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The uplifting belt is composed of metasandstone, marble, overlying thick stromatolite (Jinyanshan Group of Jixian System). Metamorphic rocks of 450Ma± occur in both south and north active margin. Post-collision bimodal volcanic rocks and A-type granite occur in the middle and the north side;(4) Apa-Mangya tectonic melange belt consists of ophiolite (including ultramafic rocks, gabbro, plagiogranite and basalt) and flysch and eclogite of late Ordovician.
隆起带为中元古界变砂岩、大理岩,上覆厚层叠层石灰岩,南北边缘有均为450Ma左右的变质岩,中部和北侧分布有碰撞后双峰式火山岩与碱性花岗岩;④阿帕—茫崖构造混杂岩带,由超镁铁质岩、辉长岩、斜长花岗岩、玄武岩等蛇绿岩残片与晚奥陶世复理石沉积和榴辉岩块组成。
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Based on field work in fourteen typical ore districts of China, the author made experiments on contact metasomatism of ultrabasic-acid intrusive rocks with carbonate rocks, interaction between volcanic pneumatolyto-hydrothermal solution and volcanic rocks, and metasomatism in the process of sedimentary metamorphism and migmatizatiun.
本文作者在全国14个典型矿区的野外工作基础上,进行了超基性-酸性侵入岩与碳酸盐岩的接触交代实验;火山气热液与火山岩的相互交代实验;区域沉积变质和混合岩化过程中的交代作用实验。
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The formation process of the rocks is divided for thefirst time into three cycles corresponding to J2, J3, and K1, respectively, and each cycle into early,middle, and late periods based on intruding contact relationship among different types ofgranitoids.3. A detailed study on the petrological characteristics of different cycles of theMesozoic granitoids supports classification of the rocks into three lithological associationsincluding A-type, high-K calc-alkaline, and calc-alkaline granitoids, of which the first associationbelongs to alkaline series, and the others belong to calc-alkaline series. It is shown that thelithologies change from diorite, quartz monzonite, and granodiorite to monzonitic graniteand syenogranite with periods from early to late in each cycle.4. A preliminary summarization hasbeen made on the evolution characteristics of the rocks.
首次将中生代花岗岩类划分为J2旋回、J3旋回、K1旋回等三个旋回,并依据不同岩石类型间的侵入接触关系,将每个旋回又划分为早、中、晚三期。3、在详细研究区内中生代不同时期花岗岩类岩石特征的基础上,首次将区内中生代花岗岩类划分为碱性系列碱质A型花岗岩类以及钙碱性系列高钾钙碱性花岗岩类和钙碱性花岗岩类等二个系列三种岩石组合类型,确定每个旋回从早期到晚期,岩石均具有从闪长岩、花岗闪长岩、石英二长岩-二长花岗岩-正长花岗岩演化的趋势。4、初步总结了区内中生代花岗岩类的演化特征。
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1Arid-subarid palaeoclimate was helpful for mechanical weathering of source rocks and torrent forming;(2) The combination of source rocks and their occurrence were liable to cause mechanical breakdown of rocks and form mudflow,(3)There was a considerable height difference along the border of the basin,(4) The density of subaqueous mudflow was 2.4-2.7g/cm3;(5)There was a high rate of accumulat...
认为本区沙三段时期满足重力流的形成条件,主要表现在六个方面:(1)干旱-半干旱的气候环境有利于母岩的机械风化和山洪的形成;(2)母岩的组合及其产状容易发生机械破碎,形成泥石流;(3)盆地边缘地形高差悬殊;(4)高密度的水下泥石流;(5)堆积速率大;(6)水深位于半深湖以下。
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Pyroclastic rocks are a kind of transitional and complex rocks between lavas and sedimentary rocks.
