance with stratigraphy in their major element contents （e.g. SiO2 69.46-82.13, A1203 2.28-8.88 in wt%）, reflecting the distinctive provenance and in part an unstable period in terms of tectonic activity. Geochemical classification of the sediments shows mostly sub-arkose with few sub-litharenites. Some major and trace elements display comprehensible correlation with A1203 confirming their possible hydraulic fraetionation. The chemical index of alteration （CIA＊）, W＊ index, index of compositional variability （ICV）, plagioclase index of alteration （PIA＊） values and the ratio of SIO2/Al2O3, suggest low degrees of chemical weathering in the source areas as well as immature to moderately mature the sediments. The sediments suggest semi-arid climatic trends within oxic deltaic depositional conditions during the Holocene, at 3-12 ka. Whole rock geochemistry and discrimination diagrams demonstrate the continental signature derivatives, which might have been derived from the felsic to intermediate igneous rocks （granitic plutonic rocks） as well as from quartzose sedimentary/metamorphic provenance. These typical sources are present in a vast region of the Himalayan belt and catchment areas of Ganges. The tectonic setting of the sediments demarcates typically passive margin with slightly continental arc system.  相似文献   

安徽东源钨矿含矿斑岩中的锆石SHRIMP U-Pb年龄及其地质意义   总被引：11，自引：0，他引：11  

秦燕  王登红  吴礼彬  王克友  梅玉萍 《地质学报》2010,84(4):479-484

东源钨矿是皖南地区新发现的大型白钨矿矿床,是该地区目前为止发现的规模最大的钨矿床。东源大型白钨矿的发现实现了皖南地区地质找矿的新突破,为该地区的矿床勘查工作指出了新方向。本文对东源钨矿的地质特征进行了初步的总结和分析,并运用锆石SHRIMP U-Pb法测定了含矿岩体的成岩时间,分析了矿床形成的区域构造背景和控矿因素并初步探讨了矿床成因。研究结果表明,与东源斑岩型钨矿化有关的花岗斑岩的成岩时代为148.6±1.8Ma,为晚侏罗世岩浆侵入活动晚期的产物,并认为燕山晚期的钨多金属成矿作用有可能从华南扩展到长江中下游地区。  相似文献   

新疆东昆仑白干湖钨锡矿床地球化学特征   总被引：4，自引：0，他引：4  

刘子峰  崔雅茹  魏微 《吉林地质》2007,26(4):54-60

本文简单地介绍了新疆白干湖钨锡矿床的地质特征,重点介绍了白干湖钨锡矿床1/10万地球化学特征和1/1万岩屑异常特征,其中包括异常面积、峰值、衬度、异常形态、NAP值、浓度分带等。  相似文献   

渤海W油田复杂低阻油藏含油分布模式及应用          下载免费PDF全文

邓猛  舒晓  金宝强  周军良  何康 《地质找矿论丛》2022,37(3):336-343

近年来，随着渤海油田低阻储层评价及识别技术的不断成熟，在馆陶组陆续发现一批非常规低阻油藏，成为新的储量增长点。由于该类型油藏物性差、束缚水饱和度高、油水分布复杂，开发难度整体较大。认清储层含油分布模式并准确预测高渗、高产甜点已是低阻油藏高效开发的关键。本文基于储层构型分析方法，综合应用岩芯、测井、生产动态等资料，对渤海W油田辫状河低阻储层含油分布主控因素开展研究，实现了辫状河低阻大井距下的储层构型精细描述。研究表明，该区辫状河低阻储层呈差异化含油分布模式，具有沉积微相控制物性、物性决定含油性的规律，其高渗透率心滩坝是油气富集区和高产甜点区。利用此研究成果在心滩坝甜点区先后部署实施7口水平井，均取得较好生产效果。  相似文献   

基于主成分分析和BP神经网络的五道沟水面蒸发计算研究     

陆云燕  王振龙  吕海深  刘竹梅  丁佳楠  黄一博 《水文》2022,42(1):35-39

针为探讨五道沟水面蒸发量与气象因子间的关系,准确估算该地区水面蒸发量,选取五道沟1991—2019年水面蒸发量以及气象因子实测资料,基于主成分法分析水面蒸发量的影响因素,并结合BP人工神经网络算法建立了水面蒸发计算模型.结果表明:主成分分析提取了三个主成分,第一主成分为地表温度、饱和差、绝对湿度、平均气温以及水汽压力差...  相似文献