吉林省通化县羊砬子沟花岗岩饰面石材矿床特征及找矿方向     

张强  高丽英  李立军  李冬梅 《吉林地质》2014,(4)

吉林省通化县羊砬子沟花岗岩饰面石材矿赋存于龙头复式花岗岩体中,矿体石质好、储量大,放射性检测结果远小于国际原子能机构的职业辐射防护安全导则剂量值,因此就γ射线而言是安全的。,是石材开发利用的优质品种。该类型矿体赋存具较强的规律性,同时具有固定层位和区域性,在龙头复式岩体过度相的中粒黑云母花岗岩中开展工作是今后的找矿方向。  相似文献   

鄱阳湖基础地理测量D级GPS网建立方法与探讨     

朱龙元 《测绘与空间地理信息》2014,(9):126-128

首先简单阐明了测区概况和建立该网的基本情况。介绍了在建网过程中选点和埋设点所采用新方法,同时论述和分析了该网数据处理情况和平差后各项指标精度情况。分析了采用等值线图确定GPS正常高的方法精度情况,并与常规方法作比较得出正确结论。  相似文献   

Shaking table study on liquefaction behaviour of different saturated sands reinforced by stone columns     

Hadi Bayati  Mohammad Hossein Bagheripour 《Marine Georesources & Geotechnology》2013,31(7):801-815

Abstract

Liquefaction is a phenomenon developed in loose and saturated layers of sands subjected to dynamic or seismic loading, and often leads to excessive settlement and subsequent failures in structures. Several methods have been proposed to improve soil resistance against liquefaction, among which use of stone columns is one of the most applicable methods. In this research, the effect of stone columns with different geometries and arrangements on the liquefaction behaviour of loose and very loose saturated sands subjected to vibration is investigated using shaking table. Results of the experiments show that when using stone columns in sand layers, the level of maximum settlement is significantly reduced. Further, the presence of stone columns significantly reduces pore water pressure ratio. This further indicates that stone columns have a positive effect and reasonable performance, even in relatively strong earthquakes, provided that the number and cross-section of the columns are sufficient. In addition, stone columns reduce the pore water pressure dissipation time. Moreover, by increasing cross-sectional area and the number of columns, both pore water pressure and settlement decrease. Stone columns in loose sand have a greater effect on the reduction of pore water pressure compared to that of very loose sand.  相似文献   

青田石品种的分类及其鉴别特征研究     

朱选民 《地质科学译丛》2010,(4):17-24,I0001

目前,青田石约有100余品种。X射线粉末衍射和化学成分分析表明,依据其矿物组成,青田石可分为叶蜡石型、地开石型、伊利石型和绢云母型。其中,叶蜡石型又可细分为纯叶蜡石亚型、高Fe叶蜡石亚型、高Al叶蜡石亚型和高Si叶蜡石亚型;按照其产地,青田石可分为＂封门石＂＂周村石＂＂北山石＂＂山炮石＂等。不同产地青田石的鉴别特征与其矿物组成有关。通过脆裂性、＂Fe染现象＂、次要矿物、多型特征、密度等鉴别特征可区分不同的青田石品种。  相似文献   

泥岩、砂岩石方开挖施工工法的创新与研究     

王保国 《地下水》2010,32(5):97-99

通过新疆小山口水电站基础石方开挖工程实践,对当地泥岩和砂岩地质物理特性进行了深入研究,对其石方开挖工法进行了大胆创新,提出了纯机械法施工工法,分别从工程施工质量、进度、安全和成本等多个方面与传统的钻爆法进行比较,结果表明：新施工工法县有技术先进性和经济合理性,可以在今后的施工中使用和椎广。  相似文献   

皖南西递黟县青工艺石材矿地质特征及成因     

翁望飞  罗家元  张帆 《江苏地质》2023,47(3):259-270

“黟县青”是皖南黟县西递特有的一种地方性工艺建筑石材矿，含矿地层为形成于浅海陆架相环境的寒武系大陈岭组，主要产于蓝田向斜盆地内，为受沉积成因控制的大理岩化灰岩矿床，矿体严格受地层产状控制。黟县青石材矿赋矿岩层为深灰色巨厚层纹层状大理岩化微细—细中晶灰岩，因具有高密度、抗风化、抗冻、耐碱、耐水、刚度大于普通灰石、抗变形能力大于混凝土等特性而被广泛应用于徽州地区明清古建筑。燕山期黟县花岗闪长岩体的侵入使灰岩发生大理岩化，对矿石品质的提升起着积极的作用。在矿产勘查的基础上，通过对西递水口亭地区黟县青石材矿成矿地质条件、矿体（矿石）特征和矿床成因的研究，为皖南地区该矿种的勘查、研究和开发利用提供重要的基础资料。  相似文献   

Possible stellar asterisms carved on a protohistoric stone     

Paolo Molaro  Federico Bernardini 《Astronomische Nachrichten》2023,344(10):e20220108

Chisel marks on a stone uncovered in Rupinpiccolo protohistoric hill fort from north-eastern Italy were suggested to be a representation of the night sky (Bernardini et al. 2022 Documenta Praehistorica XLIX). The patterns of the 29 marks are analyzed here to establish if they reproduce popular stellar asterisms. Nine marks are found to match the Tail of Scorpius and five the Orion's Belt, together with Rigel and Betelgeuse. Nine marks are found in the approximate position of the Pleiades showing some match with the cluster members. On the back side, 5 marks possibly reproduce Cassiopeia. One mark slightly North of Orion cannot be identified. The 28 marks show a Pearson correlation coefficient $$(28) with stellar positions higher than 0.99 with a probability $$ of a wrong correlation lower than 0.001. Departures are about one degree, or about 7 mm, as the mean diameter of the marks, which suggests a manufacturing limitation in the charting. The fort dates $$1800–400 BCE when Scorpius and Orion showed about the same orientation at the heliacal rising. The unidentified mark challenges the whole picture. We suggest it could have been the progenitor of a failed supernova, thus offering also the possibility of a verification.  相似文献   

旅游地质新发现--黄果树石林     

王尚彦  戴传固  张惠  王天华 《贵州地质》2003,20(1):2-4

在黄果树瀑布北约2km处，新发现一片长1－1．5km，宽0．5－0．8km的石林，命名为黄果树石林。贵黄高等级公路通过该石林南侧，交通方便。黄果树石林可作为黄果树景区风景点之一而共同开发。黄果树石林由早三叠世（距今2．4亿年前）浅海中沉积形成的安顺组白云岩组成。形成石林的岩层为厚层块状，发育东西向节理，也有南北向和其它方向的节理，且这套厚层岩石上下均为薄－中厚层状岩石。喜山运动以来的差异风化和溶蚀作用逐渐形成了黄果树石林。  相似文献   

雨花台砾石层内含辉木砾石的发现及其意义   总被引：1，自引：1，他引：0  

李立文 《江苏地质》1999,23(3):151-155

通过雨花台砾石层内含辉木雨花石的发现,分析了其重要的科研意义和实用价值。指出对雨花石、辉木化石和树蕨三者的深入研究,将有助于全面探讨古长江流域的发育史,进一步弄清地层进代、研究古生侯和古环境  相似文献