火山碎屑岩是介于熔岩和沉积岩之间的过渡类型岩石,岩类复杂。
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Sedimentary facies model for mixed sediments of recent reefoid carbonates and siliciclastics is developed from the facies model of fringing and barrier reefs. Based on the sedimentary facies and textures, mixed sediments may be subdivided into 5 types as follows: 1 reef base mixed sedimentary rocks and reef framework mixed sedimentary rocks; 2 reef flat sand-gravel mixed sedimentary rocks; 3 backreef beach-dune gravel-sand mixed sediments; 4 backreef lagoonal sand mixed sediments ; and 5 reef front littoral sand mixed sediments.
礁源与陆源混合沉积相模式是从岸礁一堡礁相模式基础上发展而来,根据其沉积相和沉积结构特徵可以分为5种混合沉积:①礁基混积岩和礁格架混积岩;②礁坪砂砾屑混积岩;③礁后海滩-沙提砾砂屑混合沉积;④礁后泻湖砂屑混合沉积;⑤礁前浅海砂屑混合沉积。
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Through the restoration of the metamorphic rocks, we conclude that the protolith are principally volcanic rocks. The volcanic rocks in the area evolved from the tholeiite series to the calcalkaline series, along with some terrestrial clastics.
通过对变质岩的原岩恢复,得出其原岩主要为火山岩,具有从拉斑玄武岩向钙碱性火山岩演化的特点,局部有陆源碎屑的加入。
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The greenstone belt is a typical volcanic-sedimentary formation formed by metabasic-acid volcanic rocks and partly metasedimentary rocks. The bimodal volcanic rocks are mainly tholeiite, which transforms upward into calc-alkali volcanic rock series.
绿岩带为典型的变质基性-酸性火山岩及部分变质沉积岩系构成的火山-沉积建造,火山岩以拉斑玄武岩为主,向上过渡为钙碱性火山岩系列,表现为双峰态型特点。
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The study of their precise UPb geochronology and characteristics of rock associations shows that (1) small amount of EarlyTriassic (~248 Ma) volcanic rocks were preserved and cropped out in the area, which consist mainly of thin bed of andesitic rocks intercalated with minor basaltic andesites; that (2) the MiddleTriassic magmatism was characterized by extensive felsic igneous rocks with minor basalts interbedded in the middle of volcanic sections in part of areas, and the late MiddleTriassic rhyolites and main body of Lincang granitic batholith have the same extrusive/intrusive time with the age of ~230 Ma; that (3) the LateTriassic volcanic sequences are principally composed of basalts with minor interlayered rhyolites, exhibiting typical characteristics of bimodal volcanics.
三叠纪岩浆作用广泛发育于澜沧江南带,锆石UPb年代学结果及岩石组合特征显示:(1)该区残留有少量的早三叠世火山岩(约248 Ma),主要为一套薄层的以安山岩为主的火山岩;(2)中三叠世以大规模的酸性岩浆作用为主,部分地段的中部夹有少量的玄武岩,其中晚期的流纹岩与该区出露巨大的临沧花岗岩基主体具有一致的形成时代(约230 Ma);(3)晚三叠世则以基性火山岩为主,夹少量流纹岩为特征的&双峰式&火山岩组合。
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This dissertation was focused on the research about the formation and evolution of NQB from the Late Triassic to the early middle Epoch of Jurassic Period, including integrated analyzing the characteristic of the key stratigraphic surfaces, the time of the key stratigraphy, regional rock straigraphy, biostratigraphy and chronostratigraphy, sedimentary system and depositional facies. On basis of these analysis, a tectonic evolution model have been established for NQB during from the Late Triassic to the early middle Epoch of Jurassic Period.1. After the systematic surface analysis about main stratigraphy units, we found that:(1) the bottom of Xiaochaka formation was comformity with the middle Triassic in the basin, and in the north margin it was deposited and overlapped on the different period stratigraphy before Triassic.