地热田温度预测的反演电阻率方法     

孟银生  姚长利  刘瑞德  黄力军 《物探与化探》2011,35(1):58-60

论述了地下温度和电阻率之间的关系,在较小范围工区内(考虑测井资料的情况下),利用可控源音频大地电磁测深反演电阻率预测地热田深部温度,探讨了该方法的实际应用效果.事实证明,由可控源音频大地电磁测深数据进行反演得到的电阻率分布,不仅能够探测地层埋深和断裂构造的空间分布情况,而且在一定条件下可以推断热储构造的温度.  相似文献   

冀中南平原土壤氟地球化学特征及其控制因素   总被引：1，自引：0，他引：1  

谷海峰  栾文楼  杜俊  陈志贤  蔡奎  李超 《物探与化探》2011,35(3):388-392

详细研究了冀中南平原土壤氟的地球化学特征,并探讨其控制因素。冀中南平原整体氟含量较高,且分布不均匀,具有明显分带性,分别出现4个高氟带和4个低氟带。氟在该区的分布明显受自然地理、地质因素和人为因素控制,且以自然地理、地质因素为主。在自然地理、地质因素中地貌起主导作用,而在人为因素中化肥为主导因素。  相似文献   

黔北煤田测井中煤层的沉积序列编号解释对比方法及应用   总被引：2，自引：0，他引：2  

张应文  王亮  杨胜发 《物探与化探》2011,35(3):340-344

以黔北煤田习水县双龙井田物探测井的应用为例,利用已知煤层或目的层,采用地质界线特征法、地质标志层特征法、煤层序列解释特征法、煤层层间距比较特征法等,对单条或多条物性参数曲线所表现的测井异常特征进行对比分析,总结煤层判定及煤层沉积序列编号的常用解释方法及经验,从而确定煤炭资源储量。  相似文献   

Geochemical Characteristics and Geological Significance of Early Permian Baya’ertuhushuo Gabbro in South Great Xing’an Range   总被引：1，自引：0，他引：1  

LIU Jianfeng  CHI Xiaoguo  ZHAO Zhi  ZHANG Xingzhou  MA Zhihong  WANG Tiefu  HU Zhaochu 《《地质学报》英文版》2011,85(1):116-129

Field geological investigation and geochemical analysis are carried out on Baya’ertuhushuo Gabbro in South Great Xing’an Range. Field investigation reveals that the gabbro is a magmatic intrusion rather than a component of an ophiolite suite as previously thought. Zircon laser ablation inductively coupled plasma mass spectroscopy (LA-ICP-MS) U-Pb dating indicates the gabbro was formed in 274–275?Ma, just as the widespread volcanic rocks of Dashizhai Formation (P1d), monzogranites and miarolitic alkali-feldspar granites in the study area. The gabbro has SiO2 content between 47.23 wt% and 50.17 wt%, high MgO and FeOT contents of 6.95–11.29 wt% and 7.32–12.24wt%, respectively, and it belongs to low-K tholeiitic series in the SiO2-K2O diagram. The Chondrite-normalized rare earth element (REE) patterns and primitive mantle-normalized spider diagrams of the gabbro are similar to those of Normal Mid-Ocean Ridge Basalt (N-MORB) except for the enrichment of large ion lithophile elements (LILE), such as Rb, Ba and K. In trace element tectonic discriminative diagrams, the samples are mainly plotted in the N-MORB field, and Zircon in?situ Lu-Hf isotopic analysis also indicates the gabbro originated from depleted mantle. Through synthetic studies of the geochemical characteristics and petrogenesis of Baya’ertuhushuo gabbro, volcanic rocks of Dashizhai Formation and granitoids in the area, it is suggested that the early Permian magmatism in the Xilinhot-Xiwuqi area formed in the tectonic setting of asthenosphere upwelling, which was caused by breaking-off of the subducted Paleo-Asian Ocean slab.  相似文献   

U-Pb Dating of Volcanic Rocks and Granites along the Wuyishan Belt: Constraints on Timing of Late Mesozoic Tectonic Events in Southeast China     

XU Xianbing  ZHANG Yueqiao  JIA Dong  SHU Liangshu 《《地质学报》英文版》2011,85(1):130-144

Five volcanic rock samples and two granite samples taken from the volcanic basins in western Fujian and southern Jiangxi were dated by using the zircon laser albation-inductively coupled plasma mass spectrometry U-Pb method. Together with previously dated ages, the dates obtained provide important constraints on the timing of late Mesozoic tectonic events in SE China. The volcanic rock samples yield ages of 183.1±3.5 Ma, ca. 141 Ma to 135.8±1.1 Ma, 100.4±1.5 to 97.6±1.1 Ma, confirming three episodes of late Mesozoic volcanic activities, which peaked at 180±5 Ma, 140±5 Ma and 100±5 Ma, respectively, along the Wuyishan belt. Moreover, based on field investigations of these volcano-sedimentary basins, we have recognized two compressional tectonic events along this belt. The early one was characterized by Upper Triassic to Middle Jurassic NNE-trending folds that were intruded by late Jurassic granites; and the late one caused the Lower Cretaceous volcano-sedimentary layer to be tilted. The dated age 152.9±1.4 Ma of the granitic samples from the Hetian granitic pluton in the Changting Basin and that from the Baishiding granitic pluton, 100.2±1.8 Ma, in the Jianning Basin, give the upper boundaries of these two tectonic events respectively. Hence, the late Mesozoic tectonic evolution of SE China was alternated between extension and compression.  相似文献   

