大别山南部宿松群的组成及形成时代   总被引：1，自引：0，他引：1  

高道明  吴维平 《安徽地质》2008,18(2):85-91

在前人工作基础上,根据对大别山南部的区域地质调查和同位素年代学测定,对宿松群的组成和形成时代进行了研究。进一步论证了宿松群可解体为以变质侵入岩为主的蒲河杂岩和变质沉积岩为主的宿松岩群两部分。前者主要分别在原宿松群虎踏石组和蒲河组的范围内,组成岩石变花岗片麻岩和斜长角闪岩为主,其原岩主要为形成于新元古代的花岗岩类和基性侵入岩;后者主要分布在原宿松群大新屋组和柳萍组范围内,组成岩石主要为变质碎屑岩和化学沉积岩,可分为大新屋岩组和柳坪岩组,是不整合在古元古代二长花岗片麻岩之上,时代为中元古代早期。  相似文献   

电(磁)法技术在地下管线探测中的应用   总被引：1，自引：0，他引：1  

杜良法 《测绘与空间地理信息》2008,31(6)

电(磁)法主要有充电法、高密度电法、甚低频法、电磁感应法和电磁波法(探地雷达)等.在地下管线探测中,电(磁)法是最主要的探测方法.本文介绍了电(磁)法探测地下管线的原理和特点,并列举了各种电(磁)法技术在地下管线探测中的应用.笔者对电(磁)法技术在地下管线探测中的应用前景进行了展望,指出电(磁)法技术在地下管线探测中拥有巨大的应用空间.  相似文献   

The fault-controlled skarn W–Mo polymetallic mineralization during the main India–Eurasia collision: Example from Hahaigang deposit of Gangdese metallogenic belt of Tibet     

《Ore Geology Reviews》2014

The Hahaigang W–Mo polymetallic skarn deposit is located in the central-eastern part of Gangdese tectono-magmatic belt in Lhasa terrane, Tibet. The deposit was discovered in 2007 with currently proven 46 million tons of WO₃ ores, 12 million tons of Mo ores, and 1.31 million tons of combined Cu–Pb–Zn ores, at an average grade of 0.20% WO₃, 0.07% Mo, 0.026% Cu, 0.49% Pb, and 3.1% Zn. Ore bodies occur in veins or disseminations, and are confined within the NE-striking Dalong fault zone which is hosted by the Lower-Permian Pangna Group of dominantly quartz sandstone and slate. Several granitic plutons are exposed in the area or known from drill-holes. Ages of these granitic plutons are determined by using zircon U–Pb LA–ICP–MS method. For example, the biotite monzogranite yields a ²⁰⁶Pb/²³⁸U–²⁰⁷Pb/²³⁸U concordia age of 58.66 ± 0.90 Ma and a weighted mean ²⁰⁶Pb/²³⁸U age of 57.02 ± 0.42 Ma. The granite porphyry yields a ²⁰⁶Pb/²³⁸U–²⁰⁷Pb/²³⁸U concordia age of 109.1 ± 8.9 Ma and a weighted mean ²⁰⁶Pb/²³⁸U age of 114.0 ± 2.6 Ma. The biotite monzogranite yields a weighted mean ²⁰⁶Pb/²³⁸U age of 56.1 ± 1.1 Ma. Re–Os isochron age of 63.2 ± 3.2 Ma from 5 molybdenite samples collected from the W–Mo skarn ores is also obtained in this study. The zircon U–Pb and molybdenite Re–Os geochronological data suggest that the W–Mo mineralization was not temporally associated with any of the dated igneous plutons. However, the molybdenite Re–Os age of 63.2 ± 3.2 Ma indicates that the W–Mo mineralization might have occurred during the main India–Eurasia collision that was initiated around 65 Ma. Microprobe analysis of ilvaite that occurs in two generations in the W–Mo skarn ores reveals a close relationship to Ca–Fe–F-rich hydrothermal fluids, which were probably derived from deeply-seated magmas. We suggest that ascent of the fluids was strictly controlled by the ore-controlling Dalong fault zone, and that chemical interaction and metasomatism between the fluids and the Lower-Permian Pangna quartz-feldspathic host rocks produced the ilvaite and the W–Mo polymetallic skarn deposit during the main India–Eurasia collision. Although the majority of the polymetallic deposits in the Gangdese belt are reported to be either pre- or post-main collision, it is evident from this study that the main collision also produced W–Mo polymetallic mineralization within the belt.  相似文献   

四川盆地海相碳酸盐岩的油气成藏条件     

陈英富 《地质与勘探》2016,52(2):357-362

四川盆地位于亚洲大陆中南部,是我国最大的外流盆地。油气资源评价结果(2008)表明,四川盆地海相地层待发现资源量约为50111.84×108m~3,资源勘探潜力巨大。本文从地层的划分、层序格架及层序岩相古地理特征等方面,对四川盆地海相碳酸盐岩油气成藏条件做了进一步研究。认为研究区烃源岩包括下志留统、中二叠统、上二叠统龙潭组和上三叠统须家河组等4套岩石,及局部发育的上二叠统大隆组。储集层粉为构造成因类和沉积成因类,构造成因主要包括裂缝性储层;沉积成因类储层主要是礁滩储层、内幕白云岩储层和风化壳岩溶储层。中二叠统气藏主要为自生自储的裂缝性气藏和台内滩相气藏;茅口组顶部和雷口坡组顶部发育风化壳型气藏;吴家坪组、长兴组及飞仙关组地层含礁滩型气藏;嘉陵江组和雷口坡组地层含内幕白云岩型气藏。  相似文献   

