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华南与燕山期花岗岩有关的稀土、稀有、有色金属矿床成矿系列 总被引：19，自引：4，他引：19
本文所述及的地区在地质构造上属黄汲清先生所划分的华南加里东褶皱带的范围。该区在下古生代时期为冒地槽,志留纪时发生加里东运动,褶皱隆起,结束了地槽阶段。加里东运动之后,此区仍不断经受构造运动,成为比较典型的构造活化区。主要表现为:在海西时期一些地带强烈断陷,堆积了巨厚的沉积物,如湘南、河池—南丹等地区;印支—燕山时 相似文献
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一、地槽区的发育在上一篇文章中已指出,地槽带在其演化中经历一系列时期或旋迥,其延续时间从300—400百万年(较早的)到150—200百万年(较晚的)。对各个地槽区,特别是组成地槽带的地槽系而言,发育最活跃的时期是最后一个期(旋迥),有时是倒数第二个期,这个期以地槽区彻底转变为褶皱山区,而地槽系彻底转变为褶皱山脉而告终,其后在这一区域确立了陆台体制。这个期(旋迥),确切说以沉降为主的前半期,叫做主地 相似文献
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在青海北祁连优地槽褶皱带托勒山复向斜中,出露一套下古生界浅变质碎屑岩夹灰岩、火山岩,上古生界山间凹陷碎屑岩,中生界沉积岩,构造线大都呈北西西向。横切构造线的天盆河、骆驼河中下游均有采金历史。1984年青海省物勘队配合1/5万区域地质调查开展了同比例尺物化探工作,化探以水系沉积物测量为主。根据分析成果,圈定铅锌异常、砷异常和铜、铋等异常,在砷异常分布地段,局部有微弱金异常伴生。砷金异常主 相似文献
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一、北祁连地质构造概论位于中朝准地台西南部的北祁连山,是一较为典型的优地槽褶皱带。它北邻陆棚海型冒地槽——走廊过渡带,与阿拉善台隆相望;南侧是祁连中间隆起带;西北隅衔塔里木地台;东南与秦岭褶皱系毗邻(图1)。北祁连优地槽褶皱带与走廊过渡带、祁连中间隆起带,南祁连褶皱带,共同构成祁连褶皱系。北祁连地槽演化从中寒武世开始,经历晚寒武世、奥陶纪和志留纪地槽发展阶段,沉积厚达2万余米,于志留纪末褶皱成陆,结束地槽期。地槽内有多期蛇绿岩侵位和蛇绿混杂岩 相似文献
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西准噶尔优地槽褶皱带沉积建造特征及其多旋回发展 总被引：2，自引：0，他引：2
西准噶尔优地槽褶皱带是巨大的中亚-蒙古地槽的一部分,属克拉通间地槽,它由奥陶纪、志留纪、泥盆纪和石炭纪四个时期的地槽沉积物组成。根据沉积建造特征,可分成三种成因类型:(1)大陆边缘裂谷型优地槽;(2)岛弧型优地槽;(3)大陆边缘裂谷-岛弧型优地槽。此外,还可以划分出对偶性冒地槽和地中海型冒地槽。它们分别代表该优地槽褶皱带不同发展阶段地槽分化的产物。就沉积建造而言,该优地槽褶皱带具多旋回发展,表现在下部陆屑建造、蛇绿岩建造、安山质火山岩建造以及上部碎屑岩建造都具多旋回性。该褶皱带多旋回发展过程可以划分成早期旋回(O-S)、主旋回(D-C)和后期旋回(P)。主旋回之后,西准噶尔已成褶皱山系。优地槽褶皱带多旋回发展过程实际上是地槽迁移的过程。大陆边缘裂谷的发生和消亡与古大洋板块的俯冲有关。因此一般而言,古大洋板块的多旋回俯冲可以导致地槽褶皱带的多旋回发展。 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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正1 Introduction Geological studies established on several sections in Lanping-Simao basin have shown that the salt-bearing strata of Mengyejing formation(Yunlong Fm.in Lanping basin)are constituted by an alternation of salt layers and interbedded facies.The latter consists mainly of mudstones,and mudstone-rich conglomerate.The mineralogy and geochemistry of salt-bearing beds and 相似文献
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正On 22nd April 2014,with the approach of the 45th World Earth Day,China’s Ministry of Land and resources issued the status of China’s mineral resources in 2013.The first task of the prospecting breakthrough strategy action implemented in the last five years has been completed,and China’s security capacity for mineral resources has been significantly improved.In the 相似文献
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正There are more than 700 salt lakes with area of more than 1km2 on the Qinghai-Tibet Plateau of China.In recent years,an oilfield brine was also found in the Nanyishan Section of Qaidam Basin in the Qinghai-Tibet 相似文献
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正1 Introduction Physical and numerical models are constructed to investigate the evolution and mechanism of salt migration driven by tectonic processes.In recent years,we have designed and ran series of models to simulate salt 相似文献
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YUAN Qin LI Jianguo QIN Zhanjie WEI Haicheng SHENG Shurong SHAN Fashou 《《地质学报》英文版》2014,88(Z1):276-276
正The study of Cretaceous-Palaeogene salt-bearing strata of the Khorat Basin Laos and the Lanping-Simao Basin in Yunnan,China has an great significance not only in explaining the basin evolution and the genesis of potash 相似文献
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正Potash is one of the long-term scare deposits in China,and potash prospecting has long been listed as a key brainstorm project for our nation and geological prospecting units.There have been considerable studies in search for potash deposits in the Kuqa depression of the Tarim basin(Jackson et al.,1991;Gemmer et al.,2004;Vendeville,2005;Vendeville and Jackson,1992a,1992b), 相似文献
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正1 Introduction Qaidam Basin in Qinghai,including 43 salt lakes with multiple dominant mineral such as potassium,magnesium,lithium etc.,is the most intensive distribution of Saline 相似文献