Deep Geodynamics of the Himalaya Orogeny     

G.F.UfimtsevWT  ”BX 《地学前缘》2000,(Z1)

DEEP GEODYNAMICS OF THE HIMALAYA OROGENYRFBR( grant 990 56 56 38)  相似文献   

    

Nikolay V.  Tsukanov  Wolfgang  Kramer  Sergey G.  Skolotnev  Marina V.  Luchitskaya  Wolfgang  Seifert 《Island Arc》2007,16(3):431-456

Abstract   The geological, geochemical and mineralogical data of dismembered ophiolites of various ages and genesis occurring in accretionary piles of the Eastern Peninsulas of Kamchatka enables us to discriminate three ophiolite complexes: (i) Aptian–Cenomanian complex: a fragment of ancient oceanic crust, composed of tholeiite basalts, pelagic sediments, and gabbroic rocks, presently occurring in a single tectonic slices (Afrika complex) and in olistoplaques in Pikezh complex of the Kamchatsky Mys Peninsula and probably in the mélange of the Kronotsky Peninsula; (ii) Upper Cretaceous complex, composed of highly depleted peridotite, gabbro and plagiogranite, associated with island arc tholeiite, boninite, and high-alumina tholeiitic basalt of supra-subduction origin; and (iii) Paleocene–Early Eocene complex of intra-island arc or back-arc origin, composed of gabbros, dolerites (sheeted dykes) and basalts produced from oceanic tholeiite melts, and back-arc basin-like dolerites. Formation of the various ophiolite complexes is related to the Kronotskaya intra-oceanic volcanic arc evolution. The first ophiolite complex is a fragment of ancient Aptian–Cenomanian oceanic crust on which the Kronotskaya arc originated. Ophiolites of the supra-subduction zone affinity were formed as a result of repeated partial melting of peridotites in the mantle wedge up to the subduction zone. This is accompanied by production of tholeiite basalts and boninites in the Kamchatsky Mys segment and plagioclase-bearing tholeiites in the Kronotsky segment of the Kronotskaya paleoarc. The ophiolite complex with intra-arc and mid-oceanic ridge basalt geochemical characteristics was formed in an extension regime during the last stage of Kronotskaya volcanic arc evolution.  相似文献   

  总被引：5，自引：0，他引：5  

Andrey A. Sorokin 《中国科学D辑(英文版)》2005,48(5):613-621

The Mohe region near the border area of China with Russia is in Heilongjiang Province. Topographically the area consists of lower mountains or hills situated at the northern end of the Da Hinggan Mountains. Struc-turally the Mohe basin rests on the north margin of the Ergun Block, and the Mongol-Okhotsk Orogen is lo-cated to the north of the basin. Due to poor access conditions and good vegetation coverage, previous researches on the basin are much weak with few spe-cial geological inves…  相似文献   

    

《Chemie der Erde / Geochemistry》2020,80(1):125596

Petrographic and geochemical studies characterize lithologies of the Khambal Formation deposited in the Sindreth Basin as arkosic, subarkosic, and quartzarenite. Weathering indices, such as CIA and CIW in conjunction with the ACNK diagram, prescribe mostly moderate chemical weathering with intermittent pulses of extreme weathering in the source area. The discrimination diagrams suggest that these Neoproterozoic clastics were deposited in an active rift basin. Provenance indicators of the detritus components point to a terrane possessing subordinate mafic material in conjunction with large felsic components. A comparison of immobile element ratios with probable source rocks suggest that the Mesoproterozoic Delhi arc situated to the east of the Sindreth Basin could be the possible source. Our mixing calculation defines the proportion of end member components in the Delhi arc. Geodynamic considerations relate the origin of the Sindreth Basin to the processes of disintegration and reassembly of supercontinents.  相似文献   

江西银山矿田伴生金银综合回收利用研究   总被引：2，自引：0，他引：2  

张锦章 《矿产与地质》1997,11(3):192-198

叙述了银山铜铅锌多金属矿田铅锌成矿系列和铜硫成矿系列６个成矿带中伴生金银的赋存状态、富集特征和成矿规律，并进行伴生金银相关性分析。认为伴生金银是以独立矿物存在为主，主要载体矿物有黄铜矿，含砷铜矿物、黄铁矿、方铅矿和闪锌矿。Ａｕ、Ａｇ与Ｐｂ、Ｚｎ、Ｃｕ、Ｓ密切相关。同时分析了金银生产中存在的具体问题，提出综合回收金银的措施和建议。  相似文献   

