排序方式： 共有5条查询结果，搜索用时 46 毫秒
1
1.
LI Jun-ya WANG Yu-jue HE Xue-wen XUE Guo-dong XU Huan TIAN Yan-hong ZHAO Li-li CUI Qi-hang 《地下水科学与工程》2019,7(1):61-69
The geothermal resource is a form of "green" and renewable energy with huge development potential in terms of both environmental protection and economy. It was concluded that the exposed hot springs were mostly produced when fluids derived from atmospheric precipitation were heated deep and recurrently under the ground, developed banded geothermal reservoir in the pores of fault damage zones, fissure zones, hornification zones and dikes, and then moved upward with analyzing the geological and hydrogeological data as well as hydrochemical types of the naturally exposed hot springs in the studied region so as to ascertain the accumulation conditions of geothermal resources in a particular county in Western Sichuan and opt for suitable target areas for exploring geothermal resources. Four areas where geothermal resources are potentially located were proposed with analysis of their formation conditions based on this notion, and the "epsilon-shaped" structure in Zhimulin, the "epsilon-shaped" structure in Jiaochang, the vortex structure in Rewugou and the arcuate structure in Shidaguan were analyzed in this paper offering a reference for developing and exploiting the geothermal resources in the region as well as studying the development patterns of other hot springs in this region. 相似文献
2.
新疆西天山阿克萨依铁矿床地质及地球化学特征 总被引：3，自引：2，他引：1
近年新疆阿吾拉勒铁铜成矿带内铁矿找矿勘查取得了突破性进展,阿克萨依铁矿是其中一个新发现并评价的中型规模铁矿床。该矿床的地质特征与带内其他铁矿明显不同,成因不明。矿体主要赋存于下石炭统阿克沙克组的粗安岩、玄武岩、安山岩、安山质凝灰岩,少量赋存于下石炭统大哈拉军山组上段的凝灰岩中。阿克沙克组玄武岩和安山岩富集LREE和LILE（如Rb、Th、K）,亏损HREE和HSFE（Nb、Ta、Ti）,稀土元素呈右倾的配分模式,结合Th-Ta-Hf/3、Zr/4-Y-Nb*2和Th-Nb构造环境判别图解,认为这些火山岩可能形成于岛弧环境。阿克萨依铁矿的形成与岛弧内发育的火山机构有关,矿体受火山机构的次级断裂控制,呈脉状、透镜状,围岩蚀变发育,以绿泥石化、碳酸盐化为主,硅化、绿帘石化为次。矿石主要为浸染状和脉状构造,局部发育块状和角砾状构造。成矿过程可划分为3个阶段：磁铁矿阶段、石英-硫化物阶段和绿泥石-碳酸盐阶段。阿克萨依铁矿区磁铁矿低w（TiO2）（变化范围0~1.7%、平均0.2%）、w（Cr2O3）（0~0.2%、平均0.06%）和w（NiO）（平均值接近0）,明显不同于岩浆分异型钒钛磁铁矿床磁铁矿的w（TiO2）（≥5.4%）,而与热液型和接触交代型铁矿磁铁矿的w（TiO2）相似（平均0.18%~0.33%）;黄铁矿Co/Ni比值都较高（>1）,具火山成因、热液成因黄铁矿的特征;硫同位素δ34S值介于-0.6‰~0.4‰,成矿流体具岩浆硫的特征。初步认为阿克萨依铁矿床可能是与火山活动紧密相关的火山-次火山热液交代型铁矿床。 相似文献
3.
LI Jun-ya WANG Yu-jue HE Xue-wen XUE Guo-dong XU Huan TIAN Yan-hong ZHAO Li-li CUI Qi-hang 《地下水科学与工程》2014,7(1):61-69
The geothermal resource is a form of “green” and renewable energy with huge development potential in terms of both environmental protection and economy. It was concluded that the exposed hot springs were mostly produced when fluids derived from atmospheric precipitation were heated deep and recurrently under the ground, developed banded geothermal reservoir in the pores of fault damage zones, fissure zones, hornification zones and dikes, and then moved upward with analyzing the geological and hydrogeological data as well as hydrochemical types of the naturally exposed hot springs in the studied region so as to ascertain the accumulation conditions of geothermal resources in a particular county in Western Sichuan and opt for suitable target areas for exploring geothermal resources. Four areas where geothermal resources are potentially located were proposed with analysis of their formation conditions based on this notion, and the “epsilon-shaped” structure in Zhimulin, the “epsilon-shaped” structure in Jiaochang, the vortex structure in Rewugou and the arcuate structure in Shidaguan were analyzed in this paper offering a reference for developing and exploiting the geothermal resources in the region as well as studying the development patterns of other hot springs in this region. 相似文献
4.
In the present paper, the fossil record of the archosaurs (dinosaurs, crocodylomorphs and pterosaurs) of the southern Pyrenees before the Cretaceous–Palaeogene (K–Pg) transition is revised. On the basis of this fossil record, a well-dated succession of dinosaurs and other archosaurs is established within polarity magnetochrons C30 and C29r. Almost 150 sites with dinosaur remains have been identified, containing hadrosauroid ornithopods, titanosaur sauropods and theropods, as well as egg sites and tracks. Fossil remains of dinosaurs and other archosaurs are abundant in C29r, disappearing abruptly near the top of the “Lower Red Garumnian” unit of the Tremp Formation. Thus this should be located very close to, or coinciding with the K–Pg boundary. These data suggest that the disappearance of the dinosaurs and other archosaurs was geologically abrupt in the southern Pyrenees, but to date there is no incontrovertible evidence of the presence of the impact level that marks the Cretaceous–Palaeogene boundary. Interestingly, what is highlighted in the southern Pyrenees is that the vertebrate-rich upper Maastrichtian continental sites were replaced by similar sedimentological facies characterized by the virtual absence not only of dinosaurs but also of any vertebrate remain throughout the lower Palaeocene. This could mean that the Danian terrestrial ecosystems of the southern Pyrenees took longer than other areas of the world to recover their biodiversity after the K−Pg extinction event. 相似文献
5.
《China Geology》2021,4(1):1-16
Many large and super-large copper deposits have been discovered and explored in the Tibet Plateau, which makes it the most important copper resource reserve and development base in China. Based on the work of the research team, the paper summarizes the geological characteristics of the main copper deposits in Tibet and puts forward a further prospecting direction. A series of large accumulated metal deposits or ore districts from subduction of Tethys oceanic crust to India-Asia collisionhave been discovered, such as Duolong Cu (Au) ore district and Jiama copper polymetallic deposit. The ore deposits in the Duolong ore district are located in the lowstand domain, the top of lowstand domain, and the highstand domain of the same magmatic-hydrothermal metallogenic system, and their relative positions are the indicators for related deposits in the Bangong Co-Nujiang metallogenic belt. The polycentric metallogenic model of the Jiama copper polymetallic deposit is an important inspiration for the exploration of the porphyry mineralization related to collision orogeny. Further mineral exploration in the Tibet Plateau should be focused on the continental volcanic rocks related to porphyry-epithermal deposits, orogenic gold deposits, hydrothermal Pb-Zn deposits related to nappe structures, skarn Cu (Au) and polymetallic deposits, and the Miocene W-Sn polymetallic deposits.©2021 China Geology Editorial Office. 相似文献
1