LA-ICP-MS Zircon U-Pb Geochronology of the Fine-grained Granite and Molybdenite?Re-Os?Dating in the Wurinitu Molybdenum Deposit, Inner Mongolia, China   总被引：3，自引：0，他引：3  

LIU Cui  DENG Jinfu  KONG Weiqiong  XU Liquan  ZHAO Guochun  LUO Zhaohu  LI Ning 《《地质学报》英文版》2011,85(5):1057-1066

The Wurinitu molybdenum deposit, located in Honggor, Sonid Left Banner of Inner Mongolia, China, is recently discovered and is considered to be associated with a concealed fine-grained granite impregnated with molybdenite.?The wall rocks are composed of Variscan porphyritic-like biotite granite and the Lower Ordovician Wubin’aobao Formation.?LA-ICP-MS zircon U-Pb dating of the fine-grained granite reveals two stages of zircons,?one were formed at 181.7±7.?4 Ma and?the other at 133.6±3.3 Ma. The latter age is believed to be the formation age of the fine-grained granite, while the former may reflect the age of inherited zircons, based on the morphological study of the zircon and regional geological setting. The Re-Os model age of molybdenite is 142.2±2.5?Ma, which is older than the diagenetic age of the fine-grained granite.?Therefore the authors believe that the metallogenic age of the Wurinitu molybdenum deposit should be?nearly 133.6±3.3 Ma or slightly later, i.e., Early Cretaceous.?Combined with regional geological background research, it is speculated that the molybdenum deposits were formed at the late Yanshanian orogenic cycle in the Hingganling-Mongolian orogenic belt, belonging to the relaxation epoch posterior to the compression and was associated with the closure of the Mongolia-Okhotsk?Sea.  相似文献   

Radiometric Zircon Ages of a Tuff Sample from the Baishantou Member of Wuyun Formation,Jiayin: A Contribution to the Search for the K‐T Boundary in Heilongjian River Area,China     

SUZUKI Shigeyuki  SUN Ge  Ulrich KNITTEL  DANHARA Tohru  IWANO Hideki 《《地质学报》英文版》2011,85(6):1351-1358

The existence of the Cretaceous-Tertiary (K/T) boundary in the non-marine succession is expected at Jiayin in the Heilongjiang River area, China. Zircons from a tuff sample from the Baishantou Member of Wuyun Formation in Jiayin were analyzed by the laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb dating and fission-track dating methods. Ages of 64.1±0.7 Ma (U-Pb) and 61.7±1.8 Ma (fission-track dating) were obtained, which allow re-evaluation of a previously reported late Maastrichian age for the tuff layer that was in conflict with the paleontological evidence. These results confirm the Danian age of the section in agreement with the paleontological evidence.  相似文献   

山西新发现大理岩玉的宝石矿物学特征     

刘云贵  陈涛  李奇  肖姗 《地质科学译丛》2011,(2):13-19

山西北部六棱山地区新发现了一种玉石品种——大理岩玉,其主要有黄色和黄褐色两种颜色,结构较致密,透明度较好,是一种优质的饰面石材和玉雕原料。采用薄片观察、环境扫描电子显微镜、X射线粉末衍射、LA-ICP-MS和常规宝石学仪器等测试手段对该大理岩玉样品的宝石矿物学特征进行了测试与研究。结果显示,该大理岩玉为经变质作用形成的方解石大理岩,所含CaCO3的质量分数为96%～97%,推测Fe元素是该玉石的致色元素;微量的碳质和铁质粉末阻碍了柱状方解石的重结晶,形成条纹结构;方解石为不规则的多边形柱体,呈镶嵌的不规则他形变晶结构。通过分析大理岩玉的结构特征,认为平行于其层纹方向切磨,可使得其成品表面光洁度好,光泽强,不易破损。  相似文献   

海南儋州南江褐铁矿矿床地质特征及控矿因素分析          下载免费PDF全文

张志  胡祥昭  郭旻 《地质找矿论丛》2011,26(1):34-38,45

南江褐铁矿产于下石炭统南好组中,矿体呈脉状、透镜状产出,规模较大、品位很高、质量较好.矿区内发育3组断裂,NNE向断裂控制了矿体的产出,并为矿液运移提供通道;兰洋岩体提供了成矿热液和物质来源.从矿床地质特征分析,为先成的热液型铁矿受古地理条件和气候影响,风化淋滤成褐铁矿,在地表出露为铁帽.预测其找矿前景较好.  相似文献   

地球化学异常下限不同确定方法及合理性探讨   总被引：2，自引：0，他引：2       下载免费PDF全文

姚涛  陈守余  廖阮颖子 《地质找矿论丛》2011,26(1):96-101

地球化学异常下限的确定对于圈定有利的成矿带,指导找矿非常关键.文章以甘肃省白银市白银矿区及外围水系沉积物Cu,Pb,Zn,Ag等4个元素为例,分别运用传统方法、归一化法和分形方法对数据进行处理.将3种方法圈定的异常进行比较发现:传统方法圈出的异常有限,主要是在矿区出现异常;而归一化法可以圈出更多的异常,并且与矿化集中区...  相似文献