西藏丁青蛇绿岩高铬型和高铝型铬铁矿的矿物化学和矿物包裹体特征及其对构造环境的指示意义          下载免费PDF全文

李观龙  刘飞  朱昕洋  刘朋东  杨经绥 《岩石学报》2024,40(12):3753-3780

班公湖-怒江蛇绿岩带是目前我国铬铁矿找矿最有潜力的成矿带之一, 在我国铬铁矿找矿与铬资源供应中具有极其重要的地位。丁青蛇绿岩作为班怒带中出露面积最大和铬铁矿矿点最多的岩体, 同时发育高铬和高铝两种类型的铬铁矿。本研究以丁青蛇绿岩中的高铬型和高铝型铬铁矿矿石及其围岩地幔橄榄岩为研究对象, 开展了详细的岩石学、矿物包裹体和矿物化学等分析与研究工作。研究显示, 高铬型和高铝型铬铁矿矿石与围岩纯橄岩和方辉橄榄岩的铬尖晶石的矿物化学、包裹体类型和组合及其成分等特征均表现出显著的不同。高铬型铬铁矿矿石中铬尖晶石的Cr^#值为70.51~73.51, NiO在0.05%~0.16%之间, TiO₂=0.05%~0.17%。高铝型铬铁矿矿石中铬尖晶石的Cr^#值为30.84~31.87, NiO=0.15%~0.27%, TiO₂=0.14%~0.28%。高铬型铬铁矿矿石中铬尖晶石的矿物包裹体以角闪石和单斜辉石为主, 高铝型铬铁矿矿石中的铬尖晶石则以橄榄石和角闪石与单斜辉石的多晶矿物包裹体为主。通过铬尖晶石主量元素计算成矿母岩浆的组成, 高铬型铬铁矿矿石及其围岩纯橄岩中铬尖晶石的母岩浆组成反映了弧前玻安岩的地球化学特征, 而高铝型铬铁矿矿石及其围岩纯橄岩中铬尖晶石的母岩浆组成表现出拉斑玄武岩特征。高铬型铬铁矿矿石及其围岩地幔橄榄岩的矿物化学和矿物包裹体数据指示其形成于弧前的构造环境, 而高铝型铬铁矿形成于俯冲初始阶段的弧前环境。结合丁青地幔橄榄岩具有较高的部分融熔程度和大陆岩石圈地幔的Re-Os同位素特征, 暗示丁青蛇绿岩可能形成于陆缘弧前环境。

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Zong‐Yuan Tang  De‐You Sun  An‐Qi Mao  Dong‐Guang Yang  Chang‐Zhou Deng 《Geological Journal》2019,54(6):3737-3754

In this paper, we report on LA‐ICP‐MS zircon U–Pb dates of 14 Mesozoic volcanic rocks from the central Great Xing'an Range (CGXR). These data are integrated with the temporal and spatial distribution of local magmatism‐related Mesozoic mineralization, in an effort to develop an understanding of the geodynamic evolution of the region. Periodic magmatic events in the GXR date from ~1,703 through ~145 Ma. Mesozoic volcanism in the CGXR can be subdivided into three episodes: Triassic (250–205 Ma), Early–Middle Jurassic (182–165 Ma), and Late Jurassic–Early Cretaceous (155–115 Ma). A revision of the previously defined volcanic sequence is offered using a combination of our zircon U–Pb ages and published Mesozoic geological and geophysical evidence from northeast China. We propose that (a) Early–Middle Triassic volcanism in the CGXR resulted from subduction of the Paleo‐Asian oceanic plate; (b) Late Triassic volcanism was related to subduction of the Mongol–Okhotsk oceanic plate (especially near the Erguna Block) and subsequent extension after the closure of the Paleo‐Asian Ocean; (c) Early–Middle Jurassic volcanism was mainly controlled by the southward subduction of the Mongol–Okhotsk oceanic plate; (d) Late Jurassic–initial Early Cretaceous magmatism was initiated by closure of the Mongol–Okhotsk Ocean; and (e) late Early Cretaceous volcanism was induced following the final closure of the Mongol–Okhotsk Ocean and rollback of the Paleo‐Pacific oceanic plate.  相似文献   