(2) The top surface of Xiaochaka formation developed regionally karst and paleo-karst breccia, and was uncomformity with Nadigangri Formation, these things suggest that NQB in Xiaochaka depositing stage was developed from middle Triassic basin, and then an extensive regression occurred, the deposition was over and erosion come into being.(3) The lithologic assemblage, geochemistry, mixed fossils, and stratigraphy overlapping characteristic of Quemocuo Formation in early middle Jurassic indicted that the uncomformity surface was an extension-unconformity.2. Integrated analysis about stratigraphy division and correlation indicted that:(1) the paleontologic assemblage of Xiaochaka formation show its time was Carian -Norian stage of late Triassic. According to it was overlapped by late Triassic Nadigangri Formation, so Xiaochaka formation should be Carian - early Norian stage.(2) the SHRIMP Zircon U-Pb age of Nadigangri formation volcanic rocks wear vary form 216 to 205 Ma, so its time should be Norian, but maybe extended into Rhaetian Stage.(3) The age of its bottom volcanic rocks, the fossil assemblages of its middle and upper members and overlapped by lower Jurassic, indicted the age of Riganpeicuo Formation was Norian - Rhaetian stage. And the same time, the volcanic rocks geochemistry of Nadigangri and Riganpeicuo formation both reflected that they wear formed in rift tectonic settings. The lower lithologic and surface characteristic, fossil assemblages and its upper maybe was conformity with lower Jurassic, all reflected that the age of Tumengela Formation in Tumen area should be Norian - Rhaetian stage.
论文对晚三叠世—中侏罗世早期盆地的形成与演化开展了研究,包括关键地层界面特征分析、关键地层时代归属分析、区域岩石地层、生物地层和年代地层的综合对比分析、区域沉积体系与沉积相分析、岩相古地理分析,最终建立晚三叠世—中侏罗世早期羌塘盆沉积—构造动力演化模式。1、系统的对各地层单元的界面分析发现:(1)肖茶卡组底界在盆地内部与中三叠统整合关系,在盆地北缘为沉积超覆于不同时代的前三叠系之上:(2)肖茶卡组顶界面发育古岩溶角砾岩,与上覆那底岗日组为岩溶不整合接触,说明肖茶卡组沉积时期的羌塘盆地是在早中三叠世的盆地基础发展起来的,后期出现了广泛的海退事件,使盆地结束沉积并遭受风化剥蚀作用;(3)中侏罗统雀莫错组的岩性组合特征、岩石化学特征、古生物化石混积和地层的沉积超覆现象均表现出裂陷环境下形成的伸展不整合面的特征。2、综合地层划分与对比分析认为:(1)肖茶卡组古生物化石组合反映其时代为晚三叠世卡尼期—若利期,根据其上被上三叠统那底岗日组不整合覆盖,将其时代厘定为卡尼期—若利期早期;(2)那底岗日组火山岩SHRIMP锆石U-Pb年龄在216~205 Ma之间,其时代主要为若利期,可能包含有瑞替期:(3)日干配错组底部火山岩的年龄、中上部化石组合及其被下侏罗统整合覆盖,综合反映的时代为晚三叠世若利期—瑞替期,而且那底岗日组火山岩和日干配错组火山岩的地球化学成分分析反映两者均为引张构造背景下的产物;土门地区的土门各拉组的下部岩性及界面特征、化石组合和上部可能被下侏罗统整合覆盖,综合反映其时代为若利期—若利期。
- 相关中文对照歌词
- Rocks
- Cleveland Rocks
- Kick Rocks
- Rocks At My Window
- Love On The Rocks With No Ice
- Cold Rock A Party (Remix)
- Red Rocks
- Pop Rocks
- I Still Get Rocks Off
- Miko
- 推荐网络例句
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This is the inheritance of the tribe of the children of Issachar according to their families, the cities and their villages.
19:23 这些城并属城的村庄就是以萨迦支派按着宗族所得的地业。
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I've have enough of your garbage.
我听了你的废话。
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After the website finished, do not lie over to waiting for a guest to fall from the day.
网站做完了以后,别躺在那里等着客人从天而降。