福建碧田金银铜矿床冰长石的^40Ar／^39Ar年龄   总被引：10，自引：1，他引：10  

刘晓东  华仁民 《地质论评》2005,51(2):151-155

采用40Ar/39Ar快中子活化年代学方法对采自碧田金银铜矿床的冰长石进行了年龄测定.结果表明,冰长石年龄为91.47土0.39Ma,代表了碧田矿床金-银矿化的形成时代.作为紫金山-碧田地区大规模铜金(银)矿化作用冰长石-绢云母型浅成低温热液贵金属矿床的典型代表,碧田矿床成矿年龄的确定,为本区不同类型铜金(银)矿床时空关系和成因机制的探讨提供了重要的依据.  相似文献   

A Primary Observation on Palynofacies of the Chuangde Section(Late Jurassic-Cretaceous),Gyangz■,Southern Tibet          下载免费PDF全文

LI Jianguo GUO Zhenyu Nanjing Institute of Geology  Paleontology  Chinese Academy of Sciences  Nanjing  Jiangsu 《《地质学报》英文版》2007,(6)

A primary study on palynofacies,which concerns the paleoenvironments from the sight of association of sedimentary organic matter preserved in sedimentary rocks,is conducted for a Late Jurassic-Cretaceous succession at Gyangz(?),southern Tibet.Two palynofacies are recognized,which are formed in different sedimentary environments.The one in the pelagic is infertile in organic productivity and monotonous in component and is dominated by AOMA,while the other,being closely bound up with the slope,is characterized by abundant black phytoclasts that are possibly of algal origin and contains much AOM.The influence of terrestrial input is clear in the latter,for particles generated from terrestrial plants are common.A number of fossil spores and pollen together with some dinocysts are discovered,but they are normally in a bad condition of preservation.Nevertheless,this convinces us that the late Jurassic-Cretaceous succession in the Gyangz(?)area has a potential for palynological stratigraphy.We have also proved that the volume of PM can achieve similar results in presenting the productivity of organic matter as the weight of TOC does.This technique is much easier in the laboratory than that we do with TOC.  相似文献   

中国东南部白垩系综合地层学研究的新进展   总被引：9，自引：0，他引：9  

李耀西  汪迎平等 《地质学报》2001,75(4):451-458

笔者以盆地分析学、构造－沉积学、事件地层学、层序地层学等多学科手段对中国东南部白垩系进行综合研究,对过去有争议的、特别是关键性的地层问题,从成因机制上进行分析判断,并提出了一些新的看法。研究认为,该区盆地的形成与演化、构造－沉积旋回、地层相序与层序、地质事件等,主要受控于相同的慕式构造运动,是同一诱因形成的、表现形式不同的地质记录,因而彼此间有成因联系和对应关系,可以互相验证和补充,从而达到深化研究的目的。通过对上述手段所获信息的综合研究,对“塘上组”的时代归属、“丽水运动”是否存在、永康群与“天台群”以及方岩组、中戴组、“赤城山组”等类磨拉石建造间的层位关系等有争议的问题提出了新的认识。最后,还提出了中国东南部各省白垩纪地层的划分对比方案。  相似文献   

C_2H, HC_3N and HNC observations in OMC-2/3     

Qiang Liu    Ji Yang  Yan Sun  Ye Xu Purple Mountain Observatory  Chinese Academy of Science  Nanjing  China Graduate University of Chinese Academy of Sciences  Beijing  China 《中国天文和天体物理学报》2011,(6)

For the first time, the OMC-2/3 region was mapped in C2H (1-0), HC3N (10-9) and HNC (1-0) lines. In general, the emissions from all the three molecular species reveal an extended filamentary structure. The distribution of C2H cores almost follows that of the 1300μm condensations, which might suggest that C2H is a good tracer to study the core structure of molecular clouds. The core masses traced by HNC are rather ?at, ranging from 18.8 to 49.5 M , while also presenting a large span for those from C2H, rangi...  相似文献   

~(12)CO,~(13)CO and C~(18)O observations along the major axes of nearby bright infrared galaxies     