扬子板块北缘米仓山地区野猪塘金矿地质特征及成矿时代          下载免费PDF全文

尼加提·伊里  高阳  黄岗    贾飞  宇峰  刘芯佟  徐骏 《地球科学与环境学报》2024,(6):746-757

扬子板块北缘米仓山地区在新元古代早期发生了强烈的板块相互作用及深部岩浆活动,但区域上同时期的成矿作用发育程度尚不清楚。野猪塘金矿是近年来在米仓山地区新发现的中型金矿床,在矿床地质特征详细调查的基础上,对成矿期热液白云母进行了原位Rb-Sr定年,对其成矿时代进行厘定,并探讨其成矿构造背景。野猪塘金矿体主要赋存在中元古界麻窝子组变质沉积岩中,矿体分布受NEE向朱家坝断裂的次级断裂带控制。金矿体呈脉状和透镜状产出,矿体围岩主要为大理岩、石英岩和千枚岩。矿区内可划分出3条金矿化蚀变带,带内硅化、白云母化与金矿化关系最为密切。野猪塘金矿石按矿物共生组合关系可划分为3种类型,分别为黄铁矿矿石、黄铁矿-褐铁矿矿石及褐铁矿矿石。矿石中的金属矿物主要有黄铁矿、褐铁矿和自然金等,脉石矿物主要为石英、白云母和绢云母等。金成矿过程可划分为热液期和表生期两期,其中,热液期可进一步划分为石英-黄铁矿阶段和石英-白云母-硫化物阶段(主成矿阶段)。热液白云母原位Rb-Sr定年获得的等时线年龄为(850±20)Ma,表明金成矿发生在新元古代早期。这一结果与米仓山地区新元古代早期岩浆作用时代相一致,矿床形成于该时期扬子板块北缘的板块俯冲背景。通过金成矿时代和构造背景的对比认为,扬子板块周缘具有较大的与罗迪尼亚超大陆聚合和裂解有关的金成矿潜力。  相似文献   

基于机器学习的大洋玄武岩构造环境判别研究          下载免费PDF全文

徐堃;关馨儿;吕豪哲;赵霄;热则耶·如孜;陈艳虹 《海洋地质与第四纪地质》2024,44(4):190-199

玄武岩的地球化学成分与其产出构造环境密切相关,是研究地球深部物质组成与动力学过程的重要岩石。为了判别玄武岩形成的构造环境,前人根据玄武岩的地球化学特征建立了一系列构造判别图,然而这些判别图仅限于二维或三维判别。随着全球玄武岩样品地球化学数据的爆发性增长,这些构造判别图逐渐暴露出其局限性强、准确率较低的缺点。在地学与大数据结合发展的背景下,利用机器学习方法有利于更全面和深入分析数据,建立高准确率和高效率的构造环境判别模型。因此,本文利用GEOROC和PetDB数据库,经过一系列数据下载、处理等步骤,建立了全球现代大洋玄武岩数据集。通过支持向量机（SVM）和随机森林（RF）机器学习算法,训练出高准确率的高维判别模型。本文分析了不同机器学习算法和不同地球化学成分数据集对现代大洋玄武岩构造环境判别的影响,并将各个判别模型应用于蛇绿岩数据当中,探讨机器学习模型在判别古老大洋岩石圈（蛇绿岩）形成构造环境下的应用前景。这项工作为大洋玄武岩形成的构造环境判别提供了更高维度的判别手段,是大数据时代下机器学习如何在地球科学领域应用的一次有益尝试。  相似文献   

高层结构-混联Ⅱ型惯容阻尼耗能体系减震性分析     

王晓琳  王善库  葛新广  王昌盛 《地震工程与工程振动》2024,44(5):176-187

针对高层结构中设置混联Ⅱ型惯容阻尼器组成耗能体系的随机响应分析复杂的问题,提出了结构位移及阻尼器阻尼力响应的封闭解,并基于所获得的封闭解探究了实模态振型数对分析精度的影响和在原结构层间位移超限楼层设置阻尼器能有效减震的布置策略。首先,根据混联Ⅱ型惯容阻尼器力学构造图及设置方式,建立阻尼器阻尼力与结构节点水平位移的微分型本构关系进而重构耗能体系的地震动方程。其次,利用实模态解耦法获得高层结构简明等效的动力学参数,运用功率谱二次式分解法推导出结构节点相对于地面的绝对位移、竖向构件层间位移及阻尼器阻尼力等响应的功率谱精确二次式解进而推导出耗能体系基于双过滤白噪声激励下系列响应的0～2阶谱矩简明封闭解。最后,通过算例,验证了所提封闭解的正确性;研究了实模态振型数对系列响应谱矩分析精度的影响和阻尼器设置位置对结构减震效果的影响。研究表明：对于多自由度结构响应分析时,建议采用原结构自由振动分析时质量参与系数累计达100%时所对应的振型数,可获得稳定的精度和提高大型复杂结构设置混联Ⅱ型惯容阻尼器的响应的分析效率;通过在原结构层间位移超限楼层或连续多层层间位移超限的楼层中间隔一层设置参数合适的混联Ⅱ型惯容阻尼器可有效降低结构的地震动响应,所提惯容阻尼器设置策略具有较好的经济性。所提解析解和惯容系统在高层结构的设置策略可为混联Ⅱ型惯容阻尼器在实际工程应用中提供有益的参考价值。  相似文献