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甘肃永登石灰沟奥陶纪岛弧区沉积建造的特征 总被引:5,自引:0,他引:5
长期以来众自然地把岛弧与火山活动联系起来,认为无火山喷发、无火山建造和火山沉积建造就不能称其为岛弧,火山活动无可非议的被认为是判别岛弧的首要标志。火山熔岩及火碎屑岩,自然地成为岛弧区建造的一个必然组成部分。但应予注意的是,火山岩和火山碎屑岩是不是岛弧区建造序列中的唯一成员,这一问题在国内、外该领域的研究中未被引起重视。笔者在我国西北地区的重要造山带之一-北祁连早古生代造山带,进行了较深入的工作并获 相似文献
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东天山古生代板块构造特点及其演化模式 总被引:20,自引:0,他引:20
东天山的古板块构造格局主要由塔里木陆壳板块、西伯利亚陆壳板块和哈萨克斯坦洋壳板块在古生代的活动所奠定的。在古生代,东天山的板块构造格局主要表现为多列岛弧及其间弧间盆地和弧后盆地的形式。自北而南依次发育:博格达-哈尔里克泥盆-石炭纪岛弧,吐哈弧间盆地,觉罗塔格泥盆-石炭纪岛弧,吐哈弧间盆地,觉罗塔格泥盆-石炭纪岛弧,中天山志留-石炭纪岛弧,南天山-红柳河弧后盆地和北山陆缘裂谷带。其主要成因是由于准噶尔洋壳板块向塔里木陆壳板块下俯冲,俯冲带不断后退所形成的。奥陶纪中后期,中天山由塔里木北缘分出,形成具有古老陆块基底的类似于现今日本列岛的中天山岛弧。在其后形成南天山-红柳河弧后盆地和北山陆缘裂谷带。泥盆纪早期,俯冲带后退至觉罗塔格北侧形成觉罗塔格岛弧。泥盆纪晚期,俯冲带后退至博格达-哈尔里克北缘,形成博格达-哈尔里克岛弧。中石炭世至早二叠世,博格达同准噶尔陆块碰撞造山,哈尔里克同麦钦乌拉岛弧碰撞造山。与此同时,南天山-红柳河弧后盆地和北山裂谷带也相继闭合,而吐哈弧间盆地则成为未被消减完的弧间盆地残留下来。东天山古生代板块演化可与现今印度尼西亚地区的板块演化相类比。 相似文献
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中甸岛弧是中国西南三江构造火成岩带中义敦岛弧的组成部分,位于义敦岛弧的最南端,其东部和南部是甘孜-理塘板块缝合带,西部是乡城-格咱深大断裂[1-2]. 相似文献
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东秦岭陡岭古岛弧和武当古弧后盆地及其地质意义 总被引:1,自引:0,他引:1
丹凤-信阳蛇绿混杂带作为秦岭-大别碰撞造山带主缝合带,其南部属于扬子板块北部大陆边缘。研究区域位于东秦岭南翼,是扬子板块北部大陆边缘的一部分。①晚元古-中震旦世,扬子板块北缘为活动型大陆边缘,发育陡岭岛弧和弧后盆地;②晚震旦--早古生代,扬子板块北缘转为被动型大陆边缘,陡岭岛弧构成边缘地块,武发古弧后盆地演化为边缘盆地;③早古生代晚期,华北板块南缘的秦岭岛弧首先与扬子板块北缘的陡岭国缘地块(古岛弧 相似文献
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位于巴基斯坦北部西喜马拉雅的科希斯坦地体为夹持于亚洲板块与印度板块之间的倾斜的岛弧型壳体。科希斯坦岛弧北界为主地幔逆总断层(MMT),北界为北部缝合带(或喀啦昆仑主逆冲断层,MKT),可将其划分为几个地质单元。奇拉斯(Chilas)杂岩体为一长约300km、宽50km的巨型基性侵入岩体,与MMT和MKT近平行展布。它被认为是科希斯坦岛弧的岩浆房根区。奇拉斯杂岩体主要由辉长苏长岩和几个超镁铁质岩-镁铁质岩(简称UMA)岩体组成。前侵入后之中。奇拉斯杂岩体岩石普遍发生轻微变形,出现叶理化和韧性剪切带。UMA主要由橄榄石(含或不含单斜辉石)堆积岩(纯橄岩,异剥橄岩)和斜长石-单斜辉石-斜方辉石堆积岩(二辉辉长岩)组成,含有少量单斜辉石-斜方辉石堆积岩(辉石岩)。辉长苏长岩的地球化学特征表明其为岛弧环境下形成的非堆积岩,而UMA的地球化学特征表明其为岛弧环境下的堆积岩。辉长苏长岩和UMA的主元素地球化学特征在AFM图解上可用堆积和非堆积的模式来解释,辉长苏长岩的稀土和微量元素地球化学特征在100MgO/(MgO TFeO)图解上显示岛弧型特点,且UMA表明其堆积特性。 相似文献
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北山北带地质构造特征 总被引:4,自引:0,他引:4
甘肃北山地区主体属塔里木板块的北缘其内部可划分出北、中、南三个构造带,北带主体为加里东期岛弧带,北山地区于古生代经历了弧-盆体制及裂陷槽的活动大陆边缘的发展,总体上经历了前寒武纪古陆形成阶段,加里东期岛弧及陆缘裂陷-闭合阶段,海西期岛弧期后构造-岩浆活动及陆壳再次裂陷-闭合阶段和中、新生代差异断块升降阶段。 相似文献
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弧-盆体系中岛弧与弧后盆地相间并存是一大特色。本文以昌都地区叠纪弧一盆格局为例,阐明了岛弧、弧后盆地与夹于其间的微陆块等地质特征;划分出2个构造演化阶段,一是早中三叠世江达-阿中岛弧与弧后盆地的发育,二是晚三叠世滞后型岛弧与生达残留弧后盆地的形成,并揭示了其演化的动力学。 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