贵州二叠纪与南华纪锰矿主要矿床地质特征对比及意义          下载免费PDF全文

刘志臣  周琦  朱璐艳  陈登  汪洋  颜佳新  杜远生  袁良军  张遂 《贵州地质》2018,35(4):363-368

贵州南华纪古天然气渗漏沉积型锰矿通过成矿理论和找矿预测方法的创新,近年来不断取得巨大的找矿成果,在国内外产生重要影响,已成为国内最重要的锰矿床类型。本文通过对贵州二叠纪锰矿与南华纪锰矿矿床地质特征的对比研究发现:二者在成矿构造背景、同沉积断层(控矿构造)、成矿物质来源、矿石与地球化学特征、锰矿成矿系统特征等方面十分相似,在结构构造特征、沥青球特征、盖帽白云岩和冷泉碳酸盐岩等方面也存在一些差别。在此基础上,贵州二叠纪锰矿通过借鉴和运用贵州南华纪古天然气渗漏沉积成矿理论和找矿预测方法,已在遵义锰矿国家整装勘查区取得重大进展。说明"内生外成"的古天然气渗漏沉积型锰矿成矿理论和找矿预测方法,在相似的成矿地质背景条件下,具有普适性和推广意义。  相似文献   

Variance-covariance component estimation for structured errors-in-variables models with cross-covariances     

Lv  Zhipeng  Sui  Lifen 《Studia Geophysica et Geodaetica》2019,63(4):485-508

Studia Geophysica et Geodaetica - In this contribution, an iterative algorithm for variance-covariance component estimation based on the structured errors-in-variables (EIV) model is proposed. We...  相似文献   

The imprint of the ENSO activities on the South China Sea wave climate     

Wang  Xuechao  Liu  Qin-Yan  Sui  Dandan  Wang  Dongxiao 《Ocean Dynamics》2020,70(10):1315-1323

Ocean Dynamics - Global warming is changing the global wave climate, making waves stronger. In this study, we find that the wave climate in the South China Sea (SCS) undergoes an intensifying trend...  相似文献   

帕米尔高原Rushan-Pshart古特提斯洋或中特提斯洋争论的岩石地球化学证据     

徐天德  王世锋  汤文坤  姚鑫 《地质科学》2020,(1):218-233

帕米尔高原上广泛分布的加里东期火山岩,印支期火山岩与燕山期火山岩被认为是块体依次向北俯冲拼贴到欧亚板块上的产物。特别是燕山期火山岩被认为是Rushan-Pshart中特提斯洋闭合的产物。但近年来地层古生物、火山岩证据不断表明Rushan-Pshart洋闭合时间在晚三叠一早侏罗世,由此限定Rushan-Pshart古特提斯洋性质,而帕米尔高原上广泛分布的燕山期火山岩是更南部的Shyok中特提斯洋闭合的产物。目前,中国境内Rushan-Pshart缝合带属性的研究工作展开较晚,研究程度较低。我们对塔什库尔干明铁盖沟一线燕山期火山岩带展开的工作发现零星分布的印支期花岗岩。印支期花岗岩错石U・Pb年龄显示岩体侵位时间在201 Ma左右。全岩主量元素特征表明岩石为I型高钾钙碱性闪长花岗岩;稀土元素在球粒陨石标准化图解中呈轻稀土元素相对富集,重稀土元素相对亏损的右倾海鸥型。明铁盖岩体的微量元素显示大离子亲石元素明显富集,而高场强元素明显亏损。稀土微量元素特征倾向花岗岩属性为岛弧型花岗岩,Sr-Nd-Hf同位素比值特征显示岩体形成于下地壳部分熔融环境。岩体的地化特征表明岩体形成的构造环境为板块汇聚的洋壳俯冲阶段,结合区域地质特征,我们将花岗岩体归为Rushan-Pshart古特提斯洋壳俯冲消减的产物。Rushan-Pshart缝合带传统上认为是中特提斯带,近年的研究进展认为其为古特提斯缝合带,本文的工作支持这种观点。Rushan-Pshart古特提斯缝合带的确立对帕米尔高原与青藏高原主体的块体对比提供了可信的对比方案,并对青藏高原新生代陆内变形方式的争论提供了可靠的证据。  相似文献   

A Comparison Study of Sensitivity on PJ and NPS Models in China Seas     

GUO Xiangming  ZHAO Dongliang  ZHANG Lijun  WANG Hongguang  KANG Shifeng 《中国海洋大学学报(英文版)》2019,(5)