姚家岭锌金多金属矿床围岩蚀变三维空间定量分析研究   总被引：2，自引：1，他引：1  

李晓晖  袁峰  张明明  蒋其胜  韩长生  黄建满  张淑虹  钟国雄 《岩石学报》2016,32(2):390-398

姚家岭锌金多金属矿床是近年来在长江中下游成矿带铜陵矿集区新发现的大型多金属矿床。姚家岭锌金多金属矿床的成矿作用具有多阶段性的特点,矿床范围内围岩蚀变强烈,蚀变类型复杂多样。三维地质信息技术及三维空间分析方法为定量化分析围岩蚀变的空间分布以及与矿化之间的相关关系提供了有利工具。本文基于上述方法,有效地对姚家岭锌金多金属矿床的围岩蚀变的分带性及其与不同矿化之间的关联性行了定量分析。较之于传统研究方法,不仅能快速地对蚀变与矿化的分布特征进行分析,还能从定量的角度获取不同信息之间的规律性和相关性。本文采用的相关方法不但有助于更准确的判定蚀变分带及规律,还可为矿床的成矿模式及找矿模型的建立提供定量化的数据支持。  相似文献   

Distribution and Characteristics of Dinosaur Eggs in China     

HAO Ziguo  FEI Hongcai  HAO Qingqing  LIU Lian  Susan Turner 《《地质学报》英文版》2016,90(1):370-375

正China is one of the most prolific countries for dinosaur material in the world,from skeletons to footprints and eggs.At present,China has documented more than 160kinds of dinosaur,35 genera and 39 ichnospecies of dinosaur footprints,and 17 genera and 44 oospecies of dinosaur eggs.The dinosaur eggs in China are mainly distributed in Xinjiang,Inner Mongolia,Ningxia,Gansu,  相似文献   

胶东玲珑金矿田175号脉群深部地质特征与成矿预测          下载免费PDF全文

朱随洲  王志浩  王春  叶官威  刘仁松  金刚  闵祥吉  周宇  张龙 《地质找矿论丛》2016,31(2):213-219

玲珑金矿属于以石英脉型为主的金矿床,其矿脉受玲珑断裂和破头青断裂控制。区内脉群发育,175号脉群是玲珑金矿的主要大型金矿脉群之一。文章通过总结175号脉群成矿地质背景、矿床地质特征,分析了控矿因素、矿体赋存规律、矿石类型等;阐述了175号脉群深部成矿规律,并根据见矿工程利用地质块段法预测175号脉群11—101勘探线范围-800 m标高以下(332+333)金矿石量192.44×10~4 t,金金属量8.5t。  相似文献   

总梯度模方法在低纬度地区航磁资料解释中的应用          下载免费PDF全文

梁建  线纪安  郭玉峰 《地质找矿论丛》2016,31(4):570-575

对于低纬度地区的航空磁测的ΔT资料,如果化极处理时对磁化方向判断存在误差,用目前的化极方法进行资料处理,要比在高纬度地区化极发生更大的畸变,不适于对资料进行解释。通过一些模型计算及一些实际资料对比,在低纬度地区用航磁总场梯度模划分磁性体地面投影边界是简单实用的一种方法。  相似文献   

湖南湘潭锰矿的地球化学特征及成矿机制     

史富强  朱祥坤  闫斌  刘燕群  张飞飞  赵妮娜  褚明恺 《岩石矿物学杂志》2016,35(3):443-456

湘潭锰矿床的锰矿层赋存于新元古代南华系(成冰系)大塘坡组底部含锰黑色页岩中,含锰矿物主要为菱锰矿。湘潭锰矿的Fe/Mn值低,Th/U、V/(V+Ni)和V/Cr值等地球化学指标显示其发育在氧化-次氧化的沉积环境中,暗示菱锰矿并不是由Mn~(2+)和CO_3~(2-)直接沉淀形成的。湘潭锰矿稀土元素含量高,稀土元素配分模式存在轻微的中稀土元素富集,具有明显的Ce正异常,这些特征指示湘潭锰矿含锰矿物是以锰氧化物或氢氧化物的形式沉淀的。同时,锰矿的碳同位素富集碳的轻同位素,说明有机物参与了菱锰矿的形成过程。综合分析表明,湘潭锰矿成矿过程可以分为沉淀和转化两个阶段:在氧化性的水体中,Mn以氧化物或氢氧化物的形式沉淀;在缺氧且富含有机物质的成岩环境中,Mn氧化物或氢氧化物被有机物还原而转化生成菱锰矿。这与华南地区其他几个典型的大塘坡式锰矿的成矿机制一致。  相似文献   

Detachment folding in a Lower Cambrian–Upper Permian karst reservoir: 3D model of the Yubei 3D area (eastern Markit Slope,Tarim Basin,Northwest China)     

JiuMei Li  LiangJie Tang  Yong Yue  Meng Li  ShengLong Zhang  Yu Long  ShaoHui Luo 《Arabian Journal of Geosciences》2016,9(14):630

A three-dimensional (3D) structural modeling of the Lower Cambrian–Upper Permian Yubei 3D area was performed to understand its structural evolution. This model reproduces the present-day structure of the basin and comprises 11 horizons within Lower Cambrian to Upper Permian rocks. The analysis is based on 3D depth views and faults. The results image salt movements due to tectonics and/or burial. From these observations, this paper deduces that salt structures are correlated to the main faults and tectonic events. From the model analysis, we interpret the timing and geometry of Tarim Basin tectonics. The fault geometry can be resolved based on the strike of the fault, the morphology of hanging wall strata, and the stratigraphic distribution. Emphasis is placed on gypsum rock detachment, considering its movements during the Middle Caledonian event and decoupling effects during tectonic evolution. Moreover, we point to the structural control of the Paleozoic basement and the crustal architecture (Yubei 3D Zone) on the geometry of the Tarim Basin.  相似文献