Qing-Hua Tan      Yu Gao  Zhi-Yu Zhang  Xiao-Yang Xia Purple Mountain Observatory  Chinese Academy of Sciences  Nanjing  China Graduate School of Chinese Academy of Sciences  Beijing  China Tianjin Astrophysics Center  Tianjin Normal University  Tianjin  China 《中国天文和天体物理学报》2011,(7)

We present simultaneous observations of 12CO,13CO and C18O J=1-0 emission in 11 nearby(cz<1000 km s-1) bright infrared galaxies.Both 12CO and 13CO are detected in the centers of all the galaxies,except for 13CO in NGC 3031. We have also detected C18O,CSJ=2-1 and HCO+J=1-0 emission in the nuclear regions of M82 and M51.These are the first systematical extragalactic detections of 12CO and its isotopes from the PMO 14 m telescope.We have conducted half-beam-spaced mapping of M82 over an area of 4×2.5 and major...  相似文献   

Recent progress of solar physics research in China     

Cheng Fang School of Astronomy  Space Science  Nanjing University  Nanjing  China  Key Laboratory of Modern Astronomy  Astrophysics  Ministry of Education 《中国天文和天体物理学报》2011,(12)

Owing to the largely improved facilities and working conditions,solar physics research in China has recently shown marked development.This paper reports on the recent progress of solar physics research in Mainland China,mainly focusing on several hot issues,including instrumentations,magnetic field observations and research,solar flares,filaments and their eruptions,coronal mass ejections and related processes,as well as active regions and the corona,small-scale phenomena,solar activity and its predictions....  相似文献   

An experimental indoor phasing system based on active optics using dispersed Hartmann sensing technology in the visible waveband     

Yong Zhang    Gen-Rong Liu  Yue-Fei Wang  Ye-Ping Li  Ya-Jun Zhang  Liang Zhang    Yi-Zhong Zeng  Jie Zhang  National Astronomical Observatories /Nanjing Institute of Astronomical Optics & Technology  Chinese Academy of Sciences  Nanjing  China Key Laboratory of Astronomical Optics & Technology  Nanjing Institute of Astronomical Optics & Technology  China Graduate University of Chinese Academy of Sciences  Beijing  China 《中国天文和天体物理学报》2011,(9)

A telescope with a larger primary mirror can collect much more light and resolve objects much better than one with a smaller mirror,and so the larger version is always pursued by astronomers and astronomical technicians.Instead of using a monolithic primary mirror,more and more large telescopes,which are currently being planned or in construction,have adopted a segmented primary mirror design.Therefore,how to sense and phase such a primary mirror is a key issue for the future of extremely large optical/infr...  相似文献   

贵州剑河乌溜-曾家崖寒武系第5阶全球层型剖面及点位研究的新资料   总被引：1，自引：0，他引：1  

Frederick A.Sundberg  赵元龙  袁金良  林日白 《地层学杂志》2010,34(3)

贵州剑河八郎乌溜—曾家崖寒武系第5阶底界潜在的全球层型剖面及点位上下的动物群(三叶虫和无铰纲腕足类)有显著的变化;研究的剖面厚约4.5m,穿过首现点位Oryctocephalus indicus。经逐层化石的采集和深入的研究,证实在寒武系第4阶或寒武系第2统顶部Ovatoryctocara granulata-Bathynotus holopygus带与寒武系第5阶或寒武系第3统底部Oryctocephalus indicus带之间大约有20cm的贫化石间隔区。这一动物群的突变是在均一的岩相中发生的,表明该剖面是建立寒武系第5阶(或第3统)底界的全球层型剖面和点位(GSSP)理想剖面。  相似文献   

江苏地温水温场特征及地热异常分布规律与控制条件探讨   总被引：1，自引：0，他引：1  

赵剑畏  许家法 《江苏地质》1997,21(1):27-35

江苏地温分布的一般规律是：坳陷区地温高于隆起区，坳陷区中次级正向构造高于负向构造，隆起区中则相反，此外，地温随深度加大而增高，全省的第Ⅱ、Ⅲ、Ⅳ含水层中，共划盼出热水异常３５个，按平面分布的重叠性归并为２１个地热异常，其中大部分可归纳为个异常带，扬子准地台区是本省地热异常的主要分布区。  相似文献