Evaporation duct is an ubiquitous natural phenomenon over the ocean and can be diagnosed by evaporation duct model. The model proposed by Paulus and Jeske and another model established by the American naval postgraduate school are the most widely used. They are called PJ model and NPS model, respectively. Two methods are used to investigate the global sensitivity of PJ model and NPS model in China Seas. The first method is based on meteorological and oceanographic observation data in China Seas. Considering the system random error caused by sensor measurement inaccuracies, the mean relative error and mean absolute error are used as criterion for sensitivity analysis. The second method, called Extended Fourier Amplitude Sensitivity Test(EFAST), takes into account the interaction between input parameters and is used for sensitivity analysis. The results show that NPS model is more sensitive to the random errors of sensors than PJ model. The mean relative errors of PJ model and NPS model are 11.43% and 14.81%, respectively. The results of global sensitivity parameter analysis indicate that wind speed is the key factor of PJ model, while all input parameter of NPS model have relatively large total sensitivity index. In addition, sensitivity analysis results confirm that wind speed is one of main driving factors for the formation of evaporation duct. These results are valuable for the selection of diagnosis models for evaporation duct, the evaluation of radio wave propagation in the marine atmospheric surface layer, and the prediction technique of evaporation duct based on numerical weather prediction(NWP) in China seas.  相似文献   

Establishment of a diatom-total phosphorus transfer function for lakes on the Songnen Plain in northeast China     

Sui  Fengyang  Zang  Shuying  Fan  Yawen  Lu  Xinxin  Hui  Hongkuan 《中国海洋湖沼学报》2020,38(6):1771-1786

Journal of Oceanology and Limnology - To understand the relationship between planktonic diatoms and environmental variables in the lakes on the Songnen Plain, northeast (NE) China, we investigated...  相似文献   

Flow and high sediment yield from the Huangfuchuan watershed   总被引：2，自引：2，他引：0  

J. Sui Ph.D.  Y. He Ph.D.  B. W. Karney Ph.D. 《International Journal of Environmental Science and Technology》2008,5(2):149-160

This study deals with general features of sediment transport in the Huangfuchuan river, an important branch river of the Yellow river, draining the Loess Plateau in China. The long-term precipitation records at 3 climate stations near the watershed have been used to assess the changes in precipitation in this region. By introducing metrics for runoff and sediment transport, long-term observations on discharge and sediment concentration at the Huangfuchuan gauging station on the Huangfuchuan river have been used to assess the changes in runoff and sediment transport in the Huangfuchuan River compared with those at the Toudaoguai and Fugu gauging stations on the Yellow river. It is found that both runoff and sediment metrics have a clearly downward trend. From July to August, the long-term sediment transport modulus at the Huangfuchuan gauging station is much higher than those at the Toudaoguai and Fugu stations on the Yellow river. The long-term average sediment transport modulus at the Huangfuchuan gauging station are high, ranging from 14000. t/(km² y) but decreasing to 5900 t/(km² y) over the last 10 years. Additionally, analyses on grain size distribution of suspended load in the Huangfuchuan and Yellow river have been conducted.  相似文献   

可考虑历史洪水信息的广义极值分布线性矩法的研究   总被引：3，自引：1，他引：2  

陈元芳  李兴凯  陈民  许睢  马斌勋 《水文》2008,28(3):8-13

在水文及其他行业中广义极值分布(GEV)是一种较为常用的分布线型,包括极值Ⅰ型、极值Ⅱ型和极值Ⅲ型分布.在介绍了该分布线性矩与其参数关系后,给出了有效的可以考虑历史洪水信息的线性矩公式,并对由线性矩推求分布密度函数中k值作了改进.通过统计试验计算分析了线性矩在该分布中的统计性能及历史洪水公式的适用性,并与绝对值准则和平方和准则两种不同优化适线法、矩法作了比较.统计试验表明,改进k值计算后的线性矩法略优于传统线性矩法.从总体上讲,改进k值计算后的线性矩法优于平方和准则适线法及矩法,其参数及设计值的不偏性很好,与绝对值准则适线法总体上相当.  相似文献   

龙门山断裂带北段晚新近纪以来的右行走滑运动及其构造变换研究——以青川断裂为例   总被引：12，自引：1，他引：11       下载免费PDF全文

樊春  王二七  王刚  王世锋 《地质科学》2008,43(3):417-433

龙门山断裂带位于青藏高原东缘,构成了青藏高原和四川盆地的重要构造边界。近年来的研究表明:在新生代晚期,除了存在逆冲推覆之外,龙门山的中段和南段还发生了明显的右行走滑活动。对龙门山北段的青川断裂进行的系统研究发现:断裂具有明显的右行走滑特征,沿断裂发育大量不同规模的水系位错,其中嘉陵江水系位错规模最大,据此可确定青川断裂的最大位移量为17km。进一步的野外工作证实断裂的走滑位移在尾端发生构造变换,位于断裂南西端的轿子顶穹隆是叠加构造,吸收了青川断裂的部分位移量;位于断裂北东端的汉中盆地则是处于伸展应力环境下的断陷盆地,吸收了其大部分位移量。  相似文献   

地极的移动和全球构造     

田世丰 《地球科学》1991,16(4):395-401

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